The use of radar altimeter data in combination with other satellite sensors for routine monitoring of the ocean: Case study of the northern Arabian Sea and Gulf of Oman

Stapleton, Nabila; Aicken, W.; Dovey, P. R.; Scott, J.

doi:10.5589/m02-053

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Merged altimeter products generated from multiple altimetry missions are used in tracking mesoscale processes (Ducet and Le Traon 1999). The synergy between altimeter-based SSH, ocean colour-based chlorophyll, and thermal/microwave-based SST in understanding mesoscale features has been demonstrated (Stapleton et al 2002;Crawford, Brickley, and Thomas 2007;Chaigneau et al 2013;Kurczyn et al 2013;José et al 2014). An altimeter can see through clouds and mild rain and forms a good substitute for ocean colour and thermal data in tracking mesoscale eddies under cloud cover.…”

Section: Introductionmentioning

confidence: 99%

The influence of mesoscale eddies on a commercial fishery in the coastal waters of the Andaman and Nicobar Islands, India

Asundi

Krishnan

George

et al. 2014

International Journal of Remote Sensing

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Mesoscale eddies enhance the productivity in a stratified coastal environment by upwelling. The seas around the Andaman and Nicobar Islands have been found to have frequent mesoscale eddy activity. Commercial fishing grounds coincide with upwelling areas associated with cyclonic and anticyclonic eddies and also with areas between two adjacent eddies. There are different eddy zones supporting different types of fishing gears and fish. The current study aims at identifying the different zones of mesoscale eddies in the Andaman Sea and compares the productivity and fishing activity in each of them. Data collected from 454 commercial fishing trips in the Andaman Sea along with maps of sea level anomaly and Moderate Resolution Imaging Spectroradiometer (MODIS) global level 3 mapped thermal infrared (IR) daytime sea surface temperature (SST) from the Aqua and Terra satellites were used for the study. Known upwelling areas such as the periphery of anticyclonic and the core of cyclonic eddies showed higher catches in longlines, ring seines among the fishing gears, and among all the fish species groups. Downwelling areas such as the periphery of cyclonic and the core of anticyclonic eddies showed lower catches with ring seines and the fish species groups. Areas in between adjacent eddies were explored in this study and the fish captures in such areas were found to be different with types of fishing and the target fish group. The study shows results that link eddy activity with the performance of a fishery.

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Section: Introductionmentioning

confidence: 99%

The influence of mesoscale eddies on a commercial fishery in the coastal waters of the Andaman and Nicobar Islands, India

Asundi

Krishnan

George

et al. 2014

International Journal of Remote Sensing

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“…The high abundance of heterotrophic prokaryotes measured at the edge of the cyclonic eddy could be explained by the high activity in the microbial loop. This activity can be in part enhanced by a more efficient vertical exchange of seawater masses at the periphery rather than at the centre of the eddy (Stapleton et al, 2002;Klein and Lapeyre, 2009). Similarly, the numerical dominance of Synechococcus, observed only once in the surface samples during the cruise, may be the result of the change in trophic conditions (Girault et al, 2013b).…”

Section: Distribution Of Heterotrophic Prokaryotes and Eddiesmentioning

confidence: 96%

Heterotrophic prokaryote distribution along a 2300 km transect in the North Pacific subtropical gyre during a strong La Niña conditions: relationship between distribution and hydrological conditions

Girault

Arakawa²,

Barani³

et al. 2015

Biogeosciences

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The spatial distribution of heterotrophic prokaryotes was investigated during the Tokyo-Palau cruise in the western part of the North Pacific subtropical gyre (NPSG) along a north-south transect between 33.60 and 13.25 • N. The cruise was conducted in three different hydrological areas identified as the Kuroshio region, the subtropical gyre area and the transition zone. Two eddies were crossed along the transect: one cold-core cyclonic eddy and one warmcore anticyclonic eddy and distributions of the heterotrophic prokaryotes were recorded. By using analytical flow cytometry and a nucleic acid staining protocol, heterotrophic prokaryotes were discriminated into three subgroups depending on their nucleic acid content (low, high and very high nucleic acid contents labelled LNA, HNA and VHNA, respectively). Statistical analyses performed on the data set showed that LNA, mainly associated with low temperature and low salinity, were dominant in all the hydrological regions. In contrast, HNA distribution seemed to be associated with temperature, salinity, Chl a and silicic acid. A latitudinal increase in the HNA / LNA ratio was observed along the north-south transect and was related to higher phosphate and nitrate concentrations. However, the opposite relationship observed for the VHNA / HNA ratio suggested that the link between nucleic acid content and oligotrophic conditions is not linear, underlying the complexity of the biodiversity in the VHNA, HNA and LNA subgroups. In the Kuroshio Current, it is suggested that the high concentration of heterotrophic prokaryotes observed at station 4 was linked to the path of the cold cyclonic eddy core. In contrast, it is thought that low concentrations of heterotrophic prokaryotes in the warm core of the anticyclonic gyre (Sta. 9) are related to the low nutrient concentrations measured in the seawater column. Our results showed that the high variability between the various heterotrophic prokaryote cluster abundances depend both on the mesoscale structures and the oligotrophic gradient.

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How do hydrodynamic instabilities affect 3D transport in geophysical vortices?

Wang

Özgökmen

2015

Ocean Modelling

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The use of radar altimeter data in combination with other satellite sensors for routine monitoring of the ocean: Case study of the northern Arabian Sea and Gulf of Oman

Cited by 5 publications

References 9 publications

The influence of mesoscale eddies on a commercial fishery in the coastal waters of the Andaman and Nicobar Islands, India

The influence of mesoscale eddies on a commercial fishery in the coastal waters of the Andaman and Nicobar Islands, India

Heterotrophic prokaryote distribution along a 2300 km transect in the North Pacific subtropical gyre during a strong La Niña conditions: relationship between distribution and hydrological conditions

How do hydrodynamic instabilities affect 3D transport in geophysical vortices?

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