BOREAS TGB-01/TGB-03 NEE Data over the NSA Fen
Summary
The BOREAS TGB-01 and TGB-03 teams collected several data sets that contributed
to understanding the measured trace gas fluxes over sites in the NSA. This data
set contains NEE measurements collected with chambers at the NSA fen in 1994 and
1996. Gas samples were extracted approximately every 7 days from 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/TGB-03 NEE Data over the NSA Fen
1.2 Data Set Introduction
Trace Gas Biogeochemistry Teams 1 and 3 (TGB-03) took net ecosystem exchange of
C02 (NEE) measurements at the Northern Study Area (NSA) fen site using chambers
from early June to September 1994 and from April to late October 1996 for the
BOReal Ecosystem -Atmosphere Study (BOREAS). Chamber NEE measurements were
taken at the four subsites within the fen in the NSA to determine the NEE rates
at these locations. The locations represent the range of plant communities,
water chemistry, and peatland types found in northern peatlands, including bog,
rich fen, poor fen, and collapse scar (pH ranges from 3.8 to 7.2). Continuous
measurements of water level and air and soil temperatures were taken to
understand the thermal and hydrological gradients associated with each plant
community. Measurements were made from the period of snow melt and thaw through
the full growing season to fall freeze up to examine the seasonal patterns of
NEE, differences in phenology, and relative importance of vascular plants and
bryophytes to the carbon balance. The following is a description of the
acquisition of data and the final data sets.
1.3 Objective/Purpose
The purpose of these measurements was to examine the range and magnitude of NEE
between the atmosphere and the wetland plants and soils. Continuous
measurements of water level and air and soil temperature measurements were also
made to understand the environmental controls on NEE. Plant species composition
within the NEE collars was measured to understand the differences in NEE among
the various plant communities in the fen.
1.4 Summary of Parameters
NEE, air and water temperatures, and water levels were measured in the NSA fen.
In addition, the plant communities for each chamber were characterized.
1.5 Discussion
NEE was measured at four subsites in the NSA fen, designated as collapse bog
(CB), collapse fen (CF), tower fen (TF), and Zoltai fen (ZF). Each collar
location is further designated by a spur (1, 2, 3, or 4) along the boardwalk at
each subsite and by the microtopography or dominant ground cover of the collar
location: pal=palsa, hk=hummock, hw=hollow, lwn=lawn, moat=open water at the
edge of the collapse scars, b_moss=brown moss, sph=sphagnum, and lich=lichen.
NEE, dark CO2 flux (respiration), and photosynthesis (derived from the
difference between NEE and respiration), photosynthetically active radiation
(PAR) are the parameters for the NEE data files. Continuous water table and
temperatures were recorded at each of the subsites to accompany the NEE
measurements. Temperatures of the air, 5-cm, 10-cm, 20-cm, and 50-cm peat depth
were measured at each subsite. Temperatures correspond to the collar location
at the subsite. In cases where the continuous data were missing, manual soil
temperatures were recorded. Continuous water level measurements were taken at
each subsite and are designated by the subsite abbreviation and the number of
the spur (e.g., CBWL1=collapse bog, water level, spur 1). Plant species
composition of each NEE collar was recorded as percent cover of the total collar
area.
The NEE data are included in four American Standard Code for Information
Interchange (ASCII) (DOS)-delimited text files, one for each subsite:
CB96_NEE.txt, CF96_NEE.txt, TF96_NEE.txt, and ZF96_NEE.txt. The parameters are
NEE, PAR, respiration, and photosynthesis. The water table and temperature
measurements are located in four ASCII (DOS)-delimited text files, one for each
subsite: CB96_WT1.txt, CF96_WT1.txt, TF96_WT1.txt, and ZF96_WT1.txt. The plant
data for the collars at all four subsites are located in one ASCII (DOS)-
delimited text file: fen96_pla.txt.
