Preprints
https://doi.org/10.5194/acp-2021-249
https://doi.org/10.5194/acp-2021-249

  15 Jul 2021

15 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

Distinct evolutions of haze pollution from winter to following spring over the North China Plain: Role of the North Atlantic sea surface temperature anomalies

Linye Song1, Shangfeng Chen2, Wen Chen2, Jianping Guo3, Conglan Cheng1, and Yong Wang4 Linye Song et al.
  • 1Institute of Urban Meteorology, China Meteorological Administration, Beijing, China
  • 2Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China
  • 4ZAMG, Central Institute for Meteorology and Geodynamics, Vienna, Austria

Abstract. This study reveals that haze pollution (HP) over the North China Plain (NCP) in winter can persist to following spring during most years. The persistence of HPNCP is attributed to maintenance of an anticyclonic anomaly (AA) over northeast Asia and southerly wind anomalies over the NCP. Southerly wind anomalies over the NCP reduce surface wind speed and increase relative humidity, which are conducive to above-normal HPNCP both in winter and spring. However, there exist several years when above-normal HPNCP in winter are followed by below-normal HPNCP in the following spring. The reversed HPNCP in winter and spring in these years is due to the inverted atmospheric anomalies over northeast Asia. In particular, AA over northeast Asia in winter is replaced by a cyclonic anomaly (CA) in the following spring. The resultant spring northerly wind anomalies over NCP are conducive to below-normal HPNCP. These two distinctive evolutions of HPNCP and atmospheric anomalies over northeast Asia from winter to spring are attributed to the different evolutions of sea surface temperature anomalies (SSTA) in the North Atlantic. In the persistent years, warm North Atlantic SSTA in winter maintains to following spring via positive air-sea interaction process and induces a negative spring North Atlantic Oscillation (NAO)-like pattern, which contributes to the AA over northeast Asia via atmospheric wave train. By contrast, in the reverse years, cold SSTA in the North Atlantic is maintained from winter to spring, which induces a positive spring NAO-like pattern and leads to CA over northeast Asia via atmospheric wave train. The findings suggest that North Atlantic SSTA plays crucial roles in modulating the distinct evolutions of HPNCP from winter to succedent spring, which can be served as an important preceding signal for haze pollution evolution over the North China Plain.

Linye Song et al.

Status: open (until 26 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Linye Song et al.

Linye Song et al.

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Short summary
This study reveals that in most years when haze pollution (HP) over the North China Plain (NCP) is more (less) serious in winter, air condition in the following spring is also worse (better) than normal. Additionally,there appear some years when HP in the following spring are opposite to those in winter. It is found that North Atlantic SST anomalies play important roles in the evolution of HP over the NCP. Thus, North Atlantic SST is an important preceding signal for HP evolution over the NCP.
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