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Anthropogenic sulfate aerosol pollution in South and East Asia induces increased summer precipitation over arid Central Asia

Journal Article · · Communications Earth & Environment
 [1];  [2];  [3];  [4];  [5];  [6];  [1];  [1];  [1];  [7];  [8];  [9]
  1. Chinese Academy of Sciences (CAS) (China)
  2. Center for International Climate and Environmental Research, Oslo (Norway)
  3. Duke Univ., Durham, NC (United States)
  4. Columbia Univ., New York, NY (United States); NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
  5. Kyushu Univ., Fukuoka (Japan)
  6. Imperial College, London (United Kingdom); Technical University of Crete (Greece)
  7. Chinese Academy of Sciences (CAS) (China); Xi’an Institute for Innovative Earth Environment Research (China)
  8. Chinese Academy of Sciences (CAS) (China); University of Chinese Academy of Sciences, Beijing (China)
  9. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Department
Precipitation has increased across the arid Central Asia region over recent decades. However, the underlying mechanisms of this trend are poorly understood. Here, we analyze multi-model simulations from the Precipitation Driver and Response Model Intercomparison Project (PDRMIP) to investigate potential drivers of the observed precipitation trend. We find that anthropogenic sulfate aerosols over remote polluted regions in South and East Asia lead to increased summer precipitation, especially convective and extreme precipitation, in arid Central Asia. Elevated concentrations of sulfate aerosols over remote polluted Asia cause an equatorward shift of the Asian Westerly Jet Stream through a fast response to cooling of the local atmosphere at mid-latitudes. This shift favours moisture supply from low-latitudes and moisture flux convergence over arid Central Asia, which is confirmed by a moisture budget analysis. High levels of absorbing black carbon lead to opposing changes in the Asian Westerly Jet Stream and reduced local precipitation, which can mask the impact of sulfate aerosols. This teleconnection between arid Central Asia precipitation and anthropogenic aerosols in remote Asian polluted regions highlights long-range impacts of anthropogenic aerosols on atmospheric circulations and the hydrological cycle.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center
Sponsoring Organization:
Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
Argonne National Laboratory (ANL); Brookhaven National Laboratory (BNL); Pacific Northwest National Laboratory (PNNL)
Grant/Contract Number:
SC0012704
OSTI ID:
1908165
Alternate ID(s):
OSTI ID: 1913810
Report Number(s):
BNL-223859-2023-JAAM
Journal Information:
Communications Earth & Environment, Journal Name: Communications Earth & Environment Journal Issue: 1 Vol. 3; ISSN 2662-4435
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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