南京信息工程大学学报
南京信息工程大學學報
남경신식공정대학학보
JOURNAL OF NANJING UNIVERSITY OF INFORMATION SCIENCE & TECHNOLOGY
2014年
4期
349-355
,共7页
中分辨率成像光谱仪( MODIS )%气溶胶%云%中国近海
中分辨率成像光譜儀( MODIS )%氣溶膠%雲%中國近海
중분변솔성상광보의( MODIS )%기용효%운%중국근해
MODIS( moderate-resolution imaging spectroradiometer)%aerosol%cloud%China offshore region
通过分析中国近海 MODIS 数据中气溶胶参数与云参数的相互关系，讨论了该区域气溶胶的间接效应及其对于云的可能影响。结果表明，在中国近海，气溶胶具有明显的间接效应，而且由于气溶胶种类和水汽的季节变化，使得气溶胶的间接作用具有很强的时间变化特征。在夏季，由于人为气溶胶占主导，它作为有效的云凝结核，使得气溶胶光学厚度（ AOT）分别与云凝结核数（ CCN）有正相关、与云滴有效半径（ CER ）有负相关性、与云光学厚度（ COT ）也存在着正相关，气溶胶的间接效应明显；在春季，由于沙尘气溶胶盛行，同时沙尘并不是很好的云凝结核，使得气溶胶光学厚度（ AOT）分别与云凝结核数（ CCN）的正相关减弱、与云滴有效半径（ CER ）则由夏季的负相关变为正相关、与云光学厚度（ COT）存在弱的负相关，气溶胶的间接效应不明显。
通過分析中國近海 MODIS 數據中氣溶膠參數與雲參數的相互關繫，討論瞭該區域氣溶膠的間接效應及其對于雲的可能影響。結果錶明，在中國近海，氣溶膠具有明顯的間接效應，而且由于氣溶膠種類和水汽的季節變化，使得氣溶膠的間接作用具有很彊的時間變化特徵。在夏季，由于人為氣溶膠佔主導，它作為有效的雲凝結覈，使得氣溶膠光學厚度（ AOT）分彆與雲凝結覈數（ CCN）有正相關、與雲滴有效半徑（ CER ）有負相關性、與雲光學厚度（ COT ）也存在著正相關，氣溶膠的間接效應明顯；在春季，由于沙塵氣溶膠盛行，同時沙塵併不是很好的雲凝結覈，使得氣溶膠光學厚度（ AOT）分彆與雲凝結覈數（ CCN）的正相關減弱、與雲滴有效半徑（ CER ）則由夏季的負相關變為正相關、與雲光學厚度（ COT）存在弱的負相關，氣溶膠的間接效應不明顯。
통과분석중국근해 MODIS 수거중기용효삼수여운삼수적상호관계，토론료해구역기용효적간접효응급기대우운적가능영향。결과표명，재중국근해，기용효구유명현적간접효응，이차유우기용효충류화수기적계절변화，사득기용효적간접작용구유흔강적시간변화특정。재하계，유우인위기용효점주도，타작위유효적운응결핵，사득기용효광학후도（ AOT）분별여운응결핵수（ CCN）유정상관、여운적유효반경（ CER ）유부상관성、여운광학후도（ COT ）야존재착정상관，기용효적간접효응명현；재춘계，유우사진기용효성행，동시사진병불시흔호적운응결핵，사득기용효광학후도（ AOT）분별여운응결핵수（ CCN）적정상관감약、여운적유효반경（ CER ）칙유하계적부상관변위정상관、여운광학후도（ COT）존재약적부상관，기용효적간접효응불명현。
Based on analysis of linear relationship between aerosol parameters and cloud parameters in MODIS da-ta,indirect aerosol effect was discussed over the China offshore region.The result showed that indirect aerosol effect indeed exists over the China offshore region.Meanwhile,indirect aerosol effect varies with time,which is a result of the changing of aerosol variety and water vapor content during different seasons.During the summer(e.g.August) time,anthropogenic aerosol is the most important component of aerosol in cloud,which is an effective cloud conden-sation nuclei.The dominance of anthropogenic aerosol,coupled with sufficient water vapor,contributes to the remark-able indirect aerosol effect in summer. The analysis results show that strong positive correlation exists between aerosol optical thickness(AOT) at 550nm and number of cloud condensation nuclei (CCN),negative correlation exists between AOT and cloud effective radius ( CER) ,and positive correlation exists between AOT and cloud opti-cal thickness(COT).While during the spring(e.g.April) time,dust is the dominant component of aerosol,which is a bad cloud condensation nuclei,and the water vapor content decreases. As a result,both the positive correlation be-tween AOT and CCN,and the negative correlation between AOT and COT,turn to be weak.While the correlation be-tween AOT and CER changes from negative in summer to weakly positive in spring.The indirect aerosol effect is not pronounced in spring over china offshore region.
