Preprints
https://doi.org/10.5194/acp-2022-204
https://doi.org/10.5194/acp-2022-204
 
22 Mar 2022
22 Mar 2022
Status: this preprint is currently under review for the journal ACP.

What caused the interdecadal shift of the ENSO impact on dust mass concentration over northwestern South Asia?

Lamei Shi1,2, Jiahua Zhang1,2, Fengmei Yao2, Da Zhang1,2, Jingwen Wang1,2, Xianglei Meng2, and Yuqin Liu3 Lamei Shi et al.
  • 1Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 101407, China
  • 3Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China

Abstract. The change of large-scale circulation, especially El Niño-Southern Oscillation (ENSO), play an important role in the interdecadal variability of dust activities over the dust source and downwind regions. However, the detailed factors that lead to the interdecadal variability of the ENSO impact on dust activities over the northwestern South Asia remain less clear, although previous studies have discussed the response of the interannual dust activities over the northwestern South Asia to the ENSO circle. Based on the linear regression model and MERRA-2 atmospheric aerosol reanalysis data, this study investigated the interdecadal variability of the ENSO impact on dust activities as well as the associated possible atmospheric drivers under two different warming phases over the northwestern South Asia. Results indicated that the relationship between ENSO and surface dust mass concentration (DUSMASS) experienced an obvious shift from the accelerated global warming period (1982–1996) to the warming hiatus period (2000–2014). The change of Atlantic SSTA pattern weakened the impact of ENSO on dust activities over the northwestern South Asia, while that of Indian Ocean SSTA pattern and PDO tended to strengthen ENSO’s effect. Both the Atlantic and Indian Ocean SSTA patterns were modulated by the duration of ENSO events (i.e., continuing and emerging ENSO). The Eurasian continent and Indian Ocean thermal contrast was less likely to cause the shift of ENSO–DUSMASS relationship. This study provides new sights to numerical simulation involving the influence of atmospheric teleconnections on the variability of dust activities and their influence mechanisms.

Lamei Shi et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-204', Anonymous Referee #1, 07 Apr 2022
  • RC2: 'Comment on acp-2022-204', Anonymous Referee #2, 29 Apr 2022

Lamei Shi et al.

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Short summary
Dust impacts climate and human life. Analyzing the interdecadal change of dust activity and its influence factors is crucial for disaster mitigation. Based on linear regression method, this study revealed the interdecadal variability of relationship between ENSO and dust over northwestern South Asia from 1982 to 2014 and analyzed the effects of atmospheric factors on this interdecadal variability. The result sheds new light on numerical simulation involving the interdecadal variation of dust.
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