NASA/TMm2000-209891, Vol. 241

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 241

BOREAS TGB-10 Oxidant

Concentration Data over the SSA

Hal Westberg and Brad Hall, Washington State University, Pullman

Andrea V. Jackson, Lancaster University, UK

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000

https://ntrs.nasa.gov/search.jsp?R=20010022512 2018-05-14T15:14:00+00:00Z
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NASA/TMm2000-209891, Vol. 241

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 241

BOREAS TGB-10 Oxidant

Concentration Data over the SSA

Hal Westberg and Brad Hall, Washington State University, Pullman

Andrea V. Jackson, Lancaster University, UK

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000
NASA Center for AeroSpace Information

7121 Standard Drive

Hanover, MD 21076-1320

Price Code: A17

Available from:

National Technical Information Service

5285 Port Royal Road

Springfield, VA 22161

Price Code: A10
BOREAS TGB-10 Oxidant Concentration Data over the SSA

Hal Westberg, Brad Hall, Andrea V. Jackson

Summary

The BOREAS TGB-10 team collected several trace gas data sets in its efforts to determine the role of

biogenic hydrocarbon emissions with respect to boreal forest carbon cycles. This data set contains

measured peroxide (H202 and total organic peroxides (ROOH)) and ozone concentrations as well as

H202 and ROOH deposition velocities. These data were obtained at the SSA-OJP site from May to

September 1994. The data are stored in tabular ASCII files.

Some important results were:

• Ozone concentrations were consistently low, 20-30 ppb, during the summer of 1994.

• Peroxide concentrations showed a seasonal variation with highest concentrations occurring in

July (IFC-2).

• Midday H202 levels averaged around 1.4 ppb during IFC-2 and 0.4-0.5 ppb during IFC's 1

and 3.

• Midday organic peroxide concentrations were lower, averaging 0.8 ppb during IFC-2, and

0.4-0.5 ppb during IFC's 1 and 3.

• The rough pine forest canopy serves as a significant sink for H202.

• Midday H202 deposition velocities averaged 4-7 cm/s.

• Organic peroxide deposition velocities (measured as total ROOH) were approximately 40% as

large as those of H202.

Table of Contents

1) Data Set Overview

2) Investigator(s)

3) Theory of Measurements

4) Equipment

5) Data Acquisition Methods

6) Observations

7) Data Description

8) Data Organization

9) Data Manipulations

10) Errors

11) Notes

12) Application of the Data Set

13) Future Modifications and Plans

14) Software

15) Data Access

16) Output Products and Availability

17) References

18) Glossary of Terms

19) List of Acronyms

20) Document Information

Page 1
1. Data Set Overview

1.1 Data Set Identification

BOREAS TGB-10 Oxidant Concentration Data over the SSA

1.2 Data Set Introduction

The BOReal Ecosystem-Atmosphere Study (BOREAS) Trace Gas Biogeochemistry (TGB)-10

team collected oxidant concentration data at the Southern Study Area (SSA) Old Jack Pine (OJP) site

during the growing season of 1994. Hydrogen peroxide was measured by the dual-channel,

enzyme-catalyzed, fluorometric method using an instrument that was constructed at Washington State

University (WSU). Ozone was measured with a Dasibi 1003-AH ozone sensor.

1.3 Objective/Purpose

Ambient concentrations of biogenic hydrocarbons, hydrogen peroxide, and organic

hydroperoxides were determined. The data were used to examine (a) the role of biogenic hydrocarbon

emissions with respect to carbon cycles in the boreal forest, (b) the chemical fate of boreal biogenic

emissions, (c) the hypothesis that biospheric volatile organic carbon (VOC) emissions contribute to

peroxide formation, and (d) the deposition rates of hydrogen peroxide and organic peroxides.

1.4 Summary of Parameters

The primary parameters are tropospheric concentrations of hydrogen peroxide and organic

hydroperoxides in a boreal forest.

1.5 Discussion

None given.

1.6 Related Data Sets

BOREAS TGB-08 Monoterpene Concentration Data over the SSA

BOREAS TGB-08 Photosynthesis Data over the SSA

BOREAS TGB-08 Starch Data over the SSA

BOREAS TGB-09 Above Canopy Non-Methane Hydrocarbon Data over the SSA

BOREAS TGB- 10 Oxidant Flux Data over the SSA

BOREAS TGB-10 Volatile Organic Carbon Data over the SSA

2. Investigator(s)

2.1 Investigator(s) Name and Title

Dr. Hal Westberg

Washington State University

Dr. Nick Hewitt

Lancaster University

2.2 Title of Investigation

Measurement of Biogenic Hydrocarbon Fluxes

Page 2
2.3 Contact Information

Contact 1: Biogenic Hydrocarbon Emissions

Dr. Hal Westberg

Dept. of Civil and Environmental Engineering

Washington State University

Pullman, WA 99164-2710

(509) 335-1529

(509) 335-7632 (fax)

westberg@mail.wsu.edu

Contact 2: Deposition of Hydrogen Peroxide

Brad Hall

(Dr. Candis Claiborn)

