Litvak, M. E., M. L. Goulden, S. D. Miller, and S. Wofsy. 2001. BOREAS Follow-On FLX-04 Tower Flux and Meteorological Data from NSA Burn Site. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
1.2 Data Set Introduction
Eddy-correlation flux measurements of
sensible heat, latent heat, CO2, and momentum fluxes were made
at 4 sites in the BOReal Ecosystem-Atmosphere Study (BOREAS) Northern Study
Area (NSA) for 4-6 weeks during either the 1999 or 2000 peak growing season
(June-September). All sites experienced large-scale stand replacing wildfires
of similar severity and were located in upland areas with well-drained
soils and similar soil type. In all sites, the pre-burn dominant species
was black spruce, and the regenerating forest will likely return to black
spruce.
1.3 Objective/Purpose
The principal objective was to determine,
directly, the net ecosystem exchange of CO2 and the surface
energy budget over these forests during the peak growing season. These
observations were coupled with a comprehensive characterization of the
physical environment (Photosynthetically Active Radiation (PAR), soil temperature,
etc.).
These measurements are a preliminary
part of an ongoing study to investigate how boreal forest CO2,
and energy exchange changes during secondary succession. Most investigations
of forest CO2 exchange in the boreal forest during the BOREAS
campaign concentrated on mature forests only. One of the most striking
aspects of the boreal forest landscape however is that it is a mosaic of
large mixed-aged patches created by fires that burn in individual locations
once every 100 years. The various stands in the mosaic likely differ markedly
in carbon balance, with the recently disturbed sites probable sources of
CO2, the middle-aged stands likely sinks of CO2,
and the older stands most likely in near balance with the atmosphere. Observations
from a single site therefore tells little about the current or future carbon
balance of the region. The ultimate goal of this study is to provide a
reliable determination of boreal forest carbon balance by considering the
effect of stand age on CO2 exchange. To do this we will make
year round measurements of CO2 and energy exchange in seven
closely-matched stands (in terms of topography, soil type, and pre-burn
forest characteristics), that range in age-since-last-disturbance from
2 to 150 years. The complete chronosequence includes burns from 1998, 1995,
1989, 1981, 1964, and 1850 (NSA-OBS).
1.4 Summary of Parameters
Latent heat flux, sensible heat flux,
carbon dioxide flux, momentum flux, CO2 concentration, air temperature,
net radiation, incident Photosynthetic Photon Flux Density (PPFD), reflected
PPFD, wind speed and direction.
1.5 Discussion
Eddy-correlation flux measurements for
CO2 and H2O were made at 4 locations in the northern
study area during the growing season of 1999 and 2000. The principal objective
was to directly determine the net ecosystem exchange of CO2,
and the surface energy budget during the peak growing season at these sites
and to couple these observations with a comprehensive characterization
of the physical environment (PAR, air temperature, soil temperature etc.).
Two roving lightweight portable eddy-correlation system powered by solar
power were used to measure above canopy eddy fluxes of CO2,
sensible heat and water vapor, and incident and intercepted PAR. Soil temperature
and moisture measurements at each site were recorded by a meteorological
station located 100 m from the tower. Among other things, these measurements
should allow assessment of the importance of secondary succession in determining
CO2 and energy exchange from boreal forests.
1.6 Related Data Sets
Tower flux measurements made at other sites:
BOREAS TF-09 NSA OJP Tower Flux, Meteorological, and Soil Temperature
Data
BOREAS TF-09 SSA OBS Tower Flux, Meteorological, and Soil Temperature
Data
BOREAS TF-10 NSA Fen and YJP Flux, Meteorological, and Soil Temperature
Data
Other measurements made at the NSA-UBS site:
BOREAS TE-06 Forest Biophysical Measurements
BOREAS Follow-On Measurements of Above/Below ground NPP (Univ. of Wisconsin
- Gower, P.I.)
