Indian Ocean capacitor effect on Indo-Western pacific climate during the summer following El Niño

Shang Ping Xie, Kaiming Hu, Jan Hafner, Hiroki Tokinaga, Yan Du, Gang Huang, Takeaki Sampe

研究成果: ジャーナルへの寄稿記事

774 引用 (Scopus)

抄録

Significant climate anomalies persist through the summer (June-August) after El Niño dissipates in spring over the equatorial Pacific. They include the tropical Indian Ocean (TIO) sea surface temperature (SST) warming, increased tropical tropospheric temperature, an anomalous anticyclone over the subtropical northwest Pacific, and increased mei-yu-baiu rainfall over East Asia. The cause of these lingering El Niño effects during summer is investigated using observations and an atmospheric general circulation model (GCM). The results herein indicate that the TIO warming acts like a capacitor anchoring atmospheric anomalies over the Indo-western Pacific Oceans. It causes tropospheric temperature to increase by a moistadiabatic adjustment in deep convection, emanating a baroclinic Kelvin wave into the Pacific. In the northwest Pacific, this equatorial Kelvin wave induces northeasterly surface wind anomalies, and the resultant divergence in the subtropics triggers suppressed convection and the anomalous anticyclone. The GCM results support this Kelvin wave-induced Ekman divergence mechanism. In response to a prescribed SST increase over the TIO, the model simulates the Kelvin wave with low pressure on the equator as well as suppressed convection and the anomalous anticyclone over the subtropical northwest Pacific. An additional experiment further indicates that the north Indian Ocean warming is most important for the Kelvin wave and northwest Pacific anticyclone, a result corroborated by observations. These results have important implications for the predictability of Indo-western Pacific summer climate: the spatial distribution and magnitude of the TIO warming, rather than simply whether there is an El Niño in the preceding winter, affect summer climate anomalies over the Indo-western Pacific and East Asia.

元の言語英語
ページ(範囲)730-747
ページ数18
ジャーナルJournal of Climate
22
発行部数3
DOI
出版物ステータス出版済み - 2 1 2009
外部発表Yes

Fingerprint

Kelvin wave
anticyclone
warming
climate
summer
anomaly
convection
sea surface temperature
divergence
equatorial wave
baroclinic wave
atmospheric general circulation model
surface wind
low pressure
general circulation model
sea surface
temperature
effect
Indian Ocean
spatial distribution

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

これを引用

Indian Ocean capacitor effect on Indo-Western pacific climate during the summer following El Niño. / Xie, Shang Ping; Hu, Kaiming; Hafner, Jan; Tokinaga, Hiroki; Du, Yan; Huang, Gang; Sampe, Takeaki.

:: Journal of Climate, 巻 22, 番号 3, 01.02.2009, p. 730-747.

研究成果: ジャーナルへの寄稿記事

Xie, Shang Ping ; Hu, Kaiming ; Hafner, Jan ; Tokinaga, Hiroki ; Du, Yan ; Huang, Gang ; Sampe, Takeaki. / Indian Ocean capacitor effect on Indo-Western pacific climate during the summer following El Niño. :: Journal of Climate. 2009 ; 巻 22, 番号 3. pp. 730-747.
@article{58fac3446ea34d4fb0c7e6b1799f3f9b,
title = "Indian Ocean capacitor effect on Indo-Western pacific climate during the summer following El Ni{\~n}o",
abstract = "Significant climate anomalies persist through the summer (June-August) after El Ni{\~n}o dissipates in spring over the equatorial Pacific. They include the tropical Indian Ocean (TIO) sea surface temperature (SST) warming, increased tropical tropospheric temperature, an anomalous anticyclone over the subtropical northwest Pacific, and increased mei-yu-baiu rainfall over East Asia. The cause of these lingering El Ni{\~n}o effects during summer is investigated using observations and an atmospheric general circulation model (GCM). The results herein indicate that the TIO warming acts like a capacitor anchoring atmospheric anomalies over the Indo-western Pacific Oceans. It causes tropospheric temperature to increase by a moistadiabatic adjustment in deep convection, emanating a baroclinic Kelvin wave into the Pacific. In the northwest Pacific, this equatorial Kelvin wave induces northeasterly surface wind anomalies, and the resultant divergence in the subtropics triggers suppressed convection and the anomalous anticyclone. The GCM results support this Kelvin wave-induced Ekman divergence mechanism. In response to a prescribed SST increase over the TIO, the model simulates the Kelvin wave with low pressure on the equator as well as suppressed convection and the anomalous anticyclone over the subtropical northwest Pacific. An additional experiment further indicates that the north Indian Ocean warming is most important for the Kelvin wave and northwest Pacific anticyclone, a result corroborated by observations. These results have important implications for the predictability of Indo-western Pacific summer climate: the spatial distribution and magnitude of the TIO warming, rather than simply whether there is an El Ni{\~n}o in the preceding winter, affect summer climate anomalies over the Indo-western Pacific and East Asia.",
author = "Xie, {Shang Ping} and Kaiming Hu and Jan Hafner and Hiroki Tokinaga and Yan Du and Gang Huang and Takeaki Sampe",
year = "2009",
month = "2",
day = "1",
doi = "10.1175/2008JCLI2544.1",
language = "English",
volume = "22",
pages = "730--747",
journal = "Journal of Climate",
issn = "0894-8755",
publisher = "American Meteorological Society",
number = "3",

