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S.g. Marinone - One of the best experts on this subject based on the ideXlab platform.
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three dimensional distribution of larval fish assemblages across a surface thermal chlorophyll front in a Semienclosed Sea
Estuarine Coastal and Shelf Science, 2009Co-Authors: A Danelljimenez, Laura Sanchezvelasco, M F Lavin, S.g. MarinoneAbstract:Abstract The oceanographic processes involved in marine fronts and their effects on the plankton are still a challenge in the understanding of marine ecosystems. This study examines the relationship of the three-dimensional distribution of larval fish assemblages (LFAs) with hydrography on a tidal-mixing surface thermal/chlorophyll front in the highly productive midriff archipelago of the Gulf of California during summer (August, 2005). Zooplankton samples were obtained on both sides of the front with an opening–closing net (505 μm) in 50-m strata from the surface to 200 m depth. The Bray–Curtis dissimilarity index defined three strata groups with different LFAs. On the cool side of the front, characterized by high chlorophyll, salinity, and dissolved oxygen, an LFA with the lowest larval abundance (97 larvae/10 m 2 ) and low taxa number (44) was defined. On the warm side of the front, where the lowest concentrations of surface dissolved oxygen and surface chlorophyll were recorded, an LFA was defined on the pycnocline, with the highest mean larval abundance and number of taxa (927 larvae/10 m 2 and 109 taxa); it was composed of epipelagic, mesopelagic, and demersal species. Also on the warm side of the front, but below the pycnocline, an LFA was observed with medium larval abundance and taxa number (126 larvae/10 m 2 and 28 taxa), formed by mesopelagic species. This assemblage was absent from the cool area to the northwest of the front, mainly from 150 to 50 m depth, where maximum-salinity water from the Northern Gulf was found. We conclude that the surface thermal/chlorophyll front had a profound effect on LFAs distribution in the surface layer, while the southward intrusion of maximum-salinity water from the Northern Gulf bounded the LFAs distribution in the deeper layer under the pycnocline. Therefore, in addition to the surface thermal/chlorophyll front, the hydrographic processes associated with the Gulf's Seasonal and thermohaline circulation affect the LFAs three-dimensional distribution. Similar relationships may occur in other ocean ecosystems.
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Three-dimensional distribution of larval fish assemblages across a surface thermal/chlorophyll front in a Semienclosed Sea
Estuarine Coastal and Shelf Science, 2009Co-Authors: A. Danell-jiménez, Laura Sánchez-velasco, Miguel F. Lavín, S.g. MarinoneAbstract:Abstract The oceanographic processes involved in marine fronts and their effects on the plankton are still a challenge in the understanding of marine ecosystems. This study examines the relationship of the three-dimensional distribution of larval fish assemblages (LFAs) with hydrography on a tidal-mixing surface thermal/chlorophyll front in the highly productive midriff archipelago of the Gulf of California during summer (August, 2005). Zooplankton samples were obtained on both sides of the front with an opening–closing net (505 μm) in 50-m strata from the surface to 200 m depth. The Bray–Curtis dissimilarity index defined three strata groups with different LFAs. On the cool side of the front, characterized by high chlorophyll, salinity, and dissolved oxygen, an LFA with the lowest larval abundance (97 larvae/10 m 2 ) and low taxa number (44) was defined. On the warm side of the front, where the lowest concentrations of surface dissolved oxygen and surface chlorophyll were recorded, an LFA was defined on the pycnocline, with the highest mean larval abundance and number of taxa (927 larvae/10 m 2 and 109 taxa); it was composed of epipelagic, mesopelagic, and demersal species. Also on the warm side of the front, but below the pycnocline, an LFA was observed with medium larval abundance and taxa number (126 larvae/10 m 2 and 28 taxa), formed by mesopelagic species. This assemblage was absent from the cool area to the northwest of the front, mainly from 150 to 50 m depth, where maximum-salinity water from the Northern Gulf was found. We conclude that the surface thermal/chlorophyll front had a profound effect on LFAs distribution in the surface layer, while the southward intrusion of maximum-salinity water from the Northern Gulf bounded the LFAs distribution in the deeper layer under the pycnocline. Therefore, in addition to the surface thermal/chlorophyll front, the hydrographic processes associated with the Gulf's Seasonal and thermohaline circulation affect the LFAs three-dimensional distribution. Similar relationships may occur in other ocean ecosystems.
