本文關(guān)鍵詞：北京近郊大氣混合層結(jié)構(gòu)特征觀測分析　出處：《南京信息工程大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 激光雷達(dá) 灰霾 大氣混合層

【摘要】：隨著工業(yè)化、城市化的迅速發(fā)展,人為排放到大氣中的氣溶膠粒子含量不斷增加,霾天氣頻發(fā)。對人類的身體健康、氣候變化和生態(tài)、環(huán)境都造成了很大的影響。目前對于灰霾發(fā)生期間大氣垂直方向上污染特征的研究較少。當(dāng)污染源排放確定后,大氣混合層高度(MLH)對灰霾是否發(fā)生及輕重有重大影響,且灰霾的發(fā)生也能引起大氣混合層高度的變化。本文采用激光雷達(dá)對河北香河大氣混合層進(jìn)行了近一年半時(shí)間的觀測,并結(jié)合氣象條件對大氣混合層的日變化等進(jìn)行了研究。結(jié)果表明,MLH的日變化同溫度的變化、風(fēng)速密切相關(guān),相關(guān)系數(shù)達(dá)0.968和0.580。春季各個(gè)時(shí)刻的MLH明顯高于秋、冬兩個(gè)季節(jié)；秋冬兩季混合層的發(fā)展相似,MLH較低,大體上秋季的MLH高于冬季�；姻蔡燧^高的氣溶膠含量使得它的大氣溫度高于非灰霾天。風(fēng)速變化對灰霾天MLH的影響更大。其次,分析了觀測期間MLH的月變化及季節(jié)變化特征�；旌蠈釉�4、5月發(fā)展最為旺盛。10月至2月混合層發(fā)展較弱。因此,當(dāng)從地面排放的氣溶膠含量一定時(shí),在4、5月份氣溶膠垂直方向的擴(kuò)散范圍和擴(kuò)散速度較快,不易形成灰霾天氣。而10月至2月,混合層在垂直方向上的發(fā)展范圍和速度都較小,不利于氣溶膠在垂直方向上的輸送,氣溶膠粒子易在近地面聚集,形成灰霾天氣。最后對各個(gè)季節(jié)不同程度霾天氣下的MLH日變化及氣象條件進(jìn)行了個(gè)例分析。2006年10月30日和11月8日能見度的差異主要是由于風(fēng)速造成的。2007年5月26日和3月24日的能見度是由這兩天非常大的溫度差異引起的。2007年2月8日和2月23日能見度有可能是由于2月8日排放到大氣的總污染物過多造成的。
[Abstract]:With the rapid development of industrialization, city, anthropogenic emissions to aerosol content in the atmosphere is increasing, haze frequently. On human health, climate change and ecological environment have caused a great impact. The occurrence of haze in the atmosphere during the vertical study on pollution characteristics of pollution emissions when less. After determining the atmospheric mixing height (MLH) have a significant impact on the occurrence and severity of occurrence of haze, haze and can cause atmospheric mixed layer height changes. This paper uses the laser radar observation has been nearly a year and a half of the Hebei Xianghe atmospheric mixed layer, and combined with the meteorological conditions of the atmospheric mixed layer on the change was studied. The results show that diurnal variations of MLH with temperature and wind speed are closely related, the correlation coefficient was 0.968 and the 0.580. spring each time MLH was significantly higher than that in autumn, winter two season The development section; two seasons of autumn and winter mixed layer is similar to that of MLH is relatively low, in autumn than in winter. The content of MLH aerosol haze days high atmospheric temperature makes it higher than in non haze days. The effect of wind speed change on haze days MLH. Secondly, analyzes the changes of monthly variation and seasonal characteristics observed during MLH the mixed layer at 4,5 months. The development of the most exuberant.10 months to February mixed layer development is weak. Therefore, when a certain aerosol emissions from the ground, spread in the vertical direction of 4,5 in aerosol and spread quickly, is not easy to form haze. And from October to February, the development of mixed layer range in the vertical direction and the speed is small, is not conducive to the transport of aerosols in the vertical direction, the aerosol particles easily in the near surface aggregation of haze formation. Finally, the diurnal changes of MLH of each season in different degrees under haze weather and meteorological conditions. The difference between the case analysis of.2006 in October 30th and November 8th the visibility is mainly due to wind speed caused by the.2007 in May 26th and March 24th, the visibility is caused by these two days is very large temperature difference of.2007 in February 8th and February 23rd have visibility may be due to the February 8th total pollutant emissions to the atmosphere caused by too much.

【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)】：P412;P421.3;X51

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本文編號(hào)：1360143