Diverse impacts of Indian Ocean Dipole on El Niño-Southern Oscillation

Details

• Journal Title:
  Journal of Climate
• Personal Author:
  Zhang, Lei ; Han, Weiqing ; Meehl, Gerald A. ; Hu, Aixue ; Rosenbloom, Nan ; Shinoda, Toshiaki ; McPhaden, Michael J.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)
• Description:
  Understanding the impact of the Indian Ocean Dipole (IOD) on El Niño-Southern Oscillation (ENSO) is important for climate prediction. By analyzing observational data and performing Indian and Pacific Ocean pacemaker experiments using a state-of-the-art climate model, we find that a positive IOD (pIOD) can favor both cold and warm sea surface temperature anomalies (SSTA) in the tropical Pacific, in contrast to the previously identified pIOD-El Niño connection. The diverse impacts of the pIOD on ENSO are related to SSTA in the Seychelles-Chagos thermocline ridge (SCTR; 60°E-85°E and 7°S-15°S) as part of the warm pole of the pIOD. Specifically, a pIOD with SCTR warming can cause warm SSTA in the southeast Indian Ocean, which induces La Niña-like conditions in the tropical Pacific through interbasin interaction processes associated with a recently identified climate phenomenon dubbed the “Warm Pool Dipole”. This study identifies a new pIOD-ENSO relationship and examines the associated mechanisms.
• Source:
  Journal of Climate (2021)
• DOI:
  https://doi.org/10.1175/JCLI-D-21-0085.1
• ISSN:
  0894-8755 ; 1520-0442
• Format:
  PDF
• Publisher:
  American Meteorological Society
• Document Type:
  Journal Article
• Rights Information:
  Other
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha-512:16463f6669cbefdfdb5dc6f450bb888411ca91316b57c42b846d4a1f1fe8837e8b101d086e36a53b34b2271033f30d763bfc15441ef475daca2bbefa67b931d1
• Download URL:
  https://repository.library.noaa.gov/view/noaa/61748/noaa_61748_DS1.pdf
• File Type:
  [PDF - 3.87 MB ]