Circulation of water masses in the Baltic Proper revealed through iodine isotopes

Yi, Peng; Chen, X. G.; Aldahan, Ala; Possnert, Göran; Hou, Xiaolin; Yu, Zhongbo; Xiong, De-qi; Wang, Biao

doi:10.1016/j.apgeochem.2013.05.014

Cited by 3 publications

(4 citation statements)

References 38 publications

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“…Initial dispersal is therefore expected to happen along deep‐water currents. Prevailing deep‐water currents in spring flow northward in the Easter Gotland Basin (Yi et al, ). South of the Åland archipelago, the depth of the Northern Baltic Sea decreases to less than 60 m, and the deep‐water current flowing northward from the EGB is deflected eastward toward the GoF (Yi et al, ; Figure b).…”

Section: Methodsmentioning

confidence: 99%

“…Prevailing deep‐water currents in spring flow northward in the Easter Gotland Basin (Yi et al, ). South of the Åland archipelago, the depth of the Northern Baltic Sea decreases to less than 60 m, and the deep‐water current flowing northward from the EGB is deflected eastward toward the GoF (Yi et al, ; Figure b). While we do not have access to circulation data for past four decades, data from the past two decades (accessed through E.U.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, deep-water currents could transport pelagic propagules from southern spawning grounds into the GoF, but not to the AS. In the western Åland archipelago, there is also a prevailing and strong north to south flow of surface freshwater from the Bothnian Bay in spring(Maslowski & Walczowski, 2002;Yi et al, 2013, see also Figure1cand Supporting information FiguresS2-S5), which would present an additional barrier to the northward dispersal of flounder eggs and larvae.…”

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confidence: 99%

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Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Momigliano

Jokinen

Calboli

et al. 2019

Evolutionary Applications

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Unobserved diversity, such as undetected genetic structure or the presence of cryptic species, is of concern for the conservation and management of global biodiversity in the face of threatening anthropogenic processes. For instance, unobserved diversity can lead to overestimation of maximum sustainable yields and therefore to overharvesting of the more vulnerable stock components within unrecognized mixed‐stock fisheries. We used DNA from archival (otolith) samples to reconstruct the temporal (1976–2011) genetic makeup of two mixed‐stock flounder fisheries in the Åland Sea (AS) and the Gulf of Finland (GoF). Both fisheries have hitherto been managed as a single stock of European flounders ( Platichthys flesus ), but were recently revealed to target two closely related species: the pelagic‐spawning P. flesus and the newly described, demersal‐spawning P. solemdali . While the AS and GoF fisheries were assumed to consist exclusively of P. solemdali , P. flesus dominated the GoF flounder assemblage (87% of total) in 1983, had disappeared (0%) by 1993, and remained in low proportions (10%–11%) thereafter. In the AS, P. solemdali dominated throughout the sampling period (>70%), and P. flesus remained in very low proportions after 1983. The disappearance of P. flesus from the GoF coincides in time with a dramatic (~60%) decline in commercial landings and worsening environmental conditions in P. flesus’ northernmost spawning ground, the Eastern Gotland Basin, in the preceding 4–6 years. These results are compatible with the hypothesis that P. flesus in the GoF is a sink population relying on larval subsidies from southern spawning grounds and the cause of their disappearance is a cessation of larval supply. Our results highlight the importance of uncovering unobserved genetic diversity and studying spatiotemporal changes in the relative contribution of different stock components, as well as the underlying environmental causes, to manage marine resources in the age of rapid anthropogenic change.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Momigliano

Jokinen

Calboli

et al. 2019

Evolutionary Applications

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“…The Baltic Sea's flow patterns vary seasonally, with freezing in some areas during winters and stratification with thermocline development in summers (Stramska et al, 2013). Complex coastlines, islands, and the Coriolis effect further influence flow patterns, causing currents to deflect to the right in the Northern Hemisphere (Lehmann et al, 2002;Reissmann et al, 2009;Yi et al, 2013).…”

Section: Description Of the Study Areamentioning

confidence: 99%

Investigating the influence of sub-mesoscale current structures on Baltic Sea connectivity through a Lagrangian analysis

Hariri,

Meier,

Väli

2024

Front. Mar. Sci.

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This study explores the impact of sub-mesoscale structures and vertical advection on the connectivity properties of the Baltic Sea using a Lagrangian approach. High-resolution flow fields from the General Estuarine Transport Model (GETM) were employed to compute Lagrangian trajectories, focusing on the influence of fine-scale structures on connectivity estimates. Six river mouths in the Baltic Sea served as initial positions for numerical particles, and trajectories were generated using flow fields with varying horizontal resolutions: 3D trajectories with 250m resolution as well as 2D trajectories with 250m and 1km resolutions. Several Lagrangian indices, such as mean transit time, arrival depths, and probability density functions of transit times, were analyzed to unravel the complex circulation of the Baltic Sea and highlight the substantial impact of sub-mesoscale structures on numerical trajectories. Results indicate that in 2D simulations, particles exhibit faster movement on the eastern side of the Gotland Basin in high-resolution compared to coarse-resolution simulations. This difference is attributed to the stronger coastal current in high-resolution compared to coarse-resolution simulations. Additionally, the study investigates the influence of vertical advection on numerical particle motion within the Baltic Sea, considering the difference between 3D and 2D trajectories. Findings reveal that denser water in the eastern and south-eastern areas significantly affects particle dispersion in 3D simulations, resulting in increased transit times. Conversely, regions in the North-western part of the basin accelerate particle movement in 3D compared to the 2D simulations. Finally, we calculated the average residence time of numerical particles exiting the Baltic Sea through the Danish strait. Results show an average surface layer residence time of approximately 790 days over an eight-year integration period, highlighting the relatively slow water circulation in the semi-enclosed Baltic Sea basin. This prolonged residence time emphasizes the potential for the accumulation of pollutants. Overall, the study underscores the pivotal role of fine-scale structures in shaping the connectivity of the Baltic Sea, with implications for understanding and managing environmental challenges in this unique marine ecosystem.

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Estimation of 129I inventory in the oceans

Chen

Liu

et al. 2015

J Radioanal Nucl Chem

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Spatial distribution of oceanic 129 I inventory presented here is based on collection of data from published literatures coupled with model calculation using ArcGIS software tools. A total of 363 thiessen polygons were created for the oceans in order to cover the tremendous variability in distribution of 129 I data range. The results indicate that total 129 I oceanic inventory is approximately 7310 kg, which is mainly stored in the region of the North Atlantic and the Arctic Oceans. The concentrations of 129 I in the oceans are 3-4 orders of magnitude higher than the pre-anthropogenic level reflecting effects of post 1945 anthropogenic activities.

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Circulation of water masses in the Baltic Proper revealed through iodine isotopes

Cited by 3 publications

References 38 publications

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Cryptic temporal changes in stock composition explain the decline of a flounder (Platichthys spp.) assemblage

Investigating the influence of sub-mesoscale current structures on Baltic Sea connectivity through a Lagrangian analysis

Estimation of 129I inventory in the oceans

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