Deep-sea Research Part Ii-topical Studies in Oceanography
Papers 4745
1 page of 475 pages (4,745 results)
#1Prince PrakashH-Index: 4
#2Satya Prakash (Indian National Centre for Ocean Information Services)H-Index: 16
Last. N. Anil KumarH-Index: 1
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Abstract To better understand the impact of climate change on the Southern Ocean (SO) biogeochemistry, we must know the evolution of the seasonal cycle of biological properties. Here we present the first estimate of the seasonal evolution of chlorophyll-a (Chl-a) along oceanic fronts in the Indian sector of SO using Bio-Argo float observations. The present study is based on data collected using three such floats deployed in the frontal zones. The high productivity is usually attributed to the up...
Abstract Phytoplankton biomass (chlorophyll-a) and community structure in the water column was analyzed across various frontal regions in the Subtropical Front (STF), Sub-Antarctic Front (SAF), Polar Front-1 (PF1) and Polar Front-2 (PF2) in the Indian Ocean sector of the Southern Ocean (SO) during the austral summer (January–February) of 2013 and 2015. The surface chlorophyll-a (Chl-a) was maximum in PF1 (0.77 mg m−3) followed by the SAF (0.5 mg m−3), STF (0.26 mg m−3) and PF2 (0.21 mg m−3) in 2...
#1Hervé Demarcq ('IFREMER': IFREMER)H-Index: 19
#2Margaux NoyonH-Index: 4
Last. Michael J. Roberts (NOC: National Oceanography Centre)H-Index: 5
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Abstract Spatial anomalies associated with seamounts and islands have been detected in the South West Indian Ocean using a new surface chlorophyll-a based enrichment index (EI). Calculated from daily L3 4-km MODIS chl-a data from 2003 to 2018, the EI was used to quantify recurrent (seasonal) surface enrichment associated with these features. Most notable were the shallow Walters Shoal (18 m) and nearby deeper WS-2 seamount (480 m), both located on the southern Madagascar Ridge, which showed high...
3 CitationsSource
#1Patrick Vianello (DST Systems)H-Index: 2
#2Jean-François Ternon ('IFREMER': IFREMER)H-Index: 5
Last. Michael J. Roberts (NOCS: National Oceanography Centre, Southampton)H-Index: 2
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Abstract This work is part of the MADRidge Project special issue which aims to describe pelagic ecosystems in the vicinity of three prominent shallow seamounts in the South West Indian Ocean: one here named MAD-Ridge (240 m below the surface) plus Walters Shoal (18 m) on the Madagascar Ridge, and La Perouse (60 m) on the abyssal plain east of Madagascar. The three span latitudes 20°S and 33°S, some 1500 km. The study provides the background oceanography for the once-off, multidisciplinary snapsh...
#1Pavanee Annasawmy ('IFREMER': IFREMER)H-Index: 4
#2Jean-François Ternon ('IFREMER': IFREMER)H-Index: 5
Last. Francis Marsac ('IFREMER': IFREMER)H-Index: 19
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Abstract An investigation of the vertical and horizontal distributions of micronekton, as influenced by mesoscale eddies, the Madagascar shelf and shallow seamounts, was undertaken using acoustic data collected during two research cruises at an unnamed pinnacle (summit depth ∼240 m) thereafter named “MAD-Ridge”, and at La Perouse seamount (∼60 m) in the south-western Indian Ocean. MAD-Ridge is located to the south of Madagascar, in an “eddy corridor”, known both for its high mesoscale activity a...
7 CitationsSource
#1Phyllis J. Stabeno (PMEL: Pacific Marine Environmental Laboratory)H-Index: 44
#2Ryan M. McCabe (Joint Institute for the Study of the Atmosphere and Ocean)H-Index: 2
Abstract Observations from a single mooring site on the northern Chukchi Sea continental slope near the 1000-m isobath are presented. This site was occupied consecutively for three years (spanning September 2014–August 2017). Vertically the flow divides into three depth ranges, the upper ∼200 m, ∼200–∼850 m and near-bottom flow. In the upper ∼200 m, the mean flow was northwestward and strongest in the summer months. During winter months, currents decreased in magnitude, and in some years even re...
#1Patrick VianelloH-Index: 2
#2Steven Herbette ('IFREMER': IFREMER)H-Index: 5
Last. Michael Roberts (NOCS: National Oceanography Centre, Southampton)H-Index: 18
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Abstract Based on satellite and in situ data, the dynamic characteristics and vertical structure of a surface intensified mesoscale dipole recently expelled from the South East Madagascar Current (SEMC) is described for the first time. The dipole was surveyed 250 nautical miles south of Madagascar between 14 and 23 November 2016, during west-east and south-north transects carried out over the northern Madagascar Ridge. The dipole consisted of two counter-rotating vortices of similar size (100 km...
2 CitationsSource
#1Adam Spear (NOAA: National Oceanic and Atmospheric Administration)H-Index: 3
#2Jeff Napp (NOAA: National Oceanic and Atmospheric Administration)
Last. David G. Kimmel (NOAA: National Oceanic and Atmospheric Administration)H-Index: 19
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Abstract The Chukchi Sea has recently experienced increased water temperatures, increased advection of water from the Bering Sea, declines in sea-ice concentration, and shorter periods of ice coverage. These physical changes are expected to impact trophic food-webs and ecosystem attributes. In this study, a series of research surveys were conducted in the summers of 2011–2015 to characterize the physical environment and its relation to the abundance of large zooplankton. Large zooplankton are ke...
#1Thor A. KlevjerH-Index: 19
#2Webjørn MelleH-Index: 24
Last. Dag L. Aksnes (University of Bergen)H-Index: 37
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Abstract We studied vertical distribution and diel vertical migration (DVM) behaviour of mesopelagic acoustic scattering layers in relation to environmental conditions in the Norwegian Sea, the Iceland Sea, the Irminger Sea, and the Labrador Sea. Distinct mesopelagic scattering layers were found in all basins, but the daytime depth of the layers varied between basins. The results suggested that daytime vertical distribution across the four basins are strongly influenced by optical conditions. DV...
#1Shael A. HarrisH-Index: 1
#2Margaux NoyonH-Index: 4
Last. Michael Roberts (NOCS: National Oceanography Centre, Southampton)H-Index: 18
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Abstract The composition and spatial variability of ichthyoplankton assemblages were investigated at three shallow seamounts between latitudes 19°S and 33°S in the South West Indian Ocean (SWIO) – La Perouse (60 m), an unnamed pinnacle south of Madagascar, referred to hereafter as MAD-Ridge (240 m), and the Walters Shoal seamount (18 m). In all, 299 larvae (23 families, 54 species) were present at La Perouse, 964 larvae (58 families and 127 species) at MAD-Ridge, and 129 larvae (9 families, 24 s...
2 CitationsSource
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