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-02 (Ehleringer / Martinelli)

LBA Dataset ID:

LBA_CDO2_ATMOSPHERE_ISOTOPES

Originator(s):

1. EHLERINGER, J.R.
2. MARTINELLI, L.A.
3. COOK, C.
4. DOMINGUES, T.F.
      5. FLANAGAN, L.
6. BERRY, J.A.
7. OMETTO, J.P.H.B.

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 reports carbon and oxygen stable isotope ratios of atmospheric carbon dioxide (CO2) collected at several forest and pasture sites and in the free troposphere over Amazonia. There are three comma-delimited ASCII files with this data set. This project measured atmospheric CO2 concentrations and isotope signatures at ten different forest and pasture canopy sites across the states of Amazonas, Para, and Rondonia within the Brazilian Amazon between March 1999 and March 2004. Both daytime and nighttime profile samples were collected. Samples of CO2 in the troposphere were collected during aricraft flights over the Amazon/Tapajos Rivers, Flona Tapajos, and pasture/agriculture areas during five days in May 2003 (wet season). Samples were analyzed for carbon and oxygen isotopes of atmospheric CO2. Flights ranged from low altitudes to above the diurnal tropospheric boundary layer. Measurements of carbon and oxygen stable isotope ratios of atmospheric carbon dioxide (CO2 ) are a powerful indicator of large-scale CO2 exchange on land across multiple spatial scales. Stable carbon isotope composition of leaf tissue and CO2 released by respiration (delta r) can be used as an estimate of changes in ecosystem isotopic discrimination that occur in response to seasonal and interannual changes in environmental conditions, and land-use change (forest-pasture conversion). Understanding of carbon dioxide stable isotope composition can play a central role in influencing our understanding of the extent to which terrestrial ecosystems are carbon sinks.

Beginning Date:

1999-03-01

Ending Date:

2004-03-31

Metadata Last Updated on:

2011-05-12

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-02 Carbon and Oxygen Isotopes in Atmospheric CO2 in the Amazon: 1999-2004 :  http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1011

Documentation/Other Supporting Documents:

LBA-ECO CD-02 Carbon and Oxygen Isotopes in Atmospheric CO2 in the Amazon: 1999-2004 :  http://daac.ornl.gov/LBA/guides/CD02_Atmosphere_CO2_Isotopes.html

Citation Information - Other Details:

Ehleringer, J., L.A. Martinelli, C. Cook, T.F. Domingues, L. Flanagan, J. Berry, and J.P. Ometto. 2011. LBA-ECO CD-02 Carbon and Oxygen Isotopes in Atmospheric CO2 in the Amazon: 1999-2004. 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/1011

Keywords - Theme:

Parameter Topic Term Source Sensor
CARBON DIOXIDE BIOSPHERE ECOLOGICAL DYNAMICS FIELD INVESTIGATION CO2 SENSOR
STABLE ISOTOPES BIOSPHERE ECOLOGICAL DYNAMICS LABORATORY MASS SPECTROMETER

Uncontrolled Theme Keyword(s):  CANOPY ATMOSPHERE, CARBON DIOXIDE CONCENTRATION, CARBON ISOTOPE, OXYGEN ISOTOPE, STABLE ISOTOPE, TROPOSPHERE

Keywords - Place (with associated coordinates):

Region
(click to view profile)
Site
(click to view profile)
North South East West
  RONDONIA AMAZONAS (MANAUS) PARA WESTERN (SANTAREM) 1.00000 -10.76180 54.57920 -62.35720

Related Publication(s):

Ehleringer, J.R., D.R. Bowling, L.B. Flanagan, J. Fessenden, B. Helliker, L.A. Martinelli, and J.P. Ometto. 2002. Stable isotopes and carbon cycle processes in forests and grasslands. Plant Biology 4(2):181-189.

Ometto, J. P. H. B., L. B. Flanagan, L. A. Martinelli, M. Z. Moreira, N. Higuchi, and J. R. Ehleringer. 2002. Carbon isotope discrimination in forest and pasture ecosystems of the Amazon Basin, Brazil, Global Biogeochem. Cycles, 16(4), 1109, doi:10.1029/2001GB001462

Ometto, J.P.H., L.B. Flanagan, L.A. Martinelli, and J.R. Ehleringer. 2005. Oxygen isotope ratios of waters and respired CO2 in Amazonian forest and pasture ecosystems. Ecological Applications 15(1):58-70.

