【摘要】：利用吸濕性串聯(lián)微分電遷移粒徑分析儀(H-TDMA)開展顆粒物吸濕性測量,通過對觀測結(jié)果進(jìn)行整理,并結(jié)合其他研究成果對我國不同環(huán)境下亞微米顆粒物吸濕性進(jìn)行表征.梳理了包括城市、鄉(xiāng)村、高山和郊區(qū)近海岸點不同大氣環(huán)境下11個觀測點的測量數(shù)據(jù),發(fā)現(xiàn)不同環(huán)境、不同季節(jié)的大氣顆粒物來源不同,顆粒物吸濕性、粒徑分布及模態(tài)分布特征差異大.城市點的吸濕參數(shù)?觀測值約為0.1~0.3;鄉(xiāng)村點比城市點略高,約0.15~0.4;高山點(118.11°E,30.07°N)的?約為0.2~0.3;郊區(qū)近海岸點(114.17°E,22.28°N)的?約為0.2~0.4.除北京郊區(qū)點(懷柔冬季觀測)外,其余鄉(xiāng)村點和城市點均觀測到亞微米顆粒物吸濕性隨粒徑增加而增強(qiáng);高山點和郊區(qū)近海岸點的顆粒物吸濕性隨粒徑的變化不顯著.除高山點(黃山)觀測到較高頻率的單模態(tài)分布(只有吸濕模態(tài))外,其他觀測點均呈現(xiàn)2~3個模態(tài)分布,說明顆粒物呈外混態(tài).北京和杭州的H-TDMA觀測結(jié)果顯示顆粒物吸濕性隨著相對濕度(RH)的增加而增加,沒有表現(xiàn)出與純硫酸銨類似的潮解行為.顆粒物吸濕性與化學(xué)組分的閉合研究發(fā)現(xiàn),與離線膜采樣獲取的化學(xué)組分相比,高時間分辨率的在線化學(xué)粒徑譜分布信息可以有效提高閉合度,同時有機(jī)物的密度與吸濕性,黑碳顆粒物質(zhì)量濃度譜分布的精確估算將進(jìn)一步提高閉合度.
[Abstract]:The hygroscopicity of particles was measured by hygroscopicity series differential electromigration particle size analyzer (H-TDMA). The hygroscopicity of submicron particles in different environments in China was characterized by sorting out the observed results and combining with other research results. The measured data of 11 observation points in different atmospheric environments, including urban, rural, alpine and suburban coastal points, are combed. It is found that the sources of atmospheric particles in different environments and seasons are different, and the hygroscopicity, particle size distribution and modal distribution characteristics of particles are very different. The moisture absorption parameters of the city point? The observed value is about 0.1 鈮，

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