NASA/TMm2000-209891, Vol. 238

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 238

BOREAS TGB-8 Photosynthetic Rate Data

over the SSA-OBS and the SSA-OJP

Manuel Lerdau

State University of New York, Stony Brook

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000

https://ntrs.nasa.gov/search.jsp?R=20010022516 2018-05-14T15:09:23+00:00Z
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NASA/TMm2000-209891, Vol. 238

Technical Report Series on the

Boreal Ecosystem-Atmosphere Study (BOREAS)

Forrest G. Hall and Sara K. Conrad, Editors

Volume 238

BOREAS TGB-8 Photosynthetic Rate Data

over the SSA-OBS and the SSA-OJP

Manuel Lerdau

State University of New York, Stony Brook

National Aeronautics and

Space Administration

Goddard Space Flight Center

Greenbelt, Maryland 20771

November 2000
NASACenterforAeroSpaceInformation

7121StandardDrive

Hanover,MD21076-1320

PriceCode:A17

Availablefrom:

NationalTechnicalInformationService

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PriceCode:A10
BOREAS TGB-8 Photosynthetic Rate Data over the SSA-OBS and the

SSA-OJP

Manuel Lerdau

Summary

The BOREAS TGB-8 team collected data to investigate the controls over NMHC fluxes from boreal

forest tree species. This data set includes measurements of photosynthetic rates at mature jack pine and

black spruce sites. The data were collected at the OJP and OBS tower flux locations in the BOREAS

SSA. These areas contained mature stands of jack pine and black spruce and were the focal sites in the

BOREAS program for studies of biosphere/atmosphere exchange from these two habitat types. The

OBS site is situated in a black spruce/sphagnum bog with the largest trees 155 years old and 10-15 m

tall. The OJP site is in a jack pine forest, 80 to 120 years old, which lies on a sandy bench of glacial

outwash with the largest tree standing 15 m tall. Temporally, the data cover the period of 24-May-1994

to 19-Sep-1994. The data are stored 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-08 Photosynthetic Rate Data over the SSA-OBS and the SSA-OJP

1.2 Data Set Introduction

The mechanistic controls over nonmethane hydrocarbon (NMHC) fluxes from boreal forest trees

were investigated. These studies could be used to modify existing ecosystem models to include

NMHC emissions and their response to seasonality and resource variability (primarily water and

nitrogen).

Page 1
1.3 Objective/Purpose

The objective was to measure the photosynthesis at 30 °C and 1000 mmol/m2/s from the BOReal

Ecosystem-Atmosphere Study (BOREAS) Southern Study Area (SSA)-Old Black Spruce (OBS) and

SSA-Old Jack Pine (OJP).

1.4 Summary of Parameters

Average daily photosynthesis and standard deviation of photosynthesis.

1.5 Discussion

The research was ordered around three general questions: (1) To what extent are leaf carbon

balance and isoprene synthase activity (the enzyme responsible for isoprene emission) predictors of

NMHC flux? (2) How do leaf carbon balance and isoprene synthase activity depend on nitrogen/water

availability and carbon source/sink parameters? and (3) How do we modify the FORES-BGC

ecosystem model, based on question 1 and 2, to predict canopy-level NMHC fluxes? Studies included

seasonal monitoring of NMHC emissions and its relationship to plant phenology, photosynthesis,

respiration, isoprene synthase activity, and leaf starch concentrations.

1.6 Related Data Sets

BOREAS TGB-08 Monoterpene Concentration Data over the SSA-OBS and the SSA-OJP

BOREAS TGB-08 Starch Concentration Data over the SSA-OBS and the SSA-OJP

2. Investigator(s)

2.1 Investigator(s) Name and Title

Manuel Lerdau

2.2 Title of Investigation

The Relationship Between Non-Methane Hydrocarbon Emission and Leaf Carbon Balance in the

Boreal Forest: An Approach for Mechanistic Ecosystem Modeling

2.3 Contact Information

Contact 1:

Dr. Manuel Lerdau

Ecology and Evolution

SUNY

Stony Brook, NY

(516) 632-6633

(516) 632-7626 (fax)

mlerdau@life.bio, sunysb.edu

Contact 2:

Jeffrey A. Newcomer

Raytheon ITSS

Code 923

NASA GSFC

Greenbelt, MD 20771

(301) 286-7858

(301) 286-0239 (fax)

Jeffrey.Newcomer@ gsfc.nasa.gov

Page 2
3. Theory of Measurements

Sample Selection

For the photosynthesis/hydrocarbon measurements, 10 trees of each species were chosen that had

sunlit leaves accessible within 3 m of the ground. All measurements were conducted on sunlit leaves

that had developed the previous year. Tissue chemistry and gas exchange sampling on sunlit leaves

from branches much higher in the canopy showed that there was no significant effect of branch height

on photosynthetic rate or on tissue composition (ANOVA, p>0.05, data not shown). The black spruce

trees used in the bog transect/tissue chemistry sampling were chosen on the basis of having sunlit

leaves accessible within 2 m of the ground.

Sample Procedure

Hydrocarbon emissions: Samples were collected by enclosing branches in a temperature- and

light-controlled cuvette connected to a plant gas exchange system (Campbell MPH 1000, Campbell

Scientific, Logan, UT) and flowing hydrocarbon-free air over the needles. Temperature was controlled

by use of thermoelectric coolers provided by Campbell Scientific, and light intensity was controlled by

mounting a projector bulb at a fight angle to the top of the glass-topped cuvette. The light was then

reflected off of a cold mirror (45 ° cold mirror, 15-33233, OCLI, Santa Rosa, CA) mounted at a 45 °

angle to the cuvette. The mirror transmitted light at wavelengths >720 nm and reflected light of shorter

wavelengths. Hydrocarbon-free air was produced by pumping ambient air through a clean-air

generator (Aadco 5L, AADCO Instruments, Silver Springs, FL) and adding CO2 back to the entering

air stream. All flows and environmental conditions were monitored by the sensors and mass flow

controllers of the Campbell MPH 1000.

4. Equipment

4.1 Sensor/Instrument Description

None given.

4.1.1 Collection Environment

Samples were collected under all environmental conditions.

4.1.2 Source/Platform

Trees.

4.1.3 Source/Platform Mission Objectives

The purpose of the trees and branches for this experiment was to support the measurement

equipment.

4.1.4 Key Variables

Photosynthetic rate.

4.1.5 Principles of Operation

None given.

4.1.6 Sensor/Instrument Measurement Geometry

None given.

Page 3
4.1.7 Manufacturer of Sensor/Instrument

CampbellScientific

AADCO Instruments

SilverSprings,FL

Supelco

Bellafonte,PA

Tekmar

Cincinnati,OH

SKC, Inc.

EightyFour,PA

Finnigan

SanJose,CA

J&W Scientific

Folsom,CA

HewlettPackard

LACHAT Inst.

Mequon,WI

4.2 Calibration

Nonegiven.

4.2.1 Specifications

Nonegiven.

4.2.1.1 Tolerance

Nonegiven.

4.2.2 Frequency of Calibration

Nonegiven.

4.2.3 Other Calibration Information

Nonegiven.

5. Data Acquisition Methods

Samples were collected by enclosing branches in a temperature- and light-controlled cuvette connected

to a plant gas exchange system (Campbell MPH 1000, Campbell Scientific, Logan, UT) and flowing

hydrocarbon-free air over the needles. Temperature was controlled by use of thermoelectric coolers

provided by Campbell Scientific, and light intensity was controlled by mounting a projector bulb at a

fight angle to the top of the glass-topped cuvette. The light was then reflected off of a cold mirror (45 °

cold mirror, 15-33233, OCLI, Santa Rosa, CA) mounted at a 45 ° angle to the cuvette. The mirror

transmitted light at wavelengths >720 nm and reflected light of shorter wavelengths. Hydrocarbon-free

air was produced by pumping ambient air through a clean-air generator (Aadco 5L, AADCO

Instruments, Silver Springs, FL) and adding CO2 back to the entering air stream. All flows and

environmental conditions were monitored by the sensors and mass flow controllers of the Campbell

MPH 1000.