Data Characteristics (Entity and Attribute Overview):

Data Characteristics:

The data on atmospheric CO2 concentrations and isotope signatures include collections between March 1999 and March 2004 made at ten different sites in the states of Amazonas, Para and Rondonia within the Brazilian Amazon. Actual time and location for each data point are noted in the data files. Forest and pasture data are in separate comma-delimited ASCII files: CD02_Stable_Isotope_Air_Forest.csv and CD02_Stable_Isotope_Air_Pasture.csv



Carbon and oxygen isotopes of tropospheric CO2 were collected by aircraft during five days in May 2003 (wet season) on flights over the Amazon/Tapajos Rivers, Flona Tapajos and pasture/agriculture areas. Flights ranged from low altitudes to above the diurnal tropospheric boundary layer.



Data are in one comma-delimited ASCII file: CD02_Stable_Isotope_Air_Troposphere.csv



File #1: CD02_Stable_Isotope_Air_Forest.csv

Column Heading Units/format Description

1 Region Sampling region

2 Site Sampling site

3 Longitude degrees Location in decimal degrees

4 Latitude degrees Location in decimal degrees

5 Ecosystem Ecosystem vegetation type: Forest

6 Year YYYY Sampling year

7 Month MM Sampling month

8 Time HHMM Sampling time 24 hour clock (local time)

9 Height meters Sampling height in meters (m)

10 CO2_conc ppm Atmospheric CO2 concentration, measured with Licor 6200 in the field or a Licor 6252 in the field

11 Inverse_CO2_conc 1/ppm Calculated inverse of atmospheric CO2 concentration

12 delta_13C parts per mil Isotopic ratio of 13C/12C in carbon dioxide referenced to PDB, measured with continuous flow on Finigan Delta Plus at CENA

13 delta_18O parts per mil Isotopic ratio of 18O/16O in carbon dioxide referenced to SMOW, measured with continuous flow on Finigan Delta Plus at CENA



Note: 9999 indicates missing data ( note this value is used rather than the more common -9999 due to the large number of negative values for delta variables)

Sampling year, month, and time only are reported; no sampling day is provided.

Example data records:



Region,Site,Longitude,Latitude,Ecosystem,Year,Month,Time,Height, CO2_conc,Inverse_CO2_conc,delta_13C,delta_18O

Manaus,ZF2 km 14,-2.589,-60.1152,Forest,1999,3,721,0.3,467.5,0.00214,-13.1,39.8

Manaus,ZF2 km 14,-2.589,-60.1152,Forest,1999,3,721,5,445,0.00225,-12.1,40.7

...

Santarem,SECA Control,-2.857,-54.959,Forest,1999,3,1650,26,363.7,0.00275,-8.9,41.6

Santarem,SECA Control,-2.857,-54.959,Forest,1999,3,1703,16,360,0.00278, 8.8,41.6

...

Manaus,ZF2 km 14,-2.589,-60.1152,Forest,1999,5,614,0.5,585.3,0.00171,-15.3,34.9

Manaus,ZF2 km 14, 2.589,-60.1152,Forest,1999,5,603,5,538.4,0.00186,-14.8,35.4

...

Rondonia,Rebio,-10.0832,-61.9309,Forest,2000,9,1130,52, 71.6,0.00269,-8.5,40.1

Rondonia,Rebio,-10.0832,-61.9309,Forest,2000,9,1200,52,378.6,0.00264,-8.7,39.5

...

Santarem,SECA Dry,-2.857,-54.959,Forest,2004,3,2145,5,430.6,0.00232,-11.3,38.5

Santarem,SECA Dry,-2.857,-54.959,Forest,2004,3,2150, .2,498.2,0.00201,-13.8,36.4



File #2: CD02_Stable_Isotope_Air_Pasture.csv



Column Heading Units/format Description

1 Region Sampling region

2 Site Sampling site

3 Longitude degrees Location in decimal degrees

4 Latitude degrees Location in decimal degrees

5 Ecosystem Ecosystem vegetation type: Pasture

6 Year YYYY Sampling year

7 Month MM Sampling month

8 Time HHMM Sampling time 24 hour clock (local time)

9 Height meters Sampling height in meters (m)

10 CO2_conc ppm Atmospheric CO2 concentration, measured with Licor 6200 in the field or a Licor 6252 in the field

11 Inverse_CO2_conc 1/ppm Calculated inverse of atmospheric CO2 concentration

12 delta_13C parts per mil Isotopic ratio of 13C/12C in carbon dioxide referenced to PDB, measured with continuous flow on Finigan Delta Plus at CENA

