Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis
A decrease in the C-13/C-12 ratio of atmospheric CO2 has been documented by direct observations since 1978 and from ice core measurements since the industrial revolution. This decrease, known as the C-13-Suess effect, is driven primarily by the input of fossil fuel-derived CO2 but is also sensitive...
Published in: | Proceedings of the National Academy of Sciences |
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Online Access: | https://hdl.handle.net/11370/06fbf884-f29f-46df-93f9-de35bac66a15 https://research.rug.nl/en/publications/06fbf884-f29f-46df-93f9-de35bac66a15 https://doi.org/10.1073/pnas.1619240114 https://pure.rug.nl/ws/files/49323930/PNAS_2017_Keeling_10361_6.pdf |
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ftunigroningenpu:oai:pure.rug.nl:publications/06fbf884-f29f-46df-93f9-de35bac66a15 2024-06-23T07:53:44+00:00 Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis Keeling, Ralph F. Graven, Heather D. Welp, Lisa R. Resplandy, Laure Bi, Jian Piper, Stephen C. Sun, Ying Bollenbacher, Alane Meijer, Harro A. J. 2017-09-26 application/pdf https://hdl.handle.net/11370/06fbf884-f29f-46df-93f9-de35bac66a15 https://research.rug.nl/en/publications/06fbf884-f29f-46df-93f9-de35bac66a15 https://doi.org/10.1073/pnas.1619240114 https://pure.rug.nl/ws/files/49323930/PNAS_2017_Keeling_10361_6.pdf eng eng https://research.rug.nl/en/publications/06fbf884-f29f-46df-93f9-de35bac66a15 info:eu-repo/semantics/openAccess Keeling , R F , Graven , H D , Welp , L R , Resplandy , L , Bi , J , Piper , S C , Sun , Y , Bollenbacher , A & Meijer , H A J 2017 , ' Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis ' , Proceedings of the National Academy of Science of the United States of America , vol. 114 , no. 39 , pp. 10361-10366 . https://doi.org/10.1073/pnas.1619240114 carbon cycle photosynthesis isotope water use efficiency carbon-13 Suess effect WATER-USE EFFICIENCY STOMATAL CONDUCTANCE CO2 DIOXIDE OCEAN DELTA-C-13 CLIMATE SENSITIVITY MILLENNIUM TRENDS article 2017 ftunigroningenpu https://doi.org/10.1073/pnas.1619240114 2024-05-27T16:23:03Z A decrease in the C-13/C-12 ratio of atmospheric CO2 has been documented by direct observations since 1978 and from ice core measurements since the industrial revolution. This decrease, known as the C-13-Suess effect, is driven primarily by the input of fossil fuel-derived CO2 but is also sensitive to land and ocean carbon cycling and uptake. Using updated records, we show that no plausible combination of sources and sinks of CO2 from fossil fuel, land, and oceans can explain the observed C-13-Suess effect unless an increase has occurred in the C-13/C-12 isotopic discrimination of land photosynthesis. A trend toward greater discrimination under higher CO2 levels is broadly consistent with tree ring studies over the past century, with field and chamber experiments, and with geological records of C-3 plants at times of altered atmospheric CO2, but increasing discrimination has not previously been included in studies of long-term atmospheric 13C/12C measurements. We further show that the inferred discrimination increase of 0.014 +/- 0.007% ppm(-1) is largely explained by photorespiratory and mesophyll effects. This result implies that, at the global scale, land plants have regulated their stomatal conductance so as to allow the CO2 partial pressure within stomatal cavities and their intrinsic water use efficiency to increase in nearly constant proportion to the rise in atmospheric CO2 concentration. Article in Journal/Newspaper ice core University of Groningen research database Proceedings of the National Academy of Sciences 114 39 10361 10366 |
institution |
Open Polar |
collection |
University of Groningen research database |
op_collection_id |
ftunigroningenpu |
language |
English |
topic |
carbon cycle photosynthesis isotope water use efficiency carbon-13 Suess effect WATER-USE EFFICIENCY STOMATAL CONDUCTANCE CO2 DIOXIDE OCEAN DELTA-C-13 CLIMATE SENSITIVITY MILLENNIUM TRENDS |
