NASA/TMm2000-209891, Vol. 221

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 221

BOREAS TGB-1 NSA SF 6

Chamber Flux Data

Patrick Crill and Ruth K. Varner

University of New Hampshire, Durham

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000

https://ntrs.nasa.gov/search.jsp?R=20010022797 2018-05-14T19:00:49+00:00Z
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NASA/TMm2000-209891, Vol. 221

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 221

BOREAS TGB-1 NSA SF 6

Chamber Flux Data

Patrick Crill and Ruth K. Varner

University of New Hampshire, Durham

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-1 NSA SF 6 Chamber Flux Data

Patrick M. Crill, Ruth K. Varner

Summary

The BOREAS TGB-1 team made several chamber and tower measurements of trace gases at sites in

the BOREAS NSA. This data set contains sulfur hexafluoride (SF6) dark chamber flux measurements

at the NSA-OJP and NSA-YJP sites from 16-May through 13-Sep-1994. Gas samples were extracted

approximately every 7 days from dark chambers and analyzed at the NSA lab facility. The data are

provided in tabular ASCII files.

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

1. Data Set Overview

1.1 Data Set Identification

BOREAS TGB-01 NSA SF6 Chamber Flux Data

1.2 Data Set Introduction

Chamber flux measurements were taken at the BOReal Ecosystem Atmosphere Study (BOREAS)

Northern Study Area (NSA) Old Jack Pine (OJP) and Young Jack Pine (YJP) sites during the summer

of 1994. The purpose of these measurements was to examine the trace gas exchange between the

atmosphere and the boreal soils. The following is a description of the acquisition of data and the final

data sets.

1.3 Objective/Purpose

Chamber fluxes were measured at the OJP and YJP sites in the NSA to determine the soil surface

exchange rates of SF 6.

Page 1
1.4 Summary of Parameters

SF6 chamber fluxes were measured at the NSA OJP and YJP sites. Temperatures of the chamber,

1-cm soil depth, and 10-cm soil depth were recorded at the OJP and YJP sites.

1.5 Discussion

The chamber flux data included in SF6 flux.txt includes the SF6 tracer study that was completed at

the OJP and YJP aluminum chamber and collar sites.

1.6 Related Data Sets

BOREAS TGB-01 Soil CH4 and CO2 Profile Data from NSA Tower Sites

BOREAS TGB-01 NSA CH4 and CO2 Chamber Flux Data

BOREAS TGB-01 CH4 Concentration and Flux Data from NSA Tower Sites

BOREAS TGB-03 CH4 and CO2 Chamber Flux Data over NSA Upland Sites

BOREAS TGB-03 Dissolved Organic Carbon Data from the NSA

2. Investigator(s)

2.1 Investigator(s) Name and Title

Dr. Patrick M. Crill

Research Associate Professor

University of New Hampshire

2.2 Title of Investigation

Magnitude and Control of Trace Gas Exchange in Boreal Ecosystems

2.3 Contact Information

Contact 1:

Dr. Patrick M. Crill

Institute for the Study of Earth, Oceans, and Space

Complex Systems Research Center

University of New Hampshire

Durham, NH 03824

(603) 862-3519

(603) 862-0188 (fax)

Contact 2:

Sadredin C. Moosavi

Graduate Student

Institute for the Study of Earth, Oceans, and Space

Complex Systems Research Center

University of New Hampshire

Durham, NH 03824

(603) 862-2927

(603) 862-0188 (fax)

Page 2
Contact 3:

RuthK. Varner

ResearchScientist

Institutefor theStudyof Earth,Oceans,andSpace

ComplexSystemsResearchCenter

Universityof New Hampshire

Durham,NH 03824

(603)862-2939

(603)862-0188(fax)

Contact 4:

JeffreyA. Newcomer

RaytheonITSS

Code923

NASA GSFC

Greenbelt,MD 20771

(301)286-7858

(301)286-0239(fax)

Jeffrey.Newcomer@gsfc.nasa.gov

Nonegiven.

3. Theory of Measurements

4. Equipment

4.1 Sensor/Instrument Description

SF6 was quantified using a Shimadzu GC-8A Gas Chromatograph (GC) equipped with an electron

capture detector (ECD). The oven temperature during sample analysis was run at 130 °C and the

detector at 300 °C. Ultra-high-purity 5% CH4/95% Argon carrier gas was used at a flow rate through

the columns of 30 mL/min. Analog signals (0-1 V) from the detectors were digitized at 10 Hz with a

Hewlett Packard (HP) 35000D A/D board and quantified and logged using HP ChemStation software.