2.2 Title of Investigation
Peak growing season CO2 and
energy exchange along a boreal forest chronosequence
2.3 Contact Information
Contact 1:
Dr. Marcy Litvak
University of California
Irvine, CA
(949) 824-2314
(949) 824-3256 (fax)
mlitvak@uci.edu
Contact 2:
Dr. Mike Goulden
University of California
Irvine, CA
(949) 824-1983
(949) 824-3256 (fax)
mgoulden@uci.edu
4.1.1 Collection EnvironmentNSA-BRN-1989
The dominant tree species was aspen (1 m tall), with regenerating jack pine and black spruce. Numerous forb species were present as well. Measurements were made continuously from 23 July - 14 September, 2000.NSA-BRN-1981
Dominant species were aspen (8m), jack pine(7 m), black spruce(4 m), and alder.NSA-BRN-1964
Dominant species were black spruce, with jack pine and aspen. Ground cover was primarily feather moss.NSA-BRN-1930
The 70 year old site was located 50 km from the nearest town and 200 m from the nearest road in the site designated as the Northern Study Area (NSA) Upland Black Spruce (UBS) site. The site is relatively homogeneous, and the trees were approximately 10-12 m tall. The ground cover was primarily feather moss mixed with some lower-level areas of sphagnum bog. Black spruce is the dominant species, with scattered jack pine, aspen, and alder present as well.4.1.2 Source/Platform
The components of the eddy flux system used were different in 1999 and 2000. The differences are summarized below.Summary of Eddy Correlation System used by UCI (1999):
Measurement Sensor -------------------------------- ------------------------------------------ Vertical and horizontal velocity 3-axis Solent HS sonic anemometer Temperature sensor Solent HS sonic anemometer Moisture sensor (closed-path) LiCor 6262 Infrared Gas Analyzer (IRGA) CO2 sensor (closed-path) LiCor 6262 IRGA Inlet Filter Gelman Zeflour 3 µm pores, 4 x 50 mm dia. Tubing 0.156 ID PFA Teflon, 22 meters long Pumps KNF Neuberger KN828 DC brushless pump Data logger Campbell Scientific CR23X Pressure and flow controllers MKS Instruments Summary of Eddy Correlation System used by UCI (2000): Measurement Sensor -------------------------------- ------------------------------------------ Vertical and horizontal velocity Campbell Scientific CSAT3 sonic anemometer Temperature sensor Campbell Scientific CSAT3,Vaisala HMP45C Moisture sensor (open-path) LiCor 7500 Open Path Infrared Gas Analyzer (IRGA) CO2 sensor (open-path) LiCor 7500 IRGA4.1.3 Source/Platform Mission Objectives
The tower was erected to support instruments above the forest canopy to collect flux data from various burns in the NSA.4.1.4 Key Variables
Eddy-correlation measurements of latent heat flux, sensible heat flux, CO2 flux, and momentum flux. Above canopy CO2 and water vapor concentration, and air temperature. Incident and reflected PPFD. Wind speed and direction.4.1.5 Principles of Operation
Sonic Anemometer:
Three-dimensional orthogonal wind velocities (u, v, and w) and virtual temperature (Tv) were measured with a sonic anemometer (1999:Solent, Gill Instruments, Lymington, U.K.; 2000:Campbell Scientific Utah, USA). Virtual temperature heat flux was converted to sensible heat flux using algorithms described by Kaimal and Gaynor (1991) and Schotanus et al. (1983).Infrared Absorption Spectrometer:
Water vapor and CO2 concentrations were measured with a closed-path infrared absorption spectrometer in 1999, and with an open-path infrared absorption spectrometer in 2000.For the closed path system in 1999: The LiCor sensor was placed in an insulated box at the base of the tower. The air was drawn down the tower at 7 standard liters per minute. Pressure was controlled in the cell of the LiCor at 48 kPa. The delay time between the wind speed and concentration measurement was calculated at 2.5 seconds. The time constant for response time of the instrument to a change in the mixing ratio of the air sample was determined to be 0.41 seconds for CO2 and .44 seconds for H2O. The difference in time was due to adsorption of H2O to the tubing. The response-time corrections typically were 5% during the day and 15% at night. An averaging time of 30 minutes was used and a linear least-squares regression was used to detrend the flux data.
