气象与减灾研究
氣象與減災研究
기상여감재연구
METEOROLOGY AND DISASTER REDUCTION RESEARCH
2013年
3期
63-68
,共6页
苏俐敏%郭水连%帅莉莉%何文
囌俐敏%郭水連%帥莉莉%何文
소리민%곽수련%수리리%하문
天气个例%雷达回波%气象要素%风廓线雷达产品
天氣箇例%雷達迴波%氣象要素%風廓線雷達產品
천기개례%뢰체회파%기상요소%풍곽선뢰체산품
Weather cases%Feature of radar echoes%Meteorological elements%Product feature of the wind profiler
选取江西省宜春市晴空、弱降水、强降水三类天气过程个例，结合天气形势、雷达回波、气象要素等资料，对比分析了风廓线雷达产品特征。结果表明：（1）在晴空天气背景下，风廓线雷达探测高度低，水平风速小，垂直风速正负值交替出现，大气折射率结构常数（Cn2）值最小。（2）在稳定性弱降水天气背景下，大气呈稳定状态，风廓线雷达探测高度随降水的产生而逐渐抬升，高低层有明显的风速切变，850 hPa赣南至赣东北有西南急流穿过，赣北有切变线存在，利于降水产生，垂直风速因降水影响出现朝向雷达正速度，Cn2值比晴空时大。（3）在具有产生强对流天气背景下，大气中对流强烈，风廓线雷达的水平风速增大，西南急流深厚且不断下沉，850-700 hPa有强烈的垂直切变，动力条件和水汽条件利于强降水产生，垂直风速表现为更大的朝向雷达正速度，Cn2值比弱降水时的大。
選取江西省宜春市晴空、弱降水、彊降水三類天氣過程箇例，結閤天氣形勢、雷達迴波、氣象要素等資料，對比分析瞭風廓線雷達產品特徵。結果錶明：（1）在晴空天氣揹景下，風廓線雷達探測高度低，水平風速小，垂直風速正負值交替齣現，大氣摺射率結構常數（Cn2）值最小。（2）在穩定性弱降水天氣揹景下，大氣呈穩定狀態，風廓線雷達探測高度隨降水的產生而逐漸抬升，高低層有明顯的風速切變，850 hPa贛南至贛東北有西南急流穿過，贛北有切變線存在，利于降水產生，垂直風速因降水影響齣現朝嚮雷達正速度，Cn2值比晴空時大。（3）在具有產生彊對流天氣揹景下，大氣中對流彊烈，風廓線雷達的水平風速增大，西南急流深厚且不斷下沉，850-700 hPa有彊烈的垂直切變，動力條件和水汽條件利于彊降水產生，垂直風速錶現為更大的朝嚮雷達正速度，Cn2值比弱降水時的大。
선취강서성의춘시청공、약강수、강강수삼류천기과정개례，결합천기형세、뢰체회파、기상요소등자료，대비분석료풍곽선뢰체산품특정。결과표명：（1）재청공천기배경하，풍곽선뢰체탐측고도저，수평풍속소，수직풍속정부치교체출현，대기절사솔결구상수（Cn2）치최소。（2）재은정성약강수천기배경하，대기정은정상태，풍곽선뢰체탐측고도수강수적산생이축점태승，고저층유명현적풍속절변，850 hPa공남지공동북유서남급류천과，공북유절변선존재，리우강수산생，수직풍속인강수영향출현조향뢰체정속도，Cn2치비청공시대。（3）재구유산생강대류천기배경하，대기중대류강렬，풍곽선뢰체적수평풍속증대，서남급류심후차불단하침，850-700 hPa유강렬적수직절변，동력조건화수기조건리우강강수산생，수직풍속표현위경대적조향뢰체정속도，Cn2치비약강수시적대。
Combing with the weather situation, radar echo products and meteorological elements, three types of weather cases, sunny, light precipitation and heavy precipitation, are chosen to analyze the features of the wind profiler in Yichun, respectively. The results show:(1) Under the status of sunny day, the detecting altitude of wind profiler is low with weak horizontal wind speed. The vertical wind speed values presented the positive and negative change alternately , and the value of atmospheric refractive index structure constant (Cn2) is the smallest among the three types of weather samples. (2) Under the status of light precipitation, the atmospheric condition is stable, and wind profiler radar detecting height lifts gradually with precipitation occurrence. Also, there is an obvious vertical wind shear with the shallow southwest jet at 850 hPa. And the Cn 2 value is greater than that in sunny day.(3) Under the weather status of strong convection, the horizontal wind speed of wind profiler radar increases with deep southwest jet stream and there is strong vertical shear between 850-700 hPa. The dynamic and water vapor conditions are propitious to the generation of precipitation. Vertical wind speed presents a larger positive value toward the radar. The Cn 2 value is greater than that in light precipitation day.