Page 4
6.1 Data Notes

Nonegiven.

6.2 Field Notes

None given.

6. Observations

7. Data Description

7.1 Spatial Characteristics

7.1.1 Spatial Coverage

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

SSA-OBS 53. 99 ° N, 105. 12 ° W

SSA-OJP 53. 92 ° N, 104. 69 ° W

7.1.2 Spatial Coverage Map

None given.

7.1.3 Spatial Resolution

These data are point source measurements taken near the given coordinates.

7.1.4 Projection

Not applicable.

7.1.5 Grid Description

Not applicable.

7.2 Temporal Characteristics

7.2.1 Temporal Coverage

The data were collected from 24-May-1994 to 19-Sep-1994.

7.2.2 Temporal Coverage Map

None given.

7.2.3 Temporal Resolution

Monthly averages of the data were submitted.

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

SAMPLE MONTH

SPECIES

SAMPLE AMOUNT

MEAN PHOTOSYNTHETIC RATE

STD ERR PHOTOSYNTHETIC RATE

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

SAMPLE MONTH

SPECIES

SAMPLE AMOUNT

MEAN PHOTOSYNTHETIC RATE

STD ERR PHOTOSYNTHETIC RATE

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, PEG,

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 BOREA

S, 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 month during which the data were measured.

Botanical (Latin) name of the species Genus

species).

The number of trees sampled.

Average measured photosynthesis at 30C

Standard error for the concentration

measurements.

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.

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]

SAMPLE MONTH [none]

SPECIES [none]

SAMPLE AMOUNT [counts]

MEAN PHOTOSYNTHETIC RATE [micromoles] [meter^-2] [second^-l]

STD ERR PHOTOSYNTHETIC RATE [micromoles] [meter^-2] [second^-l]

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

SUB SITE

SAMPLE MONTH

SPECIES

SAMPLE AMOUNT

MEAN PHOTOSYNTHETIC RATE

STD ERR PHOTOSYNTHETIC RATE

CRT_CN _ODE

REVISION DATE

[Assigned by BORIS Staff]

[Assigned by BORIS Staff]

Investigator

Investigator

Investigator

Campbell MPH i000

Investigator

[Assigned by BORIS Staff]

[Assigned by BORIS Staff]

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 SSA-OBS-FLXTR SSA-OJP-FLXTR None None None None

SUB SITE TGB08-CON01 TGB08-CON01 None None None None

SAMPLE MONTH N/A N/A None None None None

SPECIES N/A N/A None None None None

SAMPLE AMOUNT i0 i0 None None None None

MEAN PHOTOSYNTHETIC 2.5 10.5 None None None None

RATE

STD ERR 2 6 None None None None

PHOTOSYNTHETIC RATE

CRTFCN CODE CPI CPI None None None None

REVISION DATE 25-MAR-97 25-MAR-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

Page 7
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.

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,SAMPLE MONTH, SPECIES,SAMPLE AMOUNT,MEAN PHOTOSYNTHETIC RATE,

STD ERR PHOTOSYNTHETIC RATE,CRTFCN CODE,REVISION DATE

'SSA-OBS-FLXTR' 'TGB08-CON01' 'April', 'Picea mariana',lO,4.7,3.0, 'CPI',25-MAR-97

'SSA-OBS-FLXTR' 'TGB08-CON01' 'August/September', 'Picea mariana',lO,lO.5,5.0,

'CPI',25-MAR-97

'SSA-OBS-FLXTR' 'TGB08-CON01' 'July', 'Picea mariana',lO,9.8,5.0, 'CPI',25-MAR-97

8. Data Organization

8.1 Data Granularity

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

photosynthetic rate for a given site in a given month.

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. Data Manipulations

9.1 Formulae

None given.

9.1.1 Derivation Techniques and Algorithms

None given.

9.2 Data Processing Sequence

None given.

9.2.1 Processing Steps

None given.

9.2.2 Processing Changes

None given.

