CAJ | 학술논문

利用自动站、Micaps、雷达风廓线等资料和6h间隔的NCEP1°×1°再分析资料，对浙江2011年1月20日强降雪过程中降雪带南压的成因进行了诊断分析。结果表明：高空槽、中低县切变配合近地面的冷空气渗透影响是强降雪发生的有利天气尺度背景；强降雪发生在低空西南急流左侧水汽通量散度的辐合区内，且低空西南急流的南压领先于降雪带的南压，700hPa风速辐合线位置与降雪带前沿位置有较好的一致性；湿位涡斜压项的发展和移动与降雪带的南压有较好的一致性；850hPa冷平流的南扩和800-600hPa之间强暖平流的南伸，推动了降雪带的南压；雷达风廓线指示的低层冷平流作用比单站降雪开始时间早数小时，对本站温度条件的改变和降雪区的南压趋势有提前预示作用，可作为类似过程降水性质转换的参号依据之一。
이용자동참、Micaps、뢰체풍곽선등자료화6h간격적NCEP1°×1°재분석자료，대절강2011년1월20일강강설과정중강설대남압적성인진행료진단분석。결과표명：고공조、중저현절변배합근지면적랭공기삼투영향시강강설발생적유리천기척도배경；강강설발생재저공서남급류좌측수기통량산도적복합구내，차저공서남급류적남압령선우강설대적남압，700hPa풍속복합선위치여강설대전연위치유교호적일치성；습위와사압항적발전화이동여강설대적남압유교호적일치성；850hPa랭평류적남확화800-600hPa지간강난평류적남신，추동료강설대적남압；뢰체풍곽선지시적저층랭평류작용비단참강설개시시간조수소시，대본참온도조건적개변화강설구적남압추세유제전예시작용，가작위유사과정강수성질전환적삼호의거지일。
This paper uses automatic station data, Micaps data, radar wind profiler data and 6 h intervals NCEP 1° ×1 ° reanalysis data to analyze and diagnose the causes for snowfall belt southward of Zhejiang on 20th January, 2011. Results show that high-level trough and low-level wind shear with the infiltration of cold air near ground provide the favorable weather scale background which heavy snow occurred to. Heavy snowfall occurred in the water vapor flux divergence convergence zone which on the left of the low-southwestern jet and jet stream southward ahead of the snowfall belt southward. The 700 hPa wind convergence line position with the leading edge of snowfall belt are in good agreement. The develop- ment and movement of moist potential vorticity baroclinic term is in good relationship with snowfall belt southward. South stretch of 850 hPa cold advection and strong warm advection between 800 hPa to 600 hPa promote the snowfall belt southward. Radar wind profiles indicated low-level cold advection began several hours earlier than the single station snowfall. Low-level cold advection can indicate the site ten〉 perature change and snowfall belt southward in advance, so it could be used as a one of the reference that can indicate the conversion of the nature of precipitation in other similar snowfall processes.