NOTICE -- The LBA-ECO Project website is no longer being supported.  This archive is a snapshot, as it existed in 2013, of the LBA-ECO website, maintained by NASA Goddard Space Flight Center, and now archived at the ORNL DAAC.  Links to external websites may be inactive. Final data products from the LBA project can be found at the ORNL DAAC.
banner
banner banner banner banner banner banner
banner banner banner banner banner banner banner
home aboutlibrarynews archivecontacts banner

spacer
banner
Investigations
Overview
Abstracts & Profiles
Publications
Research Sites
Meetings
Synthesis Groups
LBA-HYDROMET
LBA-Air-ECO
Logistics
Overview
Field Support
Travel
Visa
Shipping
Data
  Overview
Find LBA Data
Investigator Checklist
Process & Policy
Documentation & Archive
Training & Education
  Overview
Activities Summary
T&E Goals
Student Opportunities
  Folha Amazônica
 
spacer

Investigation:

CD-10 (Wofsy / Kirchhoff / Camargo / A. Nobre)

LBA Dataset ID:

CD10_CO_TAPAJOS

Originator(s):

1. BOIAN, C.
2. KIRCHHOFF, V.W.J.H.
3. MUNGER, J.W.
      4. SALESKA, S.R.
5. WOFSY, S.C.

Point(s) of Contact:

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

Dataset Abstract:

This data set contains a single comma separated text file (*.csv) of half-hourly average CO mixing ratios measured from 2001/04/18 to 2003/08/29 in the old-growth upland forest at the Para Western (Santarem) - km 67, Primary Forest Tower Site. This site is in the Tapajos National Forest located in north central Brazil. CO concentrations were measured in air drawn from above the canopy top of tower (approx. 64 meters) using a TEI 48CTL instrument modified for increased stability and sensitivity. The sensor was frequently zeroed by passing ambient air over a CO oxidation catalyst. The span was checked 4 times daily by sampling calibration gases at 100 and 500 ppb. Time in the file is given in UTC (decimal date) at the start of each half hour interval (Boian et al., 2006). Associated meteorological parameters, CO2 concentrations and micrometerological fluxes are available in LBA-ECO CD-10 CO2 and H2O Eddy Flux Data at km 67 Tower Site, Tapajos National Forest.

Beginning Date:

2001-04-18

Ending Date:

2003-08-29

Metadata Last Updated on:

2008-06-13

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-10 CO Concentrations at km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=856

Documentation/Other Supporting Documents:

LBA-ECO CD-10 CO Concentrations at km 67 Tower Site, Tapajos National Forest:  http://daac.ornl.gov/LBA/guides/CD10_CO_Tapajos.html

Citation Information - Other Details:

Boian, C., V. W. J. H. Kirchhoff, J. W. Munger, S. R. Saleska, S. C. Wofsy. 2007. LBA-ECO CD-10 CO Concentrations at km 67 Tower Site, Tapajos National Forest. 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. doi:10.3334/ORNLDAAC/856

Keywords - Theme:

Parameter Topic Term Source Sensor
CARBON MONOXIDE ATMOSPHERE ATMOSPHERIC CHEMISTRY TOWER IRGA

Uncontrolled Theme Keyword(s):  CARBON MONOXIDE

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
Pará Western (Santarém) km 67 Primary Forest Tower Site -2.85700 -2.85700 -54.95900 -54.95900

Related Publication(s):

Boian, C., V.W.J.H. Kirchhoff, W.J. Munger, S.R. Saleska, and S.C. Wofsy. 2006. Very High CO Mixing Ratios at a Primary Forest Site. Revista Brasileira de Meteorologia 21:20-28

Saleska, S.R., S.D. Miller, D.M. Matross, M.L. Goulden, S.C. Wofsy, H.R. da Rocha, P.B. de Camargo, P. Crill, B.C. Daube, H.C. de Freitas, L. Hutyra, M. Keller, V. Kirchhoff, M. Menton, J.W. Munger, E.H. Pyle, A.H. Rice, and H. Silva. 2003. Carbon in amazon forests: Unexpected seasonal fluxes and disturbance-induced losses. Science 302(5650):1554-1557.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

