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Title: Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season

Abstract

El Niño–Southern Oscillation (ENSO) modulates wet season (November–April) precipitation over Central Southwest Asia (CSWA), however, intraseasonal characteristics of its influence are largely unknown, which can be important for its subseasonal to seasonal hydroclimate predictability. Here we show that the ENSO-CSWA teleconnection varies intraseasonally and is a combination of direct and indirect positive influences. The direct influence is through a Rossby wave-like pattern in the tail months. The indirect influence is through an atmospheric dipole of diabatic heating anomalies in the tropical Indian Ocean (TIO) as a result of ENSO-forced response, which also generates a Rossby wave-like forcing and persists throughout the wet season. ENSO exerts its strongest influence when both direct and indirect modes are in phase, while the relationship breaks down when the two modes are out of phase. The atmospheric teleconnection through the atmospheric diabatic heating anomalies in the TIO is reproducible in numerical simulations.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [2];  [3]
  1. Earth System Physics The Abdus Salam International Centre for Theoretical Physics (ICTP) Trieste Italy, Centre of Excellence for Climate Change Research (CECCR)/Department of Meteorology King Abdulaziz University Jeddah Saudi Arabia
  2. Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN USA
  3. Centre of Excellence for Climate Change Research (CECCR)/Department of Meteorology King Abdulaziz University Jeddah Saudi Arabia
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; US Air Force
OSTI Identifier:
1664622
Alternate Identifier(s):
OSTI ID: 1665993
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Name: Geophysical Research Letters Journal Volume: 47 Journal Issue: 18; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English

Citation Formats

Abid, Muhammad Adnan, Ashfaq, Moetasim, Kucharski, Fred, Evans, Katherine J., and Almazroui, Mansour. Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season. United States: N. p., 2020. Web. doi:10.1029/2020GL089308.
Abid, Muhammad Adnan, Ashfaq, Moetasim, Kucharski, Fred, Evans, Katherine J., & Almazroui, Mansour. Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season. United States. doi:10.1029/2020GL089308.
Abid, Muhammad Adnan, Ashfaq, Moetasim, Kucharski, Fred, Evans, Katherine J., and Almazroui, Mansour. Mon . "Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season". United States. doi:10.1029/2020GL089308.
@article{osti_1664622,
title = {Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season},
author = {Abid, Muhammad Adnan and Ashfaq, Moetasim and Kucharski, Fred and Evans, Katherine J. and Almazroui, Mansour},
abstractNote = {El Niño–Southern Oscillation (ENSO) modulates wet season (November–April) precipitation over Central Southwest Asia (CSWA), however, intraseasonal characteristics of its influence are largely unknown, which can be important for its subseasonal to seasonal hydroclimate predictability. Here we show that the ENSO-CSWA teleconnection varies intraseasonally and is a combination of direct and indirect positive influences. The direct influence is through a Rossby wave-like pattern in the tail months. The indirect influence is through an atmospheric dipole of diabatic heating anomalies in the tropical Indian Ocean (TIO) as a result of ENSO-forced response, which also generates a Rossby wave-like forcing and persists throughout the wet season. ENSO exerts its strongest influence when both direct and indirect modes are in phase, while the relationship breaks down when the two modes are out of phase. The atmospheric teleconnection through the atmospheric diabatic heating anomalies in the TIO is reproducible in numerical simulations.},
doi = {10.1029/2020GL089308},
journal = {Geophysical Research Letters},
number = 18,
volume = 47,
place = {United States},
year = {2020},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1029/2020GL089308

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