1.6 Related Data Sets
BOREAS TGB-01 CH4 Tower Flux Data over the NSA
BOREAS TGB-01/TGB-03 Water Table and Peat Temperature Data over the NSA
BOREAS TGB-03 CH4 Chamber Flux Data over the NSA Fen
BOREAS TGB-03 Plant Species Composition Data over the NSA Fen
2. Investigator(s)
2.1 Investigator(s) Name and Title
Dr. Jill L. Bubier
Research Associate
University of New Hampshire
Dr. Patrick M. Crill
Research Associate Professor
University of New Hampshire
Dr. Tim R. Moore
Professor
McGill University
2.2 Title of Investigation
Magnitude and Control of Trace Gas Exchange in Boreal Ecosystems
2.3 Contact Information
Contact 1
---------
Dr. Jill L. Bubier
Institute for the Study of Earth, Oceans, and Space
Complex Systems Research Center
University of New Hampshire
Durham, NH
(603) 862-4208
(603) 862-0188 (fax)
jill.bubier@unh.edu
Contact 2
---------
Dr. Patrick M. Crill
Institute for the Study of Earth, Oceans, and Space
Complex Systems Research Center
University of New Hampshire
Durham, NH
(603) 862-3519
(603) 862-0188 (fax)
patrick.crill@unh.edu
Contact 3
---------
Ruth K. Varner
Research Scientist
Institute for the Study of Earth, Oceans, and Space
Complex Systems Research Center
University of New Hampshire
Durham, NH
(603) 862-2939
(603) 862-0188
ruth.kerwin@unh.edu
Contact 4
---------
Dr. Tim R. Moore
Geography Department
McGill University
Montreal, Quebec
Canada
(514) 398-4961
(514) 398-7437 (fax)
moore@felix.geog.mcgill.ca
3. Theory of Measurements
Chamber fluxes measure the changes in mixing ratio of trace gases (CO2) in a
closed headspace over a period of time. This headspace is isolated from the
atmosphere; therefore, the exchange of material between the covered soil and the
headspace can be quantified.
4. Equipment
4.1 Sensor/Instrument Description
NEE was quantified with a LI-COR (LI-COR, Inc., Lincoln, Nebraska) portable
photosynthesis system (LI-6200), which includes the LI-6250 infrared gas
analyzer (IRGA), system console with 256K memory, 9960-035 Sensor Housing,
6000TC leaf temperature thermocouples, a Vaisala HUMICAP humidity sensor,
quantum sensor for PAR measurements, field stand, 6000B rechargeable battery
packs, 6200B rechargeable battery packs, LI-6020 battery charger, 6200DP
desiccant tubes for magnesium perchlorate, 1000-90 communications software,
6200-25 support software, and RS-232C output leads for Data Terminal Equipment
(DTE) and Data Communication Equipment (DCE). A wood frame backpack for
carrying the LI-6200 and ancillary equipment to the field sites was designed and
manufactured by George Stone at Arundo Woodworking, Hyde Park, Vermont.
The portable climate-controlled chambers were designed by Patrick Crill, Paul
Carroll, and Ruth Kerwin and were modeled after a chamber described in Whiting
et al., J. Geophys. Res. 96: 13,067-13,071, 1991. The chambers were
manufactured at University of New Hampshire (UNH) by Ruth Kerwin and were
constructed of clear Lexan and Teflon film to allow maximum light penetration.
One of two chamber sizes of chambers was used depending on the height of the
vegetation. The larger chamber covered 3660 cm2 of surface area and was 90.5 cm
in height. The aluminum frame was covered on three sides with 5-mil Teflon
film. The fourth side was constructed of a rigid polycarbonate wall (1/8�
Lexan) on which the climate control and sampling equipment were mounted. The
chamber top was made of 1/8� Lexan and was removable to allow equilibration of
plant communities to ambient conditions between sampling runs. The climate
control system consisted of a small heat exchanger (radiator) and a cooler for
pumping cold water. The cooler was filled with water, ice, and a battery-powered
pump and attached to the chamber with hoses to circulate the cold water to the
heat exchanger. Three small brushless fans circulated the air across the
radiator, cooling the enclosed air to within 1o C of ambient air temperature
outside the chamber. The smaller chamber covered the same area as the larger
chamber to fit the same collars (3660 cm2), but was half the height (45 cm).
All four sides and top of the smaller chamber were constructed of 1/8� Lexan.
In order to measure NEE at different light levels, shrouds of different mesh
size were used to reduce the light entering the chamber to 1/2, 1/4, and 0 full
light. The aluminum collars were designed by Patrick Crill and manufactured at
UNH. The collars were inserted into the peat in the fall of 1995 to minimize
disturbance during the sampling period beginning in the spring of 1996.
