發(fā)布時(shí)間：2018-06-02 16:15

  本文選題：環(huán)流型 + 邊界層�。� 參考：《南京信息工程大學(xué)》2015年碩士論文

【摘要】：城市的快速發(fā)展使得隨之而來的大氣環(huán)境問題備受關(guān)注。本文利用2004-2013年武漢市逐日污染物濃度資料、NCEP/NCAR再分析資料、L波段雷達(dá)資料和地面觀測(cè)資料,采用Lambert-Jenkinson環(huán)流分型法對(duì)影響武漢地區(qū)的地面環(huán)流形勢(shì)進(jìn)行分類,統(tǒng)計(jì)分析武漢地區(qū)空氣污染日的時(shí)空特征和邊界層結(jié)構(gòu)特點(diǎn),通過WRF模式模擬空氣污染生消過程中的局地氣象條件變化,探討邊界層的變化特征和局地環(huán)流在其中所起的作用,綜合分析大尺度環(huán)流背景和中小尺度局地氣象條件對(duì)武漢地區(qū)空氣污染形成的影響。利用Lamb-Jenkinson客觀環(huán)流分型法,結(jié)合主觀分析,對(duì)武漢地區(qū)大尺度環(huán)流背景場(chǎng)進(jìn)行分析,探討影響武漢地區(qū)的主要環(huán)流型及環(huán)流型與污染物濃度之間的關(guān)系。結(jié)果表明,影響武漢地區(qū)空氣污染出現(xiàn)的主要環(huán)流型有反氣旋型(A)、高壓系統(tǒng)控制的偏東風(fēng)型(AE)、偏東風(fēng)型(E)、東南風(fēng)型(SE)、弱低壓型(C)及偏東北風(fēng)型(NE),各季節(jié)較易出現(xiàn)污染的主要環(huán)流型不同。而中度及以上污染日的環(huán)流型主要為A、SE、E及AE型,受高壓系統(tǒng)或偏東風(fēng)影響時(shí),高濃度污染較易出現(xiàn)。環(huán)流型對(duì)各種污染物濃度的影響程度存在差異。在對(duì)中小尺度局地氣象條件的研究中,通過WRF模式模擬發(fā)現(xiàn),由于武漢及周邊地區(qū)三面環(huán)山,地形對(duì)流場(chǎng)影響明顯。夜間山風(fēng)與偏西北氣流和偏東氣流在武漢及周邊地區(qū)耦合,形成氣流匯聚帶,使得污染物不斷堆積,造成污染。局地環(huán)流和氣流匯聚帶隨時(shí)間變化而變化,白天基本消失,各山谷風(fēng)、偏北、偏東氣流因強(qiáng)度的不同,形成的局地環(huán)流、氣流匯聚帶位置也有所差異。在較穩(wěn)定大氣邊界層中,局地環(huán)流和氣流匯聚帶存在周期變化,有一定規(guī)律性。結(jié)合模式模擬結(jié)果與觀測(cè)結(jié)果分析發(fā)現(xiàn),武漢地區(qū)發(fā)生空氣污染時(shí),具有地域性特點(diǎn)。當(dāng)發(fā)生污染時(shí),大氣層結(jié)較穩(wěn)定,以貼地逆溫為主,逆溫強(qiáng)度較強(qiáng),逆溫層厚度較厚,混合層厚度較薄,濕度垂直層結(jié)呈上干下濕狀態(tài),中度以上污染時(shí),到達(dá)一定高度后濕度隨高度增加而增加,而輕度污染時(shí),到達(dá)一定高度后,濕度隨高度的增加而降低,地面有較小風(fēng)速,甚至靜風(fēng),有利于污染物不斷堆積。
[Abstract]:With the rapid development of cities, the following problems of atmospheric environment have attracted much attention. Based on the daily pollutant concentration data of Wuhan from 2004 to 2013 and the L band radar data and ground observation data from NCEP / NCAR reanalysis data, the surface circulation situation affecting Wuhan area is classified by Lambert-Jenkinson circulation classification method. The temporal and spatial characteristics of air pollution days and the structural characteristics of the boundary layer in Wuhan are statistically analyzed. The variation of local meteorological conditions in the process of air pollution generation and elimination is simulated by the WRF model, and the variation characteristics of the boundary layer and the role of the local circulation in it are discussed. The influence of large scale circulation background and local meteorological conditions on the formation of air pollution in Wuhan is comprehensively analyzed. By using Lamb-Jenkinson objective circulation classification method and subjective analysis, the background field of large scale circulation in Wuhan area is analyzed, and the relationship between the main circulation pattern and the concentration of pollutants in Wuhan area is discussed. The results show that The main circulation patterns affecting air pollution in Wuhan area are anticyclonic type (Ae), high pressure system controlled easterly wind type (AEN), easterly wind type (E), easterly wind type (SEN), weak low pressure type (C) and northeasterly wind type (NE). The main circulation patterns which are liable to pollution in different seasons are different. However, the circulation patterns of moderate and above pollution days are mainly ACEE and AE, and the high concentration pollution is easy to occur under the influence of high pressure system or partial easterly wind. The effect of the circulation pattern on the concentration of various pollutants is different. In the study of local meteorological conditions in small and medium scale, WRF model simulation shows that the influence of topographic convection field is obvious due to the three sides surrounding the mountains in Wuhan and its surrounding areas. At night, the mountain wind coupled with the northwest and easterly airflow in Wuhan and its surrounding areas, forming a convergence zone of air flow, resulting in the accumulation of pollutants and resulting in pollution. The local circulation and air flow convergent zone changed with time and disappeared basically during the day. The local circulation and the position of the convergence zone were also different from each valley wind, northward and eastward air flow due to the different intensity of the local circulation and the airflow convergence zone. In the stable atmospheric boundary layer, the local circulation and the air flow converging zone have periodic variation and have certain regularity. The results of model simulation and observation show that the air pollution in Wuhan has regional characteristics. When the pollution occurs, the atmospheric stratification is more stable, mainly the ground temperature inversion, the inversion intensity is stronger, the thickness of the inversion layer is thicker, the thickness of the mixed layer is thinner, the vertical layer of humidity is dry and wet, and when the pollution is more than moderate, After reaching a certain height, the humidity increases with the increase of the height, but when the pollution reaches a certain height, the humidity decreases with the increase of the height, and there is small wind speed or even static wind on the ground, which is conducive to the accumulation of pollutants.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X51;P434

