(Table 2) Production parameters of phytoplankton and some associated parameters in the area of the Titanic Polygon

• Main Authors: Vedernikov, Vladimir I, Gagarin, Vladimir I
• Format: Dataset
• Language: English
• Published: PANGAEA 2003
• Subjects: 14C in-situ incubation; Akademik Mstislav Keldysh; AMK46; AMK46-4190; AMK46-4244; AMK46-4258; AMK46-4282; Archive of Ocean Data; ARCOD; Assimilation rate of carbon per chlorophyll a; Bottle; Niskin 30-L; Calculated; Chlorophyll a; CTD; Neil Brown; Date/Time of event; Depth of Secchi Disk; Elevation of event; Event label; Latitude of event; Longitude of event; NIS_30L; Northwest Atlantic; Photometry; Photosynthesis layer; thickness; Primary production; integrated; Primary production of carbon; Productivity index; Radiation; photosynthetically active over a period of a sample exposure; Secchi disc; Temperature; water; Newfoundland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.763231; https://doi.org/10.1594/PANGAEA.763231

Studies were carried out mostly in the area of RMS Titanic wreck site (41°44'N, 49°57'W) located above the continental slope and the south of the Grand Banks of Newfoundland. In a period from 18.06 to 24.09.2001 five surveys of production characteristics of surface phytoplankton were conducted over 5-9 days. Mean values of these characteristics obtained during the surveys were 9.2-11.7 mg C/m**3 per day for primary production (C_phs), 0.102-0.188 mg/m**3 for chlorophyll a (C_chls), and 4.44-7.42 mg C/mg chl. a per hour for assimilation number (AN). The main reason for low C_phs variability was a significant inverse relationship (R=-0.66) between AN and C_chls found over the research area. When cold shelf waters dominated in the area (27.07 to 19.08.2001), C_chls values for the slope region (0.125+/-0.031 µg/l) and for the outer shelf (0.130+/-0.040 µg/l) were similar. During strengthening of influence of warmer slope waters within area (from 29.08 to 13.09.2001), C_chls concentration within surface waters of the outer shelf was 0.152+/-0.039 µg/l and exceeded one for the slope region (0.094+/-0.004 µg/l) by factor 1.6. Against the background of low Cchls values, the High values of integral primary production in the water column (510-1010 mg C/m**2 per day) at low C_chls values measured within the area were determined both by high assimilation activity of phytoplankton and by the deep (30-40 m) maximum of primary production. Main reasons for formation of such a maximum were high chlorophyll concentration within the layer of the deep chlorophyll maximum (up to 0.5-2.5 µg/l) and in the relatively high solar irradiance within this layer varying from 1.4 to 8.6% of subsurface PAR.