Influence of the strongest positive Indian Ocean Dipole and an El Nino Modoki event on the 2019 Indian summer monsoon

被引:7
|
作者
Sankar, Syam [1 ]
Vijaykumar, P. [1 ]
Abhilash, S. [1 ,2 ]
Mohanakumar, K. [1 ]
机构
[1] Cochin Univ Sci & Technol CUSAT, Adv Ctr Atmospher Radar Res ACARR, Kochi 682022, Kerala, India
[2] Cochin Univ Sci & Technol CUSAT, Dept Atmospher Sci, Kochi 682016, Kerala, India
关键词
Indian Summer Monsoon Rainfall; Indian Ocean Dipole; El Nino Modoki; Walker circulation; Sea surface temperature; SEA-SURFACE TEMPERATURE; RAINFALL; ENSO; WITHDRAWAL; ANOMALIES; TREND; SST;
D O I
10.1016/j.dynatmoce.2021.101235
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The year 2019 experienced an excess monsoon season over the Indian region, with the seasonal rainfall being 110 % of the long period average (LPA). Several zones across the country suffered multiple extreme rainfall events and flood situations resulting in a massive loss of life and property. The first half of 2019 experienced a moderate El Nino Modoki event that lasted till midsummer. Another important feature of 2019 was the strongest recorded positive Indian Ocean Dipole (IOD) that lasted approximately seven months from May to November. This study has examined the reasons for the intra-seasonal variability of rainfall over India during the 2019 monsoon using available remote sensing and reanalysis data. Our analysis has shown that the presence of El Nino and the formation of a very severe cyclonic storm (VSCS) in the Arabian Sea were unfavorable for the monsoon onset and its northward advancement during June. However, the Walker circulation associated with El Nino helped strengthen the IOD developed early in the Indian Ocean, much before the monsoon onset. The anomalously strong IOD strengthened the monsoon circulation during July-September and resulted in excess rainfall over India.
引用
收藏
页数:12
相关论文
共 50 条
  • [31] Basin-wide warming of the Indian Ocean during El Nino and Indian Ocean dipole years
    Chowdary, J. S.
    Gnanaseelan, C.
    [J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2007, 27 (11) : 1421 - 1438
  • [32] Influence of subtropical circulation systems on the changing El Nino-Indian summer monsoon relationship
    Wilson, Shinu Sheela
    Mohanakumar, K.
    [J]. ATMOSPHERIC RESEARCH, 2021, 252 (252)
  • [33] Relationship between Indian Ocean dipole mode and summer monsoon
    Bala, Indu
    Singh, O. P.
    [J]. MAUSAM, 2008, 59 (02): : 167 - 172
  • [34] Different impacts of various El Nino events on the Indian Ocean Dipole
    Wang, Xin
    Wang, Chunzai
    [J]. CLIMATE DYNAMICS, 2014, 42 (3-4) : 991 - 1005
  • [35] Two-year consecutive concurrences of positive Indian Ocean Dipole and Central Pacific El Nino preconditioned the 2019/2020 Australian "black summer" bushfires
    Wang, Guojian
    Cai, Wenju
    [J]. GEOSCIENCE LETTERS, 2020, 7 (01)
  • [36] Timing of El Nino-related warming and Indian summer monsoon rainfall
    Ihara, Chie
    Kushnir, Yochanan
    Cane, Mark A.
    Kaplan, Alexey
    [J]. JOURNAL OF CLIMATE, 2008, 21 (11) : 2711 - 2719
  • [37] A diagnostic study of the Indian Ocean dipole mode in El Nino and non-El Nino years
    Drbohlav, Hae-Kyung Lee
    Gualdi, Silvio
    Navarra, Antonio
    [J]. JOURNAL OF CLIMATE, 2007, 20 (13) : 2961 - 2977
  • [38] Seasonal transition of SST anomalies in the tropical Indian ocean during El Nino and Indian Ocean dipole years
    Tokinaga, H
    Tanimoto, Y
    [J]. JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN, 2004, 82 (04) : 1007 - 1018
  • [39] Influence of the extreme Indian Ocean dipole 2019 on the equatorial Indian Ocean circulation
    Srinivas, G.
    Amol, P.
    Mukherjee, A.
    [J]. CLIMATE DYNAMICS, 2024, 62 (08) : 7111 - 7125
  • [40] Influence of El Nino-Southern Oscillation and the Indian Ocean Dipole on winegrape maturity in Australia
    Jarvis, C.
    Darbyshire, R.
    Eckard, R.
    Goodwin, I.
    Barlow, E.
    [J]. AGRICULTURAL AND FOREST METEOROLOGY, 2018, 248 : 502 - 510