DOI: 10.5194/tc-15-1307-2021
论文题名: Combined influence of oceanic and atmospheric circulations on Greenland sea ice concentration
作者: Chatterjee S. ; Raj R.P. ; Bertino L. ; Mernild S.H. ; Puthukkottu Subeesh M. ; Murukesh N. ; Ravichandran M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 3 起始页码: 1307
结束页码: 1319
语种: 英语
英文关键词: atmosphere-ocean system
; circulation
; concentration (composition)
; Ekman transport
; gyre
; North Atlantic Deep Water
; Northern Oscillation
; oceanic circulation
; satellite altimetry
; sea ice
; sea level pressure
; stratification
; upper ocean
; vertical mixing
; wind stress
; Arctic
; Arctic Ocean
; Fram Strait
; Greenland Sea
; Norwegian Sea
; Norwegian Sea
英文摘要: The amount and spatial extent of Greenland Sea (GS) ice are primarily controlled by the sea ice export across the Fram Strait (FS) and by local seasonal sea ice formation, melting, and sea ice dynamics. In this study, using satellite passive microwave sea ice observations, atmospheric and a coupled ocean-sea ice reanalysis system, TOPAZ4, we show that both the atmospheric and oceanic circulation in the Nordic Seas (NS) act in tandem to explain the SIC variability in the south-western GS. Northerly wind anomalies associated with anomalously low sea level pressure (SLP) over the NS reduce the sea ice export in the south-western GS due to westward Ekman drift of sea ice. On the other hand, the positive wind stress curl strengthens the cyclonic Greenland Sea Gyre (GSG) circulation in the central GS. An intensified GSG circulation may result in stronger Ekman divergence of surface cold and fresh waters away from the south-western GS. Both of these processes can reduce the freshwater content and weaken the upper-ocean stratification in the south-western GS. At the same time, warm and saline Atlantic Water (AW) anomalies are recirculated from the FS region to the south-western GS by a stronger GSG circulation. Under weakly stratified conditions, enhanced vertical mixing of these subsurface AW anomalies can warm the surface waters and inhibit new sea ice formation, further reducing the SIC in the south-western GS. © Author(s) 2021. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164666
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Goa, India; School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa, India; Nansen Environmental and Remote Sensing Center, Bjerknes Centre for Climate Research, Bergen, Norway; The Vice-Chancellor's Office, University of Southern Denmark, Odense, Denmark; Geophysical Institute, University of Bergen, Bergen, Norway; Direction of Antarctic and Sub-Antarctic Programs, Universidad de Magallanes, Punta Arenas, Chile
Recommended Citation:
Chatterjee S.,Raj R.P.,Bertino L.,et al. Combined influence of oceanic and atmospheric circulations on Greenland sea ice concentration[J]. Cryosphere,2021-01-01,15(3)