Chamber fluxes were accomplished with aluminum chambers manufactured at the University of New

Hampshire and designed by Patrick Crill.

4.1.1 Collection Environment

The chamber fluxes were collected under ambient conditions. The GC analysis was completed at

the Hayes Road Lab in Thompson, Manitoba.

4.1.2 Source/Platform

Ground.

4.1.3 Source/Platform Mission Objectives

The mission objective was to determine the diffusion rate of SF6 at OJP and YJP.

4.1.4 Key Variables

The key variables measured during the fluxes were SF6 diffusion rate and temperature.

Page 3
4.1.5 Principles of Operation

SF6 was quantified using a Shimadzu GC8A equipped with an ECD. When the carrier gas,

CH4-Ar, flows into a cell containing 63Ni, it is ionized by the radiation from this radioisotope. When a

pulsed voltage is applied across the cell electrodes, an ion current flows.

When the carrier gas brings a sample into contact with the cell, the electron affinitive compounds in

the sample capture the free electrons and become negative ions. These negative ions combine with

positive ions in the flow and subsequently decrease the ion concentration and therefore the current.

This change is measured by the detector and compared to a reference current, pure carrier gas

(Instruction Manual: GC-8A, Shimadzu Corporation, Kyoto, Japan).

4.1.6 Sensor/Instrument Measurement Geometry

Not applicable.

4.1.7 Manufacturer of Sensor/Instrument

Manufacturer of GC-14A FID/TCD, GC-MINI2, and GC-8A ECD

Shimadzu Scientific Instruments, Inc.

7102 Riverwood Drive

Columbia, MD 21046

(410) 381-1227

4.2 Calibration

Signal peaks from the detectors were quantified with working standards calibrated against

Canadian Atmospheric Environment Services (AES) certified primary standards acquired by the

BOREAS project. Uncertainty in the standards' analyses on a given day ranged from 0.1 to 0.2%.

4.2.1 Specifications

Not applicable.

4.2.1.1 Tolerance

The sensitivity of the ECD is 0.2 pg for gamma BHC.

4.2.2 Frequency of Calibration

The instrument is calibrated on a daily basis. Standards are run generally before and after samples

on a given day of analysis.

4.2.3 Other Calibration Information

Not applicable.

5. Data Acquisition Methods

The chamber fluxes are determined by analysis of concentration of SF 6 in a time series of grab samples

of headspace over the ground surface enclosed by a dark aluminum chamber. At time zero, 5 mL of

SF6 stock was added to the chamber headspace. The stock mixture is 10 ]aL SF6 diluted into 60 ml of

air so the mixing ratio is approximately 167 ppmv SF6. The headspace concentration is equal to about

12 ppbv after the injection of the stock. The volume of the two aluminum chambers was 0.071 and

0.120 m3 over an area of 0.397 m2. The aluminum chamber was placed on the trough of an aluminum

collar embedded in the ground. Water was added to the trough of the collar to create an airtight seal.

The volume of the plastic chambers was 0.028 m3 over an area of 0.078 m2. The seal between the

chamber and collar was made using weather stripping or water as appropriate. Five 60-mL samples

were removed from the headspace with polypropylene syringes and polycarbonate/nylon stopcocks at

4-minute intervals for 20 minutes (five samples). Samples were returned to the Hayes Road lab and

analyzed for SF6 using gas chromatography within 12 hours after collection.

Page 4
6.1 Data Notes

Nonegiven.

6.2 Field Notes

None given.

6. Observations

7. Data Description

7.1 Spatial Characteristics

Not applicable.

7.1.1 Spatial Coverage

The North American Datum of 1983 (NAD83) coordinates of the sites are:

NSA OJP: (55.92842 ° N, 98.62396 ° W)

NSA YJP: (55.89575 ° N, 98.28706 ° W)

7.1.2 Spatial Coverage Map

Not applicable.

7.1.3 Spatial Resolution

These are point source measurements.

7.1.4 Projection

Not applicable.

7.1.5 Grid Description

Not applicable.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

The chamber fluxes were taken approximately every 7 days from 16-May-1994 through

13-Sep- 1994.

7.2.2 Temporal Coverage Map

Not applicable.

7.2.3 Temporal Resolution

Not applicable.

