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Indian Ocean warming as key driver of long-term positive trend of Arctic Oscillation

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Τίτλος: Indian Ocean warming as key driver of long-term positive trend of Arctic Oscillation
Συγγραφείς: Jeong, YC, Yeh, SW, Lim, YK, Santoso, A, Wang, G
Πηγή: urn:ISSN:2397-3722 ; Npj Climate and Atmospheric Science, 5, 1, 56
Στοιχεία εκδότη: Springer Nature
Έτος έκδοσης: 2022
Συλλογή: UNSW Sydney (The University of New South Wales): UNSWorks
Θεματικοί όροι: 37 Earth Sciences, 3708 Oceanography, 3701 Atmospheric Sciences, 3702 Climate Change Science, 13 Climate Action, anzsrc-for: 37 Earth Sciences, anzsrc-for: 3708 Oceanography, anzsrc-for: 3701 Atmospheric Sciences, anzsrc-for: 3702 Climate Change Science
Περιγραφή: Arctic oscillation (AO), which is the most dominant atmospheric variability in the Northern Hemisphere (NH) during the boreal winter, significantly affects the weather and climate at mid-to-high latitudes in the NH. Although a climate community has focused on a negative trend of AO in recent decades, the significant positive trend of AO over the last 60 years has not yet been thoroughly discussed. By analyzing reanalysis and Atmospheric Model Inter-comparison Project (AMIP) datasets with pacemaker experiments, we found that sea surface temperature warming in the Indian Ocean is conducive to the positive trend of AO from the late 1950s. The momentum flux convergence by stationary waves due to the Indian Ocean warming plays an important role in the positive trend of AO, which is characterized by a poleward shift of zonal-mean zonal winds. In addition, the reduced upward propagating wave activity flux over the North Pacific due to Indian Ocean warming also plays a role to strengthen the polar vortex, subsequently, it contributes to the positive trend of AO. Our results imply that the respective warming trend of tropical ocean basins including Indian Ocean, which is either anthropogenic forcing or natural variability or their combined effect, should be considered to correctly project the future AO’s trend.
Τύπος εγγράφου: article in journal/newspaper
Γλώσσα: unknown
Relation: https://hdl.handle.net/1959.4/unsworks_80833
DOI: 10.1038/s41612-022-00279-x
Διαθεσιμότητα: https://hdl.handle.net/1959.4/unsworks_80833
https://doi.org/10.1038/s41612-022-00279-x
Rights: metadata only access ; http://purl.org/coar/access_right/c_14cb ; CC-BY ; https://creativecommons.org/licenses/by/4.0/
Αριθμός Καταχώρησης: edsbas.4ACF771C
Βάση Δεδομένων: BASE
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  Data: Indian Ocean warming as key driver of long-term positive trend of Arctic Oscillation
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  Data: urn:ISSN:2397-3722 ; Npj Climate and Atmospheric Science, 5, 1, 56
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  Data: Springer Nature
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  Data: 2022
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  Data: UNSW Sydney (The University of New South Wales): UNSWorks
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  Data: Arctic oscillation (AO), which is the most dominant atmospheric variability in the Northern Hemisphere (NH) during the boreal winter, significantly affects the weather and climate at mid-to-high latitudes in the NH. Although a climate community has focused on a negative trend of AO in recent decades, the significant positive trend of AO over the last 60 years has not yet been thoroughly discussed. By analyzing reanalysis and Atmospheric Model Inter-comparison Project (AMIP) datasets with pacemaker experiments, we found that sea surface temperature warming in the Indian Ocean is conducive to the positive trend of AO from the late 1950s. The momentum flux convergence by stationary waves due to the Indian Ocean warming plays an important role in the positive trend of AO, which is characterized by a poleward shift of zonal-mean zonal winds. In addition, the reduced upward propagating wave activity flux over the North Pacific due to Indian Ocean warming also plays a role to strengthen the polar vortex, subsequently, it contributes to the positive trend of AO. Our results imply that the respective warming trend of tropical ocean basins including Indian Ocean, which is either anthropogenic forcing or natural variability or their combined effect, should be considered to correctly project the future AO’s trend.
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  Data: https://hdl.handle.net/1959.4/unsworks_80833
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  Data: 10.1038/s41612-022-00279-x
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      – TitleFull: Indian Ocean warming as key driver of long-term positive trend of Arctic Oscillation
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