CAJ | 학술논문

利用常规观测资料、NCEP 再分析资料、微波辐射计及多普勒雷达等资料对2013年2月7—8日干雪过程、2月18—19日湿雪过程，从水汽、不稳定、动力及温湿层结方面进行对比分析，得出如下结论：（1）2月7—8日的干雪过程水汽层次浅薄，水汽输送支仅为700 hPa 弱西南气流；2月18—19日的湿雪过程水汽充沛，水汽输送支为700 hPa 强西南急流和850 hPa 东南气流。（2）干雪过程低层冷平流强，层结稳定。湿雪过程低层暖平流强，冷暖交汇使大气不稳定度增加。（3）干雪过程中弱暖湿气流沿深厚冷空气垫爬升，动力辐合位于中高层，次级环流的形成减弱上升运动。湿雪过程中弱冷空气楔入到强暖湿气流底部，迫使其抬升，形成深厚上升运动区，次级环流的形成增强上升运动。（4）干雪过程整层温度＜0℃，700 hPa出现冷性逆温层，－10℃层位于925 hPa附近，水汽密度、液态水含量、整层水汽含量较小；湿雪过程700 hPa 出现暖性逆温层，－10℃层位于500 hPa附近，水汽密度、液态水含量、整层水汽含量较大。在上述研究的基础上给出了干、湿雪形成的三维物理模型，该模型从温湿（风）垂直层结上面体现出了干、湿雪形成的主要环境背景差异，对于干、湿雪预报具有一定的参考价值。
이용상규관측자료、NCEP 재분석자료、미파복사계급다보륵뢰체등자료대2013년2월7—8일간설과정、2월18—19일습설과정，종수기、불은정、동력급온습층결방면진행대비분석，득출여하결론：（1）2월7—8일적간설과정수기층차천박，수기수송지부위700 hPa 약서남기류；2월18—19일적습설과정수기충패，수기수송지위700 hPa 강서남급류화850 hPa 동남기류。（2）간설과정저층랭평류강，층결은정。습설과정저층난평류강，랭난교회사대기불은정도증가。（3）간설과정중약난습기류연심후랭공기점파승，동력복합위우중고층，차급배류적형성감약상승운동。습설과정중약랭공기설입도강난습기류저부，박사기태승，형성심후상승운동구，차급배류적형성증강상승운동。（4）간설과정정층온도＜0℃，700 hPa출현랭성역온층，－10℃층위우925 hPa부근，수기밀도、액태수함량、정층수기함량교소；습설과정700 hPa 출현난성역온층，－10℃층위우500 hPa부근，수기밀도、액태수함량、정층수기함량교대。재상술연구적기출상급출료간、습설형성적삼유물리모형，해모형종온습（풍）수직층결상면체현출료간、습설형성적주요배경배경차이，대우간、습설예보구유일정적삼고개치。
Based on conventional weather chart,NCEP reanalysis data,microwave radiometer products and Doppler radar observations,the water vapor,thermal and dynamic conditions,temperature and humidity stratification during 7-8 (dry snow)and 18-19 (wet snow)February 2013 are comparatively analyzed. The results show that:(1 )The vapor transportation branch in dry snow process is weak southwest air current at 700 hPa,but the vapor transportation branch in wet snow process is the strong southwest air current at 700 hPa and the southeast air current at 850 hPa with sufficient moisture.(2)There is strong cold advection and stable atmospheric layer in dry snow process.However,strong warm advection exits in wet snow process in which cold and warm flow intersection makes atmospheric instability enhanced.(3 ) The southwest current ascends on the cooling cushion in dry snow process with convergence at middle-high levels,and the secondary circulation inhibits ascending motion.In wet snow process,the cold air inserts the bottom of warm flow,making warm flow lifted,and the secondary circulation supplies a continuous and powerful updrafts.(4)The temperature is lower than 0℃ at all levels with cold inversion layer and low vapor density,liquid water content and water vapor content at all levels in dry snow,and the level of -10℃ is found at 925 hPa.On the contrary,warm inversion layer exists in wet snow with high vapor density,liquid water content and water vapor content at all levels,and the level of -10℃ is at 500 hPa. Finally ,three-dimensional physical model for the formation of dry snow and wet snow is built based on the above researches.The model reflects the main environmental background difference of temperature and hu-midity air stratification,which has certain reference significance for dry and wet snow forecasting.