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Title: Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2

Abstract

The main objective of this project was to continue research to develop carbon cycle relationships related to the land biosphere based on remote measurements of atmospheric CO2 concentration and its isotopic ratios 13C/12C, 18O/16O, and 14C/12C. The project continued time-series observations of atmospheric carbon dioxide and isotopic composition begun by Charles D. Keeling at remote sites, including Mauna Loa, the South Pole, and eight other sites. Using models of varying complexity, the concentration and isotopic measurements were used to study long-term change in the interhemispheric gradients in CO2 and 13C/12C to assess the magnitude and evolution of the northern terrestrial carbon sink, to study the increase in amplitude of the seasonal cycle of CO2, to use isotopic data to refine constraints on large scale changes in isotopic fractionation which may be related to changes in stomatal conductance, and to motivate improvements in terrestrial carbon cycle models. The original proposal called for a continuation of the new time series of 14C measurements but subsequent descoping to meet budgetary constraints required termination of measurements in 2007.

Authors:
;
Publication Date:
Research Org.:
University of California, San Diego / Scripps Institution of Oceanography
Sponsoring Org.:
USDOE - Office of Science (SC-23, BER)
OSTI Identifier:
1032487
Report Number(s):
DOE/ER64362 Final
TRN: US201208%%495
DOE Contract Number:  
FG02-07ER64362
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ABUNDANCE; AMPLITUDES; BIOSPHERE; CARBON CYCLE; CARBON DIOXIDE; CARBON SINKS; FRACTIONATION; CO2; atmospheric carbon dioxide; carbon and oxygen isotopes of CO2; global carbon cycle; terrestrial biosphere; fossil fuel emissions; ocean carbon sources and sinks

Citation Formats

Piper, Stephen C, and Keeling, Ralph F. Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2. United States: N. p., 2012. Web. doi:10.2172/1032487.
Piper, Stephen C, & Keeling, Ralph F. Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2. United States. https://doi.org/10.2172/1032487
Piper, Stephen C, and Keeling, Ralph F. Tue . "Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2". United States. https://doi.org/10.2172/1032487. https://www.osti.gov/servlets/purl/1032487.
@article{osti_1032487,
title = {Study of the Role of Terrestrial Processes in the Carbon Cycle Based on Measurements of the Abundance and Isotopic Composition of Atmospheric CO2},
author = {Piper, Stephen C and Keeling, Ralph F},
abstractNote = {The main objective of this project was to continue research to develop carbon cycle relationships related to the land biosphere based on remote measurements of atmospheric CO2 concentration and its isotopic ratios 13C/12C, 18O/16O, and 14C/12C. The project continued time-series observations of atmospheric carbon dioxide and isotopic composition begun by Charles D. Keeling at remote sites, including Mauna Loa, the South Pole, and eight other sites. Using models of varying complexity, the concentration and isotopic measurements were used to study long-term change in the interhemispheric gradients in CO2 and 13C/12C to assess the magnitude and evolution of the northern terrestrial carbon sink, to study the increase in amplitude of the seasonal cycle of CO2, to use isotopic data to refine constraints on large scale changes in isotopic fractionation which may be related to changes in stomatal conductance, and to motivate improvements in terrestrial carbon cycle models. The original proposal called for a continuation of the new time series of 14C measurements but subsequent descoping to meet budgetary constraints required termination of measurements in 2007.},
doi = {10.2172/1032487},
url = {https://www.osti.gov/biblio/1032487}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {1}
}