CAJ | 학술논문

2011年6月28—30日广东南部沿海及珠江三角洲地区发生连续强降水过程,其中29日强降水发生在季风涌背景下。采用常规气象资料、区域自动站资料以及NCEP/NCAR分辨率1°×1°再分析资料,着重分析29日受季风涌影响的强降水成因。结果表明,此次过程发生在季风槽偏强的背景下,季风涌的爆发和加强主要表现在低空急流的增强上;无论时间上和空间上,低空急流与强降水均有很好的对应关系,其左侧的强辐合与高层的强辐散相配合,是强降水发生发展的原因之一;季风涌爆发后,不稳定能量得到再次积累,大气维持高温高湿的条件不稳定状态,有利于降水增大和维持。
2011년6월28—30일엄동남부연해급주강삼각주지구발생련속강강수과정,기중29일강강수발생재계풍용배경하。채용상규기상자료、구역자동참자료이급NCEP/NCAR분변솔1°×1°재분석자료,착중분석29일수계풍용영향적강강수성인。결과표명,차차과정발생재계풍조편강적배경하,계풍용적폭발화가강주요표현재저공급류적증강상;무론시간상화공간상,저공급류여강강수균유흔호적대응관계,기좌측적강복합여고층적강복산상배합,시강강수발생발전적원인지일;계풍용폭발후,불은정능량득도재차적루,대기유지고온고습적조건불은정상태,유리우강수증대화유지。
A continuous torrential rain case occurred in the south coastal areas and Pearl River delta region of Guangdong province during June 28-30, 2011. And on June 29, the heavy rain happened against the background of the monsoon surge. By using conventional observation data, data from regional automatic station and NECP/NCAR 1° × 1° 6-hourly reanalysis data, the analysis is made mainly on the cause of the torrential rain affected by the monsoon surge on June 29. The results show that this process occurred against the background of the stronger monsoon trough. The breakout and increase of monsoon surge showed mainly the strengthening of low level jet. There is a good correspondence between the low-level jet and heavy precipitation temporally and spatially. The coordination between the strong convergence on the left side of low-level jet and the strong high-level convergence is one of the reasons for the occurrence and development of heavy precipitation. After the outbreak of the monsoon surge, the unstable energy accumulated again. This is conducive to the precipitation increase and maintenance.