Fronts, water masses and heat content variability in the Western Indian sector of the Southern Ocean during austral summer 2004

Anilkumar, N.; Luis, Alvarinho J.; Somayajulu, Y.K.; Babu, V. Ramesh; Dash, Mihir Kumar; Pednekar, S.M.; Babu, K. Narendra; Sudhakar, M.; Pandey, P. C.

doi:10.1016/j.jmarsys.2006.04.009

Cited by 55 publications

(33 citation statements)

References 36 publications

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“…The subantarctic surface water is often located near the southern boundary of the subantarctic frontal zone and is characterized by lower temperature (9°C) and salinity (< 34.0) (Park et al, 1993). During this study, colder and fresher (SST and SSS is < 5°C and < 34.0, respectively) water was encountered while approaching the PF region from the subtropics, implying the presence of Antarctic surface water (Anilkumar et al, 2006.…”

Section: Hydrography and Nutrients Variabilitymentioning

confidence: 66%

Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer

et al. 2017

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This study reports the nitrogen uptake rate (using 15 N tracer) of phytoplankton in surface waters of different frontal zones in the Indian sector of the Southern Ocean (SO) during austral summer of 2013. The investigated area encompasses four major frontal systems, i.e., the subtropical front (STF), subantarctic front (SAF), polar front-1 (PF1) and polar front-2 (PF2). Southward decrease of surface water temperature was observed, whereas surface salinity did not show any significant trend. Nutrient (NO 3 -and SiO 4 4-) concentrations increased southward from STF to PF; while ammonium (NH 4 + ), nitrite (NO 2 -) and phosphate (PO 4 3-) remained comparatively stable. Analysis of nutrient ratios indicated potential N-limited conditions at the STF and SAF but no such scenario was observed for PF. In terms of phytoplankton biomass, PF1 was found to be the most productive followed by SAF, whereas PF2 was the least productive region. Nitrate uptake rate increased with increasing latitude, as no systematic spatial variation was discerned for NH 4 + and urea (CO(NH 2 ) 2 ). Linear relationship between nitrate and total N-uptake reveals that the studied area is capable of exporting up to 60% of the total production to the deep ocean if the environmental settings are favorable. Like N-uptake rates the f-ratio also increased towards PF region indicating comparatively higher new production in the PF than in the subtropics. The moderately high average f-ratio (0.53) indicates potentially near equal contributions by new production and regenerated production to the total productivity in the study area. Elevation in N-uptake rates with declining temperature suggests that the SO with its vast quantity of cool water could play an important role in drawing down the atmospheric CO 2 through the "solubility pump".

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Section: Hydrography and Nutrients Variabilitymentioning

confidence: 66%

Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer

et al. 2017

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“…1) includes the STF, which is one of the major oceanic fronts of the SO and acts as the northernmost extent of Subantarctic waters by separating Subantarctic waters in the south from Subtropical waters in the north (Tomczak and Godfrey, 1994). The front is typified by a sharp gradient in temperature and salinity (Orsi et al, 1995;Sokolov and Rintoul, 2002;Anilkumar et al, 2006), and usually exhibits elevated phytoplankton biomass (Sullivan et al, 1993;Weeks and Shillington, 1994;Froneman et al, 1997). The PF also plays an important role in biological production and acts as an important biogeochemical divider in the SO (Kemp et al, 2010).…”

Section: Study Area Sampling and Hydrographymentioning

confidence: 99%

Deep chlorophyll maximum and primary productivity in Indian Ocean sector of the Southern Ocean: Case study in the Subtropical and Polar Front during austral summer 2011

Tripathy

Pavithran

Sabu

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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“…Also in this section, signatures of Upper Circumpolar Deep Water (UCDW) were also observed with temperature range of 1-2 1C and salinity range of 34.7-34.9. The centre of the ACE was characterized by high temperature and salinity of 16 1C and 35.4, respectively, showing the presence of STSW (Anilkumar et al, 2006). The ACE was identified as originated from the northern side of the STF and hence the STSW observed inside the eddy was the water trapped in its formation region.…”

Section: Anticyclonic Eddy (Ace)mentioning

confidence: 99%

Observations of watermass modification by mesoscale eddies in the subtropical frontal region of the Indian ocean sector of southern ocean

Sabu

George

Anilkumar

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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Fronts, water masses and heat content variability in the Western Indian sector of the Southern Ocean during austral summer 2004

Cited by 55 publications

References 36 publications

Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer

Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer

Deep chlorophyll maximum and primary productivity in Indian Ocean sector of the Southern Ocean: Case study in the Subtropical and Polar Front during austral summer 2011

Observations of watermass modification by mesoscale eddies in the subtropical frontal region of the Indian ocean sector of southern ocean

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