气候变化领域集成服务门户(CCPortal): Revisiting the Role of Convective Deep Water Formation in Northern Baltic Sea Bottom Water Renewal

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DOI	10.1029/2020JC016114
	Revisiting the Role of Convective Deep Water Formation in Northern Baltic Sea Bottom Water Renewal
	Giesse C.; Meier H.E.M.; Neumann T.; Moros M.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	Deep water renewal and ventilation of the Baltic Sea is commonly considered to occur solely via saltwater inflows from the North Sea. However, recent analysis of geophysical and sediment proxy data suggests convective deep water formation during wintertime as a second process that has contributed to the ventilation of the northern and central Baltic Sea bottom waters during cold climate periods. Here, we investigate the role of deep water formation in the northern Baltic Sea in a regional ocean circulation model. Selecting the particularly cold winter 1986/1987 as a reference period, we perform sensitivity experiments in which the atmospheric temperature forcing is changed and/or localized brine rejection on subgrid scales is accounted for through a parameterization. We study the sinking and circulation of water masses via passive tracers introduced into the model. Generally, our model results support the established view that convective deep water formation does not play a major role in Baltic Sea deep water renewal. While a reduction of air temperatures does not qualitatively change the sinking and circulation of water masses in our experiments, brine rejection could potentially lead to localized deep water formation. However, the impact is too weak to possibly change the large-scale deep water exchange between the Baltic proper and the northern Baltic sub-basins. Although being in line with established knowledge, through consideration of the model limitations, our results provide insights on how and under which circumstances convective deep water formation could potentially have occurred during cold climate periods. ©2020. The Authors.
英文关键词	Baltic Sea; brine rejection; convection; deep water formation; ventilation
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/186615
作者单位	Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Rostock, Germany; Institute of Oceanography, CEN, Universität Hamburg, Hamburg, Germany; International Max Planck Research School on Earth System Modelling, Max Planck Institute for Meteorology, Hamburg, Germany; Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
推荐引用方式 GB/T 7714	Giesse C.,Meier H.E.M.,Neumann T.,et al. Revisiting the Role of Convective Deep Water Formation in Northern Baltic Sea Bottom Water Renewal[J],2020,125(10).
APA	Giesse C.,Meier H.E.M.,Neumann T.,&Moros M..(2020).Revisiting the Role of Convective Deep Water Formation in Northern Baltic Sea Bottom Water Renewal.Journal of Geophysical Research: Oceans,125(10).
MLA	Giesse C.,et al."Revisiting the Role of Convective Deep Water Formation in Northern Baltic Sea Bottom Water Renewal".Journal of Geophysical Research: Oceans 125.10(2020).