气候变化领域集成服务门户(CCPortal): FRIS Revisited in 2018: On the Circulation and Water Masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea

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DOI	10.1029/2021JC017269
	FRIS Revisited in 2018: On the Circulation and Water Masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea
	Janout M.A.; Hellmer H.H.; Hattermann T.; Huhn O.; Sültenfuss J.; Østerhus S.; Stulic L.; Ryan S.; Schröder M.; Kanzow T.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	The Filchner-Ronne Ice Shelf (FRIS) is characterized by moderate basal melt rates due to the near-freezing waters that dominate the wide southern Weddell Sea continental shelf. We revisited the region in austral summer 2018 with detailed hydrographic and noble gas surveys along FRIS. The FRIS front was characterized by High Salinity Shelf Water (HSSW) in Ronne Depression, Ice Shelf Water (ISW) on its eastern flank, and an inflow of modified Warm Deep Water (mWDW) entering through Central Trough. Filchner Trough was dominated by Ronne HSSW-sourced ISW, likely forced by a recently intensified circulation beneath FRIS due to enhanced sea ice production in the Ronne polynya since 2015. Glacial meltwater fractions and tracer-based water mass dating indicate two separate ISW outflow cores, one hugging the Berkner slope after a two-year travel time, and the other located in the central Filchner Trough following a ∼six year-long transit through the FRIS cavity. Historical measurements indicate the presence of two distinct modes, in which water masses in Filchner Trough were dominated by either Ronne HSSW-derived ISW (Ronne-mode) or more locally derived Berkner-HSSW (Berkner-mode). While the dominance of these modes has alternated on interannual time scales, ocean densities in Filchner Trough have remained remarkably stable since the first surveys in 1980. Indeed, geostrophic velocities indicated outflowing ISW-cores along the trough's western flank and onto Berkner Bank, which suggests that Ronne-ISW preconditions Berkner-HSSW production. The negligible density difference between Berkner- and Ronne-mode waters indicates that each contributes cold dense shelf waters to protect FRIS against inflowing mWDW. © 2021. The Authors.
英文关键词	Filcher and Ronne shelves; Ocean circulation; ocean-ice shelf interaction; water masses; Weddell Sea
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186257
作者单位	Alfred-Wegener-Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany; Norwegian Polar Institute, Tromsø, Norway; Institute of Environmental Physics, University Bremen, Germany; Norwegian Research Center, Bergen, Norway; Bjerknes Centre for Climate Research, University of Bergen, Norway; Woods Hole Oceanographic Institution, Woods Hole, United States
推荐引用方式 GB/T 7714	Janout M.A.,Hellmer H.H.,Hattermann T.,et al. FRIS Revisited in 2018: On the Circulation and Water Masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea[J],2021,126(6).
APA	Janout M.A..,Hellmer H.H..,Hattermann T..,Huhn O..,Sültenfuss J..,...&Kanzow T..(2021).FRIS Revisited in 2018: On the Circulation and Water Masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea.Journal of Geophysical Research: Oceans,126(6).
MLA	Janout M.A.,et al."FRIS Revisited in 2018: On the Circulation and Water Masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea".Journal of Geophysical Research: Oceans 126.6(2021).