Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene
The moisture history in arid central Asia (ACA) differs from that in the Asian monsoon region during the Holocene. Much less is known about causes of Holocene moisture changes in ACA than Asian monsoon precipitation changes, hampering our understanding of their spatiotemporal differences. In this st...
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crsagepubl:10.1177/0959683615612569 2024-10-13T14:10:44+00:00 Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene Zhang, Xiaojian Jin, Liya Huang, Wei Chen, Fahu 2015 http://dx.doi.org/10.1177/0959683615612569 https://journals.sagepub.com/doi/pdf/10.1177/0959683615612569 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615612569 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 26, issue 4, page 549-555 ISSN 0959-6836 1477-0911 journal-article 2015 crsagepubl https://doi.org/10.1177/0959683615612569 2024-09-24T04:12:22Z The moisture history in arid central Asia (ACA) differs from that in the Asian monsoon region during the Holocene. Much less is known about causes of Holocene moisture changes in ACA than Asian monsoon precipitation changes, hampering our understanding of their spatiotemporal differences. In this study, orbital-scale evolution of winter rainfall in northwestern China (a part of the core zone in ACA) during the Holocene and possible driving mechanisms are investigated using results from a long-term transient simulation performed by an atmosphere–ocean–sea-ice coupled general circulation model, the Kiel Climate Model, forced by orbital variations. Our results reveal a persistent wetting trend in northwestern China in winter throughout the Holocene, which is in response to winter insolation at mid-northern latitudes. Winter insolation can influence the rainfall via three ways. First, increasing latitudinal gradient of the incoming solar insolation at mid-latitudes strengthens the westerly intensity. Second, the evaporation is enhanced because of insolation-induced winter temperature rising, resulting in an increase in the air humidity. Intensified westerly winds and the increased water vapour together are conductive to enhance moisture transport towards northwestern China and thus increase winter precipitation in this area. Third, the increasing trend of winter insolation weakens the East Asian winter monsoon, which is favourable for the formation of rainfall via crippling the Siberian High that is beneficial for atmospheric lifting motion. Article in Journal/Newspaper Sea ice SAGE Publications The Holocene 26 4 549 555 |
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SAGE Publications |
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English |
description |
The moisture history in arid central Asia (ACA) differs from that in the Asian monsoon region during the Holocene. Much less is known about causes of Holocene moisture changes in ACA than Asian monsoon precipitation changes, hampering our understanding of their spatiotemporal differences. In this study, orbital-scale evolution of winter rainfall in northwestern China (a part of the core zone in ACA) during the Holocene and possible driving mechanisms are investigated using results from a long-term transient simulation performed by an atmosphere–ocean–sea-ice coupled general circulation model, the Kiel Climate Model, forced by orbital variations. Our results reveal a persistent wetting trend in northwestern China in winter throughout the Holocene, which is in response to winter insolation at mid-northern latitudes. Winter insolation can influence the rainfall via three ways. First, increasing latitudinal gradient of the incoming solar insolation at mid-latitudes strengthens the westerly intensity. Second, the evaporation is enhanced because of insolation-induced winter temperature rising, resulting in an increase in the air humidity. Intensified westerly winds and the increased water vapour together are conductive to enhance moisture transport towards northwestern China and thus increase winter precipitation in this area. Third, the increasing trend of winter insolation weakens the East Asian winter monsoon, which is favourable for the formation of rainfall via crippling the Siberian High that is beneficial for atmospheric lifting motion. |
format |
Article in Journal/Newspaper |
author |
Zhang, Xiaojian Jin, Liya Huang, Wei Chen, Fahu |
spellingShingle |
Zhang, Xiaojian Jin, Liya Huang, Wei Chen, Fahu Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
author_facet |
Zhang, Xiaojian Jin, Liya Huang, Wei Chen, Fahu |
author_sort |
Zhang, Xiaojian |
title |
Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
title_short |
Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
title_full |
Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
title_fullStr |
Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
title_full_unstemmed |
Forcing mechanisms of orbital-scale changes in winter rainfall over northwestern China during the Holocene |
title_sort |
forcing mechanisms of orbital-scale changes in winter rainfall over northwestern china during the holocene |
publisher |
SAGE Publications |
publishDate |
2015 |
url |
http://dx.doi.org/10.1177/0959683615612569 https://journals.sagepub.com/doi/pdf/10.1177/0959683615612569 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615612569 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
The Holocene volume 26, issue 4, page 549-555 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683615612569 |
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The Holocene |
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26 |
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4 |
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549 |
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555 |
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1812818204450357248 |