Weakness of the Air-Sea Thermal Coupling during Indian Ocean Dipole Mode in the 1990s

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Other Title
  • 1990年代のインド洋ダイポールモードにおける大気海洋間相互作用の果たす役割の弱さについて

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Abstract

We analyze the temporal and spatial variation of the thermal structure of the eastern tropical Indian Ocean associated with Indian Ocean Dipole Mode (IOD), mainly using the water temperature of 10 years (1990-1999) of the World Ocean Circulation Experiment (WOCE) repeat IX1 expendable bathythermograph (XBT) section between Java and Western Australia together with the product of the air-sea coupled four-dimensional variational analysis (4D-VAR) system. The temperature anomaly of the XBT section reveals that the subsurface ocean temperature changes earlier than the surface before the surface IOD pattern starts to grow up. From May to August, a marked subsurface temperature anomaly is also found as well as the sea surface temperature (SST) that is formed primarily by the anomalous coastal upwelling along the south Java coast. Heat budget analysis along IX1 shows that the surface heat flux does not work to enhance the mixed layer temperature anomaly in the eastern pole region.

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Details 詳細情報について

  • CRID
    1050282810670493696
  • NII Article ID
    120002515025
  • NII Book ID
    AN00027784
  • ISSN
    0386412X
  • HANDLE
    2433/129275
  • Text Lang
    en
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB
    • CiNii Articles

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