7.3 Data Characteristics

Page 5
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

COLLAR ID

CHAMBER TEMP

SF6 RATE

COVER TYPE

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 NAME

SUB SITE

DATE OBS

COLLAR ID

CHAMBER TEMP

SF6 RATE

COVER TYPE

CRTFCN CODE

REVISION DATE

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, or

TRN; TTT identifies the cover type for the

site (999 if unknown); and CCCCC is the

identifier for the site (exactly what it means

will vary with site type).

The identifier assigned to the subsite by BOREAS,

in the format GGGGG-IIIII, where GGGGG is the

group associated with the subsite instrument

(e.g. HYD06 or STAFF), and IIIII is the

identifier for the subsite (often this will refer

to an instrument).

The date on which the data were collected.

A Trace Gas Biogeochemistry (TGB) 01 designation

for the chamber collar sites, in the form of ABBB-##, where A = C or M (Crill or Moosavi), BBB

denotes the site, and possibly microtopographic

designation, and ## is a sequention collar

number.

Temperature of the chamber used to determine the

SF6 flux.

The SF6 diffusion rate (K) .

The dominant species, vegetation or type of land

cover that exists at the location.

The BOREAS certification level of the data.

Examples are Checked by PI (CPI), Certified by

Group (CGR), Preliminary (PRE), and CPI but

but questionable (CPI-???) .

The most recent date that the information in the

referenced data base table record was revised.

Page 6
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 [none]

SUB SITE [none]

DATE OBS [DD-MON-YY]

COLLAR ID [none]

CHAMBER TEMP [degrees Celsius]

SF6 RATE [minute-l]

COVER TYPE [none]

CRTFCN CODE [none]

REVISION DATE [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 Not applicable

SUB SITE Not applicable

DATE OBS Investigator

COLLAR ID Investigator

CHAMBER TEMP Thermometer

SF6 RATE Shimadzu GC8A

COVER TYPE Investigator

CRTFCN CODE Not applicable

REVISION DATE Not applicable

7.3.5 Data Range

The following table gives information about the parameter 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 NSA-OJP-FLXTR NSA-YJP-FLXTR None None None None

SUB SITE TGB01-FLX01 TGB01-FLX01 None None None None

DATE OBS 30-JUL-94 10-SEP-94 None None None None

COLLAR ID C-OJP-ua-01 C-YJP-ul-04 None None None None

CHAMBER TEMP 9.6 27.5 None None None None

SF6 RATE -0.1589 -0.0034 None None None None

COVER TYPE N/A N/A None None None None

CRTFCN CODE CPI CPI None None None None

REVISION DATE 02-JAN-97 02-JAN-97 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 that an attempt was made to determine the

Page 7
Below Detect Limit

Data Not Cllctd

parameter value, but the analysis personnel deemed the

value to be unreliable.

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.

This value indicates that no attempt was made to

determine the parameter value. This usually

indicates that BOREAS Information System (BORIS) staff

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.

7.4 Sample Data Record

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

SITE NAME,SUB SITE,DATE OBS,COLLAR ID,CHAMBER TEMP,SF6 RATE,COVER TYPE,

CRTFCN CODE,REVISION DATE

'NSA-OJP-FLXTR', 'TGBOI-FLXOI',30-JUL-94, 'C-OJP-uI-02',24.4,-.OI63, 'Lichen', 'CPI',

02-JAN-97

'NSA-OJP-FLXTR', 'TGBOI-FLXOI',OI-SEP-94, 'C-OJP-uI-03',22,-.067, 'Lichen', 'CPI',

02-JAN-97

'NSA-OJP-FLXTR', 'TGBOI-FLXOI',O3-SEP-94, 'C-OJP-uI-03',I9,-.OI82, 'Lichen', 'CPI',

02-JAN-97

8. Data Organization

8.1 Data Granularity

The smallest unit of data tracked by BORIS is the measurement(s) made for a given site on a given

day.

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.

Page 8
9.1 Formulae

9. Data Manipulations

Rf = Cstd/Astd

Cs = Rf * As

Where: Rf = Response factor

Astd = Average of 10 standard peak areas

Cstd = Concentration of the standard

Cs = Concentration of the sample

As = Peak area of sample

SF 6 concentrations were calculated from the average of 10 peak areas of known SF 6 standards. The

response factor was calculated as the concentration of the known standard divided by the average of 10

standard peak areas. The peak area of the unknown sample was multiplied by the response factor.