Continuous water table measurements were made with a float and counter weight
attached to a wheel and potentiometer mounted on a platform that rested on top
of a wooden post anchored in the clay below the peat. The potentiometer, which
was wired to either a CR10 or CR7 data logger (Campbell Scientific, Inc., Logan,
Utah), recorded the change in water level in mV. Wells were constructed of PVC
tubing. Peat temperatures were recorded with type T thermocouples (copper-
constantan) attached at four levels (5, 10, 20 and 50 cm) to wooden stakes and
inserted into the peat during the fall of 1995. The thermocouples were wired to
either CR10 or CR7 dataloggers and calibrated to reference temperatures.
4.1.1 Collection Environment
The chamber fluxes were collected under all environmental conditions. The
calibrations and data analyses were completed at the Heritage North Museum
laboratory in Thompson, Manitoba.
4.1.2 Source/Platform
Ground.
4.1.3 Source/Platform Mission Objectives
The objective was to determine the plant-soil-surface exchange rates of CO2 at
the NSA fen complex.
4.1.4 Key Variables
The key variables measured during the sampling period were NEE, PAR, air
temperature, peat temperature at four peat depths, water table position, and
plant species composition.
4.1.5 Principles of Operation
The LI-6200 portable photosynthesis system consists of a LI-6250 CO2 IRGA, sensor
head, and datalogger. The LI-6250 consists of an IRGA, a mass flow meter, and a
pump. It can be configured for either absolute or differential modes of
operation by rearranging the external plumbing. The analyzer was used in
absolute mode. The CO2 measurement is based on the difference in intensity of
infrared radiation passing through two gas sampling tubes: a reference tube
contains a known amount of CO2, and a sample tube contains an unknown amount.
Infrared radiation is transmitted through both paths, and the output of the
analyzer is proportional to the difference in absorption between the two. The
lead selenide detector is cooled and regulated to -12� C by a thermoelectric
cooler. To keep the detector housing free of water vapor and CO2, a small
bottle of magnesium perchlorate and soda lime is attached to the detector (LI-
COR, Inc.).
4.1.6 Sensor/Instrument Measurement Geometry
Not applicable.
4.1.7 Manufacturer of Sensor/Instrument
Manufacturer of LI-6200 portable photosynthesis system:
LI-COR, Inc.
Box 4425
4421 Superior St.
Lincoln, NR 68504 USA
(402) 467-3576
(402) 467-2819 (fax)
Manufacturer of CR10 and CR7 dataloggers:
Campbell Scientific, Inc.
815 W. 1800 N.
Logan, UT 84321-1784 USA
(801) 753-2342
(801) 750-9540 (fax)
4.2 Calibration
4.2.1 Specifications
The IRGA was calibrated against Canadian Atmospheric Environment Services (AES)
certified primary CO2 standards acquired by the BOREAS project. Calibration in
absolute mode was accomplished by flowing 0-ppm CO2 through the analyzer
(scrubbing of CO2 with soda lime) and adjusting the zero potentiometer until the
displayed reading was 0 ppm. Then the span was checked by flowing a known
concentration of CO2 through the analyzer and adjusting the span potentiometer
until the displayed reading was correct. An AES standard of 397.3 ppm CO2 was
used for the span calibration. The analyzer was usually within 1-2 ppm of the
known concentration. The zero and span were checked twice during each
calibration.
4.2.1.1 Tolerance
None given.
4.2.2 Frequency of Calibration
The CO2 analyzer was calibrated on a daily basis, every morning in the Heritage
North Museum lab before going to the field sites. The zero was rechecked and
calibrated several times during the day because it was sensitive to changes in
air temperature.
4.2.3 Other Calibration Information
Not applicable.
5. Data Acquisition Methods
NEE was calculated using the change in concentration of CO2 in the chamber
headspace over a 2.5-minute sampling period. The IRGA sampled every 5 seconds
and averaged the flux rate every 30 seconds. The CO2 flux for each sampling run
was calculated as a mean of the five 30-second sampling intervals during the
2.5-minute period. The total sampling period was kept very short to minimize
the time the plants were exposed to the chamber environment. Temperature and
relative humidity inside the chamber were monitored closely during each run to
make sure that conditions did not change significantly during the sampling
period. For every collar, separate sampling runs were conducted under full
light, 1/2 light, 1/4 light, and dark conditions. Less than full light
measurements were obtained by placing shrouds of different mesh sizes over the
chamber. Grab samples of air for measuring CH4 flux were taken during each
dark run (see documentation file CH4doc.doc for BOREAS TGB-01).
