無錫梅雨期濕沉降綜合分析

doi:10.3969/2016jms.0010

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無錫梅雨期濕沉降綜合分析
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                        10.3969/2016jms.0010
                    
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基金項目:江蘇省自然科學基金資助項目（BK20130111）；江蘇省氣象局重點項目（KZ201405）；國家科技支撐計劃項目（2014BAC22B04）；華東區(qū)域氣象中心聯(lián)合項目（201401）

Comprehensive analysis of wet deposition during the Meiyu period in Wuxi

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利用2008-2014年梅雨期間酸雨觀測資料及2014年6月16-27日降水個例加密采樣資料，結合大氣污染物資料分析了近7 a無錫梅雨期酸雨特征，研究降水過程中空氣污染物、pH值、電導率的變化及降水對污染物的清除作用。結果表明：無錫市梅雨期酸雨年平均pH值呈現(xiàn)逐年遞增趨勢。降水過程中，顆粒物質量濃度顯著降低；氣體濃度變化受其自身日變化及排放源影響大于雨水的清除作用；樣品的pH值、K值每個過程變化并不一致，K值變化與顆粒物質量濃度變化大致保持一致。降水、風對顆粒物質量濃度影響大于對氣體濃度的影響。長時間連續(xù)降水時，降水對顆粒污染物的清除存在極限。小時雨量在0~0.5 mm時，降水對顆粒物濃度做負清除，其值反而略有增加；小時雨量在0.6~5.0 mm時，降水對顆粒物質量濃度做正清除；小時雨量達到5.1 mm及以上時，對PM_2.5和PM_2.5-10做正清除，對PM₁₀做負清除。降水對SO₂有稀釋清除作用；對NO₂的稀釋作用取決于其開始濃度值；對CO、O₃的清除作用不顯著。

Abstract:

By using the acid rain observation data during the Meiyu period from 2008 to 2014, the precipitation and the air pollutant data during 16-27 June 2014, the characteristics of the acid rain in recent 7 years and the scavenging effect of the changes of the air pollutant, pH value, K value and the orecipitation on the pollutant were analyzed. Results show that the average pH value of acid rain during the Meiyu period increased yearly in Wuxi. The concentration of air pollutants in the precipitation process significantly decreased, which was affected more by its durnal variation and emission source than by rainfall. The pH and K value were inconsistent during each precipitation. The K value was consistent with the particulate concentration. The effects of precipitation and wind on the particulate matter concentration was greater than that on gas. There is a limit of removal effect on particulate matter for long-time precipitation. When the hourly precipitation was between 0 mm and 0.5 mm, the scavenging effect was negative. When the hourly precipitation was between 0.6 mm and 5.0 mm, the scavenging effect was positive. When the hourly precipitation was more than 5.0 mm, the scavenging effect on PM2.5 and PM2.5-10 was positive, but for PM10, it was negative. Precipitation has a dilution effect on SO₂.The dilution effect on NO₂ depends on its starting concentration, and the removal effect is not significant on CO and O₃.

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蘇艷,劉端陽,彭華青,周彬,趙兵.無錫梅雨期濕沉降綜合分析.氣象科學,2016,36(4):547-555 SU Yan, LIU Duanyang, PENG Huaqing, ZHOU Bin, ZHAO Bing. Comprehensive analysis of wet deposition during the Meiyu period in Wuxi. Journal of the Meteorological Sciences,2016,36(4):547-555

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收稿日期:2015-08-09
最后修改日期:2015-12-29
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在線發(fā)布日期: 2016-09-07
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