4.1.6 Sensor/Instrument Measurement Geometry
1999: The sonic anemometer was located at a height of 17-m on a 18-m triangular- cross-section telescoping tower (Aluma Tower). Air temperature and relative humidity, wind speed and direction, incident and reflected PPFD, incident and reflected solar radiation, and net radiation were measured at 17.0 m.
2000: At each burn, the sonic anemometer, open-path IRGA, air temperature and relative humidity sensor, incident and reflected PPFD, incident and reflected solar radiation and net radiation sensors were located at the same height on the triangular-cross section telescoping tower (Aluma Tower). The sensor heights for each burn site are as follows: 1989 burn(10 m), 1981 burn (12 m), 1964 burn (13 m).
4.1.8 Manufacturer of Sensor/Instrument
Sonic anemometer:
Solent HS
Gill Instruments
Lymington, U.K.CSAT3
Campbell Scientific Instruments
P.O. Box 551
Logan, UT 84321CO2 and H2O sensors:
LiCor
P.O. Box 4425
Lincoln, NEData logging systems:
Campbell Scientific Instruments
P.O. Box 551
Logan, UT 84321Pressure and Flow Control:
MKS Instruments
Andover, MA
4.2 Calibration
4.2.1 SpecificationsReturn to top of document.Sonic anemometer: Supplied by the manufacturer.
1999 CO2 sensor: Calibrated every 6 hours by passing a span gas of 352±5% ppm through the LiCor IRGA at 1 standard liter per minute for 2 minutes followed by zero air (zero air passed through a column of soda lime) for 2 minutes.
1999 H2O sensor: Calibrated at the beginning and end of the month using a LiCor dew point generator. Calibration was checked by comparison with a Vaisala probe on the tower. Zero information for the LiCor IRGA was recorded by passing zero air through the sample cell (zero air passed through a column of magnesium perchlorate) for 2 minutes, every 6 hours.
2000 CO2 sensor: Calibrated once before IRGA was installed on tower at each site. Span gas was 349(5% ppm CO2, and zero air contained less than 1% hydrocarbons. H2O sensor: Calibrated once before IRGA was installed on tower at each site using a LiCor dew point generator.
4.2.1.1 Tolerance
Not known.
4.2.2 Frequency of Calibration
See 4.2.14.2.3 Other Calibration Information
Not known.
NSA-BRN-1989
The sonic was pointing due west, thus
fluxes from wind directions 80-100 are questionable.
NSA-BRN-1981
The sonic was pointing north, and there
was a patch of unburned older black spruce approximately 100 m to the north
and 150 m to the south. We suggest disgarding fluxes from directions 345-30
degrees, and from 150-200 degrees.
NSA-BRN-1964
The sonic was pointing due north and
tower was located 75 m north of a road cut. Because of this, fluxes from
wind directions 150-250 are questionable.
NSA-BRN-1930
The sonic was pointing due west, thus
fluxes from wind directions 80-100 are questionable.
6.2 Field Notes
None Available
7.1.1 Spatial CoverageSite Latitude Longitude Notes ------------ --------------- ---------------- ------------------------------ NSA-BRN-1989 55° 54' 24" N 098° 58' 48" W just west of Footprint River NSA-BRN-1981 55° 51' 52.8" N 098° 28' 37.1" W approx. 1 mile south of OBS NSA-BRN-1964 55° 55' 4.8" N 098° 21' 59.2" W NSA-BRN-1930 55° 54' 48" N 098° 31' 23" W Upland Black Spruce (UBS) site7.1.2 Spatial Coverage Map
Not applicable.7.1.3 Spatial Resolution
The data represent point source measurements taken at the given locations. The location and size of the footprint from which the measurements were made varied with ambient meteorological conditions.7.1.4 Projection
Not applicable.7.1.5 Grid Description
Not applicable.
