Influence of retreating Barents–Kara sea ice on the periodicity of El Niño–Southern Oscillation
| Autor: | Eun‐Sook Heo, Soon‐Il An, Ida Margrethe Ringgaard, Shuting Yang, Jens Hesselbjerg Christensen, Mi‐Kyung Sung |
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| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
teleconnection 010504 meteorology & atmospheric sciences CIRCULATION 010502 geochemistry & geophysics 01 natural sciences ARCTIC AMPLIFICATION CLIMATE MODEL Barents-Kara sea ice VARIABILITY WINTERS ENSO periodicity ATMOSPHERIC RESPONSE ENSO 0105 earth and related environmental sciences |
| Zdroj: | Heo, E-S, An, S-I, Ringgaard, I M, Yang, S, Christensen, J H & Sung, M-K 2021, ' Influence of retreating Barents-Kara sea ice on the periodicity of El Nino-Southern Oscillation ', International Journal of Climatology, vol. 42, no. 9, pp. 4881-4892 . https://doi.org/10.1002/joc.7509 |
| ISSN: | 1097-0088 0899-8418 |
| DOI: | 10.1002/joc.7509 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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