Dept. of Civil and Environmental Engineering

Washington State University

Pullman, WA 99164-2710

(509) 335-5553

(509) 335-7632 (fax)

bhall@lar.ce.wsu.edu

claiborn@wsu.edu

Contact 3: Hydrogen Peroxide and Hydroperoxides

Andrea V. Jackson

(Dr. Nick Hewitt)

Environmental Science Division

Institute of Environmental and Biological Sciences

Lancaster University

Lancaster LA1 4QY

United Kingdom

(44-1524)-843854 (fax)

andrea@lec.leeds.ac.uk

n.hewitt@lancaster.ac.uk

Contact 4:

Jeffrey A. Newcomer

Raytheon ITSS

Code 923

NASA GSFC

Greenbelt, MD 20771

(301) 286-7858

(301) 286-0239 (fax)

Jeffrey.Newcomer@ gsfc.nasa.gov

3. Theory of Measurements

Hydrogen peroxide and organic hydroperoxide measurements were determined by high performance

liquid chromatography (HPLC) with fluorometric detection. Formaldehyde monitoring was performed

by the reaction of formaldehyde with dinitrophenylhydrazine (DNPH).

Page 3
4. Equipment

4.1 Sensor/Instrument Description

Hydrogen peroxide was measured by the dual-channel, enzyme-catalyzed, fluorometric method.

The instrument was constructed at WSU, following the procedure outlined by K&K Instruments;

Boulder, Colorado (Lazrus et al., 1986). Ozone was measured with a Dasibi 1003-AH ozone sensor.

4.1.1 Collection Environment

Tower-based measurements were conducted under ambient atmospheric conditions.

Enclosure-based biogenic VOC measurements were conducted under near-ambient conditions, but at

slightly elevated temperatures.

4.1.2 Source/Platform

All peroxide and ozone measurements were made from ground- or tower-mounted systems.

4.1.3 Source/Platform Mission Objectives

The objective of these experiments was to obtain canopy-scale fluxes of peroxides.

4.1.4 Key Variables

Ambient concentrations of the following trace gases were measured:

• isoprene

• alpha-pinene

• beta-pinene

• limonene

• monoterpenes

• hydrogen peroxide

• methylhydroperoxide

• hydroxymethlyhydroperoxide

• ozone

4.1.5 Principles of Operation

See Section 3.

4.1.6 Sensor/Instrument Measurement Geometry

Enclosure Sampling:

The instruments used for enclosure sampling were mounted on a battery-powered portable cart.

The bag enclosure was mounted on a tripod base, allowing access to branches 1-3 meters from the

ground.

Gradient Sampling:

Inlets were located on beams protruding 1 m off the west sides of the TF towers. With winds

predominately from the south, west, or north, the samples usually contained unperturbed air. The inlet

heights (above the forest floor) are summarized below.

OA 27.5 m and 37.5 m

OBS 12 .4 m and 23.3 m

OJP 16.5 m and 23.8 m IFC-I,

OJP 17 .2 m and 23.8 m IFC-3

IFC-2

The lower inlet at the Old Jack Pine site was raised prior to IFC-3 to alleviate possible influences of the

roughness sublayer.

Page 4
4.1.7 Manufacturer of Sensor/Instrument

HP5890gaschromatograph:

Hewlett Packard

15815 SE 37th St.

Bellevue, WA 98006

Dasibi 1003-AH ozone analyzer:

Dasibi Environmental

616 E. Colorado St.

Glendale, CA 91205

HP-3396A integrator:

Hewlett Packard

15815 SE 37th St.

Bellevue, WA 98006

The hydrogen peroxide system was custom-built at WSU:

WSU Technical Services

Washington State University

Pullman, WA 99164-2801

HPLC system:

Merck Ltd.

Merck House

Poole, Dorset

BH15 1TD, England

Data handling systems:

Labtech

400 Research Dr.

Wilmington, MA 01887

VG Data Systems

St. Georges Court

Hanover Business Park

Altrincham, Cheshire

WA14 5UG England

4.2 Calibration

Formaldehyde

High-purity formaldehyde-hydrazone was prepared by conventional methods for use as a master

standard. The master standard was diluted to concentrations of 0.2, 0.5, 1.0, 2.0, and 5.0 ppm to

establish calibration curves.

Sensors for the peripheral environmental measurements were calibrated at WSU prior to the field

sampling program. Mass flow meters were tested against a precision wet-test meter at several flow

rates. The thermocouples and amplifiers were calibrated against a National Institute for Standards and

Technology (NIST) traceable mercury thermometer by measuring the response with all sensors

immersed in a stirred ice-water bath slowly warmed to approximately 45 deg C. The humidity sensor

was compared to calculated values for air passed through a temperature-controlled water bath. All of

the sensor calibrations were performed using the PC laptop data system employed in the field.

Page 5
Hydrogen Peroxide

The continuous hydroperoxide system was calibrated twice daily with liquid standards of hydrogen

peroxide in deionized water. The standards were prepared at the 10-8 M level by serial dilution of a

30% H202 reagent (Fisher). The concentration of the primary reagent was determined by titration

against KMnO4, which was then titrated against a NIST-traceable sodium oxalate solution.