The SF 6 rate (K) value was calculated by fitting a linear regression to the in (natural logarithm) of

the concentrations of SF6 versus time. The regressions of the time series were expected to have an r2

of greater than 0.85.

If -888 is present in the data set, it indicates that a measurement was taken but discarded for some

reason. If -999 is present, then no data were taken.

9.1.1 Derivation Techniques and Algorithms

The K value measured for SF6 is used to determine the rate of diffusion of CH4 and CO2 to the

soil surface. The relationship can be seen from the following equation:

DSF6/((mSF6)I/2) = Di/((mi)l/2) (Trumbore, 1995, and Rolston, 1991)

where: DSF6 = measured diffusion of SF6

mSF6> = molecular weight of SF6 (146 g/mol)

Di = unknown diffusion of substance i (CI-I4 or CO2)

mi = molecular weight of substance i (CH4 = 16 g/mol; CO2 = 44 g/mol)

From this information, given a known starting concentration of C02 and CH4, one can calculate the

diffusive flux to the surface:

Di * dCi/dz = Fd (Trumbore, 1995)

Where: DCi/dz = soil profile of gas i

Fd = diffusive flux

See Rolston (1991) and Trumbore (1995) for more detailed explanation of the methods and theory.

9.2 Data Processing Sequence

9.2.1 Processing Steps

None given.

9.2.2 Processing Changes

None.

Page 9
9.3 Calculations

Not applicable.

9.3.1 Special Corrections/Adjustments

Not applicable.

9.3.2 Calculated Variables

Not applicable.

9.4 Graphs and Plots

None.

10. Errors

10.1 Sources of Error

The analytical precision of the GCs is 0.2% for CH4 and 1% for CO2.

10.2 Quality Assessment

10.2.1 Data Validation by Source

None given.

10.2.2 Confidence Level/Accuracy Judgment

None given.

10.2.3 Measurement Error for Parameters

The analytical precision of the GCs is 0.2% for CH4 and 1% for CO2.

10.2.4 Additional Quality Assessments

None given.

10.2.5 Data Verification by Data Center

Data were examined for general consistency and clarity.

11. Notes

11.1 Limitations of the Data

The analytical precision of the GCs is 0.2% for CH4 and 1% for CO2.

11.2 Known Problems with the Data

None given.

11.3 Usage Guidance

None given.

11.4 Other Relevant Information

Not applicable.

Page 10
Nonegiven.

12. Application of the Data Set

13. Future Modifications and Plans

This data set is in its final format.

14.1 Software Description

Not applicable.

14.2 Software Access

Not applicable.

14. Software

15. Data Access

The TGB-01 NSA SF6 chamber flux 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.

Page 11
16.1 Tape Products

None.

16. Output Products and Availability

16.2 Film products

None.

16.3 Other Products

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

17. References

17.1 Platform/Sensor/Instrument/Data Processing Documentation

None.

17.2 Journal Articles and Study Reports

Bubier, J.L., T.R. Moore, L. Bellisario, N.T. Comer, and P.M. Crill. 1995. Ecological controls on

methane emissions from a northern peafland complex in the zone of discontinuous permafrost.

Manitoba, Canada. Global Biogeochemical Cycles 9: 455-470.

Crill, P.M., K.B. Bartlett, R.C. Harriss, E. Gorham, E.S. Verry, D.I. Sebacher, L. Madzer, and W.

Sanner. 1988. Methane flux from Minnesota peatlands. Global Biogeochemical Cycles, 2, 371-384.

Daubenmire, R.F. 1968. Plant communities: a textbook of plant synecology. Harper and Row, New

York, NY.

Moore, T.R. and N.T. Roulet. 1991. A comparison of dynamic and static chambers for methane

emission measurements from subarctic fens. Atmosphere-Ocean, 29, 102-109.

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.

Rolston, D.E., R.D. Glauz, G.L. Grundman, and D.T. Louie. 1991. Evaluation of an in situ method

for measurement of gas diffusivity in surface soils. Soil Science Society of America Journal, 55,

1536-1542.

Roulet, N., S. Hardill, and N. Comer. 1991. Continuous measurement of the depth of water table

(inundation) in wetlands with fluctuating surfaces. Hydrological Processes, 5, 399-403.

Roulet, N.T. 1991. Surface level and water table fluctuations in a subarctic fen. Arctic and Alpine

Research, 23,303-310.

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).

Page 12
Sellers,P.,F. Hall, andK.F. Huemmrich.1997.BorealEcosystem-AtmosphereStudy:1996

Operations.NASA BOREASReport(OPSDOC96).

