Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C
We study the applicability of the Farquhar model for carbon isotopic discrimination (change in carbon iso-topic composition from air CO2 to tree-ring cellulose) in C3 plants to trees growing in the field. Two new carbon isotope datasets from Himalayan conifers with published data from another eight...
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ftmoes:oai:moeseprints.incois.gov.in:941 2023-05-15T16:39:13+02:00 Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C Bose, T Chakraborty, S Borgaonkar, H Sengupta, S Ramesh, R 2014-09 http://moeseprints.incois.gov.in/941/ http://www.currentscience.ac.in/Volumes/107/06/0971.pdf unknown Indian Academy of Sciences Bose, T and Chakraborty, S and Borgaonkar, H and Sengupta, S and Ramesh, R (2014) Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C. Current Science, 107 (6). pp. 971-982. Meteorology and Climatology Article PeerReviewed 2014 ftmoes 2022-01-12T07:31:53Z We study the applicability of the Farquhar model for carbon isotopic discrimination (change in carbon iso-topic composition from air CO2 to tree-ring cellulose) in C3 plants to trees growing in the field. Two new carbon isotope datasets from Himalayan conifers with published data from another eight sites across the world show disparate trends in the plot of carbon iso-tope discrimination versus atmospheric carbon dioxide concentration, in contrast to the model prediction of absence of any trend. This is because the model assumes that the tree adjusts its stomatal conductance for water-use efficiency to maintain a constant ratio of carbon dioxide concentrations inside and outside the leaf and treats the diffusive and biochemical fraction-ation factors as constants. By introducing a simple lin-ear dependence of these fractionation factors with ambient temperature and humidity, we have enhanced the applicability of the model to naturally growing trees. Further, despite the disparate trends exhibited by the 10 trees, we show using the inverse modelling that it is possible to derive a unique record of past atmospheric CO2 concentrations using tree cellulose δ13C data. The reconstructions also replicate the summer pCO2 gradient from tropics to mid-latitudes. We also discuss the merits and demerits of the model, and compare the model-derived pCO2 with that of the ice core-based records from Law Dome. Article in Journal/Newspaper ice core Ministry of Earth Sciences, Government of India: Open Access Digital Repository Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) |
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Open Polar |
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Ministry of Earth Sciences, Government of India: Open Access Digital Repository |
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ftmoes |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Bose, T Chakraborty, S Borgaonkar, H Sengupta, S Ramesh, R Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
topic_facet |
Meteorology and Climatology |
description |
We study the applicability of the Farquhar model for carbon isotopic discrimination (change in carbon iso-topic composition from air CO2 to tree-ring cellulose) in C3 plants to trees growing in the field. Two new carbon isotope datasets from Himalayan conifers with published data from another eight sites across the world show disparate trends in the plot of carbon iso-tope discrimination versus atmospheric carbon dioxide concentration, in contrast to the model prediction of absence of any trend. This is because the model assumes that the tree adjusts its stomatal conductance for water-use efficiency to maintain a constant ratio of carbon dioxide concentrations inside and outside the leaf and treats the diffusive and biochemical fraction-ation factors as constants. By introducing a simple lin-ear dependence of these fractionation factors with ambient temperature and humidity, we have enhanced the applicability of the model to naturally growing trees. Further, despite the disparate trends exhibited by the 10 trees, we show using the inverse modelling that it is possible to derive a unique record of past atmospheric CO2 concentrations using tree cellulose δ13C data. The reconstructions also replicate the summer pCO2 gradient from tropics to mid-latitudes. We also discuss the merits and demerits of the model, and compare the model-derived pCO2 with that of the ice core-based records from Law Dome. |
format |
Article in Journal/Newspaper |
author |
Bose, T Chakraborty, S Borgaonkar, H Sengupta, S Ramesh, R |
author_facet |
Bose, T Chakraborty, S Borgaonkar, H Sengupta, S Ramesh, R |
author_sort |
Bose, T |
title |
Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
title_short |
Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
title_full |
Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
title_fullStr |
Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
title_full_unstemmed |
Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C |
title_sort |
estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13c |
publisher |
Indian Academy of Sciences |
publishDate |
2014 |
url |
http://moeseprints.incois.gov.in/941/ http://www.currentscience.ac.in/Volumes/107/06/0971.pdf |
long_lat |
ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Law Dome |
geographic_facet |
Law Dome |
genre |
ice core |
genre_facet |
ice core |
op_relation |
Bose, T and Chakraborty, S and Borgaonkar, H and Sengupta, S and Ramesh, R (2014) Estimation of past atmospheric carbon dioxide levels using tree-ring cellulose 13C. Current Science, 107 (6). pp. 971-982. |
_version_ |
1766029553621270528 |