Line losses through the PFA Teflon tubing were measured before and after each IFC. A gas-phase

H202 generation system was used to produce a sample stream with near-ambient levels of H202. Line

losses were determined by sampling this stream with and without the tower sampling line. A critical

aspect of the peroxide gradient system is the potential for bias introduced in the two separate inlet

sections. Care was taken to ensure that bias introduced by the valve and 4-m inlet sections was

well-known and correctable. Relative bias was determined every few days by placing both inlets at the

same height and sampling ambient air for several hours. Subsequent gradients were corrected for bias,

which ranged from - 1 to 9%. When the bias surpassed 7%, samples were rejected and the valve and

sample lines were cleaned with methanol, deionized water, and peroxide-free air. After cleaning, bias

was reduced to a nondetectable level.

Hydroperoxides

Peak identities were confirmed by comparison with retention times of authentic standards.

Quantification was based on system response to hydrogen peroxide, as the same fluorescent dimer is

formed for all hydroperoxides. Calibration was carried out twice daily and was found to be linear over

the range 8x10 8 M to 5x10 6 M. The limit of detection has been determined to be less than 50 pptv.

Ozone

The Dasibi ozone monitor was calibrated against a Dasibi ozone source/monitor model 1008-PC

(serial #3226).

4.2.1 Specifications

Hydrogen Peroxide

The H202 gradient measurements were occasionally subject to bias. It was extremely difficult to

maintain clean sampling conditions at all times. Inlet filters cannot be used due to the potential for

severe HzO 2 loss on filter surfaces. Periods of unacceptable bias were encountered during the first IFC

when the jack pine trees were pollinating, and occasionally during IFC-2 and IFC-3 when bugs would

collect in the sample lines. The sample lines were sequentially flushed with methanol, water, and dry

air periodically to remove dirt, pollen, and bugs.

Ozone

The source instrument was recently compared to other instruments at the University of Idaho, and

was found to agree within 1-2 ppb.

4.2.1.1 Tolerance

None given.

4.2.2 Frequency of Calibration

Calibrations were performed before and after each IFC. Bias checks for peroxide gradients were

performed every few days during IFC-2 and IFC-3. No bias checks were performed during IFC-1.

4.2.3 Other Calibration Information

None given.

Page 6
5. Data Acquisition Methods

Hydrogen Peroxide and Organic Hydroperoxide

Measurements Air was drawn at 4 L/min from the inlet (24 m height) on the TF tower through 1/4"

TFE Teflon tubing to the tower base, where a gas-phase scrubber was used to scrub peroxides from

the air stream. Samples were collected in 5 mL deionlzed water. HPLC analysis was performed

immediately after sample collection.

HPLC separation was achieved on a Absorbosphere MF Plus C 18 colunm (Altech) with an eluent

of 0.001 M sulfuric acid with 0.0001 M EDTA delivered by a Merck-Hitachi L-6200 Intelligent HPLC

pump at a flow rate of 0.6 mL/min. After separation, the peroxides were derivatized by addition of

0.026 M p-hydroxyphenylacetic acid with 10,000 units/L of horseradish peroxidase (type II Sigmal

Chemical) in 0.5 M potassium hydrogen phthalate buffer at pH 5.8. The reaction of the fluorescence

reagent with the separated hydroperoxides takes place in a Teflon coil to ensure adequate mixing.

Following this, the pH of the resulting solution is raised to above 10 to convert the dimer to its

fluorescent anionic form using a membrane reactor constructed of Nafion (DuPont) tubing immersed in

30% ammonium hydroxide solution. Fluorescence measurements were made using a Merck-Hitachi

spectrophotometer with excitation and emission wavelengths of 310 and 405 nm, respectively. The

HPLC analytical system was located in the instrument hut.

Formaldehyde Monitoring

A DNPH/silica cartridge was connected to the inlet end of a 1/4" stainless steel tube extending to 3

m above the ground. The sample flow (1 L/min) was generated with a small pump and monitored with

a Matheson flow meter. A calibrated Tylan digital totalizer was used to record the total volume

sampled. The cartridges were exposed to the ambient air for nominal durations of 2, 4, or 6 hours.

Cartridges were brought back to WSU for analysis.

Sample and blank cartridges were eluted with 3 mL acetonitrile. Hydrazone concentrations in the

eluent were determined by reverse-phase HPLC. The HPLC analysis was performed using an LKB

modular system consisting of two pumps (LKB #2150), a 190-600 nm ultraviolet/visible wavelength

detector (LKB #2151) operated at 360 nm, and an LC gradient controller (LKB # 2152). A

Brownlee-Rainln 10-cm OD-MPS column (or comparable) with a hydrophobic, nonpolar stationary

phase (bonded on 5-micrometer spheres), preceded by a similar guard column was used for peak

separation. A gradient elution, beginning with a 50:50 water:acetonitrile ratio was used, changing to a

30:70 water:acetonltrile ratio over a period of 21 minutes. The column flow rate was 0.5 mL/min, and

the sample loop volume was 20 microliters.

