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Investigation:

CD-04 (Goulden / Rocha)

LBA Dataset ID:

LBACD04CO2PROFILES

Originator(s):

1. MILLER, S.D.
2. GOULDEN, M.L.
      3. DA ROCHA, H.R.

Point(s) of Contact:

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Dataset Abstract:

Atmospheric carbon dioxide profiles were measured at 12 levels up to 64 m at the km 83 logged tower site in Tapajos National Forest, Santarem, Para, Brazil. Data were collected over 3.5 years between June 2000-March 2004. An infra-red gas analyzer sequentially measured the concentration of CO2 at 12 heights (0.1, 0.35, 0.7, 1.4, 3, 6, 10.7, 20, 35, 40, 50, 64 m above the ground) on the tower every 48 minutes. The data, reported on a 30 minute interval, are provided in one single comma delimited file.

Beginning Date:

2000-07-01

Ending Date:

2004-03-12

Metadata Last Updated on:

2009-11-10

Data Status:

Archived

Access Constraints:

PUBLIC

Data Center URL:

http://daac.ornl.gov/

Distribution Contact(s):

ORNL DAAC User Services Office Oak Ridge National Laboratory Oak Ridge, Tennessee 37 (ornldaac@ornl.gov)

Access Instructions:

PUBLIC

Data Access:

IMPORTANT: The LBA-ECO Project website is no longer being supported. Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC. Please follow the fair use guidelines found in the dataset documentation when using or citing LBA data.
Datafile(s):

LBA-ECO CD-04 CO2 Profiles, km 83 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=947

Documentation/Other Supporting Documents:

LBA-ECO CD-04 CO2 Profiles, km 83 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/LBA/guides/CD04_CO2_Profiles.html

Citation Information - Other Details:

Miller, S.D., M.L. Goulden, and H.R. da Rocha. 2009. LBA-ECO CD-04 CO2 Profiles, km 83 Tower Site, Tapajos National Forest. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/947

Keywords - Theme:

Parameter Topic Term Source Sensor
CARBON DIOXIDE ATMOSPHERE ATMOSPHERIC CHEMISTRY TOWER IRGA (INFRARED GAS ANALYZER)
CARBON DIOXIDE FLUX ATMOSPHERE ATMOSPHERIC CHEMISTRY FLUX TOWER SONIC ANEMOMETER

Uncontrolled Theme Keyword(s):  CARBON DIOXIDE, CO2, FLUX TOWER , KILOMETER 83, LOGGED SITE, PROFILE, STORAGE FLUX, TAPAJOS FOREST

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Pará Western (Santarém) km 83 Logged Forest Tower Site -3.01700 -3.01700 -54.97070 -54.97070

Related Publication(s):

Goulden, M.L., S.D. Miller, H.R. da Rocha, M.C. Menton, H.C. de Freitas, A.M.E.S. Figueira, and C.A.D. de Sousa. 2004. Diel and seasonal patterns of tropical forest CO2 exchange. Ecological Applications 14(4):S42-55.

Miller, S.D., M.L. Goulden, M.C. Menton, H.R. da Rocha, H.C. de Freitas, A.M.E.S. Figueira, and C.A.D. de Sousa. 2004. Biometric and micrometeorological measurements of tropical forest carbon balance. Ecological Applications 14(4):S114-126.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data were all collected within the Tapajos National Forest, 83 km south of the city of Santarem, Para. Data are presented in one ASCII file: CD04_km83_CO2_profiles.csv.



There are 19 columns, representing measured or calculated quantities, separated by commas. There are 64992 records (rows), each corresponding to a 30 minute interval for a total 1354 days beginning June 29, 2000 and ending March 11, 2004. The first timestamp is experiment day 181, or June 29, 2000. The last timestamp is day 1535, or March 11, 2004, the day that a tree fell on the tower. The data are not gap-filled.



Data Quality Note: Please note that the data file has a few additional records-before and after the stated timestamps. Users may exclude records as appropriate for their analyses.





