Role of Mixed Layer Depth in Kuroshio Extension Decadal Variability

Tozuka, Tomoki; Toyoda, Takahiro; Cronin, Meghan F.

doi:10.1029/2022gl101846

Geophysical Research Letters

2023

DOI: 10.1029/2022gl101846

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Role of Mixed Layer Depth in Kuroshio Extension Decadal Variability

Tomoki Tozuka

Takahiro Toyoda

Meghan F. Cronin

Abstract: suggested that these SST anomalies play a crucial role in turnabouts of decadal variations, it is important to understand the physical mechanisms controlling these SST anomalies. It has been shown that anticyclonic anomalies associated with a poleward shift and/or weakening of the Aleutian Low excite downwelling Rossby waves (

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The role of upper-ocean variations of the Kuroshio-Oyashio Extension in seasonal-to-decadal air-sea heat flux variability

Joh,

Delworth,

Wittenberg

et al. 2023

npj Clim Atmos Sci

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The Kuroshio-Oyashio Extension (KOE) is the North Pacific oceanic frontal zone where air-sea heat and moisture exchanges allow strong communication between the ocean and atmosphere. Using satellite observations and reanalysis datasets, we show that the KOE surface heat flux variations are very closely linked to Kuroshio Extension (KE) sea surface height (SSH) variability on both seasonal and decadal time scales. We investigate seasonal oceanic and atmospheric anomalies associated with anomalous KE upper ocean temperature, as reflected in SSH anomalies (SSHa). We show that the ocean-induced seasonal changes in air-sea coupled processes, which are accompanied by KE upper-ocean temperature anomalies, lead to significant ocean-to-atmosphere heat transfer during November-December-January (i.e., NDJ). This anomalous NDJ KOE upward heat transfer has recently grown stronger in the observational record, which also appears to be associated with the enhanced KE decadal variability. Highlighting the role of KOE heat fluxes as a communicator between the upper-ocean and the overlying atmosphere, our findings suggest that NDJ KOE heat flux variations could be a useful North Pacific climate indicator.

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The role of upper-ocean variations of the Kuroshio-Oyashio Extension in seasonal-to-decadal air-sea heat flux variability

Joh,

Delworth,

Wittenberg

et al. 2023

npj Clim Atmos Sci

View full text Add to dashboard Cite

show abstract

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Role of Mixed Layer Depth in Kuroshio Extension Decadal Variability

Cited by 1 publication

References 75 publications

The role of upper-ocean variations of the Kuroshio-Oyashio Extension in seasonal-to-decadal air-sea heat flux variability

The role of upper-ocean variations of the Kuroshio-Oyashio Extension in seasonal-to-decadal air-sea heat flux variability

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