In this section
@article{Frankignoul:2025:10.1175/JCLI-D-25-0083.1,
author = {Frankignoul, C and Hall, R and Kwon, YO and Czaja, A},
doi = {10.1175/JCLI-D-25-0083.1},
journal = {Journal of Climate},
pages = {5055--5066},
title = {On the Atmospheric Response to Oyashio Extension Front Disturbance and Mesoscale SST Variations},
url = {http://dx.doi.org/10.1175/JCLI-D-25-0083.1},
volume = {38},
year = {2025}
}
TY - JOUR
AB - Using a regional atmospheric model at 27-km resolution over the western North Pacific, we explore the sensitivity of the atmospheric response to sea surface temperature (SST) anomalies associated with meridional shifts of the Oyashio Extension (OE) front. Twenty different SST conditions are prescribed by adding SST anomalies in different years of 1979–2016 to a base SST state taken on a February 2013 day with a relatively neutral SST distribution. The model is integrated for a single storm duration and the entire February 2013, using identical initial and lateral boundary conditions. The differences between the responses to the 10 highest and lowest SST anomalies are highly significant and baroclinic. Simulations with the extreme positive and negative SST anomalies and their decomposition into spatial mean and residuals indicate that the large-scale and storm-track responses are determined by the spatial mean SST anomalies and are insensitive to the residual mesoscale SSTs. This holds at 10-km atmospheric resolution, where the responses remain similar and are dominated by the impact of the spatial mean SST anomalies, except for slight differences in the storm-track response and stronger vertical motions. We also investigate the influence of the central region (1558–1648E) of the OE that often has parallel or indistinct frontal zones in part linked to mesoscale eddy activity, as described by a frontal disturbance index (FDI). Differences between the response to the 10 highest and lowest FDI cases are small and lack statistical significance. Mesoscale SST variations thus had very little impact on the large-scale atmospheric response.
AU - Frankignoul,C
AU - Hall,R
AU - Kwon,YO
AU - Czaja,A
DO - 10.1175/JCLI-D-25-0083.1
EP - 5066
PY - 2025///
SN - 0894-8755
SP - 5055
TI - On the Atmospheric Response to Oyashio Extension Front Disturbance and Mesoscale SST Variations
T2 - Journal of Climate
UR - http://dx.doi.org/10.1175/JCLI-D-25-0083.1
VL - 38
ER -