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Clarifying the relationship between PM2.5 and ozone complex pollution and synoptic patterns in a typical petrochemical city in the Bohai Rim region of China:Implications for air pollution forecasting and control 认领 引用
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作者 Yongxin Yan Cong An +7 位作者 Junling Li Yuanyuan Ji Rui Gao Hong Wang Fanyi Shang Linlin Ma Xiaoshuai Gao Hong Li 《Atmospheric and Oceanic Science Letters》 CSCD 2024年第6期45-52,共8页
Meteorological conditions are vital to PM2.5and ozone(O3)complex pollution.Herein,the T-mode principal com-ponent analysis method was employed to objectively classify the 925-hPa geopotential height field of Don... Meteorological conditions are vital to PM2.5and ozone(O3)complex pollution.Herein,the T-mode principal com-ponent analysis method was employed to objectively classify the 925-hPa geopotential height field of Dongying from 2017 to 2022.Synoptic patterns associated with four pollution types-namely,PM2.5-only pollution,O3-only pollution,Co-occurring of PM2.5and O3pollution,Non-occurring of PM2.5and O3pollution-were characterized at different time scales.The results indicated that synoptic classes conducive to PM2.5-only pollution were“high-pressure top front”,“offshore high-pressure rear”,and“high-pressure inside”,while those conducive to O3-only pollution were“offshore high-pressure rear”,“subtropical high”,and“high and low systems”.The Co-occurring of PM2.5and O3pollution were influenced by high pressure,and the Non-occurring of PM2.5and O3pollution were linked to precipitation and strong northerly winds.The variation in dominant synoptic patterns is crucial in the frequency changes of the four pollution types,which was further validated through the analysis of typical cases.Under the favorable meteorological conditions of high-pressure control with strong northerly winds or a subtropical high and inverted trough both with strong precipitation,there is potential to achieve coordinated control of PM2.5and O3in Dongying.Additionally,measures like artificially manipulating local humidity could be adopted to alleviate pollution levels.This study reveals the importance of comprehending the meteorological factors contributing to the formation of PM2.5and O3complex pollution for the improvement of urban air quality in the Bohai Rim region of China when emissions are high and the concentration of air pollutants exhibits high meteorological sensitivity. 展开更多
关键词 Synoptic classification T-mode principal component analysis Complex air pollution Correlation analysis Bohai Rim region
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Influence of circulation types on temporal and spatial variations of ozone in Beijing 认领 引用 被引量：4
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作者 Xiaowan Zhu JinWu +8 位作者 Guiqian Tang Lin Qiao Tingting Han Xiaomei Yin Xiangxue Liu Ziming Li Yajun Xiong Di He Zhiqiang Ma 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第8期37-51,共15页
This study analyzes the impact of circulation types(CTs)on ozone(O3)pollution in Beijing.The easterly high-pressure(SWW)circulation occurred most frequently(30%;276 day),followed by northwesterly high-pressure(AN)c... This study analyzes the impact of circulation types(CTs)on ozone(O3)pollution in Beijing.The easterly high-pressure(SWW)circulation occurred most frequently(30%;276 day),followed by northwesterly high-pressure(AN)circulation(24.3%;224 day).The SWW type had the highest O3 anomaly of+17.28μg/m3,which was caused by excellent photochemical reactions,poor diffusion ability and regional transport.Due to the higher humidity and precipitation in the low-pressure type(C),the O3 increase(+8.02μg/m3)was less than that in the SWW type.Good diffusion/wet deposition and weak formation ability contributed to O3 decrease in AN(-12.54μg/m3)and northerly high-pressure(ESN)CTs(-12.26μg/m3).The intra-area transport of O3 was significant in polluted circulations(SWW-and C-CTs).In addition,higher temperature,radiation and less rainfall also contributed to higher O3 in northern Beijing under the SWW type.For the clean CTs(AN and ESN CTs),precursor amount and intra-area transport played a dominant role in O3 distribution.Under the northeasterly low-pressure CT,better formation conditions and higher precursor amount combined with the intra-area southerly transport to cause higher O3 values in the south than in the north.The higher O3 in the northwestern area under the northeasterly high-pressure type was influenced by weaker titration loss and high O3 concentration in previous day.Annual variation in the CTs contributed up to 86.1%of the annual variation in O3.About 78%-83%of the diurnal variation in O3 resulted from local meteorological factors. 展开更多
关键词 Ozone Objective synoptic classification Temporal variation and spatial distribution Intra-area transport
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The Utility of 1000 - 500 mb Thickness and Weather Type as a Rain-Snow Divide: A 30-Year Study at Albany, NY 认领 引用 被引量：1
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作者 Allison C. Hannigan Melissa L. Godek 《Atmospheric and Climate Sciences》 2020年第3期372-391,共20页
Winter synoptic conditions that produce snowfall with bitterly cold temperatures create both social and economic hazards in the capital city of Albany, NY. Sometimes these systems are forecasted in error to produce ra... Winter synoptic conditions that produce snowfall with bitterly cold temperatures create both social and economic hazards in the capital city of Albany, NY. Sometimes these systems are forecasted in error to produce rain or mixed precipitation. It is beneficial for meteorologists to better understand the commonly used 5400 and 1300 GPM line to better forecast rain versus snow events. Other studies have looked into the use of the 5400 GPM (540 dm) line but none have assessed the validity of this boundary with respect to weather type characterization at Albany. This study aims to determine the reliability of the widely referenced guides for depicting the rain-snow line, and improve forecast aids for the vertical atmosphere during winter precipitation events. The mean daily 500, 850, 925 and 1000 mb heights and weather type frequency of the Spatial Synoptic Classification between November and March of 1980 - 2012 are analyzed. Results indicate that the standard vertical boundaries are inaccurate indicators of a rain versus snow event in Albany. More reasonable rain-snow cut offs for the 1000 - 500 and 1000 - 850 mb thicknesses are 5222 and 1262 GPM. For the 1000 - 925 mb level, 606 GPM is a helpful aid of identifying the rain-snow boundary. Further scrutinizing by weather type indicates that the rain-snow boundary also varies depending on what air mass/weather type is present on a given day. For instance, when the most prominent weather type is observed over Albany (Dry Polar), at the 1000 - 850 mb and 1000 - 500 mb layers, a boundary of 1242 GPM and 5152 GPM is found to be most representative. Results indicate only for the rarest of winter weather types observed over Albany, Moist Tropical, are the standard cut offs useful. Determining the reliability of this precipitation indicator at a specific station, like Albany, could enable meteorologists in other regions of the country to draw parallels between weather type, precipitation, and thickness in their forecast zones. 展开更多
关键词 Thickness Geopotential Weather Type Air Mass Northeast US Spatial Synoptic Classification Snow Rain
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