Signals from the hydrogen peroxide and ozone instruments (TGB-10b) were stored as 1-minute

averages via PC. Data acquisition software from Labtech was used to record signals (voltages). The

gas chromatograph was interfaced to a pair of HP-3396A integrators for peak integration. Raw signals

were also stored via PC for data reprocessing. The HPLC system for hydroperoxides was interfaced

with a VG Data Systems Minlchrom data acquisition system for chromatography. The connection of

the HPLC to the data system was achieved using a chromatography server.

6. Observations

6.1 Data Notes

Hydrogen Peroxide

Periods of unacceptable bias were encountered during the first IFC, when the jack pine trees were

pollinating, and occasionally during IFC-2 and IFC-3, when bugs would collect in the sample lines.

Ozone

Some problems with the electronic zero were detected during IFC- 1. An offset of -6 ppb relative to

the data acquisition system was discovered. This offset was easily measured on a daily basis, and

remained essentially unchanged throughout the experiment.

Page 7
6.2 Field Notes

TGB-10peroxidedataweredeemedquestionable(QC= 2) orunacceptable(QC= 3)duringthe

following periods:

C *** QUALITY CONTROL (based local TIME and DAY)

25-May-1994 QC = 2 poor calibration

26-May-1994 QC = 2 poor calibration

27-May-1994 QC : 2 poor calibration

04-Jui-1994 QC = 3 extreme pollen event

05-Jui-1994 QC = 3 extreme pollen event

06-Jui-1994 QC : 2 moderate pollen event

09-Jui-1995 QC : 2 bias unknown

25-Jui-1994 QC : 2 poor calibration

31-Jui-1994 QC : 3 high noise level

04-Aug-1994 QC : 2 smoke

05-Aug-1994 QC : 2 smoke

06-Aug-1994 QC : 3 rain

01-Sep-1994 QC : 2 lost signal

02-Sep-1994 QC : 3 suspect line loss

7. Data Description

7.1 Spatial Characteristics

7.1.1 Spatial Coverage

Peroxide and ozone concentrations were measured near the OJP tower flux site only. The North

American Datum of 1983 (NAD83) coordinates for the site are:

SSA-OJP: 53.91634N, I04.69203W

7.1.2 Spatial Coverage Map

Not available.

7.1.3 Spatial Resolution

The data are point source measurements at the given locations.

7.1.4 Projection

Not applicable.

7.1.5 Grid Description

Not applicable.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

Measurements were taken at SSA-OJP from 25-May-1994 to 09-Sep-1994.

7.2.2 Temporal Coverage Map

Not available.

Page 8
7.2.3 Temporal Resolution

Peroxide and ozone concentrations were measured continuously during daylight hours. In

addition, many overnight sampling periods were obtained. No regular intervals of data collection were

done at the site; however, data were collected on several days during the growing season of 1994.

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files on the CD-ROM are:

Column Name

SITE NAME

SUB SITE

DATE OBS

TIME OBS

SAMPLE SIZE

HT AGL

MEAN H202 CONC

SDEV H202 CONC

MEAN ROOH CONC

SDEV ROOH CONC

MEAN--O3 CONC

SDEV 03 CONC

QUALITY CODE

CRTFCN CODE

REVISION DATE

7.3.2 Variable Description/Definition

The descriptions of the parameters contained in the data files on the CD-ROM are:

Column Name Description

SITE NAHE

SUB SITE

DATE OBS

TIME OBS

SAMPLE SIZE

HT AGL

HEAN H202 CONC

The identifier assigned to the site by BOREAS, in

the format SSS-TTT-CCCCC, where SSS identifies the

portion of the study area: NSA, SSA, REG, TRN, and

TTT identifies the cover type for the site, 999 if

unknown, and CCCCC is the identifier for site,

exactly what it means will vary with site type.

The identifier assigned to the sub-site by BOREAS,

in the format GGGGG-IIIII, where GGGGG is the

group associated with the sub-site instrument,

e.g. HYD06 or STAFF, and IIIII is the identifier

for sub-site, often this will refer to an

instrument.

The date on which the data were collected.

The Greenwich Mean Time (GMT) when the data were

collected.

The number of one minute sampling periods that

were used to compute the average concentration

(data were stored as 1 min averages of the

continuous signal).

The height above ground at which the measurements

were taken.

The mean hydrogen peroxide concentration.

Page 9
SDEV H202 CONC

MEAN ROOH CONC

SDEV ROOH CONC

MEAN 03 CONC

SDEV 03 CONC

QUALITY CODE

CRTFCN CODE

REVISION DATE

Standard deviation of the peroxide concentration

The mean organic peroxide concentration.

Standard deviation of the organic peroxide

concentration.

The mean ozone concentration.

The standard deviation of the ozone concentration.

l:good data: normal operation, 2:good data: normal

operation, but uncertainties are greater due to

non-ideal sampling condition or equipment

function, 3:data questionable or possible

instrument malfunction

The BOREAS certification level of the data.

