Oceanography of the northern Arabian Sea

Qasim, S. Z.

doi:10.1016/0198-0149(82)90027-9

Cited by 268 publications

(109 citation statements)

References 5 publications

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“…DO slightly decreased from 30 m depth and beyond 75 m decrease was pronounced. The depletion of oxygen in the shelf edge of northern latitude may be associated with the oxygen minimum layer described by Gupta et al, (1976) and Qasim (1982).…”

Section: Discussionmentioning

confidence: 84%

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Jayaraj

Jayalakshmi

Saraladevi

2006

Environ Monit Assess

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Abstract. The paper deals with the standing stock of macrobenthic infauna and associated environmental factors influencing the benthic community in the shelf region of the northwest Indian coast. The data were collected onboard FORV Sagar Sampada during the winter monsoon (January-February, 2003) to understand the community structure and the factors influencing the benthic distribution. The environmental parameters, sediment characteristics and macrobenthic infauna were collected at 26 stations distributed in the depths between 30 and 200 m extending from Mormugao to Porbander. Total benthic abundance was high in lower depths (50-75m), and low values noticed at 30 m depth contour was peculiar. Polychaetes were the dominant group and were more abundant in shallow and middle depths with moderate organic matter, clay and relatively high dissolved oxygen. On the other hand crustaceans and molluscs were more abundant in deeper areas having sandy sediment and low temperature. High richness and diversity of whole benthic groups observed in deeper depths counter balanced the opposite trend shown by polychaete species. Generally benthos preferred medium grain sized texture with low organic matter and high organic matter had an adverse effect especially on filter feeders. Deposit feeding polychaetes dominated in shallow depths while carnivore species in the middle depths.Ecologically, benthos were controlled by a combination of factors such as temperature, salinity, dissolved oxygen, sand and organic matter and no single factor could be considered as an ecological master factor.

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Section: Discussionmentioning

confidence: 84%

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Jayaraj

Jayalakshmi

Saraladevi

2006

Environ Monit Assess

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“…Annual high surface water productivity (between 200 and 400 gC m 32 yr 31 ; Kabanova, 1968;Qasim, 1982;Codispoti, 1991) and moderate rates of thermocline ventilation (You and Tomczak, 1993), result in an intense OMZ between 150 and 1200 m (Wyrtki, 1973;Deuser et al, 1978;Olson et al, 1993). Oxygen concentrations in the OMZ drop to values 6 0.05 ml/l (e.g.…”

Section: Climatic and Oceanographic Settingmentioning

confidence: 99%

Late Quaternary Protoperidinium cysts as indicators of paleoproductivity in the northern Arabian Sea

Reichart

Brinkhuis

2003

Marine Micropaleontology

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The reliability of organic-walled cysts of the heterotrophic dinoflagellate Protoperidinium as paleoproductivity indicators and the influence of bottom water oxygenation on cyst preservation is assessed by using Arabian Sea records of the past V125 kyr as a natural laboratory. Multidisciplinary geochemical, micropaleontological and palynological datasets are integrated to analyze the relationship between Protoperidinium cyst concentrations and other paleoproductivity proxies. Differential preservation potential is quantified in order to establish threshold oxidative degradation values for a possible application of quantitative Protoperidinium cyst records in paleoenvironmental reconstructions. Results indicate that variations in Protoperidinium cyst concentration closely correspond to other marine productivity and/or upwelling proxies. Although oxygenation will lead to significant cyst degradation, and thus decreased concentrations, down-core patterns in Protoperidinium cyst concentration still primarily reflect changes in sea surface productivity. In view of differential preservation among dinoflagellate cysts, down-core variations in relative abundance of Protoperidinium should be treated with caution. ß

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“…The Arabian Sea is one of the key oceanic regions, which because of intense upwelling and associated high levels of biological productivity during summer monsoon [Qasim, 1977[Qasim, , 1982Lal, 1994], can significantly influence the atmospheric CO2 budget [Krishnaswami and Nair, 1996]. A large body of its intermediate water (-200-1000 m) remains suboxic through the year, and there is perennial denitrification [Naqvi, 1991].…”

Section: As a Part Of The Geosecs Expedition •4c Measurementsmentioning

confidence: 99%

Radiocarbon in the Arabian Sea water column: Temporal variations in bomb¹⁴C inventory since the GEOSECS and CO₂air‐sea exchange rates

Bhushan¹,

Somayajulu²,

Chakraborty³

et al. 2000

J. Geophys. Res.

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Oceanography of the northern Arabian Sea

Cited by 268 publications

References 5 publications

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Late Quaternary Protoperidinium cysts as indicators of paleoproductivity in the northern Arabian Sea

Radiocarbon in the Arabian Sea water column: Temporal variations in bomb¹⁴C inventory since the GEOSECS and CO₂air‐sea exchange rates

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Oceanography of the northern Arabian Sea

Cited by 268 publications

References 5 publications

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Influence of environmental properties on macrobenthos in the northwest Indian shelf

Late Quaternary Protoperidinium cysts as indicators of paleoproductivity in the northern Arabian Sea

Radiocarbon in the Arabian Sea water column: Temporal variations in bomb14C inventory since the GEOSECS and CO2air‐sea exchange rates

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Radiocarbon in the Arabian Sea water column: Temporal variations in bomb¹⁴C inventory since the GEOSECS and CO₂air‐sea exchange rates