DOI: 10.5194/tc-15-169-2021
论文题名: Ensemble-based estimation of sea-ice volume variations in the Baffin Bay
作者: Min C. ; Yang Q. ; Mu L. ; Kauker F. ; Ricker R.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 169
结束页码: 181
语种: 英语
英文关键词: deep water formation
; ensemble forecasting
; estimation method
; inflow
; satellite data
; sea ice
; Arctic
; Arctic Ocean
; Atlantic Ocean
; Baffin Bay [Arctic Ocean]
; Canada
; Canadian Arctic
; Davis Strait
; Labrador Sea
英文摘要: Sea ice in the Baffin Bay plays an important role in deep water formation in the Labrador Sea and contributes to the variation of the Atlantic meridional overturning circulation (AMOC) on larger scales. Sea-ice data from locally merged satellite observations (Sat-merged SIT) in the eastern Canadian Arctic and three state-of-the-art sea ice- ocean models are used to quantify sea-ice volume variations from 2011 to 2016. Ensemble-based sea-ice volume (SIV) fluxes and the related standard deviations in the Baffin Bay are generated from four different estimates of SIV fluxes that were derived from Sat-merged SIT, three modeled SITs and satellite-based ice-drift data. Results show that the net increase in the SIV in Baffin Bay occurs from October to early April with the largest SIV increase in December (113±17 km3month-1) followed by a reduction from May to September with the largest SIV decline in July (-160±32 km3month-1). The maximum SIV inflow occurs in winter with the amount of 236 (±38) km3 while ice outflow reaches the maximum in spring with a mean value of 168 (±46) km3. The ensemble mean SIV inflow reaches its maximum (294±59 km3) in winter 2013 caused by high ice velocity along the north gate while the largest SIV outflow (229±67 km3) occurs in spring of 2014 due to the high ice velocity and thick ice along the south gate. The long-term annual mean ice volume inflow and outflow are 411 (±74) km3yr-1and 312 (±80) km3yr-1, respectively. Our analysis also reveals that, on average, sea ice in the Baffin Bay melts from May to September with a net reduction of 335 km3in volume while it freezes from October to April with a net increase of 218 km3. In the melting season, there is about 268 km3freshwater produced by local melting of sea ice in the Baffin Bay. In the annual mean, the mean freshwater converted from SIV outflow that enters the Labrador Sea is about 250 km3yr-1(i.e., 8 mSv), while it is only about 9% of the net liquid freshwater flux through the Davis Strait. The maximum freshwater flux derived from SIV outflow peaks in March is 65 km3(i.e., 25 mSv). © 2021 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164763
Appears in Collections: 气候变化与战略
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作者单位: School of Atmospheric Sciences, Sun Yat-sen University, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, China; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany; Ocean Atmosphere Systems, Hamburg, 20249, Germany
Recommended Citation:
Min C.,Yang Q.,Mu L.,et al. Ensemble-based estimation of sea-ice volume variations in the Baffin Bay[J]. Cryosphere,2021-01-01,15(1)