Examples are CPI (Checked by PI), CGR (Certified

by Group), PRE (Preliminary), and CPI-??? (CPI but

questionable).

The most recent date when the information in the

referenced data base table record was revised.

7.3.3 Unit of Measurement

The measurement units for the parameters contained in the data files on the CD-ROM are:

Column Name Units

SITE NAME

SUB SITE

DATE OBS

TIME OBS

SAMPLE SIZE

HT AGL

MEAN H202 CONC

SDEV H202 CONC

MEAN ROOH CONC

SDEV ROOH CONC

MEAN 03 CONC

SDEV 03 CONC

QUALITY CODE

CRTFCN CODE

REVISION DATE

[none]

[none]

[DD-MON-YY]

[HHMM GMT]

[unitless]

[meters]

[parts per billion]

[parts per billion]

[parts per billion]

[parts per billion]

[nanomoles O3] [mole air^-l]

[nanomoles O3] [mole air^-l]

[unitless]

[none]

[DD-MON-YY]

7.3.4 Data Source

The sources of the parameter values contained in the data files on the CD-ROM are:

Column Name Data Source

SITE NAME

SUB SITE

DATE OBS

TIME OBS

SAMPLE SIZE

HT AGL

MEAN H202 CONC

SDEV H202 CONC

MEAN ROOH CONC

SDEV ROOH CONC

MEAN--O3 CONC

Not applicable

Not applicable

Investigator

Investigator

Investigator

Investigator

Gas Chromatograph, HPLC

Gas Chromatograph, HPLC]

Gas Chromatograph, HPLC

Gas Chromatograph, HPLC

Gas Chromatograph, HPLC

Page 10
SDEV 03 CONC

QUALITY CODE

CRTFCN CODE

REVISION DATE

Gas Chromatograph, HPLC

Investigator

Not applicable

Not applicable

7.3.5 Data Range

The following table gives information about the p_ameter values found in the data files on the

CD-ROM.

Minimum Maximum Missng Unrel Below Data

Data Data Data Data Detect Not

Column Name Value Value Value Value Limit Cllctd

SITE NAME SSA-OJP-FLXTR SSA-OJP-FLXTR None None None None

SUB SITE TGBI0-CON01 TGBI0-CON01 None None None None

DATE OBS 25-MAY-94 09-SEP-94 None None None None

TIME OBS 0 2358 None None None None

SAMPLE SIZE 0 43 None None None None

HT AGL 3 23 None None None None

MEAN H202 CONC .03 4.21 -999 None None None

SDEV H202 CONC 0 .47 -999 None None None

MEAN ROOH CONC 0 1.57 -999 None None None

SDEV ROOH CONC 0 .35 -999 None None None

MEAN 03 CONC 2 27.6 -999 None None None

SDEV 03 CONC 0 20.7 -999 None None None

QUALITY CODE 1 3 None None None None

CRTFCN CODE CPI CPI None None None None

REVISION DATE 24-OCT-96 24-OCT-96 None None None None

Minimum Data Value -- The minimum value found in the column.

Maximum Data Value -- The maximum value found in the column.

Missng Data Value -- The value that indicates missing data. This is used to

indicate that an attempt was made to determine the

parameter value, but the attempt was unsuccessful.

Unrel Data Value -- The value that indicates unreliable data. This is used

to indicate an attempt was made to determine the

parameter value, but the value was deemed to be

unreliable by the analysis personnel.

Below Detect Limit -- The value that indicates parameter values below the

instruments detection limits. This is used to

indicate that an attempt was made to determine the

parameter value, but the analysis personnel determined

that the parameter value was below the detection

limit of the instrumentation.

Data Not Cllctd -- This value indicates that no attempt was made to

determine the parameter value. This usually

indicates that BORIS combined several similar but

not identical data sets into the same data base table

but this particular science team did not

measure that parameter.

Blank -- Indicates that blank spaces are used to denote that type of value.

N/A -- Indicates that the value is not applicable to the respective column.

None -- Indicates that no values of that sort were found in the column.

Page 11
7.4 Sample Data Record

The following are wrapped versions of data record from a sample data file on the CD-ROM.

SITE NAME,SUB SITE,DATE OBS,TIME OBS,SAMPLE SIZE,HT AGL,MEAN H202 CONC,

SDEV H202 CONC,MEAN ROOH CONC,SDEV ROOH CONC,MEAN 03 CONC,SDEV 03 CONC,

QUALITY CODE,CRTFCN CODE,REVISION DATE

'SSA-OJP-FLXTR', 'TGBI0-CON01',25-MAY-94,546,9,17.0, .56, .02, .39, .01,-999.0,

-999.0,2, 'CPI',24-OCT-96

'SSA-OJP-FLXTR', 'TGBI0-CON01',25-MAY-94,611,15,23.0, .64, .05, .42, .02,-999.0,

-999.0,2, 'CPI',24-OCT-96

'SSA-OJP-FLXTR', 'TGBI0-CON01',25-MAY-94,630,15,17.0, .51, .04, .45, .02,-999.0,

-999.0,2, 'CPI',24-OCT-96

'SSA-OJP-FLXTR', 'TGBI0-CON01',25-MAY-94,650,16,23.0, .61, .04, .42, .01,-999.0,

-999.0,2, 'CPI',24-OCT-96

8. Data Organization

8.1 Data Granularity

The smallest unit of data tracked by the BOREAS Information System (BORIS) was the data

measured on a particular date at a particular site.