9.3 Calculations

9.3.1 Special Corrections/Adjustments

None given.

9.3.2 Calculated Variables

None.

9.4 Graphs and Plots

None.

10. Errors

10.1 Sources of Error

None given.

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

None given.

10.2.4 Additional Quality Assessments

None given.

10.2.5 Data Verification by Data Center

The data were examined for general consistency and clarity.

Page 9
11.1 Limitations of the Data

None given.

11.2 Known Problems with the Data

None given.

11.3 Usage Guidance

None.

11.4 Other Relevant Information

None.

11. Notes

12. Application of the Data Set

These data could be useful in refining plant growth and respiration models by comparing the model

results with actual measurements.

None given.

13. Future Modifications and Plans

14.1 Software Description

None given.

14.2 Software Access

None given.

14. Software

15. Data Access

The photosynthetic rate 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

Page 10
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.

17. References

17.1 Platform/Sensor/Instrument/Data Processing Documentation

None given.

17.2 Journal Articles and Study Reports

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.

Page 11
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.

17.3 Arehive/DBMS Usage Documentation

None given.

None given.

18. Glossary of Terms

ASCII

BOREAS

BORIS

CD-ROM

DAAC

E1

EOS

EOSDIS

FID

GC/MS

GIS

GSFC

HTML

NAD83

NASA

NMHC

NSA

OA

OBS

OJP

ORNL

PANP

SSA

TF

TGB

TKN

URL

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

- Electron Ionization

- Earth Observing System

- EOS Data and Information System

- Flame Ionization Detector

- Gas Chromatograph/Mass Spectrometer

- Geographic Information System

- Goddard Space Flight Center

- Hyper-Text Markup Language

- North American Datum of 1983

- National Aeronautics and Space Administration

- Nonmethane Hydrocarbon

- Northern Study Area

- Old Aspen

- Old Black Spruce

- Old Jack Pine

- Oak Ridge National Laboratory

- Prince Albert National Park

- Southern Study Area

- Tower Flux

- Trace Gas Biogeochemistry

- Total Kjeldahl Nitrogen

- Uniform Resource Locator

Page 12
20. Document Information

20.1 Document Revision Date

Written: 27-Jul- 1997

Last updated: 06-Aug- 1999

20.2 Document Review Date(s)

BORIS Review: 28-Aug- 1998

Science Review:

20.3 Document ID

20.4 Citation

When using these data, please include the following acknowledgment as well as citations of

relevant papers in Section 17.2:

Manuel Lerdan: Department of Ecology and Evolution, State University of New York, Stony

Brook, NY 11794-5245 Marcy Litvak and Russell Monson: Department of Environmental, population

and Organismic Biology, University of Colorado, Boulder, CO 80309

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

Lerdau, M., "The Relationship Between Non-Methane Hydrocarbon Emission and Leaf Carbon

Balance in the Boreal Forest: An Approach for Mechanistic Ecosystem Modeling." 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 13
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-8 Photosynthetic Rate Data over the SSA-OBS and the SSA-OJP

6. AUTHOR(S)

Manuel Lerdau

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. 238

11. SUPPLEMENTARY NOTES

M. Lerdau: State University of New York, Stony Brook; 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-8 team collected data to investigate the controls over NMHC fluxes from boreal

forest tree species. This data set includes measurements of photosynthetic rates at mature jack pine

and black spruce sites. The data were collected at the OJP and OBS tower flux locations in the

BOREAS SSA. These areas contained mature stands of jack pine and black spruce and were the focal

sites in the BOREAS program for studies of biosphere/atmosphere exchange from these two habitat

types. The OBS site is situated in a black spruce/sphagnum bog with the largest trees 155 years old

and 10-15 m tall. The OJP site is in a jack pine forest, 80 to 120 years old, which lies on a sandy bench

of glacial outwash with the largest tree standing 15 m tall. Temporally, the data cover the period of 24-

May-1994 to 19-Sep-1994. The data are stored 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

13

16. PRICE CODE

20. LIMITATION OF ABSTRACT

UL

Standard Form 298 (Rev. 2-89)

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298-102