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

Goodison,P.Crill, K.J.RansomD. Lettenmaier,andD.E. Wickland. 1995.Theboreal

ecosystem-atmospherestudy(BOREAS):anoverviewandearlyresultsfrom the1994field year.

Bulletinof theAmericanMeteorologicalSociety.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, andF.E.Guertin.1997.BOREAS

in 1997:ExperimentOverview,ScientificResultsandFutureDirections.Journalof Geophysical

Research102(D24):28,731-28,770.

Sjors,H. 1950.Ontherelationbetweenvegetationandelectrolytesin Swedishmirewaters.Oikos,2,

241-258.

Trumbore,S.E.1995.Useof isotopesandtracersin thestudyof emissionsandconsumptionof trace

gasesin terrestrialenvironments.In: BiogenicTraceGases:MeasuringEmissionsfromSoil and

Water,editedby P.A.Matson,andR.C.Harriss,pp.291-326,Blackwell,Oxford.

17.3 Archive/DBMS Usage Documentation

None.

None.

18. Glossary of Terms

AES

ASCII

BOREAS

BORIS

BP

CD-ROM

CMDL

DAAC

ECD

EOS

EOSDIS

FID

GC

GIS

GSFC

HTML

NAD83

NASA

NSA

OBS

OJP

ORNL

19. List of Acronyms

- Atmospheric Environment Services

- American Standard Code for Information Interchange

- BOReal Ecosystem-Atmosphere Study

- BOREAS Information System

- Beaver Pond

- Compact Disk-Read-Only Memory

- Climate Monitoring and Diagnostics Laboratory

- Distributed Active Archive Center

- Electron Capture Detector

- Earth Observing System

- EOS Data and Information System

- Flame Ionization Detector

- Gas Chromatograph

- Geographic Information System

- Goddard Space Flight Center

- HyperText Markup Language

- North American Datum of 1983

- National Aeronautics and Space Administration

- Northern Study Area

- Old Black Spruce

- Old Jack Pine

- Oak Ridge National Laboratory

Page 13
PANP

SSA

TCD

TGB

URL

YJP

- Prince Albert National Park

- Southern Study Area

- Thermal Conductivity Detector

- Trace Gas Biogeochemistry

- Uniform Resource Locator

- Young Jack Pine

20. Document Information

20.1 Document Revision Date

Written:

Last Updated: 08-Jun- 1999

20.2 Document Review Date(s)

BORIS Review: 04-Mar- 1998

Science Review: 08-May- 1998

20.3 Document ID

20.4 Citation

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

papers in Section 17.2.

If using data from the BOREAS CD-ROM series, also reference the data as:

Crill, P.M., "Magnitude and Control of Trace Gas Exchange in Boreal Ecosystems." In Collected

Data of The Boreal Ecosystem-Atmosphere Study. 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, and P. Sellers. CD-ROM. NASA, 2000.

Also, cite the BOREAS CD-ROM set as:

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. Collected Data of

The Boreal Ecosystem-Atmosphere Study. NASA. CD-ROM. NASA, 2000.

20.5 Document Curator

20.6 Document URL

Page 14
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- 1 NSA SF 6Chamber Flux Data

6. AUTHOR(S)

Patrick Crill and Ruth K. Vamer

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. 221

11. SUPPLEMENTARY NOTES

P. Crill and R.K. Varner: University of New Hampshire, Durham;

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-1 team made several chamber and tower measurements of trace gases at sites in

the BOREAS NSA. This data set contains sulfur hexafluoride (SF6) dark chamber flux measurements

at the NSA-OJP and NSA-YJP sites from 16-May through 13-Sep-1994. Gas samples were extracted

approximately every 7 days from dark chambers and analyzed at the NSA lab facility. The data are

provided in tabular ASCII files.

14. SUBJECT TERMS

BOREAS, trace gas biogeochemistry.

17. SECURITY CLASSIFICATION

OF REPORT

Unclassified

NSN 7540-01-280-5500

18. SECURITY CLASSIFICATION

OF THIS PAGE

Unclassified

19. SECURITY CLASSIFICATION

OF ABSTRACT

Unclassified

15. NUMBER OF PAGES

14

16. PRICE CODE

20. LIMITATION OF ABSTRACT

UL

Standard Form 298 (Rev. 2-89)

Prescribed by ANSI Std. Z39.18

298-102