8.2 Data Format(s)

The Compact Disk-Read-Only Memory (CD-ROM) files contain American Standard Code for

Information Interchange (ASCII) numerical and character fields of varying length separated by

commas. The character fields are enclosed with single apostrophe marks. There are no spaces between

the fields.

Each data file on the CD-ROM has four header lines of Hyper-Text Markup Language (HTML)

code at the top. When viewed with a Web browser, this code displays header information (data set

title, location, date, acknowledgments, etc.) and a series of HTML links to associated data files and

related data sets. Line 5 of each data file is a list of the column names, and line 6 and following lines

contain the actual data.

9. Data Manipulations

9.1 Formulae

The peroxide gradient was computed from three successive measurements of peroxide

concentration at two levels (10-18 minutes at each level).

Peroxide_gradient = (C2 - 0.5*(Cl+C3))/delta_Z

where: C 1 = concentration measured at lower level (period t)

C2 = concentration measured at upper level (period t+ 1)

C3 = concentration measured at lower level (period t+2)

Special note: If the standard error associated with C1,C2,or C3 was greater than 0.05%,the peroxide

gradient was deemed unacceptable. This procedure was performed in order to screen periods of highly

variable concentration, which might suggest unsteady-state conditions (gusts or large eddies), which

are not conducive to K-theory. This data screening procedure helps eliminate many unrealistic

deposition velocities, but does not affect the overall conclusions.

Peroxide_deposition_velocity = (peroxide_gradient)/(C_avg)*(eddy_diffusivity)

where: C_avg = average peroxide concentration (over both levels)

Page 12
9.1.1 Derivation Techniques and Algorithms

None given.

9.2 Data Processing Sequence

9.2.1 Processing Steps

BORIS staff processed the data by:

• Reviewing the initial data files and loading them online for BOREAS team access.

• Designing relational data base tables to inventory and store the data.

• Loading the data into the relational data base tables.

• Performing the conversions on measurements into System International (SI) units.

• Extracting the standardized data into logical files.

9.2.2 Processing Changes

None.

9.3 Calculations

None.

9.3.1 Special Corrections/Adjustments

Peroxide Bias adjustment: C1 = Cl*fb C3 = Cl*fb

where: fb = bias relative to upper sampling level

(range 0.99 to 1.07 for H202, 0.99 to 1.02 for ROOH)

9.3.2 Calculated Variables

None given.

9.4 Graphs and Plots

None.

10 Errors

10.1 Sources of Error

Hydrogen Peroxide: The following sources of error are those that are not easily identified, and may

affect the data record despite efforts to identify and correct all errors:

• Irregularities in sample line loss (condensation, dirt, bugs).

• Contamination of the switching valve due to bugs, dirt, pollen, etc.

• Irregular signal drift, possibly due to extreme temperature fluctuations.

• Interference due to smoke particles.

Hydroperoxides:

• Fluctuations in air flow rate.

• Error in preparing sample volume.

• Fluctuations in sample collection efficiency with temperature.

• Possible condensation in sample lines.

• Interference due to smoke particles.

• Error associated with the serial dilution of H202 standards.

10.2 Quality Assessment

Page 13
10.2.1 Data Validation by Source

None given.

10.2.2 Confidence Level/Accuracy Judgment

Hydrogen peroxide concentrations are good to approximately 30%. Total organic peroxide

concentrations have not been corrected for collection efficiency. Reported total organic peroxide

concentration may be underestimated by as much as 60%. Individual deposition velocity measurements

are subject to 50-80% uncertainty due to uncertainties in the measured gradient, the measured eddy

diffusivity, and the natural variability of a turbulent atmosphere. Ozone concentrations are good to +/-

5 ppb for IFC-l, and +/- 3 ppb for IFC-2 and IFC-3.

10.2.3 Measurement Error for Parameters

None given.

10.2.4 Additional Quality Assessments

None.

10.2.5 Data Verification by Data Center

Data were examined for general consistency and clarity.

11.1 Limitations of the Data

None given.

11.2 Known Problems with the Data

None given.

11.3 Usage Guidance

None given.

11.4 Other Relevant Information

None given.

11. Notes

12. Application of the Data Set

The data can be used to examine (a) the role of biogenic hydrocarbon emissions with respect to carbon

cycles in the boreal forest, (b) the chemical fate of boreal biogenic emissions, (c) the hypothesis that

biospheric volatile organic carbon (VOC) emissions contribute to peroxide formation, and (d) the

deposition rates of hydrogen peroxide and organic peroxides.

None.

