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Title: Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

Abstract

Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March–April–May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian (EA) dust source region and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1 % over EA and 36.9 % over NP. These corresponding differences aremore » found in MERRA-2 with 22.9 % and 13.3 % over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust deposition) are also significantly enhanced during the strongest TPSH years over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over the TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transport over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates requires considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [3];  [4];  [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Chinese Academy of Sciences (CAS), Xi’an (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Chinese Academy of Sciences (CAS), Xi’an (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Nanjing Univ. of Science Information &Technology, Nanjing (China)
  5. Chinese Academy of Meteorological Sciences (CMA) Beijing (China)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1661633
Report Number(s):
BNL-216363-2020-JAAM
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 20; Journal Issue: 18; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Xie, Xiaoning, Duan, Anmin, Shi, Zhengguo, Li, Xinzhou, Sun, Hui, Liu, Xiaodong, Cheng, Xugeng, Zhao, Tianliang, Che, Huizheng, and Liu, Yangang. Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle. United States: N. p., 2020. Web. https://doi.org/10.5194/acp-20-11143-2020.
Xie, Xiaoning, Duan, Anmin, Shi, Zhengguo, Li, Xinzhou, Sun, Hui, Liu, Xiaodong, Cheng, Xugeng, Zhao, Tianliang, Che, Huizheng, & Liu, Yangang. Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle. United States. https://doi.org/10.5194/acp-20-11143-2020
Xie, Xiaoning, Duan, Anmin, Shi, Zhengguo, Li, Xinzhou, Sun, Hui, Liu, Xiaodong, Cheng, Xugeng, Zhao, Tianliang, Che, Huizheng, and Liu, Yangang. Tue . "Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle". United States. https://doi.org/10.5194/acp-20-11143-2020. https://www.osti.gov/servlets/purl/1661633.
@article{osti_1661633,
title = {Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle},
author = {Xie, Xiaoning and Duan, Anmin and Shi, Zhengguo and Li, Xinzhou and Sun, Hui and Liu, Xiaodong and Cheng, Xugeng and Zhao, Tianliang and Che, Huizheng and Liu, Yangang},
abstractNote = {Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March–April–May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian (EA) dust source region and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1 % over EA and 36.9 % over NP. These corresponding differences are found in MERRA-2 with 22.9 % and 13.3 % over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust deposition) are also significantly enhanced during the strongest TPSH years over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over the TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transport over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates requires considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming.},
doi = {10.5194/acp-20-11143-2020},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 18,
volume = 20,
place = {United States},
year = {2020},
month = {9}
}

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