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Winter surface air temperature variation over Pakistan during 1970-2014 and its principal drivers in the tropical ocean
Karim, Rizwan1,2; Tan, Guirong1,2; Ayugi, Brian3; Alriah, Mohamed Abdallah Ahmed4; Ngoma, Hamida5
2023
Source PublicationJOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume242Issue:xPages:-
Abstract

This study examined the leading modes of Dec-Feb (DJF) month's surface temperature (DJFTs) and associated mechanisms of the most significant drivers affecting temperature variability during the season from 1970 to 2014. EOF1 of DJF temperature reveals uniform spatial patterns over most of Pakistan, except extreme north, accounting for 84.38% of the total variance. The typical warm (cold) years were 1970, 1981, 1988, 1990, 1993, 2004, 2006, 2009, 2010 (1972, 1974, 1975, 1984, 2008, 2012). Favorable atmospheric conditions for warm temperature events (DJFTs) in Pakistan is an anomalous anticyclone spread over northeast Pakistan to Tibet at low to upper levels. This condition is controlled by the south and western part, of which there are significant southerly and convergent flows at low level with ascending motion over the study area. Further, examination revealed a close relationship of warm DJFTs with Western Indian Ocean warming and Eastern Indian Ocean indices but insignificant relation with the Nino3.4 index. Ocean warming related to Dipole Mode Index over eastern Indian Ocean (DMIE) is more influential (r = 0.51) than over the western Indian Ocean (DMIW) index (r = 0.37). The Ocean warming related to DMIE (EIOW), especially in Nov-Dec-Jan (NDJ) season, forced a sig-nificant ascending motion locally and then induced warm DJFTs-associated circulation pattern, propagating northward to Europe. By the dynamic diagnosis, the adiabatic and diabatic heating for the warm DJFTs is not remarkable. However, the horizontal temperature advection is positive and significant over most parts of Pakistan, both in the DJF and NDJ season, from the surface to the top of the troposphere. It suggests that the warm temperature advection is the possible prominent way of the EIOW on the warm DJFTs.

KeywordDJFmonth?S temperature events (DJFTs) Dipole mode index-eastern (DMIE) Empirical orthogonal function (EOF) Composite analysis Advection
Subject AreaGeochemistry & Geophysics ; Meteorology & Atmospheric Sciences
DOI10.1016/j.jastp.2022.105996
Indexed BySCI
Language英语
WOS IDWOS:000906266900001
Citation statistics
Document Type期刊论文
Identifierhttps://ir.xtbg.ac.cn/handle/353005/13355
Collection其他
Affiliation1.Univ Chinese Acad Sci, Sci Res Ctr Xishuangbanna Trop Bot Garden, Xishuangbanna, Yunnan, Peoples R China
2.Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ KLME, Joint Int Res Lab Climate & Environm Change ILCEC, Nanjing 210044, Peoples R China
3.Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteorol, Nanjing 210044, Peoples R China
4.Seoul Natl Univ Sci & Technol, Dept Civil Engn, Seoul 01811, South Korea
5.Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing 210044, Peoples R China
6.Univ Connecticut, Dept Geosci, Storrs, CT 06269 USA
Recommended Citation
GB/T 7714
Karim, Rizwan,Tan, Guirong,Ayugi, Brian,et al. Winter surface air temperature variation over Pakistan during 1970-2014 and its principal drivers in the tropical ocean[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2023,242(x):-.
APA Karim, Rizwan,Tan, Guirong,Ayugi, Brian,Alriah, Mohamed Abdallah Ahmed,&Ngoma, Hamida.(2023).Winter surface air temperature variation over Pakistan during 1970-2014 and its principal drivers in the tropical ocean.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,242(x),-.
MLA Karim, Rizwan,et al."Winter surface air temperature variation over Pakistan during 1970-2014 and its principal drivers in the tropical ocean".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 242.x(2023):-.
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