Impact of the Alaskan Stream flow on surface water dynamics, temperature, ice extent, plankton biomass, and walleye pollock stocks in the eastern Okhotsk Sea

Prants, S. V.; Andreev, A. G.; Budyansky, M. V.; Uleysky, M. Yu.

doi:10.1016/j.jmarsys.2015.07.001

Cited by 17 publications

(5 citation statements)

References 23 publications

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“…The present study revealed that temperature signi cantly in uenced the groups like Chlorophyceae, Trebouxiophyceae, Zygnematophyceae, Euglenophyceae, and Cyanophyceae positively. Several authors had reported that Diatoms reported dominancy during winter (Prants et al, 2015). In our study, a signi cant negative correlation was found with Bacillariophyceae, Coscinodiscophyce,andMediophyceae.…”

Section: In Uence Of Climatic Changessupporting

confidence: 70%

Seasonal influence of physicochemical and climatic parameters on phytoplankton diversity and abundance pattern in community managed semi- impacted floodplain wetland

Das,

Mohanty,

Bhattachaya

et al. 2024

Preprint

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Wetlands provide numerous ecological services and are key habitats for aquatic flora and fauna. In the Beledanga wetland, the current study was conducted for three years, from July 2019 to June 2021, to evaluate the seasonal influence of physico-chemical parameters on phytoplankton diversity and abundance patterns. Overall 48 phytoplankton taxa were observed. Group Bacillariophyceae (27%) contributed the maximum to the total phytoplankton density. The total abundance of phytoplankton was found utmost during monsoon (4.081×103 unit l-1 ) and least during post-monsoon (3.316×103 unit l-1). One-way ANOVA indicated significant seasonal differences (p<0.05) for some genera. The study gave the idea about the most influencing physic-chemical parameters (DO, turbidity, total hardness, Ca2+, and nitrate) on the growth of phytoplankton with the help of different multivariate and univariate analysis (Canonical correspondence analysis, Karl Pearson’s correlation). The study again highlighted that climate parameters (temperature and rainfall) had some effect on the phytoplanktonic groups. Our study conceded that N: P in the studied wetland was less than the Redfield ratio (16:1) in all three seasons,while the Si:P ratio was noticed in the high range (15:1) during pre-monsoon. The value of theShannon diversity index and Margalef’s species richness index were noticed to be > 3, which signified quite rich in phytoplankton diversity and less pollution in the ecosystem. The algal pollution index was predominant during all the seasons, indicating a high organic load which might be due to seasonal jute retting and intensification of agricultural farming.

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Section: In Uence Of Climatic Changessupporting

confidence: 70%

Seasonal influence of physicochemical and climatic parameters on phytoplankton diversity and abundance pattern in community managed semi- impacted floodplain wetland

Das,

Mohanty,

Bhattachaya

et al. 2024

Preprint

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“…Interannual variations in the volume transport of the AS have been shown to affect the amount of AS water that reaches the Sea of Okhotsk. This variability leads to changes in nutrients, fish stocks, sea ice cover, and dense shelf water formation in this marginal sea [ Uehara et al ., ; Prants et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Zonal evolution of Alaskan Stream structure and transport quantified with Argo data

Logan

Johnson

2017

J. Geophys. Res. Oceans

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The Alaskan Stream (AS) flows west‐southwestward along the south side of Alaska and the Aleutian Island Arc; a western boundary current at the northern edge of the North Pacific subpolar gyre. The Argo float array has improved sampling of the Gulf of Alaska, allowing quantification of the AS's zonal evolution from 140°W to 175°W. Geostrophic alongshore transport of the AS in the upper 1000 dbar referenced to an assumed level of no motion at 1000 dbar shows little change from east to west. However, alongshore absolute geostrophic transports in the top 2000 dbar (obtained by combining mean absolute 1000‐dbar velocities from float displacements with the geostrophic velocity fields) generally increase to the west. We estimate full‐depth transports by fitting a barotropic and the first two baroclinic modes calculated from a climatology to the absolute geostrophic velocities in the upper 2000 dbar and applying the velocities from these fits from 2000 dbar to the seafloor. Flowing west from its formation region at 140°W–145°W the full‐depth AS becomes stronger, more barotropic, and also narrower once it reaches ∼160°W, with along‐shore transports increasing from −16.4 ± 4.9 Sv (1 Sv = 106 m3 s−1) at 140°W to −32.6 ± 5.2 Sv at 175°W. Mean concentrations of relatively warm, salty, oxygen‐poor, and nutrient‐rich Pacific Equatorial Water (PEW) in the AS decrease from 17.8% ± 0.3% to 8.5% ± 0.5% between 140°W and 175°W. However, the volume transport of PEW by the AS exhibits little change over the PEW density range between these longitudes.

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“…In order to track the origin of waters along the eastern SI coast in the warm and cold seasons, we have computed so-called Lagrangian drift maps with boundaries (Prants et al, 2013a;Prants, 2013;Prants et al, 2014Prants et al, , 2015. A domain in the Sea is seeded at a fixed date with a large number of tracers whose trajectories are computed backward in time for a given period of time (Prants, 2015).…”

Section: Methodsmentioning

confidence: 99%

Mesoscale circulation along the Sakhalin Island eastern coast

et al. 2017

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The seasonal and interannual variability of mesoscale circulation along the eastern coast of the Sakhalin Island in the Okhotsk Sea is investigated using AVISO velocity field and oceanographic data for the period from 1993 to 2016. It is found that mesoscale cyclones with the horizontal dimension of about 100 km occur there predominantly during summer, whereas anticyclones occur predominantly during fall and winter. The cyclones are generated due to the coastal upwelling forced by northward winds and the positive wind stress curl along the Sakhalin coast. The anticyclones are formed due to an inflow of low-salinity Amur-River waters from the Sakhalin Gulf intensified by southward winds and the negative wind stress curl in the cold season. The mesoscale cyclones support the high biological productivity at the eastern Sakhalin shelf in July - August

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Impact of the Alaskan Stream flow on surface water dynamics, temperature, ice extent, plankton biomass, and walleye pollock stocks in the eastern Okhotsk Sea

Cited by 17 publications

References 23 publications

Seasonal influence of physicochemical and climatic parameters on phytoplankton diversity and abundance pattern in community managed semi- impacted floodplain wetland

Seasonal influence of physicochemical and climatic parameters on phytoplankton diversity and abundance pattern in community managed semi- impacted floodplain wetland

Zonal evolution of Alaskan Stream structure and transport quantified with Argo data

Mesoscale circulation along the Sakhalin Island eastern coast

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