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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-55
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Feb 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Direct radiative effects of dust aerosols emitted from the Tibetan Plateau on the East Asian summer monsoon – a regional climate model simulation
Hui Sun1, Xiaodong Liu1,2, and Zaitao Pan3 1SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
2CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China
3Department of Earth and Atmospheric Sciences, Saint Louis University, St.Louis, Missouri, MO 63108, USA
Abstract. While dust aerosols emitted from major Asian sources such as Taklimakan and Gobi Deserts have been shown to have strong effect on Asian monsoon and climate, the role of dust emitted from Tibetan Plateau (TP) itself, where aerosols can directly interact with the TP heat pump because of their physical proximity both in location and elevation, has not been examined. This study uses the dust coupled RegCM4.1 regional climate model to simulate the spatiotemporal distribution of dust aerosols originating in the TP and their radiative effects on the East Asian summer monsoon (EASM) during both heavy and light dust years. Two 20-year simulations with and without the dust emission from TP showed that direct radiative cooling in the mid-troposphere induced by the TP locally produced dust aerosols resulted in an overall anticyclonic circulation anomaly in the low-troposphere centered over the TP region. The northeasterly anomaly in the EASM region reduces its strength considerably. The simulations found a significant negative correlation between the TP column dust load produced by local emissions and the corresponding anomaly in the EASM index (R=−0.41). The locally generated TP dust can cause surface cooling far downstream in eastern Mongolia and northeastern China through stationery Rossby wave propagation. Although contribution to the total Asian dust source from within TP (mainly Qaidam Basin) is relatively small, its impacts on Asian monsoon and climate seems disproportionately large, likely owning to its higher elevation within TP itself.

Citation: Sun, H., Liu, X., and Pan, Z.: Direct radiative effects of dust aerosols emitted from the Tibetan Plateau on the East Asian summer monsoon – a regional climate model simulation, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-55, in review, 2017.
Hui Sun et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'Reviewer comments', Anonymous Referee #1, 23 Mar 2017 Printer-friendly Version 
AC1: 'Response to the first referee', Hui Sun, 26 May 2017 Printer-friendly Version Supplement 
 
RC2: 'Reviewer comments', Anonymous Referee #2, 28 Mar 2017 Printer-friendly Version 
AC2: 'Response to the second referee', Hui Sun, 26 May 2017 Printer-friendly Version Supplement 
Hui Sun et al.
Hui Sun et al.

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Short summary
Two 20-year simulations with and without the dust emission from the Tibetan Plateau (TP) showed that the dust emitted from the TP weakens the East Asian summer monsoon by the reduction in the TP heating and in thermal contrast in the middle troposphere between the land and sea. Although contribution to the total Asian dust source from within TP is relatively small, its impacts on Asian monsoon and climate seems disproportionately large, likely owning to its higher elevation within TP itself.
Two 20-year simulations with and without the dust emission from the Tibetan Plateau (TP) showed...
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