CAJ | 학술논문

美国能源部大气辐射观测计划移动观测ARMAMF（atmospheric radiation measurement mobile facility）2008年首次在我国寿县开展综合观测，为研究云特性提供了很好的资料平台。本文在此次云雷达等观测资料基础上，研究了寿县秋末冬初云高、云厚、云量及其辐射特性，结果发现，寿县有76．3％的观测日有云出现，54．0％的观测时间有云覆盖，中云（以下简称M云）和高云（以下简称H云）出现频率占全部云系的76．7％，天气系统对寿县云系形成有较大影响；云底高度大于3km的降水性云（以下简称P云）出现频率占全部P云的67．7％，是云底高度小于3kmP云的5．3倍，发生在下午的降水占全部P云的47．8％，气溶胶可能对P云的这种分布有较大影响；云和气溶胶减少地面短波辐射的日均值达一99．1W／m。，其中气溶胶减少约占25．1％。不同高度和厚度云对地面辐射通量的影响有较大差异，P云产生最大的冷却效应（一201．9W／m。），厚度小于2km的H云对地面辐射通量的减少量最少（一32．9w／m。）。另外，用地面单点云辐射观测与中分辨率成像光谱仪MODIS（moderate resolution imaging spectroradiometer）资料估计结果对比发现，两种资料有较大差异，差异可达-1．9～-36．9W／m。
미국능원부대기복사관측계화이동관측ARMAMF（atmospheric radiation measurement mobile facility）2008년수차재아국수현개전종합관측，위연구운특성제공료흔호적자료평태。본문재차차운뢰체등관측자료기출상，연구료수현추말동초운고、운후、운량급기복사특성，결과발현，수현유76．3％적관측일유운출현，54．0％적관측시간유운복개，중운（이하간칭M운）화고운（이하간칭H운）출현빈솔점전부운계적76．7％，천기계통대수현운계형성유교대영향；운저고도대우3km적강수성운（이하간칭P운）출현빈솔점전부P운적67．7％，시운저고도소우3kmP운적5．3배，발생재하오적강수점전부P운적47．8％，기용효가능대P운적저충분포유교대영향；운화기용효감소지면단파복사적일균치체일99．1W／m。，기중기용효감소약점25．1％。불동고도화후도운대지면복사통량적영향유교대차이，P운산생최대적냉각효응（일201．9W／m。），후도소우2km적H운대지면복사통량적감소량최소（일32．9w／m。）。령외，용지면단점운복사관측여중분변솔성상광보의MODIS（moderate resolution imaging spectroradiometer）자료고계결과대비발현，량충자료유교대차이，차이가체-1．9～-36．9W／m。
Cloud is critical in understanding the current climate and it plays an important role in simulating potential climate change. The U. S. Department of Energy （DOE） atmospheric radiation measurement （ARM） AMF explored field campaigns that took place in Shouxian in the east of China for the first time in 2008. Based on the observational data, the study presents some preliminary results like cloud height and cloud thickness as well as cloud＇s radiative features in Shouxian during late autumn and early winter. It was found that the occurrence of clouds took 76.3 % of the observational days and 54.0% of the observational time. Middle cloud （M） and high cloud （H） occupied 76.7 % of all the clouds. The weather system is the dominant modulator in cloud formation in Shouxian. In addition, there were more middle clouds （M） transforming into precipitation cloud （P） than low （L） and high cloud （ H）, which is about 67.7 %. Precipitation occurring in the afternoon took 47.8 % of all the precipitation cloud. Aerosol affected the distribution of precipitation cloud obviously. The reduced daily meanshortwave radiation caused by the cloud and aerosol was about- 99. 1 W/m2 with aerosol contributing 25.1% of the value. We quantitatively estimate there are obvious differences in the surface radiation budget caused by the clouds of different heights and thicknesses. P cloud produces the largest cooling effect （ -201.9 W/m2） while the thickness of less than 2 km H cloud has the smallest cooling effect （ - 32. 9 W/m2 ）. There are evident differences between ground site observation and MODIS data estimation, whose value could be - 1.9-- - 36.9 W/m2.