CAJ | 학술논문

使用NCEP/NCAR再分析等资料,从年际变化的角度,选取季风爆发前青藏高原感热加热异常强/弱年进行合成分析,结果表明:季风爆发前高原加热异常偏强,使得高层环流趋向于季节变化的方向;中、低层孟加拉湾等地区有气旋式环流、上升运动及降水增强,孟加拉湾季风爆发偏早.为进一步证实合成分析的相关结论,设计了对春季高原感热加热异常的敏感性数值试验,结果表明:高原感热加热异常对环流的影响结果与资料诊断分析基本一致,高原感热加热加强(减弱)导致孟加拉湾季风爆发偏早(偏晚).
사용NCEP/NCAR재분석등자료,종년제변화적각도,선취계풍폭발전청장고원감열가열이상강/약년진행합성분석,결과표명:계풍폭발전고원가열이상편강,사득고층배류추향우계절변화적방향;중、저층맹가랍만등지구유기선식배류、상승운동급강수증강,맹가랍만계풍폭발편조.위진일보증실합성분석적상관결론,설계료대춘계고원감열가열이상적민감성수치시험,결과표명:고원감열가열이상대배류적영향결과여자료진단분석기본일치,고원감열가열가강(감약)도치맹가랍만계풍폭발편조(편만).
Based on the NCEP/NCAR reanalysis datasets, the influence of anomalous diabatic heating over the Tibetan Plateau (TP) in spring on the Asian tropical monsoon onset were investigated by performing composite analysis. Further, an atmospheric circulation model was applied to study the possible influences of sensible heating over the TP on the Asian tropical circulation and monsoon onset. Composite results show that, before the monsoon onset, the enhancement of the TP heating will strengthen the two troughs and a ridge at the lower troposphere over the high latitude, lead the convergence of the flow to the TP, and strengthen the cyclonic circulation at the Bay of Bengal (BOB), cause the enhancement of the convection activities and increase of the rainfall over the BOB, which results in the earliest onset of summer monsoon at BOB. Numerical experiments of sensitivity have shown that when the spring TP sensible heating increase, the cyclonic circulation will strengthen at the lower troposphere around the TP, BOB and Indochina Peninsula, and the anti-cyclonic circulation will develop over the Indian Peninsula. Before the monsoon onset, the abnormal sensible heating over the TP will obviously increase the sensible heating at the Indian Peninsula, and the monsoon onset will be earlier at the BOB. Opposite results appear in the sensible heating decrease experiments.