13. Future Modifications and Plans

Page 14
14. Software

14.1 Software Description

All software programs used to gather data were off-the-shelf, standard scientific packages.

14.2 Software Access

None given.

15. Data Access

The TGB-10 oxidant concentration data are available from the Earth Observing System Data and

Information System (EOSDIS) Oak Ridge National Laboratory (ORNL) Distributed Active Archive

Center (DAAC).

15.1 Contact Information

For BOREAS data and documentation please contact:

ORNL DAAC User Services

Oak Ridge National Laboratory

P.O. Box 2008 MS-6407

Oak Ridge, TN 37831-6407

Phone: (423) 241-3952

Fax: (423) 574-4665

E-mail: ornldaac@ornl.gov or ornl@eos.nasa.gov

15.2 Data Center Identification

Earth Observing System Data and Information System (EOSDIS) Oak Ridge National Laboratory

(ORNL) Distributed Active Archive Center (DAAC) for Biogeochemical Dynamics

http://www-eosdis.ornl.gov/.

15.3 Procedures for Obtaining Data

Users may obtain data directly through the ORNL DAAC online search and order system

[http://www-eosdis.ornl.gov/] and the anonymous FTP site [ftp://www-eosdis.ornl.gov/data/] or by

contacting User Services by electronic mail, telephone, fax, letter, or personal visit using the contact

information in Section 15.1.

15.4 Data Center Status/Plans

The ORNL DAAC is the primary source for BOREAS field measurement, image, GIS, and

hardcopy data products. The BOREAS CD-ROM and data referenced or listed in inventories on the

CD-ROM are available from the ORNL DAAC.

16. Output Products and Availability

16.1 Tape Products

None.

16.2 Film Products

None.

16.3 Other Products

These data are available on the BOREAS CD-ROM series.

Page 15
17. References

17.1 Platform/Sensor/Instrument/Data Processing Documentation

None given.

17.2 Journal Articles and Study Reports

Guenther, A. et al. 1996. Isoprene fluxes measured by enclosure, relaxed eddy accumulation, surface

layer gradient, mixed layer gradient, and mixed layer mass balance techniques. Journal of Geophysical

Research, 101, 18,555-18,567.

Hall, B.D. and C.S. Claiborn. 1997. Measurements of the dry deposition of peroxides to a Canadian

boreal forest. Journal of Geophysical Research 102(D24):29,343-29,353.

Lazrus, A.L, G.L. Kok, S.N. Gitlin, J.A. Lind, B.G. Heikes, and R.E. Shetter. 1986. Automated

fluorometric method for hydrogen peroxide in air. Anal. Chem. 58, 594-597.

Kok, G.L., S.E. McLaren, and T.A. Staffelbach. 1995. HPLC determination of atmospheric organic

hydroperoxides. J. Atmos. Ocean Tech., 12, 282-289.

Newcomer, J., D. Landis, S. Conrad, S. Curd, K. Huemmrich, D. Knapp, A. Morrell, J. Nickeson,

A. Papagno, D. Rinker, R. Strub, T. Twine, F. Hall, and P. Sellers, eds. 2000. Collected Data of The

Boreal Ecosystem-Atmosphere Study. NASA. CD-ROM.

Sellers, P. and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1994-3.0, NASA BOREAS Report (EXPLAN 94).

Sellers, P. and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version

1996-2.0, NASA BOREAS Report (EXPLAN 96).

Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere Study: 1994

Operations. NASA BOREAS Report (OPS DOC 94).

Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere Study: 1996

Operations. NASA BOREAS Report (OPS DOC 96).

Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B.

Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal

ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year.

Bulletin of the American Meteorological Society. 76(9): 1549-1577.

Sellers, P.J., F.G. Hall, R.D. Kelly, A. Black, D. Baldocchi, J. Berry, M. Ryan, K.J. Ranson, P.M.

Crill, D.P. Lettenmaier, H. Margolis, J. Cihlar, J. Newcomer, D. Fitzjarrald, P.G. Jarvis, S.T.

Gower, D. Halliwell, D. Williams, B. Goodison, D.E. Wickland, and F.E. Guertin. 1997. BOREAS

in 1997: Experiment Overview, Scientific Results and Future Directions. Journal of Geophysical

Research 102(D24): 28,731-28,770.

17.3 Arehive/DBMS Usage Documentation

None.

None.

18. Glossary of Terms

Page 16
ASCII

BOREAS

BORIS

CD-ROM

DAAC

DNPH

EOS

EOSDIS

GIS

GMT

GSFC

HPLC

HTML

IFC

NAD83

NASA

NIST

NMHC

NSA

OA

OBS

OJP

ORNL

PANP

REA

SI

SSA

TF

TGB

URL

VOC

WSU

19. List of Acronyms

- American Standard Code for Information Interchange

- BOReal Ecosystem-Atmosphere Study

- BOREAS Information System

- Compact Disk-Read-Only Memory

- Distributed Active Archive Center

- dinitrophenylhydrazine

- Earth Observing System

- EOS Data and Information System

- Geographic Information System

- Greenwich Mean Time

- Goddard Space Flight Center

- High Performance Liquid Chromatography

- Hyper-Text Markup Language

- Intensive Field Campaign

- North American Datum of 1983

- National Aeronautics and Space Administration

- National Institute for Standards and Technology

- Non-Methane Hydrocarbon

- Northern Study Area

- Old Aspen

- Old Black Spruce

- Old Jack Pine

- Oak Ridge National Laboratory

- Prince Albert National Park

- Relaxed Eddy Accumulation

- System International

- Southern Study Area

- Tower Flux

- Trace Gas Biogeochemistry

- Uniform Resource Locator

- Volatile Organic Compound (or Carbon)