7.2 Temporal Characteristics
7.2.1 Temporal Coverage
Measurements were made from August 1999 to September 2000.7.2.2 Temporal Coverage Map
NSA-BRN-1989 - Measurements made continuously from 23-Jul-2000 to 14-Sep-2000.
NSA-BRN-1981 - Measurements made continuously from 23-Jul-2000 to 30-Sep-2000.
NSA-BRN-1964 - Measurements made continuously from 28-May-2000 to 11-Jul-2000.
NSA-BRN-1930 - Measurements made continuously from 11-Aug 1999 to 08-Sep-2000.Given in Section 1.3
7.2.3 Temporal Resolution
In both 1999 and 2000, data for flux measurements (output from sonic anemometer and IRGA) were continuously recorded at 4 Hz while output from air temperature, relative humidity, incident and reflected PPFD, incident and reflected solar radiation and net radiation sensors were recorded at 0.5 Hz. The data were stored on a laptop PC and downloaded twice per week. Fluxes and meteorological variables were calculated on half-hourly basis.
7.3 Data Characteristics
7.3.1 Parameter/Variable7.4 Sample Data Record
The parameters contained in the data files are:Column Name ------------------------------ SITE_NAME DATE_OBS TIME_OBS SENSIBLE_HEAT_FLUX_ABV_CNPY LATENT_HEAT_FLUX_ABV_CNPY NET_RAD_ABV_CNPY CO2_FLUX_ABV_CNPY CO2_CONC_ABV_CNPY DOWN_PPFD_ABV_CNPY DOWN_PPFD_ABV_CNPY MOMENTUM_FLUX_ABV_CNPY WIND_DIR_MAG_ABV_CNPY WIND_SPEED_ABV_CNPY FRICTION_VELOC_ABV_CNPY AIR_TEMP_ABV_CNPY RELATIVE_HUM_ABV_CNPY CRTFCN_CODE REVISION_DATE7.3.2 Variable Description/Definition
The descriptions of the parameters contained in the data files are:Column Name Description ------------------------------ ------------------------------------------------ SITE_NAME The identifier assigned to the site by BOREAS, in the format SSS-BRN-YYYY where SSS identifies the portion of the study area: NSA, and YYYY identifies the age of forest (year of burn).- 1930, 1964, 1981, or 1989. DATE_OBS The date on which data were collected TIME_OBS The start of the 30-minute period when the data were collected, in Greenwich Mean Time (GMT). SENSIBLE_HEAT_FLUX_ABV_CNPY The sensible heat flux measured above the canopy. LATENT_HEAT_FLUX_ABV_CNPY The latent heat flux measured above the canopy. NET_RAD_ABV_CNPY The net radiation measured above the canopy. CO2_FLUX_ABV_CNPY The carbon dioxide flux measured above the canopy CO2_CONC_ABV_CNPY The carbon dioxide concentration measured above the canopy. DOWN_PPFD_ABV_CNPY The incoming photosynthetic photon flux density measured above the canopy. UP_PPFD_ABV_CNPY The downward photosynthetic photon flux density measured above the canopy. MOMENTUM_FLUX_ABV_CNPY The momentum flux measured above the canopy. WIND_DIR_MAG_ABV_CNPY The wind direction measured above the canopy from magnetic north. WIND_SPEED_ABV_CNPY The wind speed measured above the canopy. FRICTION_VELOC_ABV_CNPY The friction velocity above the canopy. AIR_TEMP_ABV_CNPY The air temperature measured above the canopy. RELATIVE_HUM_ABV_CNPY The relative humidity measured above the canopy CRTFCN_CODE The BOREAS certification level of the data. Examples are CPI (Checked by PI), CGR (Certified by Group), PRE (Preliminary), and CPI-??? (CPI but