Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation

C. He; Z. Liu; B. L. Otto-Bliesner; E. C. Brady; C. Zhu; R. Tomas; P. U. Clark; J. Zhu; A. Jahn; S. Gu; J. Zhang; J. Nusbaumer; D. Noone; H. Cheng; Y. Wang; M. Yan; Y. Bao

doi:10.1126/sciadv.abe2611

Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation

C. He, Z. Liu, B. L. Otto-Bliesner, E. C. Brady, C. Zhu, R. Tomas, P. U. Clark, J. Zhu, A. Jahn, S. Gu, J. Zhang, J. Nusbaumer, D. Noone, H. Cheng, Y. Wang, M. Yan, Y. Bao

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133 Scopus citations

Abstract

Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China.

Original language	English
Article number	eabe2611
Journal	Science advances
Volume	7
Issue number	4
DOIs	https://doi.org/10.1126/sciadv.abe2611
State	Published - Jan 22 2021

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title = "Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation",

abstract = "Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China.",

author = "C. He and Z. Liu and Otto-Bliesner, \{B. L.\} and Brady, \{E. C.\} and C. Zhu and R. Tomas and Clark, \{P. U.\} and J. Zhu and A. Jahn and S. Gu and J. Zhang and J. Nusbaumer and D. Noone and H. Cheng and Y. Wang and M. Yan and Y. Bao",

note = "Publisher Copyright: Copyright {\textcopyright} 2021 The Authors, some rights reserved.",

year = "2021",

month = jan,

day = "22",

doi = "10.1126/sciadv.abe2611",

language = "English",

volume = "7",

journal = "Science advances",

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T1 - Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation

AU - He, C.

AU - Liu, Z.

AU - Otto-Bliesner, B. L.

AU - Brady, E. C.

AU - Zhu, C.

AU - Tomas, R.

AU - Clark, P. U.

AU - Zhu, J.

AU - Jahn, A.

AU - Gu, S.

AU - Zhang, J.

AU - Nusbaumer, J.

AU - Noone, D.

AU - Cheng, H.

AU - Wang, Y.

AU - Yan, M.

AU - Bao, Y.

PY - 2021/1/22

Y1 - 2021/1/22

N2 - Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China.

AB - Oxygen isotope speleothem records exhibit coherent variability over the pan-Asian summer monsoon (AM) region. The hydroclimatic representation of these oxygen isotope records for the AM, however, has remained poorly understood. Here, combining an isotope-enabled Earth system model in transient experiments with proxy records, we show that the widespread AM δ18Oc signal during the last deglaciation (20 to 11 thousand years ago) is accompanied by a continental-scale, coherent hydroclimate footprint, with spatially opposite signs in rainfall. This footprint is generated as a dynamically coherent response of the AM system primarily to meltwater forcing and secondarily to insolation forcing and is further reinforced by atmospheric teleconnection. Hence, widespread δ18Op depletion in the AM region is accompanied by a northward migration of the westerly jet and enhanced southwesterly monsoon wind, as well as increased rainfall from South Asia (India) to northern China but decreased rainfall in southeast China.

UR - https://www.scopus.com/pages/publications/85099920823

U2 - 10.1126/sciadv.abe2611

DO - 10.1126/sciadv.abe2611

M3 - Article

C2 - 33523950

AN - SCOPUS:85099920823

SN - 2375-2548

VL - 7

JO - Science advances

JF - Science advances

IS - 4

M1 - eabe2611

ER -

Hydroclimate footprint of pan-Asian monsoon water isotope during the last deglaciation

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