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Discussion papers
https://doi.org/10.5194/acp-2018-910
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-910
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Nov 2018

Research article | 06 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Two pathways of how SST anomalies drive the interannual variability of autumnal haze days in the Beijing–Tianjin–Hebei region, China

Jing Wang1, Zhiwei Zhu1, Li Qi1, Qiaohua Zhao1, Jinhai He1, and Julian X. L. Wang2 Jing Wang et al.
  • 1Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China
  • 2Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD, USA

Abstract. Analogous to the circumstances in wintertime, the increasing severity of autumnal haze pollution over the Beijing–Tianjin–Hebei (BTH) region may also lead to impairment of the socioeconomic development and human health in this region. Despite manmade aerosol emissions, the interannual variability of autumnal (September–October–November) haze days (AHD) in the BTH region (AHDBTH) is apparently tied to the global and regional meteorological anomalies. The present study suggests that an above-normal AHDBTH is closely associated with the simultaneous sea surface temperature (SST) warming in two regions [over the North Atlantic subtropical sector (R1) and over the western North Pacific sector (R2)]. When the autumnal SST warming in R1 and R2 are both remarkably significant, the joint impacts can greatly enhance the likelihood of a higher AHDBTH. Observational and simulation evidence suggests that SST anomalies can affect the variation in AHDBTH via two different pathways. Firstly, SST warming in R1 can induce a downstream mid-latitudinal Rossby wave train, leading to a barotropic high-pressure and subsidence anomaly over the BTH region. Secondly, SST warming in R2 can also result in air subsidence over the BTH region through an anomalous local meridional cell. Through these two distinct pathways, localized meteorological circumstances conducive to a higher AHDBTH (i.e., repressed planetary boundary layer, weak southerly airflow, and warm and moist conditions) can be established.

Jing Wang et al.
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Data sets

Atmospheric circulation data ECMWF https://doi.org/10.1002/qj.828

Atmospheric circulation data NCEP/NCAR https://doi.org/10.1175/1520-0477(1996)077<0437:tnyrp>2.0.co;2

Sea-surface-temperature data NOAA https://doi.org/10.1175/jcli-d-16-0836.1

Monthly precipitation data NOAA https://doi.org/10.1175/1525-7541(2002)003<0249:glpaym>2.0.co;2

Ground observations CMA https://doi.org/10.5194/acp-18-3173-2018

Jing Wang et al.
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Short summary
Fewer attentions have been paid to haze weather during autumn season. Here, we unravel the mechanism on how SST anomalies over the subtropical North Atlantic and western North Pacific drive the interannual variability of the autumnal haze days in Beijing–Tianjin–Hebei region. The two pathways of SST anomaly forcings can result in anticyclonic (cyclonic) anomaly over Northeast Asia, leading to lower-level anomalous southerly (northerly) and in turn more (less) haze days in this region.
Fewer attentions have been paid to haze weather during autumn season. Here, we unravel the...
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