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Late Miocene–Pliocene Asian monsoon intensification linked to Antarctic ice-sheet growth

Late Miocene–Pliocene Asian monsoon intensification linked to Antarctic ice-sheet growth
Late Miocene–Pliocene Asian monsoon intensification linked to Antarctic ice-sheet growth
Environmental conditions in one of Earth's most densely populated regions, East Asia, are dominated by the monsoon. While Quaternary monsoon variability is reasonably well understood, pre-Quaternary monsoon variability and dynamics remain enigmatic. In particular, little is known about potential relationships between northern hemispheric monsoon response and major Cenozoic changes in Antarctic ice cover. Here we document long-term East Asian summer monsoon (EASM) intensification through the Late Miocene–Pliocene (?8.2 to 2.6 Ma), and attribute this to progressive Antarctic glaciation. Our new high-resolution magnetic records of long-term EASM intensification come from the Late Miocene–Pliocene Red Clay sequence on the Chinese Loess Plateau; we identify underlying mechanisms using a numerical climate-model simulation of EASM response to an idealized stepwise increase in Antarctic ice volume. We infer that progressive Antarctic glaciation caused intensification of the cross-equatorial pressure gradient between an atmospheric high-pressure cell over Australia and a low-pressure cell over mid-latitude East Asia, as well as intensification of the cross-equatorial sea-surface temperature (SST) gradient. These combined atmospheric and oceanic adjustments led to EASM intensification. Our findings offer a new and more global perspective on the controls behind long-term Asian monsoon evolution.
environmental magnetism, East Asian monsoon, Chinese Loess Plateau, Red Clay, Late Miocene–Pliocene, Antarctic glaciation
0012-821X
75-87
Ao, Hong
13a3fe83-f313-47a9-baff-2e690979dae5
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Dekkers, Mark J.
9b5658b0-c0ac-41d4-b8de-c8a1b576489e
Liu, Xiaodong
8a273952-e4cf-4345-b45c-072ba5ba74c3
Rohling, Eelco J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Shi, Zhengguo
3f2afcb8-3835-497d-a160-8f85db304564
An, Zhisheng
e226c502-af02-437f-bb01-17154bc86b99
Zhao, Xiang
b2557f12-3eaf-434e-b3a5-8157385dc532
Ao, Hong
13a3fe83-f313-47a9-baff-2e690979dae5
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Dekkers, Mark J.
9b5658b0-c0ac-41d4-b8de-c8a1b576489e
Liu, Xiaodong
8a273952-e4cf-4345-b45c-072ba5ba74c3
Rohling, Eelco J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Shi, Zhengguo
3f2afcb8-3835-497d-a160-8f85db304564
An, Zhisheng
e226c502-af02-437f-bb01-17154bc86b99
Zhao, Xiang
b2557f12-3eaf-434e-b3a5-8157385dc532

Ao, Hong, Roberts, Andrew P., Dekkers, Mark J., Liu, Xiaodong, Rohling, Eelco J., Shi, Zhengguo, An, Zhisheng and Zhao, Xiang (2016) Late Miocene–Pliocene Asian monsoon intensification linked to Antarctic ice-sheet growth. Earth and Planetary Science Letters, 444, 75-87. (doi:10.1016/j.epsl.2016.03.028).

Record type: Article

Abstract

Environmental conditions in one of Earth's most densely populated regions, East Asia, are dominated by the monsoon. While Quaternary monsoon variability is reasonably well understood, pre-Quaternary monsoon variability and dynamics remain enigmatic. In particular, little is known about potential relationships between northern hemispheric monsoon response and major Cenozoic changes in Antarctic ice cover. Here we document long-term East Asian summer monsoon (EASM) intensification through the Late Miocene–Pliocene (?8.2 to 2.6 Ma), and attribute this to progressive Antarctic glaciation. Our new high-resolution magnetic records of long-term EASM intensification come from the Late Miocene–Pliocene Red Clay sequence on the Chinese Loess Plateau; we identify underlying mechanisms using a numerical climate-model simulation of EASM response to an idealized stepwise increase in Antarctic ice volume. We infer that progressive Antarctic glaciation caused intensification of the cross-equatorial pressure gradient between an atmospheric high-pressure cell over Australia and a low-pressure cell over mid-latitude East Asia, as well as intensification of the cross-equatorial sea-surface temperature (SST) gradient. These combined atmospheric and oceanic adjustments led to EASM intensification. Our findings offer a new and more global perspective on the controls behind long-term Asian monsoon evolution.

Text
Ao et al 2016_Shilou red clay-EPSL-final.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 12 March 2016
Published date: 15 June 2016
Keywords: environmental magnetism, East Asian monsoon, Chinese Loess Plateau, Red Clay, Late Miocene–Pliocene, Antarctic glaciation
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 394266
URI: https://eprints.soton.ac.uk/id/eprint/394266
ISSN: 0012-821X
PURE UUID: 1d559e6e-7261-4730-9d5c-2bdc3c4bf084
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 12 May 2016 12:19
Last modified: 15 Aug 2019 05:29

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