气候变化领域集成服务门户(CCPortal): Interannual Change in Mode Waters: Case of the Black Sea

CCPortal

DOI	10.1029/2020JC016429
	Interannual Change in Mode Waters: Case of the Black Sea
	Stanev E.V.; Chtirkova B.
发表日期	2021
ISSN	21699275
卷号	126 期号:2
英文摘要	More than 6,000 profiles from profiling floats in the Black Sea over the 2005–2020 period were used to study the ventilation of this basin and the mixing pathways along isopycnals. The layer of the minimum potential vorticity (PV), the Black Sea pycnostad, approximately follows the core of the cold intermediate layer, similar to the case of oceanic mode waters. However, unlike in the ocean, the horizontal patterns of PV are shaped by cyclonic gyre circulation. There is a principle difference in the probability distribution of the thermohaline properties presented in geopotential coordinates from those presented in density coordinates. In the latter case, several mixing pathways, which are not known from previous studies, dominate the ocean states. These formed after three intermittent events of cold water formation. The density ratio decreased three times during the last 15 years, revealing the decreasing role of temperature in the vertical layering of the Black Sea halocline. The basin-wide distribution of PV above σθ = 16, which is where the maximum vertical density gradient appears, is opposite to the distribution below this depth. This finding suggests a complex change in the mesoscale dynamics in different layers. Comparisons of observations with data from the Copernicus Black Sea operational model demonstrate that the mixing parameterizations of models need further improvements. © 2020. The Authors.
英文关键词	cold intermediate layer; interannual variability; isopycnal and diapycnal mixing; mode water; potential vorticity; spiciness
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/186506
作者单位	Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; Department of Meteorology and Geophysics, Faculty of Physics, Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria; Research Department, Sofia University St. Kliment Ohridski, Sofia, Bulgaria; Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Stanev E.V.,Chtirkova B.. Interannual Change in Mode Waters: Case of the Black Sea[J],2021,126(2).
APA	Stanev E.V.,&Chtirkova B..(2021).Interannual Change in Mode Waters: Case of the Black Sea.Journal of Geophysical Research: Oceans,126(2).
MLA	Stanev E.V.,et al."Interannual Change in Mode Waters: Case of the Black Sea".Journal of Geophysical Research: Oceans 126.2(2021).