- Washington State University

20. Document Information

20.1 Document Revision Dates

Written: 17-Nov- 1994

Last Updated: 16-Jul- 1999

20.2 Document Review Dates

BORIS Review: 12-Jun-1998

Science Review:

20.3 Document ID

20.4 Citation

When using these data, please contact the personnel listed in Section 2.3 and cite any relevant

papers in Section 17.2:

Page 17
If usingdatafromtheBOREASCD-ROM series,alsoreferencethedataas:

Westberg,H. andN. Hewitt, "Measurementof BiogenicHydrocarbonFluxes."In CollectedData

of TheBorealEcosystem-AtmosphereStudy.Eds.J.Newcomer,D. Landis,S.Conrad,S.Curd,K.

Huemmrich,D. Knapp,A. Morrell, J.Nickeson,A. Papagno,D. Rinker, R.Strub,T. Twine, F.

Hall, andP.Sellers.CD-ROM.NASA, 2000.

Also,citetheBOREASCD-ROMsetas:

Newcomer,J.,D. Landis,S.Conrad,S.Curd,K. Huemmrich,D. Knapp,A. Morrell, J.

Nickeson,A. Papagno,D. Rinker,R.Strub,T. Twine,F. Hall, andP.Sellers,eds.CollectedDataof

TheBorealEcosystem-AtmosphereStudy.NASA. CD-ROM.NASA, 2000.

20.5 Document Curator

20.6 Document URL

Page 18
REPORT DOCUMENTATION PAGE FormApproved

OMB No. 0704-0188

Public reporting burden for this collection of informationis estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources,

gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this

collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson

Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

November 2000 Technical Memorandum

4. TITLE AND SUBTITLE

Technical Report Series on the Boreal Ecosystem-Atmosphere Study (BOREAS)

BOREAS TGB-10 Oxidant Concentration Data over the SSA

6. AUTHOR(S)

Hal Westberg, Brad Hall, and Andrea V. Jackson

Forrest G. Hall and Sara K. Conrad, Editors

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS (ES)

Goddard Space Flight Center

Greenbelt, Maryland 20771

9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS (ES)

National Aeronautics and Space Administration

Washington, DC 20546-0001

5. FUNDING NUMBERS

923

RTOP: 923-462-33-01

8. PEFORMING ORGANIZATION

REPORT NUMBER

2000-03136-0

10. SPONSORING / MONITORING

AGENCY REPORT NUMBER

TM--2000-209891

Vol. 241

11. SUPPLEMENTARY NOTES

H. Westberg and B. Hall: Washington State University, Pullman; A.V. Jackson: Lancaster University,

UK; S.K. Conrad: Raytheon ITSS

12a. DISTRIBUTION / AVAILABILITY STATEMENT

Unclassifie_Unlimited

Subject Category: 43

Report available from the NASA Center for AeroSpace Information,

7121 Standard Drive, Hanover, MD 21076-1320. (301) 621-0390.

12b. DISTRIBUTION CODE

13. ABSTRACT (Maximum 200 words)

The BOREAS TGB-10 team collected several trace gas data sets in its efforts to determine the role of biogenic

hydrocarbon emissions with respect to boreal forest carbon cycles. This data set contains measured peroxide

(H202 and total organic peroxides (ROOH)) and ozone concentrations as well as H202 and ROOH deposition

velocities. These data were obtained at the SSA-OJP site from May to September 1994. The data are stored in

tabular ASCII files. Some important results were:

• Ozone concentrations were consistently low, 20-30 ppb, during the summer of 1994.

• Peroxide concentrations showed a seasonal variation with highest concentrations occurring in

July (IFC-2).

• Midday H202 levels averaged around 1.4 ppb during IFC-2 and 0.4-0.5 ppb during IFC's 1 and 3.

• Midday organic peroxide concentrations were lower, averaging 0.8 ppb during IFC-2, and 0.4-

0.5 ppb during IFC's 1 and 3.

• The rough pine forest canopy serves as a significant sink for H202.

• Midday H202 deposition velocities averaged 4-7 cirds.

• Organic peroxide deposition velocities (measured as total ROOH) were approximately 40% as

large as those of H202.

14. SUBJECT TERMS

BOREAS, trace gas biogeochemistry.

17. SECURITY CLASSIFICATION

OF REPORT

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Unclassified

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Unclassified

15. NUMBER OF PAGES

18

16. PRICE CODE

20. LIMITATION OF ABSTRACT

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