questionable). REVISION_DATE 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 are:Column Name Units ------------------------------ ------------------------------------------------ SITE_NAME [none] DATE_OBS [DD-MON-YY] TIME_OBS [HH.H GMT] SENSIBLE_HEAT_FLUX_ABV_CNPY [Watts][meter^-2] LATENT_HEAT_FLUX_ABV_CNPY [Watts][meter^-2] NET_RAD_ABV_CNPY [Watts][meter^-2] CO2_FLUX_ABV_CNPY [micromoles][meter^-2][second^-1] CO2_CONC_ABV_CNPY [parts per million] DOWN_PPFD_ABV_CNPY [micromoles][meter^-2][second^-1] UP_PPFD_ABV_CNPY [micromoles][meter^-2][second^-1] MOMENTUM_FLUX_ABV_CNPY [newton] [meter^-2] WIND_DIR_MAG_ABV_CNPY [degrees from magnetic North] WIND_SPEED_ABV_CNPY [meters][second^-1] FRICTION_VELOC_ABV_CNPY [meters][second^-1] AIR_TEMP_ABV_CNPY [degrees Celsius] RELATIVE_HUM_ABV_CNPY [percent] CRTFCN_CODE [none] REVISION_DATE [DD-MON-YY]7.3.4 Data Source
The source of the parameter values contained in the data files are:Column Name Data Source ------------------------------ ------------------------------------------------ SITE_NAME [Investigator] DATE_OBS [Investigator] TIME_OBS [Investigator] SENSIBLE_HEAT_FLUX_ABV_CNPY [Gill Solent sonic anemometer for NSA-BRN-1930 site, CSAT3 Campbell sonic for other sites] LATENT_HEAT_FLUX_ABV_CNPY [Closed path Infrared Gas Analyzer for NSA-BRN- 1930 site, Open path Infrared Gas Analyzer for other sites] NET_RAD_ABV_CNPY [Net radiometer] CO2_FLUX_ABV_CNPY [Closed path Infrared Gas Analyzer for NSA-BRN- 1930 site, Open path Infrared Gas Analyzer for other sites] CO2_CONC_ABV_CNPY [Closed path Infrared Gas Analyzer for NSA-BRN- 1930 site, Open path Infrared Gas Analyzer for other sites] DOWN_PPFD_ABV_CNPY [Quantum sensor] UP_PPFD_ABV_CNPY [Quantum sensor] MOMENTUM_FLUX_ABV_CNPY [Gill Solent sonic anemometer for NSA-BRN-1930 site, CSAT3 Campbell sonic for other sites] WIND_DIR_MAG_ABV_CNPY [Gill Solent sonic anemometer for NSA-BRN-1930 site, CSAT3 Campbell sonic for other sites] WIND_SPEED_ABV_CNPY [Gill Solent sonic anemometer for NSA-BRN-1930 site, CSAT3 Campbell sonic for other sites] FRICTION_VELOC_ABV_CNPY [Gill Solent sonic anemometer for NSA-BRN-1930 site CSAT3 Campbell sonic for other sites] AIR_TEMP_ABV_CNPY [thermocouple] RELATIVE_HUM_ABV_CNPY [psychrometer] CRTFCN_CODE [Assigned by BORIS] REVISION_DATE [Assigned by BORIS]
7.3.5 Data Range
The following table gives information about the parameter values found in the data files:Minimum Maximum Missng Unrel Below Data Data Data Data Data Detect Not Column Name Value Value Value Value Limit Cllctd ------------------------------------------------------------------------------- SITE_NAME NSA-BRN-1930 NSA-BRN-1989 None None None None DATE_OBS 11-Aug-99 14-Sep-00 None None None None TIME_OBS 0 23.5 None None None None SENSIBLE_HEAT_FLUX_ -80.365 455.64 -999 None None None ABV_CNPY LATENT_HEAT_FLUX_ABV_ -56.59 368.94 -999 None None None CNPY NET_RAD_ABV_CNPY -87.O3 694.9 -999 None None None CO2_FLUX_ABV_CNPY -15.66 15.431 -999 None None None CO2_CONC_ABV_CNPY 327.11 430.48 -999 None None None DOWN_PPFD_ABV_CNPY -0.30 1991.13 -999 None None None UP_PPFD_ABV_CNPY -0.35 96.45 -999 None None None