}

TY - JOUR

T1 - Indian Ocean capacitor effect on Indo-Western pacific climate during the summer following El Niño

AU - Xie, Shang Ping

AU - Hu, Kaiming

AU - Hafner, Jan

AU - Tokinaga, Hiroki

AU - Du, Yan

AU - Huang, Gang

AU - Sampe, Takeaki

PY - 2009/2/1

Y1 - 2009/2/1

N2 - Significant climate anomalies persist through the summer (June-August) after El Niño dissipates in spring over the equatorial Pacific. They include the tropical Indian Ocean (TIO) sea surface temperature (SST) warming, increased tropical tropospheric temperature, an anomalous anticyclone over the subtropical northwest Pacific, and increased mei-yu-baiu rainfall over East Asia. The cause of these lingering El Niño effects during summer is investigated using observations and an atmospheric general circulation model (GCM). The results herein indicate that the TIO warming acts like a capacitor anchoring atmospheric anomalies over the Indo-western Pacific Oceans. It causes tropospheric temperature to increase by a moistadiabatic adjustment in deep convection, emanating a baroclinic Kelvin wave into the Pacific. In the northwest Pacific, this equatorial Kelvin wave induces northeasterly surface wind anomalies, and the resultant divergence in the subtropics triggers suppressed convection and the anomalous anticyclone. The GCM results support this Kelvin wave-induced Ekman divergence mechanism. In response to a prescribed SST increase over the TIO, the model simulates the Kelvin wave with low pressure on the equator as well as suppressed convection and the anomalous anticyclone over the subtropical northwest Pacific. An additional experiment further indicates that the north Indian Ocean warming is most important for the Kelvin wave and northwest Pacific anticyclone, a result corroborated by observations. These results have important implications for the predictability of Indo-western Pacific summer climate: the spatial distribution and magnitude of the TIO warming, rather than simply whether there is an El Niño in the preceding winter, affect summer climate anomalies over the Indo-western Pacific and East Asia.

AB - Significant climate anomalies persist through the summer (June-August) after El Niño dissipates in spring over the equatorial Pacific. They include the tropical Indian Ocean (TIO) sea surface temperature (SST) warming, increased tropical tropospheric temperature, an anomalous anticyclone over the subtropical northwest Pacific, and increased mei-yu-baiu rainfall over East Asia. The cause of these lingering El Niño effects during summer is investigated using observations and an atmospheric general circulation model (GCM). The results herein indicate that the TIO warming acts like a capacitor anchoring atmospheric anomalies over the Indo-western Pacific Oceans. It causes tropospheric temperature to increase by a moistadiabatic adjustment in deep convection, emanating a baroclinic Kelvin wave into the Pacific. In the northwest Pacific, this equatorial Kelvin wave induces northeasterly surface wind anomalies, and the resultant divergence in the subtropics triggers suppressed convection and the anomalous anticyclone. The GCM results support this Kelvin wave-induced Ekman divergence mechanism. In response to a prescribed SST increase over the TIO, the model simulates the Kelvin wave with low pressure on the equator as well as suppressed convection and the anomalous anticyclone over the subtropical northwest Pacific. An additional experiment further indicates that the north Indian Ocean warming is most important for the Kelvin wave and northwest Pacific anticyclone, a result corroborated by observations. These results have important implications for the predictability of Indo-western Pacific summer climate: the spatial distribution and magnitude of the TIO warming, rather than simply whether there is an El Niño in the preceding winter, affect summer climate anomalies over the Indo-western Pacific and East Asia.

UR - http://www.scopus.com/inward/record.url?scp=64049099525&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64049099525&partnerID=8YFLogxK

U2 - 10.1175/2008JCLI2544.1

DO - 10.1175/2008JCLI2544.1

M3 - Article

AN - SCOPUS:64049099525

VL - 22

SP - 730

EP - 747

JO - Journal of Climate

JF - Journal of Climate

SN - 0894-8755

IS - 3

ER -