CAJ | 학술논문

2009年秋季至2010年初夏,云南遭受了有资料记录以来最严重的干旱,其中2009年秋季是有资料记录以来降水偏少最明显的年份,全省平均降水比历年同期偏少50%以上。通过诊断方法分析了云南秋季降水和大气环流异常的特征,结果表明在多年平均情况下,云南秋季大部分地区的降水占年降水总量的20%以上,对年降水量的变化有重要影响;2009年秋季云南区域大气低层的水汽持续偏少、高层辐合低层辐散的高低层流场配置是这次干旱产生的最直接原因;另外,持续偏西偏强的西太平洋副热带高压、弱冷空气和弱暖湿气流活动,以及北方冷空气与南方暖湿气流影响云南的不同步、夏季风环流的提前结束等都对这次干旱过程产生了重要的影响。
2009년추계지2010년초하,운남조수료유자료기록이래최엄중적간한,기중2009년추계시유자료기록이래강수편소최명현적년빈,전성평균강수비력년동기편소50%이상。통과진단방법분석료운남추계강수화대기배류이상적특정,결과표명재다년평균정황하,운남추계대부분지구적강수점년강수총량적20%이상,대년강수량적변화유중요영향;2009년추계운남구역대기저층적수기지속편소、고층복합저층복산적고저층류장배치시저차간한산생적최직접원인;령외,지속편서편강적서태평양부열대고압、약랭공기화약난습기류활동,이급북방랭공기여남방난습기류영향운남적불동보、하계풍배류적제전결속등도대저차간한과정산생료중요적영향。
From autumn 2009 to early summer 2010,Yunnan has suffered a most serious drought disaster.In this drought process,autumn rainfall is the least since the data record and its anomalous precipitation percentage exceeds-50%.Based on diagnostic analysis,the anomalous characteristics of autumn rainfall and atmospheric circulation are investigated.Results show that the autumn rainfall accounts for more than 20% of annual rainfall.The continuously less water vapor from low to high levels,the convergence at lower level companied with divergence at higher level over Yunnan region directly result in the drought.Otherwise,the continuously strong subtropical high over the western Pacific,the weak cold air and the weak warm and wet flow as well as their out-phase effects,the early retreat of summer monsoon circulation also play significant role on this drought.