Indian Ocean Dipole : Assessing its impacts on the Indian Summer Monsoon Rainfall (ISMR) across North East India

被引:0
|
作者
Sarkar, Parthapratim [1 ]
Janardhan, Prashanth [1 ]
Roy, Parthajit [1 ]
机构
[1] Natl Inst Technol, Dept Civil Engn, Silchar 788010, Assam, India
来源
MAUSAM | 2021年 / 72卷 / 04期
关键词
Dipole mode index; Indian ocean dipole; Indian summer monsoon rainfall; Sea surface temperatures; Northeast India; EQUATORIAL PACIFIC; EVENTS; VARIABILITY; MODE; JET;
D O I
暂无
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The Indian Ocean Dipole (IOD), a climatic anomaly, results in sustained sea surface temperature (SST) variations between tropical western and eastern Indian Ocean temperatures. In this study, we studied the variations to inculcate the teleconnections between IOD and Indian summer monsoon rainfall (ISMR) distribution across the country for the period 1960-2020 for all the three phases of ISMR. We analyzed rainfall, SST and low-level wind circulation anomalies for the above mentioned time horizon. Positive IOD events noticeably resulted in increase in summer monsoon rainfall distribution across the country respectively while its negative counterpart led to decrease in rainfall except for the commencement phase of ISMR. The variations in SST, wind circulation and moisture movement processes across the Indian Ocean characterize significant changes in rainfall during the positive and negative phases of IOD especially during the recent decades (1991-2020). The recent time horizon also witnesses enhanced low-level equatorial jets (LEJ) across the equatorial Indian Ocean and the Arabian Sea during the positive IOD events as compared to the prior decades (1960-1990). The effect of moisture convergence zone is also analyzed which results in above rainfall conditions across northeastern and central India. Conversely, negative IOD events were found to subdue any such moisture movement mechanisms. Furthermore, and additional investigation to analyze the effect of IOD on the retreating/withdrawal monsoon across northeast India has been done and it has been observed that a stronger positive IOD is detrimental to the seasonal rainfall (May- September) over North East India (-0.7 one month lag correlation). Furthermore, the DMI index of April-May presented a clear indication of monsoon activity over the area during the withdrawal or retreating phase of the summer monsoon, i.e., during September.
引用
收藏
页码:821 / 834
页数:14
相关论文
共 50 条
  • [1] On the relationship between north India summer monsoon rainfall and east equatorial Indian Ocean warming
    Yadav, Ramesh Kumar
    Roxy, Mathew Koll
    [J]. GLOBAL AND PLANETARY CHANGE, 2019, 179 : 23 - 32
  • [2] On the impacts of ENSO and Indian Ocean dipole events on sub-regional Indian summer monsoon rainfall
    Ashok, Karumuri
    Saji, N. H.
    [J]. NATURAL HAZARDS, 2007, 42 (02) : 273 - 285
  • [3] On the impacts of ENSO and Indian Ocean dipole events on sub-regional Indian summer monsoon rainfall
    Ashok K.
    Saji N.H.
    [J]. Natural Hazards, 2007, 42 (2) : 273 - 285
  • [4] Impact of ENSO and the Indian Ocean Dipole on the north-east monsoon rainfall of Tamil Nadu State in India
    Geethalakshmi, V.
    Yatagai, Akiyo
    Palanisamy, K.
    Umetsu, Chieko
    [J]. HYDROLOGICAL PROCESSES, 2009, 23 (04) : 633 - 647
  • [5] The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response
    Ratna, Satyaban B.
    Cherchi, Annalisa
    Osborn, Timothy J.
    Joshi, Manoj
    Uppara, Umakanth
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2021, 48 (02)
  • [6] An Indian Ocean precursor for Indian summer monsoon rainfall variability
    Sreejith, O. P.
    Panickal, S.
    Pai, S.
    Rajeevan, M.
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2015, 42 (21) : 9345 - 9354
  • [7] Indian summer monsoon rainfall and its link with ENSO and Indian Ocean climate indices
    Ihara, Chie
    Kushnir, Yochanan
    Cane, Mark A.
    De la Peña, Victor H.
    [J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2007, 27 (02) : 179 - 187
  • [8] Temperature variability over the Indian Ocean and its relationship with Indian summer monsoon rainfall
    D. R. Kothawale
    A. A. Munot
    H. P. Borgaonkar
    [J]. Theoretical and Applied Climatology, 2008, 92 : 31 - 45
  • [9] Temperature variability over the Indian Ocean and its relationship with Indian summer monsoon rainfall
    Kothawale, D. R.
    Munot, A. A.
    Borgaonkar, H. P.
    [J]. THEORETICAL AND APPLIED CLIMATOLOGY, 2008, 92 (1-2) : 31 - 45
  • [10] Large Sensitivity of Simulated Indian Summer Monsoon Rainfall (ISMR) to Global Warming: Implications of ISMR Projections
    Rajesh, P., V
    Goswami, B. N.
    Choudhury, B. A.
    Zahan, Yasmin
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2021, 126 (01)