spellingShingle |
carbon cycle photosynthesis isotope water use efficiency carbon-13 Suess effect WATER-USE EFFICIENCY STOMATAL CONDUCTANCE CO2 DIOXIDE OCEAN DELTA-C-13 CLIMATE SENSITIVITY MILLENNIUM TRENDS Keeling, Ralph F. Graven, Heather D. Welp, Lisa R. Resplandy, Laure Bi, Jian Piper, Stephen C. Sun, Ying Bollenbacher, Alane Meijer, Harro A. J. Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
topic_facet |
carbon cycle photosynthesis isotope water use efficiency carbon-13 Suess effect WATER-USE EFFICIENCY STOMATAL CONDUCTANCE CO2 DIOXIDE OCEAN DELTA-C-13 CLIMATE SENSITIVITY MILLENNIUM TRENDS |
description |
A decrease in the C-13/C-12 ratio of atmospheric CO2 has been documented by direct observations since 1978 and from ice core measurements since the industrial revolution. This decrease, known as the C-13-Suess effect, is driven primarily by the input of fossil fuel-derived CO2 but is also sensitive to land and ocean carbon cycling and uptake. Using updated records, we show that no plausible combination of sources and sinks of CO2 from fossil fuel, land, and oceans can explain the observed C-13-Suess effect unless an increase has occurred in the C-13/C-12 isotopic discrimination of land photosynthesis. A trend toward greater discrimination under higher CO2 levels is broadly consistent with tree ring studies over the past century, with field and chamber experiments, and with geological records of C-3 plants at times of altered atmospheric CO2, but increasing discrimination has not previously been included in studies of long-term atmospheric 13C/12C measurements. We further show that the inferred discrimination increase of 0.014 +/- 0.007% ppm(-1) is largely explained by photorespiratory and mesophyll effects. This result implies that, at the global scale, land plants have regulated their stomatal conductance so as to allow the CO2 partial pressure within stomatal cavities and their intrinsic water use efficiency to increase in nearly constant proportion to the rise in atmospheric CO2 concentration. |
format |
Article in Journal/Newspaper |
author |
Keeling, Ralph F. Graven, Heather D. Welp, Lisa R. Resplandy, Laure Bi, Jian Piper, Stephen C. Sun, Ying Bollenbacher, Alane Meijer, Harro A. J. |
author_facet |
Keeling, Ralph F. Graven, Heather D. Welp, Lisa R. Resplandy, Laure Bi, Jian Piper, Stephen C. Sun, Ying Bollenbacher, Alane Meijer, Harro A. J. |
author_sort |
Keeling, Ralph F. |
title |
Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
title_short |
Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
title_full |
Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
title_fullStr |
Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
title_full_unstemmed |
Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
title_sort |
atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis |
publishDate |
2017 |
url |
https://hdl.handle.net/11370/06fbf884-f29f-46df-93f9-de35bac66a15 https://research.rug.nl/en/publications/06fbf884-f29f-46df-93f9-de35bac66a15 https://doi.org/10.1073/pnas.1619240114 https://pure.rug.nl/ws/files/49323930/PNAS_2017_Keeling_10361_6.pdf |
genre |
ice core |
genre_facet |
ice core |
op_source |
Keeling , R F , Graven , H D , Welp , L R , Resplandy , L , Bi , J , Piper , S C , Sun , Y , Bollenbacher , A & Meijer , H A J 2017 , ' Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis ' , Proceedings of the National Academy of Science of the United States of America , vol. 114 , no. 39 , pp. 10361-10366 . https://doi.org/10.1073/pnas.1619240114 |
op_relation |
https://research.rug.nl/en/publications/06fbf884-f29f-46df-93f9-de35bac66a15 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1073/pnas.1619240114 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
114 |
container_issue |
39 |
container_start_page |
10361 |
op_container_end_page |
10366 |
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1802645515994660864 |