13 delta_18O parts per mil Isotopic ratio of 18O/16O in carbon dioxide referenced to SMOW, measured with continuous flow on Finigan Delta Plus at CENA

Note: 9999 indicates missing data ( note this value is used rather than the more common -9999 due to the large number of negative values for delta variables)

Sampling year, month, and time only are reported; no sampling day is provided.

Example data records:





Region,Site,Longitude,Latitude,Ecosystem,Year,Month,Time,Height,CO2_conc,Inverse_CO2_conc,delta_13C,delta_18O

Manaus,ZF3,-2,-59,Pasture,1999,5,1200,0.27,469.6,0.00213,-12.1,36.6

Manaus,ZF3,-2,-59,Pasture,1999,5,1740,0.27,467.2,0.00214,-12,37.5

...

Rondonia, Rebio,-10.7618,-62.3572,Pasture,2000,2,1545,0.6, 52.8, 0.00283,-7.9,38.9

Rondonia, Rebio, 10.7618,-62.3572,Pasture,2000,2,1545, 0.2,375.3,0.00266,-8.3,38.2

...

Santarem, km 77,-3.0202,-54.959,Pasture,1999,5,1440,0.84,361.7,0.00276,-8.4,43

Santarem, km 77,-3.0202,-54.959,Pasture,1999,5,1440,0.27,391.5,0.00255,-8.4,43.2

...

Santarem, Mojui, -2.76667,-54.57917,Pasture,2002,6,2107, .02,746.8,0.00134,-16.3,38

Santarem, Mojui, -2.76667,-54.57917,Pasture,2002,6,2104,1,628.4,0.00159,-16.3,39.5

...



File #3: CD02_Stable_Isotope_Air_Troposphere.csv

Column Heading Units/format Description

1 Row Row number

2 Flask_ID Identification number for each air sample flask

3 Local_time HH:MM:SS Time (HH:MM:SS) of sampling in local time ( GMT -4)

4 Flight_time Duration of flight in minutes

5 Date YYYYMMDD Sample date (YYYYMMDD)

6 GPS_date YMMDD Date (YMMDD) recorded by GPS

7 GPS_time HHMMSS Time (HHMMSS) recorded by GPS unit in GMT time

8 Latitude degrees Sampling latitude in decimal degrees

9 Longitude degrees Sampling longitude in decimal degrees

10 Altitude masl Sampling altitude in meters above sea level

11 Theta K Potential temperature calculated in degrees Kelvin

12 Atm_press kPa Atmospheric pressure measured in kilopascals

13 CO2_ref ppm Measured CO2 concentration in parts per million for the reference cell of the Licor IRGA

14 CO2_sample ppm Measured CO2 concentration in parts per million for the sample cell of the Licor IRGA

15 RH_outside % Relative humidity (%) measured outside the window of plane

16 T_outside degrees C Temperature in degrees C measured outside the window of the plane

17 CO2_calc ppm Atmospheric CO2 concentration in parts per million calculated from Licor measurements =CO2_ref-CO2_sample+350.3

18 Comment Observation on the flight

19 Flask_CO2 ppm CO2 concentration in sample flasks, expressed as parts per million, measured independently in the lab

20 Delta_13C per mil Isotopic ratio of 13C/12C in carbon dioxide per mil from flasks referenced to PDB, measured with continuous flow on Finigan Delta Plus at CENA

21 Delta_18O per mil Isotopic ratio of 18O/16O in carbon dioxide per mil from flasks referenced to SMOW, measured with continuous flow on Finigan Delta Plus at CENA

Missing data values are represented by 9999



Example data records:

Row,Flask_ID,Local_time,Flight_time,Date,GPS_date,GPS_time,Latitude,Longitude,Altitude,Theta,

Atm_press,CO2_ref,CO2_sample,RH_outside,T_outside,CO2_calc,Comment,Flask_CO2,Delta_13C,Delta_18O