CD04_km83_CO2_profiles.csv:

File Contents / Variable Descriptions:

Column Heading Units/Format Description

1 exp_day experiment day (0 = January 1, 2000, 00:00 hours)

2 year yyyy year

3 month mm month

4 day dd day

5 hour hh hour at start of sampling period (GMT:24 hour clock)

6 minute mm minute at start of sampling period (GMT)

7 CO2_10cm ppm atmospheric CO2 concentration at 10 cm height

8 CO2_35cm ppm atmospheric CO2 concentration at 35 cm height

9 CO2_70cm ppm atmospheric CO2 concentration at 70 cm height

10 CO2_1_4m ppm atmospheric CO2 concentration at 1.4 m height

11 CO2_3m ppm atmospheric CO2 concentration at 3 m height

12 CO2_6m ppm atmospheric CO2 concentration at 6 m height

13 CO2_10_7m ppm atmospheric CO2 concentration at 10.7 m height

14 CO2_20m ppm atmospheric CO2 concentration at 20 m height

15 CO2_35m ppm atmospheric CO2 concentration at 35 m height

16 CO2_40m ppm atmospheric CO2 concentration at 40 m height

17 CO2_50m ppm atmospheric CO2 concentration at 50 m height

18 CO2_64m ppm atmospheric CO2 concentration at 64 m height

19 fstor_64m um/m2/s CO2 storage flux below 64m





This dataset is not gap-filled.

Missing data are represented by -999.



Example Data Records: exp_day,year,month,day,hour,minute,CO2_10cm,CO2_35cm,CO2_70cm,CO2_1_4m,CO2_3m,CO2_6m,CO2_10_7m,CO2_20m,CO2_35m,CO2_40m,CO2_50m,CO2_64m,fstor_64m

174,2000,6,22,0,0,-999,-999,-999,-999,-999,-999,-999,-999,-999,-999,-999,-999,-999

174.020833,2000,6,22,0,30,486.88,474.91,475.56,472.37,467.14,463.9,462.86,428.48,410.14,401.06,399.01,399.01,12.46

174.041667,2000,6,22,1,0,494.69,489.22,483.65,474.13,472.1,470.84,466.25,469.44,410.11,403.76,399.81,397.55,3.54

174.0625,2000,6,22,1,30,499.45,497.69,489.03,479.13,477.31,476.18,471.66,474.54,410.08,406.35,400.43,397.14,7.01

174.083333,2000,6,22,2,0,501.03,502.38,492.62,484.52,482.06,480.54,479.51,480.55,425.48,407.84,400.47,397.3,6.59

174.104167,2000,6,22,2,30,502.62,496.91,491.19,489.86,486.3,484.1,487.74,484.92,441.61,409.34,400.51,397.46,3.69

174.125,2000,6,22,3,0,503.58,495.09,493.36,491.94,488.75,486.78,488.66,482.92,457.73,410.83,400.54,397.6,-2.72

174.145833,2000,6,22,3,30,503,498.28,498.42,493.02,491.61,490.74,491.68,487.52,438.88,405.65,400.12,397.57,-2.2

Data Application and Derivation:

The amount of CO2 stored beneath the CO2 measurement inlets (64 m) can be calculated by integrating the CO2 profile between 0 and 64 m. The storage flux was then calculated by differentiating this quantity with respect to time.



Analysis of eddy covariance observations provides information useful for identifying which physiological and physical processes play dominant roles in controlling CO2 exchange. In turn, this information contributes to the development and improvement of models of ecosystem-atmosphere CO2 exchange and to understanding which processes are particularly sensitive to future change.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

This dataset is not gap-filled. Missing values or data that were flagged as

unreliable either by an objective algorithm or subjective inspection have been

given a value of -999. Please note that gap-filled CO2 storage flux data are available in a related data set.

Process Description:

Data Acquisition Materials and Methods:

An infra-red gas analyzer (IRGA, LI-COR LI7000 or, before Dec. 2000, a LI800, Lincoln NE) sequentially measured the densities of CO2 and H2O at 12 altitudes (0.1, 0.35, 0.7, 1.4, 3, 6, 10.7, 20, 35, 40, 50, 64 m above the ground) every 48 minutes. Four slpm (standard liters per minute) of air was drawn through a 2 micron filter at each altitude, down 5.5-mm inner-diameter polyethylene lined tubing (Furon Dekabon 1300), through a solenoid manifold in an enclosure at the base of the tower (Parker General Valve, Fairfield NJ), into the equipment hut, and through the IRGA cell. The average CO2 and H2O mixing rations at each level were calculated during the last minute of each 4-minute sampling interval, and observations were then interpolated to each half-hour to synchronize with the eddy flux measurements.



The pressure in the IRGA cell was actively controlled at 83 kPa (MKS Instruments, Andover MA). The IRGA was calibrated for CO2 and water vapor daily by sequentially sampling purge air, CO2 standard in air (+/-1% Scott Marin, Riverside CA), CO2 free air (Scott Marin, Riverside CA), and 16 degree C dew point air (LI-COR LI610, Lincoln NE).

References:

none cited

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