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

Abid, Muhammad Adnan; Ashfaq, Moetasim; Kucharski, Fred; Evans, Katherine J.; Almazroui, Mansour

doi:10.1029/2020gl089308

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

Journal Article · 14 September 2020 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2020gl089308 · OSTI ID:1664622

^[1];

^[2]; Kucharski, Fred ^[1];

^[2]; Almazroui, Mansour ^[3]

The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste (Italy); King Abdulaziz Univ., Jeddah (Saudi Arabia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
King Abdulaziz Univ., Jeddah (Saudi Arabia)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; US Air Force

Grant/Contract Number:: AC05-00OR22725; DE‐AC05‐00OR22725

OSTI ID:: 1664622

Alternate ID(s):: OSTI ID: 1665993; OSTI ID: 1786848

Journal Information:: Geophysical Research Letters, Vol. 47, Issue 18; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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