Data are provided in a comma delimited ASCII file: CO_km67_0103_30m.csv



Data File Description:



Column Heading Description



Column 1 Cum_Date Cumulative date (UTC, decimal) starts from January 1, 2001 - 2003



Column 2 Date Day of year (UTC, decimal) starts from January 1, 2001



Column 3 CO Half-hourly average concentration (ppb)



Column 4 Std_Dev Standard deviation of half-hourly concentration (ppb)



Date/time in the file is given in UTC at the start of each half hour interval.



Missing values are represented as -999.



Sample Data Records:



Prepared by Bill Munger (jwm@io.harvard.edu),,,

Last revised 6 March 2007,,,

Missing or rejected data reported as -999,,,

Day of year (UTC, decimal) starts from January 1, 2001,,,

Half-hourly average CO concentrations in ppb,,,

Cum_Date,Date,CO,Std_Dev

108.5833,108.5833,-999,-999

108.6042,108.6042,85.9,3.3

108.625,108.625,86,3.3

108.6458,108.6458,87.4,2.9

...

971.604,241.604,115.1,6.48

971.625,241.625,124.4,9.09

971.646,241.646,127.4,7.84

971.667,241.667,122.1,8.75

Data Application and Derivation:

This data set contains half-hourly average CO mixing ratios measured at the km67 eddy flux tower site in the Tapajos Forest near Santarem.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Detection Limits



Based on 2 times the standard deviation of the mean of zero measurements, the minimum detection limit is on the order of 10 ppb.



Resolution/Precision



Based on the standard deviations of the means of replicate sample and calibration gas measurmements, the minimum resolution is 10 ppb or better.

Process Description:

Data Acquisition Materials and Methods:

Thermo Environmental Instruments model 48CTL analyzer inlet is located above the forest canopy at top of tower.



Measurements



The CO concentration data was determined using gas-filter-correlation IR absorption on a Thermo-Environmental Instruments 48CTL. Ambient air was dried by condensing water vapor at 2 deg C. Background instrument zero signal was determined every 15 minutes by removing CO from ambient air using a Sofnocat oxidizing catalyst. Instrument gain was determined by calibration with standards at about 100 ppb and 500 ppb CO.



Processing Steps



Raw data were initially separated into ambient sample, zero, low calibration, and high calibration, and transitional. Transitional data representing data immediately after switching modes were not used. 1-minute averages were computed for the zero, calibration and ambient signals. Zeros were subtracted from ambient and calibration signals to generate difference signals. The two calibration values were used to construct a mean calibration curve, which was then used to convert the ambient signals to concentration. 1-minute average ambient concentrations were then further averaged to the half-hourly reported values.

References:

Saleska, S. R., S. D. Miller, D. M. Matross, M. L. Goulden, S. C. Wofsy, H. R. da Rocha, P. B. de Camargo, P. Crill, B. C. Daube, H. C. de Freitas, L. Hutyra, M. Keller, V. Kirchhoff, M. Menton, J. W. Munger, E. H. Pyle, A. H. Rice, H. Silva, (2003) Carbon in Amazon forests: unexpected seasonal fluxes and disturbance-induced losses, Science, 302, 1554.



Boian, C., V.W.J.H. Kirchhoff, W. Munger, S.R. Saleska, S.C. Wofsy (2006) Very High CO Mixing Ratios at a Primary Forest Site, Revista Brasileira de Meteorologia, 21, 20-28.

Skip navigation linksHOME | ABOUT | LIBRARY | NEWS ARCHIVE | CONTACTS | INVESTIGATIONS | LOGISTICS | DATA |TRAINING & EDUCATION

NASA logo
ORNL DAAC
Get Acrobat Reader