Global surface temperature in relation to northeast monsoon rainfall over Tamil Nadu

Journal of Earth system science

S Sridharan1¹  R Asokan1¹  S Balachandran1¹ 

[1] Regional Meteorological Centre, 50(New 6) College Road, Chennai 600 006, India.$$

关键词: Global surface temperature anomaly;    northeast monsoon rainfall;    teleconnection;    north Atlantic oscillation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The local and teleconnective association between Northeast Monsoon Rainfall (NEMR)over Tamil Nadu and global Surface Temperature Anomalies (STA)is examined using the monthly grid-ded STA data for the period 1901-2004.Various geographical regions which have significant tele-connective signals associated with NEMR are identi fied.During excess (deficient)NEMR years,it is observed that the meridional gradient in surface air temperature anomalies between Europe and north Africa,in the month of September is directed from the subtropics (higher latitudes)to higher latitudes (subtropics).It is also observed that North Atlantic Oscillation (NAO)during September in fluences the surface air temperature distribution over north Africa and Europe.Also,the NAO index in January shows significant inverse relationship with NEMR since recent times.The central and eastern equatorial Pacific oceanic regions have signi ficant and consistent positive correlation with NEMR while the western equatorial region has significant negative correlation with NEMR. A zonal temperature anomaly gradient index (ZTAGI)de fined between eastern equatorial Pacific and western equatorial Pacific shows stable significant inverse relationship with NEMR.

【 授权许可】

Unknown