本文選題：熱力和動力結(jié)構(gòu)　切入點：污染物輸送和擴散　出處：《中國環(huán)境科學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：利用北京、天津、河北地區(qū)常規(guī)氣象數(shù)據(jù)、PM_(2.5)濃度、激光雷達數(shù)據(jù),鐵塔數(shù)據(jù),結(jié)合風(fēng)廓線數(shù)據(jù)對2015年10月13~17日發(fā)生在北京的空氣重污染過程中大氣熱力和動力結(jié)構(gòu)進行分析.結(jié)果表明,白天熱力條件轉(zhuǎn)好后,邊界層低層垂直方向氣流由上-下運動轉(zhuǎn)變?yōu)閮A斜運動,同時水平方向偏南風(fēng)增大,高濃度氣團向北京移動,污染物輸送增強,造成這種空間結(jié)構(gòu)的原因主要是熱力條件加強后等溫面由準東-西向轉(zhuǎn)變?yōu)槲鞅?東南向,由于山地加熱激發(fā)的重力波振幅在白天增強,高空水平方向輸送至北京的污染物在垂直方向出現(xiàn)向上和向下的傳輸.16日白天地面PM_(2.5)濃度的快速升高,這是在PM_(2.5)存在一定垂直交換的情況下,近地面偏南風(fēng)輸送的作用所致,以上出現(xiàn)的大氣污染物輸送和擴散機制可以在一定程度上解釋區(qū)域重污染背景下,白天混合層高度升高而近地層PM_(2.5)濃度卻隨之升高的現(xiàn)象.
[Abstract]:Using the conventional meteorological data of Beijing, Tianjin and Hebei, the density of PMSP 2.5), the data of lidar, the data of iron tower, Combined with wind profile data, the thermal and dynamic structure of the atmosphere during the heavy air pollution from October 2015 to 17th in Beijing is analyzed. The results show that the thermal conditions are improved during the daytime. The vertical flow in the lower layer of the boundary layer changed from upper-bottom motion to tilting motion, while the horizontal direction of the southward wind increased, the high concentration of air mass moved to Beijing, and the transport of pollutants increased. The main reason for this spatial structure is that the isothermal surface changed from Zhundong to west-west to northwest to southeast after the thermal conditions were strengthened, and the amplitude of gravity wave excited by mountain heating increased during the day. The vertical and downward transport of pollutants from high altitude horizontal direction to Beijing. In 16th, the rapid increase of surface PMmatter 2.5) concentration is due to the effect of near-surface southward wind transport in the presence of a certain vertical exchange of PMT 2.5). The transport and diffusion mechanism of atmospheric pollutants mentioned above can explain to a certain extent the phenomenon that the height of the mixed layer increases during the day and the PMSP 2.5) concentration increases in the near strata under the background of heavy pollution in the region.
【作者單位】： 中國氣象局北京城市氣象研究所;京津冀環(huán)境氣象預(yù)報預(yù)警中心;
【基金】：國家自然科學(xué)基金資助項目(41305130,41575010) 國家科技支撐計劃資助項目(2014BAC23B03,2014BAC16B04) 北京市自然科學(xué)基金資助項目(8161004) 北京市科技計劃課題(Z151100002115045)
【分類號】：X51
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本文編號：1562632