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Physical-Biological Coupling in the Western South China Sea: The Response of Phytoplankton Community to a Mesoscale Cyclonic Eddy.

Wang L, Huang B, Chiang KP, Liu X, Chen B, Xie Y, Xu Y, Hu J, Dai M - PLoS ONE (2016)

Bottom Line: However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001).The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping.So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of the Coastal and Wetland Ecosystems, the Ministry of Education, Xiamen University, Xiamen, China.

ABSTRACT
It is widely recognized that the mesoscale eddies play an important part in the biogeochemical cycle in ocean ecosystem, especially in the oligotrophic tropical zones. So here a heterogeneous cyclonic eddy in its flourishing stage was detected using remote sensing and in situ biogeochemical observation in the western South China Sea (SCS) in early September, 2007. The high-performance liquid chromatography method was used to identify the photosynthetic pigments. And the CHEMical TAXonomy (CHEMTAX) was applied to calculate the contribution of nine phytoplankton groups to the total chlorophyll a (TChl a) biomass. The deep chlorophyll a maximum layer (DCML) was raised to form a dome structure in the eddy center while there was no distinct enhancement for TChl a biomass. The integrated TChl a concentration in the upper 100 m water column was also constant from the eddy center to the surrounding water outside the eddy. However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001). Thus, the slight enhancement of TChl a biomass of euphotic zone integration within the eddy was mainly from the phytoplankton in the upper mixed zone rather than the DCML. The phytoplankton community was primarily contributed by diatoms, prasinophytes, and Synechococcus at the DCML within the eddy, while less was contributed by haptophytes_8 and Prochlorococcus. The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping. The doming isopycnal within the eddy supplied nutrients gently into the upper mixing layer, and there was remarkable enhancement in phytoplankton biomass at the surface layer with 10.5% TChl a biomass of water column in eddy center and 3.7% at reference stations. So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

No MeSH data available.


Related in: MedlinePlus

Three-dimensional structures of (A) temperature [°C], (B) salinity and (C) total chlorophyll a [mg m-3] in the western SCS during the cruise.
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pone.0153735.g003: Three-dimensional structures of (A) temperature [°C], (B) salinity and (C) total chlorophyll a [mg m-3] in the western SCS during the cruise.

Mentions: The CTD profile data were utilized to determine the three-dimensional structures of temperature and salinity in the C2 (Fig 3A and 3B). A low temperature and high salinity water (< 20°C, salinity >34.2) rose from 100 m to the near surface zone (25 m) in C2 center. The cold core outcrop (< 25°C) was observed at the 25 m layer with a diameter of about 100~150 km. There was no notable signature of cooler water at the surface layer (5 m), but more distinct water masses could be distinguished based on the salinity distribution. A lower salinity Mekong River Plume Water (salinity <31.5) was observed at the 5 m and 25 m layers in Transect Y3. The plume drifted eastwardly and its tongue extended to 111.5°E. More details concerning the C2’s physical dynamic mechanism had been sufficiently reported [28], as well as the Mekong River plume [13].


Physical-Biological Coupling in the Western South China Sea: The Response of Phytoplankton Community to a Mesoscale Cyclonic Eddy.

Wang L, Huang B, Chiang KP, Liu X, Chen B, Xie Y, Xu Y, Hu J, Dai M - PLoS ONE (2016)

Three-dimensional structures of (A) temperature [°C], (B) salinity and (C) total chlorophyll a [mg m-3] in the western SCS during the cruise.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835056&req=5

pone.0153735.g003: Three-dimensional structures of (A) temperature [°C], (B) salinity and (C) total chlorophyll a [mg m-3] in the western SCS during the cruise.
Mentions: The CTD profile data were utilized to determine the three-dimensional structures of temperature and salinity in the C2 (Fig 3A and 3B). A low temperature and high salinity water (< 20°C, salinity >34.2) rose from 100 m to the near surface zone (25 m) in C2 center. The cold core outcrop (< 25°C) was observed at the 25 m layer with a diameter of about 100~150 km. There was no notable signature of cooler water at the surface layer (5 m), but more distinct water masses could be distinguished based on the salinity distribution. A lower salinity Mekong River Plume Water (salinity <31.5) was observed at the 5 m and 25 m layers in Transect Y3. The plume drifted eastwardly and its tongue extended to 111.5°E. More details concerning the C2’s physical dynamic mechanism had been sufficiently reported [28], as well as the Mekong River plume [13].

Bottom Line: However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001).The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping.So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of the Coastal and Wetland Ecosystems, the Ministry of Education, Xiamen University, Xiamen, China.

ABSTRACT
It is widely recognized that the mesoscale eddies play an important part in the biogeochemical cycle in ocean ecosystem, especially in the oligotrophic tropical zones. So here a heterogeneous cyclonic eddy in its flourishing stage was detected using remote sensing and in situ biogeochemical observation in the western South China Sea (SCS) in early September, 2007. The high-performance liquid chromatography method was used to identify the photosynthetic pigments. And the CHEMical TAXonomy (CHEMTAX) was applied to calculate the contribution of nine phytoplankton groups to the total chlorophyll a (TChl a) biomass. The deep chlorophyll a maximum layer (DCML) was raised to form a dome structure in the eddy center while there was no distinct enhancement for TChl a biomass. The integrated TChl a concentration in the upper 100 m water column was also constant from the eddy center to the surrounding water outside the eddy. However the TChl a biomass in the surface layer (at 5 m) in the eddy center was promoted 2.6-fold compared to the biomass outside the eddy (p < 0.001). Thus, the slight enhancement of TChl a biomass of euphotic zone integration within the eddy was mainly from the phytoplankton in the upper mixed zone rather than the DCML. The phytoplankton community was primarily contributed by diatoms, prasinophytes, and Synechococcus at the DCML within the eddy, while less was contributed by haptophytes_8 and Prochlorococcus. The TChl a biomass for most of the phytoplankton groups increased at the surface layer in the eddy center under the effect of nutrient pumping. The doming isopycnal within the eddy supplied nutrients gently into the upper mixing layer, and there was remarkable enhancement in phytoplankton biomass at the surface layer with 10.5% TChl a biomass of water column in eddy center and 3.7% at reference stations. So the slight increasing in the water column integrated phytoplankton biomass might be attributed to the stimulated phytoplankton biomass at the surface layer.

No MeSH data available.


Related in: MedlinePlus