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Larval fish assemblages, environment and circulation in a Semienclosed Sea (Gulf of California, Mexico)
Estuarine Coastal and Shelf Science, 2008Co-Authors: M. Peguero-icaza, Laura Sánchez-velasco, Miguel F. Lavín, S.g. MarinoneAbstract:Abstract Fish larvae and hydrographic data collected in the Gulf of California (GC) in December 2002 are used to describe larval fish assemblages (LFAs) and to explore their relationships with environmental variables (temperature, salinity, dissolved oxygen, fluorescence maximum, ϕ and superficial chlorophyll a ). The Bray–Curtis dissimilarity index defined three LFAs, distributed in areas with distinctly different environmental conditions. The affinity of most of the species with the environmental characteristics of their areas of distribution could be interpreted as an indication that spawning occurred inside those areas. Particle tracking in current fields from a 3D numerical model and connectivity matrices are used to assess larval retention in the LFA areas. The technique is well suited for Seas like the GC that have well-defined circulation patterns. On time scales around 30 days, retention (from 56% to 73% of the particles) occurred (1) for the North LFA in the Upper GC, (2) for the Channel-Center LFA in the anticyclone over the Northern GC and in Ballenas Channel, and (3) for the South LFA in the eddy over San Pedro Martir basin and in the shallow zone off the peninsula. Therefore, the Lagrangian analysis revealed that the observed LFAs have a permanency long enough to allow fish larvae to remain in a favorable environment until they develop motility. The main particle export path (less than 26% of the particles) was from the North to the South LFA, following the anticyclonic main flow and coinciding with the gradient in species number and larval abundance.
Ichiro Fukumori - One of the best experts on this subject based on the ideXlab platform.
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A near uniform basin‐wide Sea level fluctuation over the Japan/East Sea: A Semienclosed Sea with multiple straits
Journal of Geophysical Research, 2008Co-Authors: Seung-bum Kim, Ichiro FukumoriAbstract:[1] Sea level of the Japan/East Sea observed by the TOPEX/Poseidon (T/P) satellite altimeter is analyzed using a 1/4°-resolution ocean general circulation model. A significant fraction of the Japan/East Sea Sea level variability is found to be spatially uniform with periods ranging from 20 d to a year. The model simulation is consistent with T/P records in terms of the basin-wide Sea level fluctuation's spectral energy and coherence. The simulation indicates that the changes are barotropic in nature and controlled, notably at high frequencies, by the net mass transport through the straits of the Japan/East Sea driven by winds in the vicinity of the Korea/Tsushima and Soya Straits. A series of barotropic simulations suggest that the Sea level fluctuations are the result of a dynamic balance at the straits among near-strait winds, friction, and geostrophic control. The basin-wide Sea level response is a linear superposition of changes due to winds near the individual straits. In particular, a basin-wide Sea level response can be established by winds near either one of the straits alone. For the specific geometry and winds, winds near the Soya Strait have a larger impact on the Japan/East Sea mean Sea level than those near the Korea/Tsushima Strait.
