Precession-band variance missing from East Asian monsoon runoff

Speleothem CaCO(3) δ(18)O is a commonly employed paleomonsoon proxy. However, inferring local rainfall amount from speleothem δ(18)O can be complicated due to changing source water δ(18)O, temperature effects, and rainout over the moisture transport path. These complications are addressed using δ(18...

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Autores principales: Clemens, S. C., Holbourn, A., Kubota, Y., Lee, K. E., Liu, Z., Chen, G., Nelson, A., Fox-Kemper, B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105601/
https://www.ncbi.nlm.nih.gov/pubmed/30135494
http://dx.doi.org/10.1038/s41467-018-05814-0
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author Clemens, S. C.
Holbourn, A.
Kubota, Y.
Lee, K. E.
Liu, Z.
Chen, G.
Nelson, A.
Fox-Kemper, B.
author_facet Clemens, S. C.
Holbourn, A.
Kubota, Y.
Lee, K. E.
Liu, Z.
Chen, G.
Nelson, A.
Fox-Kemper, B.
author_sort Clemens, S. C.
collection PubMed
description Speleothem CaCO(3) δ(18)O is a commonly employed paleomonsoon proxy. However, inferring local rainfall amount from speleothem δ(18)O can be complicated due to changing source water δ(18)O, temperature effects, and rainout over the moisture transport path. These complications are addressed using δ(18)O of planktonic foraminiferal CaCO(3), offshore from the Yangtze River Valley (YRV). The advantage is that the effects of global seawater δ(18)O and local temperature changes can be quantitatively removed, yielding a record of local seawater δ(18)O, a proxy that responds primarily to dilution by local precipitation and runoff. Whereas YRV speleothem δ(18)O is dominated by precession-band (23 ky) cyclicity, local seawater δ(18)O is dominated by eccentricity (100 ky) and obliquity (41 ky) cycles, with almost no precession-scale variance. These results, consistent with records outside the YRV, suggest that East Asian monsoon rainfall is more sensitive to greenhouse gas and high-latitude ice sheet forcing than to direct insolation forcing.
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spelling pubmed-61056012018-08-27 Precession-band variance missing from East Asian monsoon runoff Clemens, S. C. Holbourn, A. Kubota, Y. Lee, K. E. Liu, Z. Chen, G. Nelson, A. Fox-Kemper, B. Nat Commun Article Speleothem CaCO(3) δ(18)O is a commonly employed paleomonsoon proxy. However, inferring local rainfall amount from speleothem δ(18)O can be complicated due to changing source water δ(18)O, temperature effects, and rainout over the moisture transport path. These complications are addressed using δ(18)O of planktonic foraminiferal CaCO(3), offshore from the Yangtze River Valley (YRV). The advantage is that the effects of global seawater δ(18)O and local temperature changes can be quantitatively removed, yielding a record of local seawater δ(18)O, a proxy that responds primarily to dilution by local precipitation and runoff. Whereas YRV speleothem δ(18)O is dominated by precession-band (23 ky) cyclicity, local seawater δ(18)O is dominated by eccentricity (100 ky) and obliquity (41 ky) cycles, with almost no precession-scale variance. These results, consistent with records outside the YRV, suggest that East Asian monsoon rainfall is more sensitive to greenhouse gas and high-latitude ice sheet forcing than to direct insolation forcing. Nature Publishing Group UK 2018-08-22 /pmc/articles/PMC6105601/ /pubmed/30135494 http://dx.doi.org/10.1038/s41467-018-05814-0 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Clemens, S. C.
Holbourn, A.
Kubota, Y.
Lee, K. E.
Liu, Z.
Chen, G.
Nelson, A.
Fox-Kemper, B.
Precession-band variance missing from East Asian monsoon runoff
title Precession-band variance missing from East Asian monsoon runoff
title_full Precession-band variance missing from East Asian monsoon runoff
title_fullStr Precession-band variance missing from East Asian monsoon runoff
title_full_unstemmed Precession-band variance missing from East Asian monsoon runoff
title_short Precession-band variance missing from East Asian monsoon runoff
title_sort precession-band variance missing from east asian monsoon runoff
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105601/
https://www.ncbi.nlm.nih.gov/pubmed/30135494
http://dx.doi.org/10.1038/s41467-018-05814-0
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