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 游春華;蔡旭暉;宋宇;郭虎;;京津地區(qū)夏季大氣局地環(huán)流背景研究[J];北京大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年06期

2 高歌;;1961-2005年中國(guó)霾日氣候特征及變化分析[J];地理學(xué)報(bào);2008年07期

3 楊靜;李霞;李秦;王中偉;;烏魯木齊近30a大氣穩(wěn)定度和混合層高度變化特征及與空氣污染的關(guān)系[J];干旱區(qū)地理;2011年05期

4 郝立生;李維京;;華北區(qū)域環(huán)流型與河北氣候的關(guān)系[J];大氣科學(xué)學(xué)報(bào);2009年05期

5 金祺;銀燕;譚穩(wěn);;黃山地區(qū)復(fù)雜地形下污染氣體輸送過程的數(shù)值模擬[J];大氣科學(xué)學(xué)報(bào);2012年06期

6 張小培;銀燕;;復(fù)雜地形地區(qū)WRF模式四種邊界層參數(shù)化方案的評(píng)估[J];大氣科學(xué)學(xué)報(bào);2013年01期

7 賴紹鈞;何芬;趙汝汀;林金淦;吳毅偉;;福州市大霧天氣環(huán)流分型研究[J];氣象科技;2009年02期

8 吳兌;吳曉京;李菲;譚浩波;陳靜;曹治強(qiáng);孫弦;陳歡歡;李海燕;;1951—2005年中國(guó)大陸霾的時(shí)空變化[J];氣象學(xué)報(bào);2010年05期

9 朱彬;蘇繼鋒;韓志偉;尹聰;王體健;;秸稈焚燒導(dǎo)致南京及周邊地區(qū)一次嚴(yán)重空氣污染過程的分析[J];中國(guó)環(huán)境科學(xué);2010年05期

10 張艷;余琦;伏晴艷;馬蔚純;;長(zhǎng)江三角洲區(qū)域輸送對(duì)上海市空氣質(zhì)量影響的特征分析[J];中國(guó)環(huán)境科學(xué);2010年07期

，

本文編號(hào)：1969390