Publication date: May 2018
Source:Atmospheric Environment, Volume 181
Author(s): Yucong Miao, Jianping Guo, Shuhua Liu, Chun Zhao, Xiaolan Li, Gen Zhang, Wei Wei, Yanjun Ma
The northeastern China frequently experiences severe aerosol pollution in winter under unfavorable meteorological conditions. How and to what extent the meteorological factors affect the air quality there are not yet clearly understood. Thus, this study investigated the impacts of synoptic patterns on the aerosol transport and planetary boundary layer (PBL) structure in Shenyang from 1 to 3 December 2016, using surface observations, sounding measurements, satellite data, and three-dimensional simulations. Results showed that the aerosol pollution occurred in Shenyang was not only related to the local emissions, but also contributed by trans-boundary transport of aerosols from the Beiijng-Tianjin-Hebei (BTH) region. In the presence of the westerly and southwesterly synoptic winds, the aerosols emitted from BTH could be brought to Shenyang. From December 2 to 3, the aerosols emitted from BTH accounted for ∼20% of near-surface PM2.5 in Shenyang. In addition, the large-scale synoptic forcings could affect the vertical mixing of pollutants through modulating the PBL structure in Shenyang. The westerly and southwesterly synoptic winds not only brought the aerosols but also the warmer air masses from the southwest regions to Shenyang. The strong warm advections above PBL could enhance the already existing thermal inversion layers capping over PBL in Shenyang, leading to the suppressions of PBL. Both the trans-boundary transport of aerosols and the suppressions of PBL caused by the large-scale synoptic forcings should be partly responsible for the poor air quality in Shenyang, in addition to the high pollutant emissions. The present study revealed the physical mechanisms underlying the aerosol pollution in Shenyang, which has important implications for better forecasting and controlling the aerosols pollution.
http://ift.tt/2p8ucvF
Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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! # Ola via Alexandros G.Sfakianakis on Inoreader
Η λίστα ιστολογίων μου
Σάββατο 10 Μαρτίου 2018
Impacts of synoptic condition and planetary boundary layer structure on the trans-boundary aerosol transport from Beijing-Tianjin-Hebei region to northeast China
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- Sorption of selected pharmaceuticals by a river se...
- Modes of selenium occurrence and LCD modeling of s...
- Distillers’ grains anaerobic digestion residue bio...
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- Quantification of polychlorinated biphenyl contami...
- The toxicity of cadmium ion (Cd 2+ ) to phycocyani...
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- Inflammatory arthritis in pediatric patients with ...
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- Optimisation of interface formation by shear incli...
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