PMID- 37438274
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20230713
LR  - 20230718
IS  - 0250-3301 (Print)
IS  - 0250-3301 (Linking)
VI  - 44
IP  - 7
DP  - 2023 Jul 8
TI  - [Transmission and Growth Characteristics of Severe PM(2.5) Pollution Events from 
      2013 to 2021 in Xingtai, Hebei].
PG  - 3749-3759
LID - 10.13227/j.hjkx.202208049 [doi]
AB  - The correlation between the growth rate of PM(2.5) with transport source, 
      atmospheric circulation, and wind field were analyzed, focusing on the severe and 
      above pollution process (SAAP) in Xingtai, Hebei Province from 2013 to 2021. The 
      results showed that from 2013 to 2021, a total of 164 pollution processes and 103 
      SAAP occurred in Xingtai. In the ground circulation, although the probability 
      occurrence of the inverted trough was low, the probability of pollution was the 
      highest (61.1%), followed by the high-pressure control type (>50.0%). In the 500 
      hPa, the control of the straight westerly wind belt had the highest probability 
      of severe and above pollution (20.7%), followed by the post-trough type (16.1%), 
      with the highest occurrence frequency. In SAAP, the distribution of the PM(2.5) 
      hourly growth rate (DeltaPM(2.5)) was mainly concentrated between +/-150 
      mug.(m(3).h)(-1), and the PM(2.5) hourly growth rate was positive (+DeltaPM(2.5)), 
      contributing 61.7%. Among them, the average proportion of explosive growth was 
      13.9% (from 2013 to 2021), and the overall trend was decreasing annually. In the 
      full wind speed, in terms of occurrence frequency and pollution probability, 
      north-east (NE) was the wind direction most closely related to air pollution, 
      especially severe and above pollution. The mean value of DeltaPM(2.5) in SAAP was 
      lower than that of quiet wind in most wind directions. However, in some of the 
      east-north (EN) and south-west (SW) wind direction intervals, the mean DeltaPM(2.5) 
      in moderate wind speed was significantly higher than that of quiet wind (related 
      to pollution transmission). The impact of larger wind speed on DeltaPM(2.5) was more 
      complicated. The backward trajectories showed that the backward trajectories of 
      slow, rapid, and explosive growth in SAAP could be divided into three main 
      paths:west-north, east-north, and south. With the acceleration of the growth 
      rate, the proportion of the west-north air mass gradually increased. The humidity 
      (RH) of the slow-growth air mass was relatively large (more than 80% RH>50%), the 
      relative humidity of the rapidly growing air mass was relatively concentrated 
      (mainly distributed in 35%-55%), and the proportion of low-humidity (<50%) air 
      masses increased significantly (by approximately 63%) in the explosive growth. 
      The simulation analysis showed that the types of SAAP pollution could be divided 
      into five categories:local accumulation, east-northern transmission, north-west 
      transmission, mixed transmission, and south transmission. Among them, the 
      proportion of mixed transmission was the highest, followed by that of the 
      north-west transmission. The high and low-altitude configurations with the 
      highest occurrence probability among the southerly transmission, the local 
      accumulation type, and the north-easterly transport type were all high-altitude 
      trough rear type combined with ground equalization field type. Among the 
      north-westerly type, the high-pressure on the ground with the behind trough on 
      high-altitude had the highest probability of occurrence. In mixed transmission, 
      the probabilities of various circulation ratios were relatively balanced.
FAU - Jiang, Qi
AU  - Jiang Q
AD  - National Meteorological Centre, Beijing 100081, China.
FAU - Sheng, Li
AU  - Sheng L
AD  - China Meteorological Administration Earth System Modeling and Prediction Centre, 
      Beijing 100081, China.
FAU - Jin, Yu-Chen
AU  - Jin YC
AD  - Meteorological Science Institute of Inner Mongolia, Hohhot 010051, China.
FAU - Wang, Ji-Kang
AU  - Wang JK
AD  - National Meteorological Centre, Beijing 100081, China.
FAU - You, Yuan
AU  - You Y
AD  - National Meteorological Centre, Beijing 100081, China.
FAU - Wang, Fei
AU  - Wang F
AD  - Cloud-Precipitation Physics and Weather Modification Key Laboratory(CPML), China 
      Meteorological Administration, Beijing 100081, China.
LA  - chi
PT  - English Abstract
PT  - Journal Article
PL  - China
TA  - Huan Jing Ke Xue
JT  - Huan jing ke xue= Huanjing kexue
JID - 8405344
SB  - IM
OTO - NOTNLM
OT  - PM2.5
OT  - atmospheric circulation
OT  - explosive growth
OT  - pollution transmission
OT  - severe and above pollution process (SAAP)
EDAT- 2023/07/13 01:06
MHDA- 2023/07/13 01:07
CRDT- 2023/07/12 22:22
PHST- 2023/07/13 01:07 [medline]
PHST- 2023/07/13 01:06 [pubmed]
PHST- 2023/07/12 22:22 [entrez]
AID - 10.13227/j.hjkx.202208049 [doi]
PST - ppublish
SO  - Huan Jing Ke Xue. 2023 Jul 8;44(7):3749-3759. doi: 10.13227/j.hjkx.202208049.