Influence of retreating Barents-Kara sea ice on the periodicity of El Nino-Southern Oscillation
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Influence of retreating Barents-Kara sea ice on the periodicity of El Nino-Southern Oscillation. / Heo, Eun-Sook; An, Soon-Il; Ringgaard, Ida Margrethe; Yang, Shuting; Christensen, Jens Hesselbjerg; Sung, Mi-Kyung.
I: International Journal of Climatology, Bind 42, Nr. 9, 20.12.2021, s. 4881-4892.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Influence of retreating Barents-Kara sea ice on the periodicity of El Nino-Southern Oscillation
AU - Heo, Eun-Sook
AU - An, Soon-Il
AU - Ringgaard, Ida Margrethe
AU - Yang, Shuting
AU - Christensen, Jens Hesselbjerg
AU - Sung, Mi-Kyung
PY - 2021/12/20
Y1 - 2021/12/20
N2 - The abrupt decline in sea ice in the Barents-Kara (BK) Sea because of global warming has been argued to influence not only higher latitudes but also the tropics. Using EC-Earth model simulations, we demonstrated that the El Nino-Southern Oscillation (ENSO) period becomes longer when BK sea ice substantially decreases. As BK sea ice was forcibly reduced through nudging experiments, the mean Walker circulation shifted to the west, and the zonal sea surface temperature contrast in the tropical Pacific was enhanced. Consequently, the western Pacific mean thermocline became deeper, which reduced the sensitivity of oceanic wave response to wind forcing. Therefore, the oceanic Kelvin waves reflected by ENSO-induced surface winds, a primary delayed negative feedback factor, were significantly weakened. Thus, ENSO phases could be sustained for longer.
AB - The abrupt decline in sea ice in the Barents-Kara (BK) Sea because of global warming has been argued to influence not only higher latitudes but also the tropics. Using EC-Earth model simulations, we demonstrated that the El Nino-Southern Oscillation (ENSO) period becomes longer when BK sea ice substantially decreases. As BK sea ice was forcibly reduced through nudging experiments, the mean Walker circulation shifted to the west, and the zonal sea surface temperature contrast in the tropical Pacific was enhanced. Consequently, the western Pacific mean thermocline became deeper, which reduced the sensitivity of oceanic wave response to wind forcing. Therefore, the oceanic Kelvin waves reflected by ENSO-induced surface winds, a primary delayed negative feedback factor, were significantly weakened. Thus, ENSO phases could be sustained for longer.
KW - Barents-Kara sea ice
KW - ENSO periodicity
KW - teleconnection
KW - ATMOSPHERIC RESPONSE
KW - ARCTIC AMPLIFICATION
KW - CLIMATE
KW - VARIABILITY
KW - CIRCULATION
KW - MODEL
KW - ENSO
KW - WINTERS
U2 - 10.1002/joc.7509
DO - 10.1002/joc.7509
M3 - Journal article
VL - 42
SP - 4881
EP - 4892
JO - International Journal of Climatology
JF - International Journal of Climatology
SN - 0899-8418
IS - 9
ER -
ID: 288715171