TY - JOUR
T1 - Impact of winter ural blocking on Arctic sea ice
T2 - Short-time variability
AU - Chen, Xiaodan
AU - Luo, Dehai
AU - Feldstein, Steven B.
AU - Lee, Sukyoung
N1 - Funding Information:
Acknowledgments. The authors acknowledge the support from the Chinese Academy of Sciences Strategic Priority Research Program (Grant XDA19070403), the National Natural Science Foundation of China (41790473, 41430533), and U.S. National Science Foundation Grants AGS-1455577, AGS-1401220, and OPP-1723832. This paper was written as the second author was a visiting scientist at the Department of Meteorology and Atmospheric Science, The Pennsylvania State University, during his stay from September to October 2016. The authors would like to thank three anonymous reviewers for their useful suggestions, which helped improve the quality of this paper.
Publisher Copyright:
© 2018 American Meteorological Society.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - Using daily reanalysis data from 1979 to 2015, this paper examines the impact of winter Ural blocking (UB) on winter Arctic sea ice concentration (SIC) change over the Barents and Kara Seas (BKS). A case study of the sea ice variability in the BKS in the 2015/16 and 2016/17 winters is first presented to establish a link between the BKS sea ice variability and UB events. Then the UB events are classified into quasi-stationary (QUB), westward-shifting (WUB), and eastward-shifting (EUB) UB types. It is found that the frequency of the QUB events increases significantly during 1999-2015, whereas the WUB events show a decreasing frequency trend during 1979-2015. Moreover, it is shown that the variation of the BKS-SIC is related to downward infrared radiation (IR) and surface sensible and latent heat flux changes due to different zonal movements of the UB. Calculations show that the downward IR is the main driver of the BKS-SIC decline for QUB events, while the downward IR and surface sensible heat flux make comparable contributions to the BKS-SIC variation for WUB and EUB events. The SIC decline peak lags the QUB and EUB peaks by about 3 days, though QUB and EUB require lesser prior SIC. The QUB gives rise to the largest SIC decline likely because of its longer persistence, whereas the BKS-SIC decline is relatively weak for the EUB. The WUB is found to cause a SIC decline during its growth phase and an increase during its decay phase. Thus, the zonal movement of the UB has an important impact on the SIC variability in BKS.
AB - Using daily reanalysis data from 1979 to 2015, this paper examines the impact of winter Ural blocking (UB) on winter Arctic sea ice concentration (SIC) change over the Barents and Kara Seas (BKS). A case study of the sea ice variability in the BKS in the 2015/16 and 2016/17 winters is first presented to establish a link between the BKS sea ice variability and UB events. Then the UB events are classified into quasi-stationary (QUB), westward-shifting (WUB), and eastward-shifting (EUB) UB types. It is found that the frequency of the QUB events increases significantly during 1999-2015, whereas the WUB events show a decreasing frequency trend during 1979-2015. Moreover, it is shown that the variation of the BKS-SIC is related to downward infrared radiation (IR) and surface sensible and latent heat flux changes due to different zonal movements of the UB. Calculations show that the downward IR is the main driver of the BKS-SIC decline for QUB events, while the downward IR and surface sensible heat flux make comparable contributions to the BKS-SIC variation for WUB and EUB events. The SIC decline peak lags the QUB and EUB peaks by about 3 days, though QUB and EUB require lesser prior SIC. The QUB gives rise to the largest SIC decline likely because of its longer persistence, whereas the BKS-SIC decline is relatively weak for the EUB. The WUB is found to cause a SIC decline during its growth phase and an increase during its decay phase. Thus, the zonal movement of the UB has an important impact on the SIC variability in BKS.
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U2 - 10.1175/JCLI-D-17-0194.1
DO - 10.1175/JCLI-D-17-0194.1
M3 - Article
AN - SCOPUS:85043715018
SN - 0894-8755
VL - 31
SP - 2267
EP - 2282
JO - Journal of Climate
JF - Journal of Climate
IS - 6
ER -