MOMENTUM_FLUX_ABV_CNPY -2.10 0.09 -999 None None None WIND_DIR_MAG_ABV_ 0 360 -999 None None None CNPY WIND_SPEED_ABV_CNPY .05 10.22 -999 None None None FRICTION_VELOC_ABV_ 0.00 1.45 -999 None None None CNPY AIR_TEMP_ABV_CNPY -5.41 34.39 -999 None None None RH_ABV_CNPY .21 100.91 -999 None None None CRTFCN_CODE CPI CPI None None None None REVISION_DATE 30-Nov-00 30-Nov-00 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. --------------------------------------------------------------------------------
SITE_NAME,DATE_OBS,TIME_OBS,SENSIBLE_HEAT_FLUX_ABV_CNPY,LATENT_HEAT_FLUX_ABV_CNPY, NET_RAD_ABV_CNPY,CO2_FLUX_ABV_CNPY,CO2_CONC_ABV_CNPY,DOWN_PPFD_ABV_CNPY, UP_PPFD_ABV_CNPY,MOMENTUM_FLUX_ABV_CNPY,WIND_DIR_MAG_ABV_CNPY,WIND_SPEED_ABV_CNPY, FRICTION_VELOC_ABV_CNPY,AIR_TEMP_ABV_CNPY,RH_ABV_CNPY,CRTFCN_CODE,REVISION_DATE NSA-BRN-1964,28-May-00,1400,28.9864578,35.4339218,11.61626816,-2.0155973, 370.6107483,3.285819371,-999,-0.3087664,203.9116364,3.1118889,0.555667526, 11.8465862,88.6176147,CPI,28-Dec-00 NSA-BRN-1964,28-May-00,1430,52.702198,41.338665,12.74547348,-2.4076433, 370.0732727,3.614854555,-999,-0.260648,210.7561188,2.3937347,0.510536972, 12.1309137,87.373703,CPI,28-Dec-00 NSA-BRN-1964,28-May-00,1500,40.8094673,30.4141216,8.78569412,-1.405153, 369.855072,2.582177149,-999,-0.2668377,207.1391754,2.5296218,0.516563355, 12.114151,87.424324,CPI,28-Dec-00Return to top of document.
8.2 Data Format
The data file contains numerical and
character fields of varying length separated by commas. There are no spaces
between the fields. Missing fields contain a -999.
9.1.1 Derivation Techniques and Algorithms
None.
9.2 Data Processing Sequence
9.2.1 Processing Steps
None given.9.2.2 Processing Changes
None.
9.3 Calculations
9.3.1 Special Corrections/Adjustments
None9.3.2 Calculated Variables
None.
9.4 Graphs and Plots
None.
10.2 Quality Assessment
10.2.1 Data Validation by SourceReturn to top of document.
Raw flux data were examined for errors associated with malfunctioning instruments. These periods were excluded.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
BORIS staff reviewed these data, modified column names and format, and organized the data by site and month. BORIS staff also worked with the team to document the data set.
11.2 Known Problems with the Data
CO2 fluxes may be underestimated
when the friction velocity is less than 0.2 m/sec. The closed-path IRGA
and long sampling tube resulted in an underestimation of water vapor and
CO2 flux because of the damping of high-frequency fluctuations.
The Solent HS sonic anemometer differs fundamentally in the way it calculates
speed of sound temperature compared to the sonic (ATI) Harvard uses at
NOBS. Gill Instruments conceded a major bug in the HS firmware associated
with this discrepancy. Unfortunately, this discrepancy not only prevented
a valid comparison of sensible heat flux between the OBS and the 70-year
old site, but also puts into question the sensible heat fluxes calculated
at the 70-year old site. Errors in flux data may also be associated with
wind directions coming from behind the tower. See section 6.1 for details.
