Large-scale air-sea interactions in the tropical western Pacific on interannual and intraseasonal time scales

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Abstract

(1) The interannual variability of the main thermocline in the tropical western Pacific along the 137°E longitude line is reflected primarily in the quasi-biennial oscillation (QBO) time scale. Each dominant eastward-propagating QBO mode is extracted by applying a complex EOF analysis to the sea surface temperature (SST) and 700 mb zonal wind anomaly fields over the tropical Indian and Pacific Oceans. (2) Two air-sea coupled modes; ie intraseasonal and interannual modes, are statistically extracted using the complex EOF analysis. There exist remarkable differences in the air-sea coupling of the intraseasonal time scale compared with the interannual time scale. (3) The growth of the atmospheric 30-60 day oscillation over the equatorial western Pacific is even affected by high SST above a threshold value of 28°-28.5°C. The intraseasonal variations, especially with 40-60 day scales are predominant when the mean SST over the warm water region is in the range of 29°-29.5°C. There exists strong air-sea coupling on the intraseasonal time scale in the warm water region. -from Author

Original languageEnglish
JournalEnvironmental Research Centre Papers - University of Tsukuba
Volume14
Publication statusPublished - Jan 1 1990
Externally publishedYes

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air-sea interaction
atmosphere-ocean coupling
timescale
quasi-biennial oscillation
sea surface temperature
warm water
zonal wind
thermocline
oscillation
anomaly
air
ocean
empirical orthogonal function analysis

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

@article{a2179f6bbbfa4743ae4ed544df2a457c,
title = "Large-scale air-sea interactions in the tropical western Pacific on interannual and intraseasonal time scales",
abstract = "(1) The interannual variability of the main thermocline in the tropical western Pacific along the 137°E longitude line is reflected primarily in the quasi-biennial oscillation (QBO) time scale. Each dominant eastward-propagating QBO mode is extracted by applying a complex EOF analysis to the sea surface temperature (SST) and 700 mb zonal wind anomaly fields over the tropical Indian and Pacific Oceans. (2) Two air-sea coupled modes; ie intraseasonal and interannual modes, are statistically extracted using the complex EOF analysis. There exist remarkable differences in the air-sea coupling of the intraseasonal time scale compared with the interannual time scale. (3) The growth of the atmospheric 30-60 day oscillation over the equatorial western Pacific is even affected by high SST above a threshold value of 28°-28.5°C. The intraseasonal variations, especially with 40-60 day scales are predominant when the mean SST over the warm water region is in the range of 29°-29.5°C. There exists strong air-sea coupling on the intraseasonal time scale in the warm water region. -from Author",
author = "Ryuichi Kawamura",
year = "1990",
month = "1",
day = "1",
language = "English",
volume = "14",
journal = "Environmental Research Centre Papers - University of Tsukuba",

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TY - JOUR

T1 - Large-scale air-sea interactions in the tropical western Pacific on interannual and intraseasonal time scales

AU - Kawamura, Ryuichi

PY - 1990/1/1

Y1 - 1990/1/1

N2 - (1) The interannual variability of the main thermocline in the tropical western Pacific along the 137°E longitude line is reflected primarily in the quasi-biennial oscillation (QBO) time scale. Each dominant eastward-propagating QBO mode is extracted by applying a complex EOF analysis to the sea surface temperature (SST) and 700 mb zonal wind anomaly fields over the tropical Indian and Pacific Oceans. (2) Two air-sea coupled modes; ie intraseasonal and interannual modes, are statistically extracted using the complex EOF analysis. There exist remarkable differences in the air-sea coupling of the intraseasonal time scale compared with the interannual time scale. (3) The growth of the atmospheric 30-60 day oscillation over the equatorial western Pacific is even affected by high SST above a threshold value of 28°-28.5°C. The intraseasonal variations, especially with 40-60 day scales are predominant when the mean SST over the warm water region is in the range of 29°-29.5°C. There exists strong air-sea coupling on the intraseasonal time scale in the warm water region. -from Author

AB - (1) The interannual variability of the main thermocline in the tropical western Pacific along the 137°E longitude line is reflected primarily in the quasi-biennial oscillation (QBO) time scale. Each dominant eastward-propagating QBO mode is extracted by applying a complex EOF analysis to the sea surface temperature (SST) and 700 mb zonal wind anomaly fields over the tropical Indian and Pacific Oceans. (2) Two air-sea coupled modes; ie intraseasonal and interannual modes, are statistically extracted using the complex EOF analysis. There exist remarkable differences in the air-sea coupling of the intraseasonal time scale compared with the interannual time scale. (3) The growth of the atmospheric 30-60 day oscillation over the equatorial western Pacific is even affected by high SST above a threshold value of 28°-28.5°C. The intraseasonal variations, especially with 40-60 day scales are predominant when the mean SST over the warm water region is in the range of 29°-29.5°C. There exists strong air-sea coupling on the intraseasonal time scale in the warm water region. -from Author

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VL - 14

JO - Environmental Research Centre Papers - University of Tsukuba

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