NDLI: Initial Transient Response of the Winter Polar Stratospheric Vortex to Idealized Equatorial Pacific Sea Surface Temperature Anomalies in the NCAR WACCM

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Initial Transient Response of the Winter Polar Stratospheric Vortex to Idealized Equatorial Pacific Sea Surface Temperature Anomalies in the NCAR WACCM

Content Provider	Semantic Scholar
Author	Hegyi, Bradley M. Deng, Yi Black, Robert X. Zhou, Renjun
Copyright Year	2014
Abstract	AbstractPerpetual winter simulations using the NCAR Whole Atmosphere Community Climate Model (WACCM) are conducted to document the differences of the initial transient response of the boreal winter Northern Hemisphere stratospheric polar vortex to central (CPW) and eastern Pacific warming (EPW) events. Idealized patches of positive sea surface temperature (SST) anomalies are superimposed onto a climatological SST field to mimic canonical CPW and EPW forcings. A 20-member ensemble was created by varying initial atmospheric conditions for both CPW and EPW cases. In the ensemble average, the vortex weakens under both CPW and EPW forcing, indicated by a negative zonal mean zonal wind tendency. This tendency is mainly tied to changes in the eddy-driven mean meridional circulation (MMC). A negative anomaly in the eddy momentum flux convergence also plays a secondary role in the weakening. The vortex response, however, differs dramatically among individual ensemble members. A few ensemble members exhibit initial...
Starting Page	2699
Ending Page	2713
Page Count	15
File Format	PDF HTM / HTML
DOI	10.1175/JCLI-D-13-00289.1
Volume Number	27
Alternate Webpage(s)	http://deng.eas.gatech.edu/sites/default/files/files/Hegyi_Deng_JClimate_2014.pdf
Alternate Webpage(s)	https://doi.org/10.1175/JCLI-D-13-00289.1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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