Variability of nutrient and thermal structure in surface waters between New Zealand and Antarctica, October 2004–January 2005

Polar research

Serena Massolo¹  Paola Rivaro¹  Elio Paschini²  Antonio Artegiani²  Alessandra Campanelli²  Federica Grilli²  Mauro Marini³  Stanley S. Jacobs⁴ 

[1] Department of Chemistry and Industrial Chemistry, University of Genoa Via Dodecaneso31, IT-16146 Genoa Italy;Institute of Marine Sciences, National Research Council (CNR), Largo Fiera della Pesca 2, IT-60125Ancona Italy;Institute of Marine Sciences, National Research Council (CNR), Largo Fiera della Pesca 2, IT-60125Ancona Italy Correspondence;Lamont-Doherty Earth Observatory of Columbia University , Palisades, NY, 10964, USA

关键词: Southern Ocean;    nutrients;    silica belt;    Antarctic Circumpolar Current;    expendable bathythermograph.;   

DOI  :  10.3402/polar.v30i0.7064

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

We describe the upper ocean thermal structure and surface nutrient concentrations between New Zealand and Antarctica along five transects that cross the Subantarctic Front, the Polar Front (PF) and the southern Antarctic Circumpolar Current (ACC) front. The surface water thermal structure is coupled with variations in surface nutrient concentrations, making water masses identifiable by both temperature and nutrient ranges. In particular, a strong latitudinal gradient in orthosilicate concentration is centred at the PF. On the earlier sections that extend south-west from the Campbell Plateau, orthosilicate increases sharply southward from 10–15 to 50–55 µmol l−1 between 58° S and 60° S, while surface temperature drops from 7°C to 2°C. Nitrate increases more regularly toward the south, with concentrations ranging from 10–12 µmol l−1 at 54° S to 25–30 µmol l−1 at 66° S. The same features are observed during the later transects between New Zealand and the Ross Sea, but the sharp silica and surface temperature...

【 授权许可】

CC BY-NC