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Understanding the Association of Tropical SST Anomalies on the ISMR During Extreme IOD Events

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10474322" target="_blank" >RIV/00216208:11320/23:10474322 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=884DmCenhr" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=884DmCenhr</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/s00024-023-03394-9" target="_blank" >10.1007/s00024-023-03394-9</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Understanding the Association of Tropical SST Anomalies on the ISMR During Extreme IOD Events

  • Original language description

    The synergistic effects of the Indian Ocean Dipole (IOD) and El Nino Southern Oscillation (ENSO) have been investigated in this study over various subregions of India during 1981-2015. The IOD, is aperiodic and erratic, still this phenomenon is intrinsic in nature dependent on coupled ocean and atmospheric characteristics of the Indian ocean. About 60% of the IOD events showed its coexistence with ENSO during the 35-year recent climatology, still 40% of IOD events are independently occurring. For this analysis, the strongest three positive IOD (1994, 1997, 2006) and three negative IOD (1996, 1998, 2010) events have been identified that co-occurred with El-Nino and La-Nina events respectively. This study reveals that pIOD events are stronger and but the nIOD events are frequent and effecting Indian Summer Monsoon Rainfall (ISMR). The Sea Surface Temperature (SST) anomalies helps in explaining how strong pIOD favors moisture transport towards the western ghats, central India, northwest India, and anticyclonic conditions in the Bay of Bengal area whereas nIOD produces less rainfall in central India and the western ghats, but greater rainfall in the northeastern region. The reduced ENSO-IOD coupling in the 2000s may have strengthened the connection between ENSO and the Indian Summer Monsoon (ISMR), which had experienced a weakening in preceding decades, as reported by Kumar et al. (Science 284:2156-2159, 1999) and Ashok et al. (Geophys Res Lett 28:4499-4502, 2001). This study also investigates whether a regional climate model (RegCM4.7) accurately incorporate the realistic ENSO-IOD coupling mechanisms, and simulate its impact on regionalized precipitation during summer monsoon. The high-resolution RegCM4.7 simulations are close to the observation of rainfall during 2006, 1996 and 2010 extreme IOD events simulation that indicate RCM&apos;s higher sensitivity towards the abrupt change in boundary condition such as SST. Overall, the monsoon core regions i.e., central India, western ghats and northeast India, both IOD and southern oscillations are the synergistic predictor for the ISMR.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10509 - Meteorology and atmospheric sciences

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2023

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Pure and Applied Geophysics

  • ISSN

    0033-4553

  • e-ISSN

    1420-9136

  • Volume of the periodical

    2023

  • Issue of the periodical within the volume

    2023

  • Country of publishing house

    CH - SWITZERLAND

  • Number of pages

    17

  • Pages from-to

    1-17

  • UT code for WoS article

    001129255900001

  • EID of the result in the Scopus database