TY - JOUR
T1 - Weak Stratospheric Polar Vortex Events Modulated by the Arctic Sea-Ice Loss
AU - Hoshi, Kazuhira
AU - Ukita, Jinro
AU - Honda, Meiji
AU - Nakamura, Tetsu
AU - Yamazaki, Koji
AU - Miyoshi, Yasunobu
AU - Jaiser, Ralf
N1 - Funding Information:
We thank K. Nishii and P. J. Kushner for valuable discussions and comments. The JRA‐55 data set was provided by the Japan Meteorological Agency (http://jra.kishou.go.jp/JRA‐55/). The HadISST2 data were downloaded from the Met Office Hadley Centre website (http://www.metoffice.gov.uk/hadobs/ hadisst2/), and Nino 3.4 data were from the NOAA‐CPC webpage (http://origin. cpc.ncep.noaa.gov/products/analysis_ monitoring/ensostuff/ONI_v5.php). This study was in part supported by the Arctic Challenge for Sustainability (ArCS) Project, the Belmont Forum InterDec Project, the Climate Initiative REKLIM, and QUARCCS by the Bundesministerium für Bildung und Forschung under grant agreement 03F0777A. The authors acknowledge comments from anonymous reviewers that improved the manuscript.
Funding Information:
We thank K. Nishii and P. J. Kushner for valuable discussions and comments. The JRA-55 data set was provided by the Japan Meteorological Agency (http://jra.kishou.go.jp/JRA-55/). The HadISST2 data were downloaded from the Met Office Hadley Centre website (http://www.metoffice.gov.uk/hadobs/hadisst2/), and Nino 3.4 data were from the NOAA-CPC webpage (http://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php). This study was in part supported by the Arctic Challenge for Sustainability (ArCS) Project, the Belmont Forum InterDec Project, the Climate Initiative REKLIM, and QUARCCS by the Bundesministerium für Bildung und Forschung under grant agreement 03F0777A. The authors acknowledge comments from anonymous reviewers that improved the manuscript.
Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.
PY - 2019/1/27
Y1 - 2019/1/27
N2 - We characterize the differences in the upward planetary-scale wave propagation during observed weak polar vortex (WPV) events between heavy- and light-sea-ice years in the Barents-Kara Sea based on a composite analysis for the period of 1979–2015. Upward wave propagation during WPV events in heavy-ice years is dominated by the wavenumber 1 component. In contrast, WPV events occurring in light-ice years are characterized by stronger wavenumber 2 propagation, which is caused by the tropospheric wavenumber 2 response to sea-ice reduction in the Barents-Kara Sea. The above observed features are supported by an Atmospheric General Circulation Model experiment. Thus, under present climate conditions, Arctic sea-ice loss is a possible factor modulating the wave propagation during the WPV events. We also find that the WPV events in light-ice years have stronger stratosphere-troposphere coupling, followed by colder midlatitude surface conditions particularly over Eurasia.
AB - We characterize the differences in the upward planetary-scale wave propagation during observed weak polar vortex (WPV) events between heavy- and light-sea-ice years in the Barents-Kara Sea based on a composite analysis for the period of 1979–2015. Upward wave propagation during WPV events in heavy-ice years is dominated by the wavenumber 1 component. In contrast, WPV events occurring in light-ice years are characterized by stronger wavenumber 2 propagation, which is caused by the tropospheric wavenumber 2 response to sea-ice reduction in the Barents-Kara Sea. The above observed features are supported by an Atmospheric General Circulation Model experiment. Thus, under present climate conditions, Arctic sea-ice loss is a possible factor modulating the wave propagation during the WPV events. We also find that the WPV events in light-ice years have stronger stratosphere-troposphere coupling, followed by colder midlatitude surface conditions particularly over Eurasia.
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U2 - 10.1029/2018JD029222
DO - 10.1029/2018JD029222
M3 - Article
AN - SCOPUS:85060760349
SN - 2169-897X
VL - 124
SP - 858
EP - 869
JO - Journal of Geophysical Research: Atmospheres
JF - Journal of Geophysical Research: Atmospheres
IS - 2
ER -
