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 separated file.
Km 83 logged tower site in Tapajos National Forest
Cite this data set as follows:
Miller, S., M. 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
The LBA Data and Publication Policy [http://daac.ornl.gov/LBA/lba_data_policy.html] is in effect for a period of five (5) years from the date of archiving and should be followed by data users who have obtained LBA data sets from the ORNL DAAC. Users who download LBA data in the five years after data have been archived must contact the investigators who collected the data, per provisions 6 and 7 in the Policy.
This data set was archived in October of 2009. Users who download the data between October 2009 and September 2014 must comply with the LBA Data and Publication Policy.
Data users should use the Investigator contact information in this document to communicate with the data provider. Alternatively, the LBA Web Site [http://lba.inpa.gov.br/lba/] in Brazil will have current contact information.
Data users should use the Data Set Citation and other applicable references provided in this document to acknowledge use of the data.
Project: LBA (Large-Scale Biosphere-Atmosphere Experiment in the Amazon)
LBA Science Component: Carbon Dynamics
Team ID: CD-04 (Goulden / Rocha)
The investigators were Goulden, Prof. Michael L.; Miller, Dr. Scott Dennis and Rocha, Prof. Humberto Ribeiro da . You may contact Miller, Dr. Scott D. (firstname.lastname@example.org)
LBA Data Set Inventory ID: CD04_CO2_Profiles
Atmospheric carbon dioxide concentrations measured at 12 levels between 10 cm and 64 m at the logged tower site in Tapajos National Forest (km 83). Data were collected over 3.5 years between June 2000-March 2004.
Related Data Set:
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:
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.
File Contents / Variable Descriptions:
|1||exp_day||experiment day (0 = January 1, 2000, 00:00 hours)|
|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||micromoles/m2/s||CO2 storage flux below 64 m|
This data set is not gap-filled.
Missing data are represented by -999
Example Data Record:
|Site (Region)||Westernmost Longitude||Easternmost Longitude||Northernmost Latitude||Southernmost Latitude||Geodetic Datum|
|Para Western (Santarem) - km 83 Logged Forest Tower (Para Western (Santarem))||-54.96889||-54.96889||-3.01806||-3.01806||World Geodetic System, 1984 (WGS-84)|
Platform/Sensor/Parameters measured include:
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.
This data set 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 the related data set Miller et al. (2009).
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).
These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
Telephone: +1 (865) 241-3952