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a near uniform basin wide Sea level fluctuation over the japan east Sea a Semienclosed Sea with multiple straits
Journal of Geophysical Research, 2008Co-Authors: Seung-bum Kim, Ichiro FukumoriAbstract:[1] Sea level of the Japan/East Sea observed by the TOPEX/Poseidon (T/P) satellite altimeter is analyzed using a 1/4°-resolution ocean general circulation model. A significant fraction of the Japan/East Sea Sea level variability is found to be spatially uniform with periods ranging from 20 d to a year. The model simulation is consistent with T/P records in terms of the basin-wide Sea level fluctuation's spectral energy and coherence. The simulation indicates that the changes are barotropic in nature and controlled, notably at high frequencies, by the net mass transport through the straits of the Japan/East Sea driven by winds in the vicinity of the Korea/Tsushima and Soya Straits. A series of barotropic simulations suggest that the Sea level fluctuations are the result of a dynamic balance at the straits among near-strait winds, friction, and geostrophic control. The basin-wide Sea level response is a linear superposition of changes due to winds near the individual straits. In particular, a basin-wide Sea level response can be established by winds near either one of the straits alone. For the specific geometry and winds, winds near the Soya Strait have a larger impact on the Japan/East Sea mean Sea level than those near the Korea/Tsushima Strait.
A Danelljimenez - One of the best experts on this subject based on the ideXlab platform.
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three dimensional distribution of larval fish assemblages across a surface thermal chlorophyll front in a Semienclosed Sea
Estuarine Coastal and Shelf Science, 2009Co-Authors: A Danelljimenez, Laura Sanchezvelasco, M F Lavin, S.g. MarinoneAbstract:Abstract The oceanographic processes involved in marine fronts and their effects on the plankton are still a challenge in the understanding of marine ecosystems. This study examines the relationship of the three-dimensional distribution of larval fish assemblages (LFAs) with hydrography on a tidal-mixing surface thermal/chlorophyll front in the highly productive midriff archipelago of the Gulf of California during summer (August, 2005). Zooplankton samples were obtained on both sides of the front with an opening–closing net (505 μm) in 50-m strata from the surface to 200 m depth. The Bray–Curtis dissimilarity index defined three strata groups with different LFAs. On the cool side of the front, characterized by high chlorophyll, salinity, and dissolved oxygen, an LFA with the lowest larval abundance (97 larvae/10 m 2 ) and low taxa number (44) was defined. On the warm side of the front, where the lowest concentrations of surface dissolved oxygen and surface chlorophyll were recorded, an LFA was defined on the pycnocline, with the highest mean larval abundance and number of taxa (927 larvae/10 m 2 and 109 taxa); it was composed of epipelagic, mesopelagic, and demersal species. Also on the warm side of the front, but below the pycnocline, an LFA was observed with medium larval abundance and taxa number (126 larvae/10 m 2 and 28 taxa), formed by mesopelagic species. This assemblage was absent from the cool area to the northwest of the front, mainly from 150 to 50 m depth, where maximum-salinity water from the Northern Gulf was found. We conclude that the surface thermal/chlorophyll front had a profound effect on LFAs distribution in the surface layer, while the southward intrusion of maximum-salinity water from the Northern Gulf bounded the LFAs distribution in the deeper layer under the pycnocline. Therefore, in addition to the surface thermal/chlorophyll front, the hydrographic processes associated with the Gulf's Seasonal and thermohaline circulation affect the LFAs three-dimensional distribution. Similar relationships may occur in other ocean ecosystems.
Seung-bum Kim - One of the best experts on this subject based on the ideXlab platform.
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A near uniform basin‐wide Sea level fluctuation over the Japan/East Sea: A Semienclosed Sea with multiple straits
Journal of Geophysical Research, 2008Co-Authors: Seung-bum Kim, Ichiro FukumoriAbstract:[1] Sea level of the Japan/East Sea observed by the TOPEX/Poseidon (T/P) satellite altimeter is analyzed using a 1/4°-resolution ocean general circulation model. A significant fraction of the Japan/East Sea Sea level variability is found to be spatially uniform with periods ranging from 20 d to a year. The model simulation is consistent with T/P records in terms of the basin-wide Sea level fluctuation's spectral energy and coherence. The simulation indicates that the changes are barotropic in nature and controlled, notably at high frequencies, by the net mass transport through the straits of the Japan/East Sea driven by winds in the vicinity of the Korea/Tsushima and Soya Straits. A series of barotropic simulations suggest that the Sea level fluctuations are the result of a dynamic balance at the straits among near-strait winds, friction, and geostrophic control. The basin-wide Sea level response is a linear superposition of changes due to winds near the individual straits. In particular, a basin-wide Sea level response can be established by winds near either one of the straits alone. For the specific geometry and winds, winds near the Soya Strait have a larger impact on the Japan/East Sea mean Sea level than those near the Korea/Tsushima Strait.
