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Feistel, Rainer; Seifert, Torsten; Feistel, Sabine; Nausch, Gnther; Bogdańska, Barbara; Broman, Barry; Hansen, Lonny; Holfort, Jrgen; Mohrholz, Volker; Schmager, Gerhard; Hagen, Eberhard; Perlet, Ines; Wasmund, Norbert

doi:10.1002/9780470283134.ch20

Cited by 8 publications

(11 citation statements)

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“…The time series for the mean sea level of the Baltic was derived from observations at Landsort and Landsort Norra, published by the SMHI Opendata server (SMHI, 2018b). The station Landsort is the best representation of the mean sea level of the Baltic, well proved by several studies (Lisitzin, 1974;Jacobsen, 1980;Franck and Matthäus, 1992;Feistel et al, 2008). The station is located in the central Baltic near the knot line of the first barotropic basin mode (Wübber and Krauss, 1979;Jönsson et al, 2008 The standard deviation of remaining differences between both stations was 2.04 cm for the hourly data.…”

Section: Mean Sea Levelsupporting

confidence: 52%

“…For the Belt Sea, namely the Darss Sill area, daily salinity data are available from the Danish light vessel "Gedser Rev" between 1897 and 1976. This data set has two major gaps due to the world wars I and II (Feistel et al, 2008). A second data set of daily salinity observations from the MARNET station Darss Sill is available for the period 1992 till present.…”

Section: Salinity Datamentioning

confidence: 99%

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Major Baltic Inflow Statistics – Revised

2018

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Section: Mean Sea Levelsupporting

confidence: 52%

Section: Salinity Datamentioning

confidence: 99%

Major Baltic Inflow Statistics – Revised

2018

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“…This type of inflow is more frequent during the winter season, but may also occur during the other seasons. Baroclinic inflows, on the other hand, are driven by the density gradient between the Kattegat and the Baltic, and are common during long and calm summer periods (Knudsen, 1900;Hela, 1944;Feistel, Günther, et al, 2003;Feistel, Nausch, et al, 2003;Feistel et al, 2006;Mohrholz et al, 2006).…”

Section: Study Areamentioning

confidence: 99%

Spatial composition of the diahaline overturning circulation in a fjord-type, non-tidal estuarine system

Henell

Burchard

Gräwe

et al. 2023

Preprint

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In this study we present new insights into the overturning circulation in non-tidal, fjord-type estuarine systems driven by diahaline mixing. As a realistic example we analyze two years of numerical model results for the Baltic Sea, a brackish semi-enclosed marginal sea, characterized by strong freshwater surplus. An isohaline water mass transformation framework is applied to quantify and decompose the diahaline exchange flow. Time-averaged effective vertical diahaline velocity is directly calculated from the divergence of the transports below the respective isohaline surface. It is furthermore indirectly estimated from the gradient of local mixing per salinity class with respect to salinity. Under the assumption of negligible horizontal salt transports both estimates should be identical. Our analysis shows a high correlation between the spatial patterns of the two estimates for the diahaline exchange flow. Two dominant types of diahaline exchange flow are analyzed. First of all there is a large scale overturning circulation with inflow at places where the isohaline surface is close to the bottom and with outflow at places where the isohaline is surfacing. Secondly, there is the well-known small-scale overturning circulation localized inside the bottom boundary layer over sloping bathymetry, driven by boundary mixing. Both types of circulation are visualized across selected vertical transects in physical and in salinity space. One major result is that about 50% of the diahaline exchange flow patterns are generated by numerical mixing caused by the truncation error of the advection scheme, despite the fact that an anti-diffusive advection scheme and vertically-adaptive coordinates are used.

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“…This type of inflow is more frequent during the winter season, but may also occur during the other seasons. Baroclinic inflows, on the other hand, are driven by the density gradient between the Kattegat and the Baltic, and are common during long and calm summer periods (Feistel, Günther, et al, 2003;Feistel, Nausch, et al, 2003;Feistel et al, 2006;Hela, 1944;Knudsen, 1900;Mohrholz et al, 2006).…”

Section: Study Areamentioning

confidence: 99%

Spatial Composition of the Diahaline Overturning Circulation in a Fjord–Type, Non–Tidal Estuarine System

Henell,

Burchard,

Gräwe

et al. 2023

JGR Oceans

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In this study we present new insights into the overturning circulation in non‐tidal, fjord‐type estuarine systems associated with diahaline mixing. As a realistic example we analyze 2 years of numerical model results for the Baltic Sea, a brackish semi‐enclosed marginal sea, characterized by strong freshwater surplus. An isohaline water mass transformation framework is applied to quantify and decompose the diahaline exchange flow. Time‐averaged effective vertical diahaline velocity is directly calculated from the divergence of the transports below the respective isohaline surface. It is furthermore indirectly estimated from the gradient of local mixing per salinity class with respect to salinity. Under the assumption of negligible horizontal diffusive salt transports both estimates should be identical. Our analysis shows a high correlation between the spatial patterns of the two estimates for the diahaline exchange flow. Two dominant types of diahaline exchange flow are analyzed. First of all there is a large scale overturning circulation with inflow at places where the isohaline surface is close to the bottom and with outflow at places where the isohaline is surfacing. Secondly, there is the well‐known small‐scale overturning circulation localized inside the bottom boundary layer over sloping bathymetry, associated with boundary mixing. Both types of circulation are visualized across selected vertical transects in physical and in salinity space. One major result is that about 50% of the diahaline exchange flow patterns are generated by numerical mixing caused by the truncation error of the advection scheme, despite the fact that an anti‐diffusive advection scheme and vertically adaptive coordinates are used.

show abstract

Digital Supplement

Cited by 8 publications

References 0 publications

Major Baltic Inflow Statistics – Revised

Major Baltic Inflow Statistics – Revised

Spatial composition of the diahaline overturning circulation in a fjord-type, non-tidal estuarine system

Spatial Composition of the Diahaline Overturning Circulation in a Fjord–Type, Non–Tidal Estuarine System

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