CO2 concentration numbers are only good ±15ppm because
of the calibration tank specifications.
11.3 Usage Guidance
Please contact the investigators for
permission regarding the use of these data sets.
11.4 Other Relevant Information
None given.
14.2 Software Access
None given.
ORNL DAAC User Services
Oak Ridge National Laboratory
(865) 241-3952
ornldaac@ornl.gov
ornl@eos.nasa.gov
15.2 Procedures for Obtaining Data
BOREAS data may be obtained through
the ORNL DAAC World Wide Web site at http://www.daac.ornl.gov/
[Internet Link] or users may place requests for data by telephone
or by electronic mail.
15.3 Output Products and Availability
Requested data can be provided electronically
on the ORNL DAAC's anonymous FTP site or on various media including, CD-ROMs,
8-MM tapes, or diskettes.
16.2 Film Products
None.
16.3 Other Products
The data are available as tabular American
Standard Code for Information Interchange (ASCII) text files.
17.2 Journal Articles and Study Reports
Goulden, M.L., B.C. Daube, S.M. Fan, D.J. Sutton, A. Bazzaz, J.W. Munger,
and S.C. Wofsy. 1997. Physiological responses of a black spruce forest
to weather, Journal of Geophysical Research 102 (D24):28987,28996.
Kaimal, J.C. and J.E. Gaynor. 1991. Another look at sonic thermometry. Boundary Layer Meteorology. 56:401-410.
Kaimal, J.C., J.E. Gaynor, H.A. Zimmerman, and G.A. Zimmerman. 1990. Minimizing flow distortion errors in a sonic anemometer. Boundary Layer Meteorology. 53:103-115.
Litvak, M.E., Miller, S.D., Wofsy, S., Goulden, M. Comparison of peak growing season whole ecosystem CO2 exchange along a boreal forest chronosequence. (in prepartion)
Schotanus, P., F.T.M. Nieuwstadt, and H.A.R. De Bruin. 1983. Temperature measurement with a sonic anemometer and its application to heat and moisture fluxes. Boundary-Layer Meteorology. 26: 81-93.
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):28731-28770.
17.3 Archive/DBMS Usage Documentation
None.
ASCII - American Standard Code for Information Interchange BOREAS - BOReal Ecosystem-Atmosphere Study BORIS - BOREAS Information System DAAC - Distributed Active Archive Center EOS - Earth Observing System EOSDIS - EOS Data and Information System GMT - Greenwich Mean Time GSFC - Goddard Space Flight Center IRGA - Infrared Gas Analyzer NASA - National Aeronautics and Space Administration NSA - Northern Study Area OBS - Old Black Spruce ORNL - Oak Ridge National Laboratory PANP - Prince Albert National Park PAR - Photosynthetically Active Radiation SSA - Southern Study Area PPFD - Photosynthetic Photon Flux Density UBS - Upland Black Spruce URL - Uniform Resource Locator WMO - World Meteorological OrganizationReturn to top of document.
Litvak, M. E., M. L. Goulden, S. D. Miller, and S. Wofsy. 2001. BOREAS Follow-On FLX-04 Tower Flux and Meteorological Data from NSA Burn Site. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Keywords
BLACK SPRUCE
TOWER FLUX
METEOROLOGY
SENSIBLE HEAT FLUX
LATENT HEAT FLUX
CARBON DIOXIDE FLUX
CARBON DIOXIDE CONCENTRATION
PHOTOSYNTHETIC PHOTON FLUX DENSITY
PHOTOSYNTHETICALLY ACTIVE RADIATION
PPFD
PAR
NET RADIATION
AIR TEMPERATURE
SOIL TEMPERATURE
WIND SPEED