Preprints
https://doi.org/10.5194/acp-2022-562
https://doi.org/10.5194/acp-2022-562
 
09 Sep 2022
09 Sep 2022
Status: this preprint is currently under review for the journal ACP.

A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades

Lejiang Yu1, Shiyuan Zhong2, Timo Vihma3, Cuijuan Sui4, and Bo Sun1 Lejiang Yu et al.
  • 1MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China
  • 2Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI, USA
  • 3Finnish Meteorological Institute, Helsinki, Finland
  • 4National Marine Environmental Forecasting Center, Beijing, China

Abstract. We utilized the global atmospheric reanalysis (ERA5) and reconstructed sea surface temperature (SST) data from 1979 through 2020 to examine the stability of the relationship between the SST oscillations in the southern Indian and the Atlantic Oceans described by the Subtropical Indian Ocean Dipole (SIOD) and the South Atlantic Ocean Dipole (SAOD) indices. We note a significant positive correlation between the two indices prior to the year 2000 but practically no correlation afterwards. We show that in the two decades prior to 2000, a positive phase of SAOD is associated with more convective activities over the subtropical southern Atlantic Ocean and eastern Brazil, which trigger a stronger upper-atmosphere wavetrain, and further produces stronger southern subtropical highs and surface anti-cyclonic circulations and therefore a stronger correlation between the two indices. The situation is reversed after 2000. Our results are potentially applicable for predictions of precipitation in southern Africa and South America.

Lejiang Yu et al.

Status: open (until 21 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-562', Anonymous Referee #1, 26 Sep 2022 reply
  • RC2: 'Comment on acp-2022-562', Anonymous Referee #2, 29 Sep 2022 reply

Lejiang Yu et al.

Lejiang Yu et al.

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Short summary
Previous studies have noted a significant relationship between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices, little is known about the stability of their relationship. We found that a significant positive correlation between the two indices prior to the year 2000 but insignificant correlation afterwards.
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