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a near uniform basin wide Sea level fluctuation over the japan east Sea a Semienclosed Sea with multiple straits
Journal of Geophysical Research, 2008Co-Authors: Seung-bum Kim, Ichiro FukumoriAbstract:[1] Sea level of the Japan/East Sea observed by the TOPEX/Poseidon (T/P) satellite altimeter is analyzed using a 1/4°-resolution ocean general circulation model. A significant fraction of the Japan/East Sea Sea level variability is found to be spatially uniform with periods ranging from 20 d to a year. The model simulation is consistent with T/P records in terms of the basin-wide Sea level fluctuation's spectral energy and coherence. The simulation indicates that the changes are barotropic in nature and controlled, notably at high frequencies, by the net mass transport through the straits of the Japan/East Sea driven by winds in the vicinity of the Korea/Tsushima and Soya Straits. A series of barotropic simulations suggest that the Sea level fluctuations are the result of a dynamic balance at the straits among near-strait winds, friction, and geostrophic control. The basin-wide Sea level response is a linear superposition of changes due to winds near the individual straits. In particular, a basin-wide Sea level response can be established by winds near either one of the straits alone. For the specific geometry and winds, winds near the Soya Strait have a larger impact on the Japan/East Sea mean Sea level than those near the Korea/Tsushima Strait.
M F Lavin - One of the best experts on this subject based on the ideXlab platform.
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three dimensional distribution of larval fish assemblages across a surface thermal chlorophyll front in a Semienclosed Sea
Estuarine Coastal and Shelf Science, 2009Co-Authors: A Danelljimenez, Laura Sanchezvelasco, M F Lavin, S.g. MarinoneAbstract:Abstract The oceanographic processes involved in marine fronts and their effects on the plankton are still a challenge in the understanding of marine ecosystems. This study examines the relationship of the three-dimensional distribution of larval fish assemblages (LFAs) with hydrography on a tidal-mixing surface thermal/chlorophyll front in the highly productive midriff archipelago of the Gulf of California during summer (August, 2005). Zooplankton samples were obtained on both sides of the front with an opening–closing net (505 μm) in 50-m strata from the surface to 200 m depth. The Bray–Curtis dissimilarity index defined three strata groups with different LFAs. On the cool side of the front, characterized by high chlorophyll, salinity, and dissolved oxygen, an LFA with the lowest larval abundance (97 larvae/10 m 2 ) and low taxa number (44) was defined. On the warm side of the front, where the lowest concentrations of surface dissolved oxygen and surface chlorophyll were recorded, an LFA was defined on the pycnocline, with the highest mean larval abundance and number of taxa (927 larvae/10 m 2 and 109 taxa); it was composed of epipelagic, mesopelagic, and demersal species. Also on the warm side of the front, but below the pycnocline, an LFA was observed with medium larval abundance and taxa number (126 larvae/10 m 2 and 28 taxa), formed by mesopelagic species. This assemblage was absent from the cool area to the northwest of the front, mainly from 150 to 50 m depth, where maximum-salinity water from the Northern Gulf was found. We conclude that the surface thermal/chlorophyll front had a profound effect on LFAs distribution in the surface layer, while the southward intrusion of maximum-salinity water from the Northern Gulf bounded the LFAs distribution in the deeper layer under the pycnocline. Therefore, in addition to the surface thermal/chlorophyll front, the hydrographic processes associated with the Gulf's Seasonal and thermohaline circulation affect the LFAs three-dimensional distribution. Similar relationships may occur in other ocean ecosystems.