Temperature and water level were measured continuously and averaged every hour
on the CR10 or CR7 dataloggers. Manual measurements of air temperature, peat
temperature, and water table position were made at the same time as the NEE
measurements.
Plant species composition was recorded in each collar during the height of the
growing season in mid-July 1996. Visual estimates of percent cover of each
vascular plant and bryophyte species were made based on light interception of
the canopy of each species. Percent cover of all species totals over 100
percent for each collar because of several layers of vegetation. Specimens for
each unknown species were collected in plant communities outside of the collars
and identified in the lab at the Heritage North Museum, Thompson, Manitoba, or
at Dr. Barry Rock's laboratory at Complex Systems Research Center, UNH, Durham,
NH.
6. Observations
6.1 Data Notes
None given.
6.2 Field Notes
None given.
7. Data Description
7.1 Spatial Characteristics
7.1.1 Spatial Coverage
CB collars were located in a small, circular collapse scar (75 m diameter)
almost completely surrounded by a permafrost peat plateau, behind the generator
shed. Three spurs were located perpendicular to the boardwalk. Spur 1 was
adjacent to the moat, or open water lagg area; spur 2 was in a hummock-hollow
area; and spur 3 was in the center of the collapse scar. In addition to the
collars in the collapse scar, this subsite had two collars on the palsa (frozen
peat plateau) adjacent to the collapse scar. Collar designations were as
follows:
CB1moat = collapse bog, spur 1, moat
CB2hk = collapse bog, spur 2, hummock
CB2hw = collapse bog, spur 2, hollow
CB3hk = collapse bog, spur 3, hummock
CBpalmoss = collapse bog, palsa, moss
Cbpallich = collapse bog, palsa, lichen
CF collars were located in a small, linear collapse feature that was east of and
accessed from the main trail to the tower hut. Four spurs were located
perpendicular to the main boardwalk. Spur 1 was located adjacent to the moat
spur 2 was in a uniform lawn of Sphagnum riparium spur 3 was in a small treed
ridge and spur 4 was on the far edge of the collapse scar where the influence of
groundwater was apparent. Collar designations were as follows:
CF1moat = collapse fen, spur 1, moat
CF2lwn = collapse fen, spur 2, lawn
CF3hka = collapse fen, spur 3, hummock (a)
CF3hkb = collapse fen, spur 3, hummock (b)
CF4b_moss = collapse fen, spur 4, brown moss
CF4sph = collapse fen, spur 4, sphagnum
TF collars were located along the boardwalk to the micrometeorological tower in
the NSA fen. Four spurs were located perpendicular to the main boardwalk. Spur
1 was just beyond the moat at the beginning of the boardwalk in a treed area of
tamarack (Larix laricina) spur 2 was in a tall shrub zone (Betula glandulosa),
spur 3 was in a low shrub zone just before the hut and spur 4 was just beyond
the hut in a mixed low shrub/sedge zone. Collar designations were as follows:
TF1hk = tower fen, spur 1, hummock
TF2hk = tower fen, spur 2, hummock
TF2hw = tower fen, spur 2, hollow
TF3hk = tower fen, spur 3, hummock
TF3hw = tower fen, spur 3, hollow
TF4hw = tower fen, spur 4, hollow
ZF collars were located in a sedge-dominated (Carex spp.) fen area of the
peatland complex, north of the fen tower, and accessed from Route 391. Three
spurs were located perpendicular to the main boardwalk. Spur 1 was on a treed
ridge; spur 2 was in a shrub-dominated hummock-hollow area; and spur 3 was in a
wet, sedge-dominated area near the edge of a palsa. Collar designations were as
follows:
ZF1hk = zoltai fen, spur 1, hummock
ZF2hk = zoltai fen, spur 2, hummock
ZF2hw = zoltai fen, spur 2, hollow
ZF3b_moss = zoltai fen, spur 3, brown moss
ZF3hw = zoltai fen, spur 3, hollow (Sphagnum)
ZF3hk = zoltai fen, spur 3, hummock (Sphagnum)
1994 NEE data from Lianne Bellisario:
CB1cL1 = collapsed bog, spur 1, carpet, collar 1
CB1cL2 = collapsed bog, spur 1, carpet, collar 2
CB1cL3 = collapsed bog, spur 1, carpet, collar 3
CB1cL4 = collapsed bog, spur 1, carpet, collar 4
