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

2006 ◽  
Vol 63 (1-2) ◽  
pp. 20-34 ◽  
Author(s):  
N. Anilkumar ◽  
Alvarinho J. Luis ◽  
Y.K. Somayajulu ◽  
V. Ramesh Babu ◽  
M.K. Dash ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Heat Content ◽  
Austral Summer ◽  
Water Masses ◽  
Indian Sector

Meridional variations in N* and Si* along 57°30′E and 47°E transects in the indian sector of the Southern Ocean during austral summer 2011

2020 ◽  
Vol 178 ◽  
pp. 104846 ◽  
Author(s):  
Bhaskar V. Parli ◽  
Deepti R.G. Dessai ◽  
N. Anilkumar ◽  
Racheal Chacko ◽  
Sini Pavithran
Keyword(s):  
Southern Ocean ◽  
Austral Summer ◽  
Indian Sector

scholarly journals Winter Biogeochemical Cycling of Dissolved and Particulate Cadmium in the Indian Sector of the Southern Ocean (GEOTRACES GIpr07 Transect)

2021 ◽  
Vol 8 ◽  
Author(s):  
Ryan Cloete ◽  
Jean C. Loock ◽  
Natasha R. van Horsten ◽  
Susanne Fietz ◽  
Thato N. Mtshali ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Biogeochemical Cycling ◽  
Polar Front ◽  
Water Masses ◽  
Antarctic Polar Front ◽  
Intermediate Water ◽  
Subtropical Zone ◽  
Near Surface ◽  
The Antarctic ◽  
Indian Sector

Winter distributions of dissolved cadmium (dCd) and particulate cadmium (pCd) were measured for the first time in the Indian sector of the Southern Ocean thereby contributing a unique spatial and seasonal dataset. Seven depth profiles, between 41°S and 58°S, were collected along the 30°E longitude during the 2017 austral winter to investigate the biogeochemical cycling of cadmium during a period characterized by contrasting upper water column dynamics compared to summer. Our results support an important role for biological uptake during winter months albeit weaker compared to summer. Distinct, biologically driven changes in cadmium cycling across the transect were observed. For example, surface ratios of pCd to phosphorus (P; pCd:P) increased from 0.37 to 1.07 mmol mol–1 between the subtropical zone (STZ) and the Antarctic zone (AAZ) reflecting increased Cd requirements for diatoms at higher latitudes which, in turn, was driven by a complex relationship between the availability of dCd and dissolved iron (dFe), zinc (dZn) and manganese (dMn). Vertical profiles of pCd:P displayed near-surface maxima consistent with (1) P occurring in two phases with different labilities and the lability of Cd being somewhere in-between and (2) increasing dCd to phosphate (PO4; dCd:PO4) ratios with depth at each station. North of the Antarctic Polar Front (APF), a secondary, deeper pCd:P maximum may reflect an advective signal associated with northward subducting Antarctic Intermediate Water (AAIW). The strong southward increase in surface dCd and dCd:PO4, from approximately 10–700 pmol kg–1 and 40–400 μmol mol–1, respectively, reflected the net effect of preferential uptake and regeneration of diatoms with high Cd content and the upwelling of Cd enriched water masses in the AAZ. Furthermore, distinct dCd versus PO4 relationships were observed in each of the intermediate and deep water masses suggesting that dCd and PO4 distributions at depth are largely the result of physical water mass mixing.

scholarly journals SEA SURFACE pCO2IN THE INDIAN SECTOR OF THE SOUTHERN OCEAN DURING AUSTRAL SUMMER OF 2009

2012 ◽  
pp. 79-92
Author(s):  
SUHAS SHETYE ◽  
MARUTHADU SUDHAKAR ◽  
RENGASWAMY RAMESH ◽  
RAHUL MOHAN ◽  
SHRAMIK PATIL ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Austral Summer ◽  
Sea Surface ◽  
Indian Sector

