A possible linkage between dust frequency and the siberian high in march over northeast asia

Sung Bin Park, Jeong A. Cho, Sang Seo Park, Ja Ho Koo, Yun Gon Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Spring dust frequency in northeast Asia has been investigated using various approaches to understand the mechanisms of dust emission and transport. However, little attention has been paid to the linkage between dust activity and the Siberian High (SH), particularly when the SH pressure system is highly variable. In this study, we characterize the possible physical mechanisms of dust emission and transport associated with the Siberian High Intensity (SHI) and Siberian High Position Index (SHPI) in March using 18 years of ground-based observations and reanalysis data. We found that when the SHI was strong and the SH’s center was farther east (“Strong–East period”), surface and atmospheric temperatures were cooler than when the SHI was weak and the SH’s center was farther west (“Weak-West period”), due to anomalous anticyclonic pressure and strong easterlies. As a result, a reduction in the meridional temperature gradient in the lower atmosphere suppressed dust emission and transport, due to stagnant atmospheric conditions. This anomalous anticyclonic pressure in the Strong-East case seems to reduce the development of extratropical cyclones (ETC) in northeast Asia, leading to a less effective dust transport. A case study with composite analysis also showed a similar physical mechanism: stagnant air accompanying weakened westerlies in the Strong-East period suppressed dust transport to South Korea. Our findings reveal that the intensity and position of the SH can be utilized to identify spring transboundary air pollutants in northeast Asia.

Original languageEnglish
Article number176
Pages (from-to)1-21
Number of pages21
JournalAtmosphere
Volume12
Issue number2
DOIs
Publication statusPublished - 2021 Feb

Bibliographical note

Funding Information:
Funding: This research was funded by the grant (NRF-2018R1C1B6008223) from the National Research Foundation of Korea (NRF).

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Environmental Science (miscellaneous)

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