本文關(guān)鍵詞： PM. 后向軌跡 聚類分析 潛在源貢獻因子法 濃度權(quán)重軌跡 長三角區(qū)域　出處：《環(huán)境科學學報》2016年12期 　論文類型：期刊論文

【摘要】：2015年12月中國長三角區(qū)域經(jīng)歷了4次高濃度、大范圍、長時間的顆粒物污染.本研究基于HYSPLIT后向軌跡模式結(jié)合GDAS(Global Data Assimilation System,全球資料同化系統(tǒng))氣象數(shù)據(jù)和長三角區(qū)域15個主要城市的PM_(2.5)質(zhì)量濃度數(shù)據(jù),利用軌跡聚類、潛在源貢獻因子法(Potential Source Contribution Function,PSCF)和濃度權(quán)重軌跡法(Concentration-Weighted Trajectory,CWT)分析了2015年12月長三角區(qū)域主要氣流軌跡方向和重污染過程中細顆粒物的潛在來源分布,探討了不同污染過程的氣象特征和影響氣團分布.結(jié)果表明,2015年12月長三角區(qū)域主要受到來自西北和北方氣流影響(B、C、D類),其出現(xiàn)概率分別為39.5%、20.0%和25.8%;西方內(nèi)陸(A類)出現(xiàn)概率最低,僅為14.7%.西北內(nèi)陸方向長距離輸送(B類)對長三角區(qū)域空氣質(zhì)量影響較大,在此類氣團主導下,長三角區(qū)域顆粒物(PM_(2.5)、PM_(10))質(zhì)量濃度和氣態(tài)污染物(SO_2、NO_2、CO)質(zhì)量濃度平均值分別為90.9、135.1、32.4、54.4和1200μg·m~(-3),且粗顆粒物比重較其它3類聚類高;經(jīng)過東北海面氣團(C類)攜帶的顆粒物濃度也較高,且PM_(2.5)/PM_(10)比值最高,可能是其水汽含量較高加劇了污染物的二次生成.PSCF和CWT分析結(jié)果表明,污染過程1(12月5—8日)期間,長三角區(qū)域PM_(2.5)濃度主要受內(nèi)蒙東部、京津冀、山東和江蘇東部等地影響;污染過程2(12月10—11日)和污染過程3(12月13—15日)期間,京津冀地區(qū)對長三角區(qū)域PM_(2.5)濃度的貢獻都較低,污染過程2的主要潛在源區(qū)較為集中,主要為內(nèi)蒙東部、遼寧、山東東部、江蘇和上海;而污染過程3的潛在源區(qū)較廣,內(nèi)蒙西南地區(qū)、甘肅、山西、陜西、河南、河北南部、山東、安徽北部等地及長三角本地對區(qū)域PM_(2.5)濃度均有重要貢獻;污染過程4(12月20—27日)持續(xù)時間最長,相較前3次污染過程,京津冀地區(qū)和西南地區(qū)對長三角區(qū)域PM_(2.5)濃度的貢獻相對增加.總體來說,2015年12月4次污染過程期間長三角區(qū)域PM_(2.5)污染的潛在貢獻源主要集中在華北和華東(長三角)地區(qū),區(qū)域性污染和長距離輸送對冬季長三角區(qū)域空氣質(zhì)量有重要影響.
[Abstract]:In December 2015, the Yangtze River Delta region of China experienced four high concentrations and a wide range. Based on HYSPLIT backward trajectory model combined with GDAS(Global Data Assimilation system (GDAS(Global data assimilation system) meteorological data and mass concentration data of 15 major cities in Yangtze River Delta region, trajectory clustering was used in this study. Potential Source Contribution function (PSCFF) and Concentration-Weighted Trajector (CWTs) were used to analyze the direction of the main airflow trajectory and the distribution of potential sources of fine particulate matter in the heavy pollution process in the Yangtze River Delta region in December 2015. The meteorological characteristics of different pollution processes and the influence of air mass distribution are discussed. The results show that in December 2015, the Yangtze River Delta region was mainly affected by the northwestern and northern air currents, and its occurrence probability was 39.5% and 25.8% respectively. ) the lowest probability of occurrence, The air quality in the Yangtze River Delta region is greatly affected by the long distance transportation type B in the northwestern inland direction, which is dominated by this kind of air mass. In the Yangtze River Delta region, the average mass concentrations of particulate matter and gaseous pollutant so _ 2N _ 2C _ (C) were 90.9 ~ 135.1 ~ 32.4 渭 g 路m ~ (-1) and 1200 渭 g 路m ~ (-3), respectively, and the density of coarse particles was higher than that of the other three clusters, and the concentration of particulate matter passing through the northeast sea air mass was also higher than that of the other three clusters. Moreover, the highest ratio of PMSCF / PSCF / PSCF and CWT showed that the concentration of PMS2.5 in the Yangtze River Delta region was mainly attributed to the eastern part of Inner Mongolia and the Beijing-Tianjin-Hebei region during the pollution process 1 (December, 5-8). During the period of 2 (10-11 December) and 3 (13-15 December) of pollution process, the contribution of Beijing-Tianjin-Hebei region to PM2.5 concentration in Yangtze River Delta region was relatively low, and the main potential sources of pollution process 2 were concentrated. Mainly eastern Inner Mongolia, Liaoning, eastern Shandong, Jiangsu and Shanghai, while the potential source of pollution process 3 is relatively wide, southwest of Inner Mongolia, Gansu, Shanxi, Shaanxi, Henan, southern Hebei, Shandong, Shandong, Both northern Anhui and the Yangtze River Delta make important contributions to the concentration of PMSP 2.5. The pollution process of 4 (20-27 December) lasted the longest, compared with the previous three pollution processes. The contribution of Beijing-Tianjin-Hebei region and southwestern region to the concentration of PMMA-2.5) in the Yangtze River Delta region is relatively increased. In general, the potential sources of contribution to the pollution in the Yangtze River Delta region during the pollution process in December 4th 2015 are mainly concentrated in North China and East China (Yangtze River Delta). Regional pollution and long distance transport have important influence on air quality in Yangtze River Delta region in winter.
【作者單位】： 國家環(huán)境保護城市大氣復合污染成因與防治重點實驗室;上海市環(huán)境科學研究院;
【基金】：環(huán)境保護公益性行業(yè)科研專項(No.201409008) 上海市科委科技攻關(guān)項目(No.14DZ1202905)~~
【分類號】：X513

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