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991.
992.
By using a low-order,two-layer baroclinic quasi-geostrophic model,a nonlinear system including the interaction between a thermal forced wave,a transient wave and zonal flow is studied. Under the conditions of near-resonance and weak baroclinic instability,the features of solution in phase space are discussed with the analytical methods of multiple scale and discontinuous oscillation.The results show that the dynamic coupling between forced wave and transient wave is responsible for the physical mechanism of the non-uniform index cycle of the atmospheric circulation. 相似文献
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热带气旋远距离暴雨过程的诊断分析 总被引:15,自引:3,他引:15
利用天气实况和NCEP再分析资料,对2004年8月26—28日山东大暴雨过程进行了客观分析。结果表明,0418号热带气旋在福建沿海登陆后,其北伸倒槽与西风带弱冷空气结合造成了本次大暴雨过程,具有明显的中低纬系统相互作用特征。伴随登陆热带气旋生成的低空东南急流为暴雨输送了丰富的热量和水汽,成为联系中低纬度系统的纽带。西风带弱冷空气侵入台风北伸倒槽后,在黄淮之间有明显的暖锋锋生特征,是触发倒槽区域中尺度对流发展和暴雨产生的重要动力机制。暴雨与高能舌区具有很好的对应关系,总能量分布对热带气旋远距离暴雨的落区具有很好的指示作用。 相似文献
996.
This paper has investigated the rise of bent-over buoyant plume in neutral condition.By means of the combined-effect model proposed at earlier time,authors have deduced a formula of final rise limited by mechanical turbulence and therefore have concluded that the corresponding formula neglecting the accumulated effect of ambient turbulence is only its particular case.By analyzing the function relation of the various affecting factors with the plume rise in the existing equations,it is proved that the formula derived from the combined-effect model is the most reasonable and shows more conformity to the observations. 相似文献
997.
By using a surface air temperature index (SATI) averaged over the eastern Tibetan Plateau (TP),
investigation is conducted on the short-term climate variation associated with the interannual air warming
(or cooling) over the TP in each summer month. Evidence suggests that the SATI is associated with a consistent
teleconnection pattern extending from the TP to central-western Asia and southeastern Europe. Associated
rainfall changes include, for a warming case, a drought in northern India in May and June, and a stronger
mei-yu front in June. The latter is due to an intensified upper-level northeasterly in eastern China and
a wetter and warmer condition over the eastern TP. In the East Asian regions, the time-space distributions
of the correlation patterns between SATI and rainfall are more complex and exhibit large differences from
month to month. Some studies have revealed a close relationship between the anomalous heating over the TP
and the rainfall anomaly along the Yangtze River valley appearing in the summer on a seasonal mean time-scale,
whereas in the present study, this relationship only appears in June and the signal's significance becomes
weaker after the long-term trend in the data was excluded. Close correlations between SATI and the convection
activity and SST also occur in the western Pacific in July and August: A zonally-elongated warm tone in the
SST in the northwestern Pacific seems to be a passive response of the associated circulation related to a
warm SATI. The SATI-associated teleconnection pattern provides a scenario consistently linking the broad
summer rainfall anomalies in Europe, central-western Asia, India, and East Asia. 相似文献
998.
A dataset of global ocean surface currents for 1999-2007 derived from Argo float trajectories: Comparison with surface drifter and TAO measurements 下载免费PDF全文
A dataset of surface current vectors with error estimate from 1999 to 2007 is derived from the trajectories of the Array for Real-time Geostrophic Oceanography (Argo) drifting on surface over the global ocean. The error of the estimated surface currents is about 4.7 cm s-1 which is equivalent to the accuracy of the currents determined from the surface drifters. Geographically, the Argo-derived surface currents can fill many gaps left by the Global Drifter Program due to the greater number of floats, and can provide a complementary in situ observational system for monitoring global ocean surface currents. The surface currents from the Argo floats are compared with the surface drifter-derived currents and the Tropical Atmosphere Ocean program (TAO) measurements. The comparisons show good agreement for both the current amplitude and the direction of surface currents. Results indicate the feasibility of obtaining ocean surface currents from the Argo array and of combining the surface currents from Argo and the ocean surface drifters for in situ mapping of the global surface currents. The authors also make the dataset available to users of interest for many types of applications. 相似文献
999.
The Antarctic oscillation-East Asian summer monsoon connections in NCEP-1 and ERA-40 总被引:2,自引:0,他引:2
Connections between the spring Antarctic Oscillation(AAO)and the East Asian summer monsoon (EASM)in two reanalysis datasets—NCEP-1(NCEP/NCAR Reanalysis 1)and ERA-40(ECMWF 40- year Reanalysis)—are investigated in this study.Both show significant correlation between AAO and EASM rainfall over the Yangtze River valley,especially after about 1985.Though ERA-40 shows weaker anomalous signals connecting AAO and EASM over southern high latitudes than NCEP-1,both datasets reveal similar connecting patterns between ... 相似文献
1000.