CAJ | 학술논문

2014年秋季，全国平均降水量较常年同期偏多，其中华西地区降水偏多明显。季内，我国华西地区降水阶段性变化显著。分析表明，秋季华西地区降水偏多可能与热带印度洋海温偏高有关。印度洋海温偏高，一方面有利于西北太平洋地区对流层低层异常反气旋式环流的发展和东南水汽输送的加强，另一方面印度洋海温的偏高有利于印度洋地区对流的活跃和西南水汽输送的加强。在中高纬地区，贝加尔湖地区为异常低槽区，易引导冷空气南下影响我国华西地区。同时，西太平洋副热带高压强度偏强及西伸脊点的偏西，综合导致华西地区秋季降水偏多。而华西地区降水的季内变化与西太平洋副热带高压的异常活动有关。
2014년추계，전국평균강수량교상년동기편다，기중화서지구강수편다명현。계내，아국화서지구강수계단성변화현저。분석표명，추계화서지구강수편다가능여열대인도양해온편고유관。인도양해온편고，일방면유리우서북태평양지구대류층저층이상반기선식배류적발전화동남수기수송적가강，령일방면인도양해온적편고유리우인도양지구대류적활약화서남수기수송적가강。재중고위지구，패가이호지구위이상저조구，역인도랭공기남하영향아국화서지구。동시，서태평양부열대고압강도편강급서신척점적편서，종합도치화서지구추계강수편다。이화서지구강수적계내변화여서태평양부열대고압적이상활동유관。
During the autumn of 2014,mean precipitation over China was above normal,especially in West China with strong intraseasonal variations.Analysis shows that the positive precipitation anomaly over West China is possibly caused by the warming over the tropical Indian Ocean.The warming of the tropical Indian Ocean enhances the low-level anticyclonic anomaly over the Northwest Pacific and southeast water vapor transportation to West China,and also intensifies the convectional activity over Indian Ocean and southwest water vapor transportation to West China.At the mid-high latitude,abnormal trough maintains over the Lake Baikal,which is prone to guide the cold air down to West China.At the same time,the in-tensified western Pacific subtropical high (WPSH),whose high ridge extends more westward,also brings more water vapor from the low latitude to West China.As a result,the intensified water vapor and the northwestward cold air flow leads to the positive precipitation anomaly over West China during autumn of 2014.Furthermore,the intraseasonal variation of the autumn precipitation over West China is influenced by the WPSH .