气候变化领域集成服务门户(CCPortal): Influences of summertime arctic dipole atmospheric circulation on sea ice concentration variations in the pacific sector of the arctic during different pacific decadal oscillation phases

CCPortal

DOI	10.1175/JCLI-D-19-0843.1
	Influences of summertime arctic dipole atmospheric circulation on sea ice concentration variations in the pacific sector of the arctic during different pacific decadal oscillation phases
	Bi H.; Wang Y.; Liang Y.; Sun W.; Liang X.; Yu Q.; Zhang Z.; Xu X.
发表日期	2021
ISSN	08948755
起始页码	3003
结束页码	3019
卷号	34 期号:8
英文摘要	Atmospheric circulation associated with the Arctic dipole (AD) pattern plays a crucial role in modulating the variations of summertime sea ice concentration (SIC) within the Pacific Arctic sector (PAS). Based on reanalysis data and satellite observations, we found that the impacts of atmospheric circulation associated with a positive AD (AD1) on SIC change over different regions of the PAS [including the East Siberian Sea (ESS), Beaufort and Chukchi Seas (BCS), and Canadian Arctic Archipelago (CAA)] are dependent on the phase shifts of Pacific decadal oscillation (PDO). Satellite observations reveal that SIC anomalies, influenced by AD1 during PDO2 relative to that during PDO1, varies significantly in summer by 4.9%, 27.3%, and 26.4% over ESS, BCS, and CAA, respectively. Overall, the atmospheric anomalies over CAA and BCS in terms of specific humidity, air temperature, and thereby downward longwave radiation (DLR), are enhanced (weakened) in the atmospheric conditions associated with AD1 during PDO2 (PDO1). In these two regions, the larger (smaller) increases in specific humidity and air temperature, associated with AD1 during PDO2 (PDO1), are connected to the increased (decreased) poleward moisture flux, strengthened (weakened) convergence of moisture and heat flux, and in part to adiabatic heating. As a consequence, the DLR and surface net energy flux anomalies over the two regions are reinforced in the atmospheric scenarios associated with AD1 during PDO2 compared with that during PDO1. Therefore, smaller SIC anomalies are identified over CAA and BCS in the cases related to AD1 during PDO2 than during PDO1. Essentially, the changes of the DLR anomaly in CAA and BCS are in alignment with geopotential height anomalies, which are modulated by the anticyclonic circulation pattern in association with AD1 during varying PDO phases. In contrast, the SIC changes over ESS is primarily attributed to the variations in mechanical wind forcing and sea surface temperature (SST) anomalies. The cloud fraction anomalies associated with AD1 during different PDO phases are found not to be a significant contributor to the variations of sea ice anomaly in the studied regions. Given the oscillatory nature of PDO, we speculate that the recent shift to the PDO1 phase may temporarily slow the observed significant decline trend of the summertime SIC within PAS of the Arctic. © 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Arctic; Atmosphere-ocean interaction; Atmospheric circulation; Satellite observations; Sea ice
语种	英语
scopus关键词	Atmospheric temperature; Climatology; Heat flux; Moisture; Oceanography; Sea ice; Surface waters; Anticyclonic circulation; Atmospheric circulation; Atmospheric conditions; Canadian Arctic Archipelago; Geopotential height anomalies; Pacific decadal oscillation; Satellite observations; Sea surface temperature anomalies; Atmospheric humidity; air-sea interaction; atmospheric circulation; Pacific Decadal Oscillation; satellite imagery; sea ice; sea surface temperature; summer; temperature anomaly; Arctic Ocean; Beaufort Sea; Canada; Canadian Arctic; Chukchi Sea; East Siberian Sea
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178647
作者单位	Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China; Key Laboratory of Research on Marine Hazard Forecasting Center, National Marine Environmental Forecasting Center, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Bi H.,Wang Y.,Liang Y.,et al. Influences of summertime arctic dipole atmospheric circulation on sea ice concentration variations in the pacific sector of the arctic during different pacific decadal oscillation phases[J],2021,34(8).
APA	Bi H..,Wang Y..,Liang Y..,Sun W..,Liang X..,...&Xu X..(2021).Influences of summertime arctic dipole atmospheric circulation on sea ice concentration variations in the pacific sector of the arctic during different pacific decadal oscillation phases.Journal of Climate,34(8).
MLA	Bi H.,et al."Influences of summertime arctic dipole atmospheric circulation on sea ice concentration variations in the pacific sector of the arctic during different pacific decadal oscillation phases".Journal of Climate 34.8(2021).