气象
氣象
기상
METEOROLOGICAL MONTHLY
2015年
1期
1-16
,共16页
青藏高原%降水系统发生频次%TRMM%中国东部%北美副热带地区
青藏高原%降水繫統髮生頻次%TRMM%中國東部%北美副熱帶地區
청장고원%강수계통발생빈차%TRMM%중국동부%북미부열대지구
Tibetan Plateau%occurrence frequency of radar precipitation feature%TRMM%eastern China%subtropical North America
利用1998—2011年夏季（6—8月）TRMM卫星资料分析青藏高原（TP）、中国东部（EC）及北美副热带西部（WNA）和东部（ENA）降水系统的发生频次，定义降水系统为TRMM测雨雷达观测到近地面有降水的相邻像元组成的个体，即RPF （Radar Precipitation Feature），将RPF分为全体RPF、大面积RPF（面积＞1000 km2）和小面积RPF（面积不＜400 km2）3组，对比分析四个区域内各组的RPF个数发生频次和RPF像元个数发生频次，主要结果如下：（1）全体RPF的个数发生频次在青藏高原地区最高，北美东部地区最低；全体RPF的降水像元个数发生频次在中国东部最高，青藏高原最低。（2）四个区域内RPF发生频次的日变化主要为单峰结构，峰值出现在当地午后至傍晚，且大面积RPF的峰值时间晚于小面积RPF的；中国东部地区RPF降水像元个数发生频次则具有双峰结构。（3）RPF降水像元个数发生频次的分析结果与以往基于地面观测降水量的分析结果相似。
利用1998—2011年夏季（6—8月）TRMM衛星資料分析青藏高原（TP）、中國東部（EC）及北美副熱帶西部（WNA）和東部（ENA）降水繫統的髮生頻次，定義降水繫統為TRMM測雨雷達觀測到近地麵有降水的相鄰像元組成的箇體，即RPF （Radar Precipitation Feature），將RPF分為全體RPF、大麵積RPF（麵積＞1000 km2）和小麵積RPF（麵積不＜400 km2）3組，對比分析四箇區域內各組的RPF箇數髮生頻次和RPF像元箇數髮生頻次，主要結果如下：（1）全體RPF的箇數髮生頻次在青藏高原地區最高，北美東部地區最低；全體RPF的降水像元箇數髮生頻次在中國東部最高，青藏高原最低。（2）四箇區域內RPF髮生頻次的日變化主要為單峰結構，峰值齣現在噹地午後至傍晚，且大麵積RPF的峰值時間晚于小麵積RPF的；中國東部地區RPF降水像元箇數髮生頻次則具有雙峰結構。（3）RPF降水像元箇數髮生頻次的分析結果與以往基于地麵觀測降水量的分析結果相似。
이용1998—2011년하계（6—8월）TRMM위성자료분석청장고원（TP）、중국동부（EC）급북미부열대서부（WNA）화동부（ENA）강수계통적발생빈차，정의강수계통위TRMM측우뢰체관측도근지면유강수적상린상원조성적개체，즉RPF （Radar Precipitation Feature），장RPF분위전체RPF、대면적RPF（면적＞1000 km2）화소면적RPF（면적불＜400 km2）3조，대비분석사개구역내각조적RPF개수발생빈차화RPF상원개수발생빈차，주요결과여하：（1）전체RPF적개수발생빈차재청장고원지구최고，북미동부지구최저；전체RPF적강수상원개수발생빈차재중국동부최고，청장고원최저。（2）사개구역내RPF발생빈차적일변화주요위단봉결구，봉치출현재당지오후지방만，차대면적RPF적봉치시간만우소면적RPF적；중국동부지구RPF강수상원개수발생빈차칙구유쌍봉결구。（3）RPF강수상원개수발생빈차적분석결과여이왕기우지면관측강수량적분석결과상사。
Using TRMM data from 1998 to 2011,occurrence frequency of radar precipitation feature (RPF) over Tibetan Plateau (TP),eastern China (EC),west subtropical North America (WNA)and east sub-tropical North America (ENA)in boreal summer (June-August)are comparatively analyzed.A RPF is defined as a three-dimensional obj ect consisting of pixels with precipitation near the ground observed by the TRMM precipitation radar.For each region,RPFs are divided into three groups:all RPF,large RPF (area larger than 1000 km2 ),and small RPF (area less than or equal to 400 km2 ).Occurrence frequency of RPF number and occurrence frequency of RPF pixel number in each group over each region are analyzed. The results are as follows:(1 )The maximum and minimum occurrence frequencies of RPF number are over TP and ENA,respectively.In contrast,the maximum and minimum occurrence frequencies of RPF pixel number are over EC and TP,respectively.(2 )Diurnal variations of occurrence frequency of RPF over the four regions mainly present a single peak in afternoon to late-afternoon,with the peak of the large RPF appearing later than that of the small RPF.In contrast,diurnal variation of occurrence frequency of RPF pixel number over EC presents double peaks.(3)Diurnal variations of occurrence frequency of RPF pixel number are consistent with those of rainfall based on rain gauge observations in previous literature.