CB1cL5 = collapsed bog, spur 1, carpet, collar 5
CF1cL1 = collapse fen, spur 1, carpet, collar 1
CF1cL2 = collapse fen, spur 1, carpet, collar 2
CF1cL3 = collapse fen, spur 1, carpet, collar 3
CF1cL4 = collapse fen, spur 1, carpet, collar 4
CF1cL5 = collapse fen, spur 1, carpet, collar 5
CF2nL1 = collapse fen, spur 2, lawn, collar 1
CF2nL2 = collapse fen, spur 2, lawn, collar 2
CF2nL3 = collapse fen, spur 2, lawn, collar 3
CF2nL4 = collapse fen, spur 2, lawn, collar 4
CF2nL5 = collapse fen, spur 2, lawn, collar 5
TF4wL1 = tower fen, spur 4, hollow, collar 1
TF4cL2 = tower fen, spur 4, carpet, collar 2
TF4cL3 = tower fen, spur 4, carpet, collar 3
TF4kL4 = tower fen, spur 4, carpet, collar 4
ZF3cL1 = zoltai fen, spur 3, carpet, collar 1
ZF3cL2 = zoltai fen, spur 3, carpet, collar 2
ZF3cL3 = zoltai fen, spur 3, carpet, collar 3
ZF3pL4 = zoltai fen, spur 3, pool, collar 4
ZF3pL5 = zoltai fen, spur 3, pool, collar 5
7.1.2 Spatial Coverage Map
None given.
7.1.3 Spatial Resolution
The 24 collars spanned the full range of hydrologic, plant community, and water
chemistry gradients found in the larger peatland complex. They were placed
along those gradients at each of the four subsites to capture the spatial
variability in CO2 fluxes.
7.1.4 Projection
Not applicable.
7.1.5 Grid Description
Not applicable.
7.2 Temporal Characteristics
7.2.1 Temporal Coverage
The chamber NEE measurements were made from 06-June-1994 to 02-September 1994
and 15-April-1996 to 23-October-1996. Associated water table and temperature
measurements were recorded as well but are provided in a separate data set.
7.2.2 Temporal Coverage Map
Not applicable.
7.2.3 Temporal Resolution
The chamber NEE measurements for 15 of the collars were made approximately every
7 days.
7.3 Data Characteristics
Data characteristics are defined in the companion data definition file
(tgbfenne.def)
7.4 Sample Data Record
Sample data format shown in the companion data definition file (tgbfenne.def)
8. Data Organization
8.1 Data Granularity
All of the TGB-01/TGB-03 NEE Data over the NSA Fen are contained in one dataset.
8.2 Data Format(s)
The data file contains 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. Sample data records are shown in
the companion data definition file (tgbfenne.def)
9. Data Manipulations
9.1 Formulae
None.
9.1.1 Derivation Techniques and Algorithms
Not applicable.
9.2 Data Processing Sequence
9.2.1 Processing Steps
CO2 (NEE) data were downloaded from the LI-6200 datalogger to laptop computers
in the Heritage North Museum lab every day after returning from the field. The
data were entered into spreadsheets, and the average flux for the 2.5-minute
runs were calculated. Ancillary data that were recorded during the runs and
included on the data sheets were number of sample runs, time interval for
calculating flux rate, temperature of the chamber, relative humidity, and
chamber volume. Data on leaf measurements, stomatal conductance, stomatal
resistance, etc., were not relevant to this study. Temperature and water table
data from the CR10 and CR7 dataloggers were downloaded every 3-4 days and
entered into the spreadsheets at the lab.
9.2.2 Processing Changes
Not applicable.
9.3 Calculations
If -888 is present in the data set, it indicates that a measurement was taken,
but was discarded for some reason. If -999 is present, then no data were taken.
9.3.1 Special Corrections/Adjustments
Not applicable.
9.3.2 Calculated Variables
Not applicable.
9.4 Graphs and Plots
None given.
10. Errors
10.1 Sources of Error
Placing the chamber down with much force can change the pressure inside the
chamber to other than ambient and can affect the mechanisms and processes
producing/taking up CO2. (Errors such as this would have been written down in
the lab/field books and these data therefore would have been edited out.)
10.2 Quality Assessment
10.2.1 Data Validation by Source
None given.
10.2.2 Confidence Level/Accuracy Judgment
Not applicable.
10.2.3 Measurement Error for Parameters
None given.
