气候变化领域集成服务门户(CCPortal): Supercooled Southern Ocean Waters

CCPortal

DOI	10.1029/2020GL090242
	Supercooled Southern Ocean Waters
	Haumann F.A.; Moorman R.; Riser S.C.; Smedsrud L.H.; Maksym T.; Wong A.P.S.; Wilson E.A.; Drucker R.; Talley L.D.; Johnson K.S.; Key R.M.; Sarmiento J.L.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	In cold polar waters, temperatures sometimes drop below the freezing point, a process referred to as supercooling. However, observational challenges in polar regions limit our understanding of the spatial and temporal extent of this phenomenon. We here provide observational evidence that supercooled waters are much more widespread in the seasonally ice-covered Southern Ocean than previously reported. In 5.8% of all analyzed hydrographic profiles south of 55°S, we find temperatures below the surface freezing point (“potential” supercooling), and half of these have temperatures below the local freezing point (“in situ” supercooling). Their occurrence doubles when neglecting measurement uncertainties. We attribute deep coastal-ocean supercooling to melting of Antarctic ice shelves and surface-induced supercooling in the seasonal sea-ice region to wintertime sea-ice formation. The latter supercooling type can extend down to the permanent pycnocline due to convective sinking plumes—an important mechanism for vertical tracer transport and water-mass structure in the polar ocean. ©2020. The Authors.
英文关键词	Freezing; Oceanography; Sea ice; Uncertainty analysis; Antarctic ice shelves; Hydrographic profiles; Measurement uncertainty; Sea ice formations; Supercooled water; Surface freezing; Tracer transport; Water mass structure; Supercooling; freezing; hydrographic survey; ice cover; plume; pycnocline; sea ice; supercooling; tracer; water mass; Antarctic Ice Sheet; Antarctica; Southern Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169596
作者单位	Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, United States; British Antarctic Survey, Cambridge, United Kingdom; School of Oceanography, University of Washington, Seattle, WA, United States; Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; University Centre in Svalbard, Longyearbyen, Svalbard and Jan Mayen; Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Environmental Sciences and Engineering, California Institute of Technology, Pasadena, CA, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
推荐引用方式 GB/T 7714	Haumann F.A.,Moorman R.,Riser S.C.,et al. Supercooled Southern Ocean Waters[J],2020,47(20).
APA	Haumann F.A..,Moorman R..,Riser S.C..,Smedsrud L.H..,Maksym T..,...&Sarmiento J.L..(2020).Supercooled Southern Ocean Waters.Geophysical Research Letters,47(20).
MLA	Haumann F.A.,et al."Supercooled Southern Ocean Waters".Geophysical Research Letters 47.20(2020).