ATP, chlorophyll a, and size structure of phytoplankton in seawater at stations in the Atlantic sector of the Southern Ocean

• Main Author: Lopukhin, A S
• Format: Dataset
• Language: English
• Published: PANGAEA 1993
• Subjects: Archive of Ocean Data; ARCOD; DM43; DM43-4080W; DM43-4082W; DM43-4083W; DM43-4084W; DM43-4099W; DM43-4100W; DM43-4102W; DM43-4103W; DM43-4104W; DM43-4105W; DM43-4107W; Dmitry Mendeleev; Southern Ocean; Water sample; WS; Indian; Weddell; Weddell Sea
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.759507; https://doi.org/10.1594/PANGAEA.759507

Chlorophyll "a" and adenozine triphosphate (ATP) concentrations together with size structure of microplankton were investigated in January-April 1989 in the Indian Ocean and in the Weddell Sea. ATP values varied from 11 to 92 ng/l, and chlorophyll "a" concentrations varied from 0.04 to 0.27 µg/l in the Indian Ocean, with prevailing nanoplankton and picoplankton fractions. Both ATP and chlorophyll "a" concentrations increased 2 times to the south of 40°S; in the Weddell Sea they exceeded 400 ng/l and 0.6 µg/l, respectively. Cells of nanophytoplankton and microphytoplankton (mainly diatoms) prevailed in size spectra. Spatial variabilities of the parameters were within one order of magnitude; their values decreased 3-4 times during 1 month. Size structure changed due to increased portion of nanoplankton and picolankton. ATP concentrations in the photic layer (0-200 m) varied from 31.96 mg/m**2 in February to 8.02 mg/m**2 in March to April. ATP concentrations were 61.5 and 98.8 mg/m**2 at depths of 4200 and 4700 m, respectively.