10.2.4 Additional Quality Assessments
Not applicable.
10.2.5 Data Verification by Data Center
Data were examined for general consistency and clarity.
11. Notes
11.1 Limitations of the Data
None given.
11.2 Known Problems with the Data
None given.
11.3 Usage Guidance
Not applicable.
11.4 Other Relevant Information
Not applicable.
12. Application of the Data Set
The chamber flux data can be used in connection with the tower flux data to
determine the CO2 exchange between the atmosphere and the peatland soils. The
remote sensing images, the chamber plant community data, and the chamber NEE
data, can be used to scale the CO2 fluxes from the plot scale to wetland
landscape.
13. Future Modifications and Plans
None.
14. Software
Not applicable.
14.1 Software Description
Not applicable.
14.2 Software Access
Not applicable.
15. Data Access
15.1 Contact Information
Ms. Beth Nelson
BOREAS Data Manager
NASA GSFC
Greenbelt, MD
(301) 286-4005
(301) 286-0239 (fax)
Elizabeth.Nelson@gsfc.nasa.gov
15.2 Data Center Identification
See Section 15.1.
15.3 Procedures for Obtaining Data
Users may place requests by telephone, electronic mail, or fax.
15.4 Data Center Status/Plans
The TGB-01/TGB-03 NEE data are available from the Earth Observing System Data
and Information System (EOSDIS) Oak Ridge National Laboratory (ORNL) Distributed
Active Archive Center (DAAC). The BOREAS contact at ORNL is:
ORNL DAAC User Services
Oak Ridge National Laboratory
(865) 241-3952
ornldaac@ornl.gov
ornl@eos.nasa.gov
16. Output Products and Availability
16.1 Tape products
None.
16.2 Film Products
None.
16.3 Other Products
Comma-separated ASCII files with text delimited by single quotes (�).
17. References
17.1 Platform/Sensor/Instrument/Data Processing Documentation
Not applicable.
17.2 Journal Articles and Study Reports
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.and F. Hall. 1997. BOREAS Overview Paper. JGR Special Issue.
Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem-Atmosphere
Study: 1994 Operations. NASA BOREAS Report (OPSDOC 94).
Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem-Atmosphere
Study: 1996 Operations. NASA BOREAS Report (OPSDOC 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
earlyresults from the 1994 field year. Bulletin of the American Meteorological
Society. 76(9):1549-1577.
Whiting et al., 1991. J. Geophys. Res. 96: 13,067-13,071.
17.3 Archive/DBMS Usage Documentation
None.
18. Glossary of Terms
None given.
19. List of Acronyms
AES - Atmospheric Environment Services, Canada
ASCII - American Standard Code for Information Interchange
BOREAS - BOReal Ecosystem-Atmosphere Study
BORIS - BOREAS Information System
BP - Beaver Pond site, NSA
CB - Collapse Bog
CF - Collapse Fen
CMDL - Climate Monitoring and Diagnostics Laboratory
DAAC - Distributed Active Archive Center
DTE - Data Terminal Equipment
DCE - Data Communication Equipment
ECD - Electron Capture Detector
EOS - Earth Observing System
EOSDIS - EOS Data and Information System
FID - Flame Ionization Detector
GC - Gas Chromatograph
GSFC - Goddard Space Flight Center
IRGA - Infrared Gas Analyzer
LI-6200 - LI-COR portable photosynthesis system
NASA - National Aeronautics and Space Administration
NEE - Net Ecosystem Exchange of C02
NSA - Northern Study Area
OBS - Old Black Spruce
OJP - Old Jack Pine
ORNL - Oak Ridge National Laboratory
PANP - Prince Albert National Park
PAR - Photosynthetically Active Radiation
SSA - Southern Study Area
TCD - Thermal Conductivity Detector
TF - Tower Fen
TGB-03 - Trace Gas Biogeochemistry Team 3
UNH - University of New Hampshire
URL - Uniform Resource Locator
YJP - Young Jack Pine site, NSA
ZF - Zoltai fen
20. Document Information
20.1 Document Revision Date
Written:
Last updated: 05-Jun-98
20.2 Document Review Date(s)
BORIS Review: 10-Mar-98
Science Review:
20.3 Document
20.4 Citation
None given.
20.5 Document Curator
20.6 Document URL
Keywords
---------------
Net Ecosystem Exchange
NEE
TGB01_TGB03_NEE.doc
06/11/98