Tropical Indian Ocean Mediates ENSO Influence Over Central Southwest Asia During the Wet Season
Abstract
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:
-
[1];
[2];
[2];
- 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
- Computational Sciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN USA
- Centre of Excellence for Climate Change Research (CECCR)/Department of Meteorology King Abdulaziz University Jeddah Saudi Arabia
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; US Air Force
- OSTI Identifier:
- 1664622
- Alternate Identifier(s):
- OSTI ID: 1665993; OSTI ID: 1786848
- Grant/Contract Number:
- AC05-00OR22725; DE‐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
- Subject:
- 54 ENVIRONMENTAL SCIENCES
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. https://doi.org/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. https://doi.org/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 = {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.},
doi = {10.1029/2020GL089308},
journal = {Geophysical Research Letters},
number = 18,
volume = 47,
place = {United States},
year = {2020},
month = {9}
}
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Cited by: 19 works
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Figures / Tables:
Figure 1: (a–f) Regression of the monthly global precipitation anomalies onto the standardized CSWA precipitation index [45–80°E; 22–40°N] during the wet season (1981–2018; mm/day); (g–l) same as in (a)–(f) but for the 200‐hPa geopotential height (Z200) anomalies (m); (m–r) same as in (a)–(f) but for the velocity potential (CHI200) anomaliesmore »
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