1,N55,16:28:02,847,20030526,30526,202652,-2.32594,-54.9184,326,305.22,

97.17,387.69,357.77,73,28.6,380.22,Flight #1,380.14,-8.26,41.69

2,N62,16:33:40,1185,20030526,30526,203230,-2.18228,-54.919,299,305.41,

97.41,386.65,357.91,74.2,29,379.04,Flight #2,379.6,-8.26,41.5

3,N70,16:38:47,1492,20030526,30526,203737,-2.21994,-54.8018,327,305.63,

97.12,386.97,358.22,69.2,28.9,379.05,Flight #3,549.59,-13.11,38.85

4,N18,16:51:55,2280,20030526,30526,205045,-2.59789,-54.8356,318,304.59,

97.25,385.09,358.42,83.4,28,376.97,Flight #4,376.08,-8.13,41.89

...

Data Application and Derivation:

Measurements of carbon and oxygen stable isotope ratios of atmospheric CO2 are a powerful indicator of large-scale CO2 exchange on land across multiple spatial scales. Stable carbon isotope composition of leaf tissue and CO2 released by respiration (delta r) can be used as an estimate of changes in ecosystem isotopic discrimination that occur in response to seasonal and interannual changes in environmental conditions, and land-use change (forest-pasture conversion). Understanding of carbon dioxide stable isotope composition can play a central role in influencing our understanding of the extent to which terrestrial ecosystems are carbon sinks.

Quality Assessment (Data Quality Attribute Accuracy Report):

Quality Assessment:

Standard samples were run along with the field samples for all analyzes to check the calibration of the instruments. There are no known problems with the data.

Process Description:

Data Acquisition Materials and Methods:

The data on atmospheric CO2 concentrations and isotope signatures include collections between March 1999 and March 2004 made at 10 different sites in the states of Amazonas, Para and Rondonia within the Brazilian Amazon. Actual time and location for each data point are noted in the data files. Carbon and oxygen isotopes of atmospheric carbon dioxide collected during 5 days in May 2003 (wet season) on flights over the Amazon/Tapajos Rivers, Flona Tapajos and pasture/agriculture areas. Flights ranged from low altitudes to over the diurnal tropospheric boundary layer.



Atmospheric sampling within the forest/pasture canopies:

At each site we collected samples of air at intervals during a 1-2 day period. Sample lines (Dekoron tubing, 6 mm outer diameter) were located at different heights in the canopy by attachment to a scaffold tower (forest) or wooden pole (pasture). A small filter was placed over the inlet to prevent the entry of insects. Air was pulled down through the tubing, through a desiccant tube containing magnesium perchlorate, and into glass flasks (100 ml, see Ehleringer and Cook, 1998) by a battery-operated pump (Capex V2X, Charles Austin, West Byfleet, Surrey, UK). Air was passed through the flasks for approximately 7-10 minutes before the high vacuum stopcocks on the flask were closed. The flask was then returned to the lab for stable isotope analyzes and CO2 concentration measurement. Sampling times were chosen to obtain diurnal variation of concentrations and isotopes.



Tropospheric measurements:

Samples were collected during 5 days in May 2003 (wet season) on flights over the Amazon/Tapajos Rivers, FLONA Tapajos and pasture/agriculture areas. Flights ranged from low altitudes to over the diurnal tropospheric boundary layer. Samples were collected in a tube attached to the wing of the small plane. Duplicate samples were collected in sample flasks and analyzed for CO2 concentration, delta 13C and delta 18O of CO2 at CENA.



Sample analyses:

CO2 concentrations were measured with Licor 6200 in the field and Licor 6252 in the lab at CENA/USP in Piracicaba 13C/12C; 18O/16O - Measured with continuous flow on Finigan MAT Delta Plus (CENA/USP).

References:

Ehleringer, J.R., and C.S. Cook. 1998. Carbon and oxygen isotope ratios of ecosystem respiration along an Oregon conifer transect: preliminary observations based upon small-flask sampling. Tree Physiol. 18:513-519



Flanagan, L.B., D.S. Kubien, and J.R. Ehleringer, Spatial and temporal variation in the carbon and oxygen stable isotope ratio of respired CO2 in a boreal forest ecosystem, Tellus, 51B, 367-384, 1999.

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

NASA logo
ORNL DAAC
Get Acrobat Reader