Variability in primary productivity and bio-optical properties in the Indian sector of the Southern Ocean during an austral summer

Polar Biology ◽  
2020 ◽  
Vol 43 (10) ◽  
pp. 1469-1492
Author(s):  
Anvita U. Kerkar ◽  
S. C. Tripathy ◽  
P. Minu ◽  
N. Baranval ◽  
P. Sabu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Southern Ocean ◽  
Primary Productivity ◽  
Austral Summer ◽  
Indian Sector

scholarly journals Variations of net primary productivity and phytoplankton community composition in the Indian sector of the Southern Ocean as estimated from ocean color remote sensing data

2012 ◽  
Vol 9 (10) ◽  
pp. 3875-3890 ◽  
Author(s):  
S. Takao ◽  
T. Hirawake ◽  
S. W. Wright ◽  
K. Suzuki
Keyword(s):  
Southern Ocean ◽  
Community Composition ◽  
Primary Productivity ◽  
Phytoplankton Community ◽  
Net Primary Productivity ◽  
Austral Summer ◽  
Remote Sensing Data ◽  
The Past ◽  
Phytoplankton Community Composition ◽  
Indian Sector

Abstract. Phytoplankton population dynamics play an important role in biogeochemical cycles in the Southern Ocean during austral summer. Recent environmental changes such as a rise in sea surface temperature (SST) are likely to impact on net primary productivity (NPP) and phytoplankton community composition. However, their spatiotemporal relationships are still unclear in the Southern Ocean. Here we assessed the relationships between NPP, dominant phytoplankton groups, and SST in the Indian sector of the Southern Ocean over the past decade (1997–2007) using satellite remote sensing data. As a result, we found a statistically significant reduction in NPP in the polar frontal zone over the past decade during austral summer. Moreover, the decrease in NPP positively correlated with the dominance of diatoms (Kendall's rank correlation τ = 0.60) estimated by a phytoplankton community composition model, but not correlated with SST. In the seasonal ice zone, NPP correlated with not only the dominance of diatoms positively (τ = 0.56), but also the dominance of haptophytes (τ = −0.54) and SST (τ = −0.54) negatively. Our results suggested that summer NPP values were strongly affected by the phytoplankton community composition in the Indian sector of the Southern Ocean.

Morphological variability of Emiliania huxleyi in the Indian sector of the Southern Ocean during the austral summer of 2010

2014 ◽  
Vol 107 ◽  
pp. 44-58 ◽  
Author(s):  
Shramik M. Patil ◽  
Rahul Mohan ◽  
Suhas Shetye ◽  
Sahina Gazi ◽  
Syed Jafar
Keyword(s):  
Southern Ocean ◽  
Morphological Variability ◽  
Austral Summer ◽  
Emiliania Huxleyi ◽  
Indian Sector

Nutrient dynamics at the juncture of Agulhas Return Front and subtropical front in the Indian sector of the Southern Ocean during the austral summer

Polar Science ◽  
2020 ◽  
Vol 25 ◽  
pp. 100551 ◽  
Author(s):  
Melena A. Soares ◽  
P. Sabu ◽  
J.V. George ◽  
R.K. Naik ◽  
N. Anilkumar ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Nutrient Dynamics ◽  
Austral Summer ◽  
Subtropical Front ◽  
Indian Sector

scholarly journals Planktonic food web structure at SSTF and PF in the Indian sector of the Southern Ocean during austral summer 2011

2018 ◽  
Vol 37 (1) ◽  
pp. 1495545 ◽  
Author(s):  
H.U.K. Pillai ◽  
N. Anilkumar ◽  
C.T. Achuthankutty ◽  
C.R. Mendes ◽  
P. Sabu ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Food Web ◽  
Austral Summer ◽  
Food Web Structure ◽  
Planktonic Food ◽  
Web Structure ◽  
Indian Sector
Sign in / Sign up

Export Citation Format

Share Document