气候变化领域集成服务门户(CCPortal): Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean

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DOI	10.1029/2019JC015526
	Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean
	Koenig Z.; Fer I.; Kolås E.; Fossum T.O.; Norgren P.; Ludvigsen M.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	High-resolution ocean temperature, salinity, current, and turbulence data were collected at an Arctic thermohaline front in the Nansen Basin. The front was close to the sea ice edge and separated the cold and fresh surface melt water from the warm and saline mixed layer. Measurements were made on 18 September 2018, in the upper 100 m, from a research vessel and an autonomous underwater vehicle. Destabilizing surface buoyancy fluxes from a combination of heat loss to the atmosphere and cross-front Ekman transport by down-front winds reduced the potential vorticity in the upper ocean. Turbulence structure in the mixed layer was generally consistent with turbulence production through convection by heat loss to atmosphere and mechanical forcing by moderate winds. Conditions at the front were favorable for forced symmetric instability, a mechanism drawing energy from the frontal geostrophic current. A clear signature of increased dissipation from symmetric instability could not be identified; however, this instability could potentially account for the increased dissipation rates at the front location down to 40 m depth that could not be explained by the atmospheric forcing. This turbulence was associated with turbulent heat fluxes of up to 10 W m−2, eroding the warm and cold intrusions observed between 30 and 60 m depth. A Seaglider sampled across a similar frontal structure in the same region 10 days after our survey. The submesoscale-to-turbulence-scale transitions and resulting mixing can be widespread and important in the Atlantic sector of the Arctic Ocean. ©2020. The Authors.
英文关键词	Arctic Ocean; AUV; convection; frontal system; Nansen Legacy Project; turbulence
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/186918
作者单位	Geophysical Institute and Bjerknes Center for Climate Research, University of Bergen, Bergen, Norway; Norwegian Polar Institute, Tromsø, Norway; Department of Marine Technology, Norwegian University of Science and Technology, Trondheim, Norway
推荐引用方式 GB/T 7714	Koenig Z.,Fer I.,Kolås E.,et al. Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean[J],2020,125(4).
APA	Koenig Z.,Fer I.,Kolås E.,Fossum T.O.,Norgren P.,&Ludvigsen M..(2020).Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean.Journal of Geophysical Research: Oceans,125(4).
MLA	Koenig Z.,et al."Observations of Turbulence at a Near-Surface Temperature Front in the Arctic Ocean".Journal of Geophysical Research: Oceans 125.4(2020).