10.1594/PANGAEA.761662
Vedernikov, Vladimir I
Vladimir I
Vedernikov
Demidov, A B
A B
Demidov
0000-0002-1370-079X
(Table 1) Productive characteristics of phytoplankton and some relevant factors in the North Atlantic in September-October 1991
PANGAEA
1999
Event label
Latitude of event
Longitude of event
Date/Time of event
DEPTH, water
Depth, top/min
Depth, bottom/max
Primary production of carbon
Primary production, integrated
Chlorophyll a
Assimilation rate of carbon per chlorophyll a
Photosynthesis layer, thickness
Depth of Secchi Disk
Radiation, photosynthetically active over a period of a sample exposure
Productivity index
Nitrogen, total dissolved
Phosphorus
Silicon
Temperature, water
Transparent bottle 150L
14C in-situ incubation
Calculated
Spectrophotometry
Secchi disc
Photometry
Gas chromatography
Titration
CTD, Neil Brown
Archive of Ocean Data (ARCOD)
1991-09-07T00:00:00/1991-10-20T00:00:00
en
Supplementary Dataset
432 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
During the study period values of primary production in the water column (C_pc) and average chlorophyll a concentration in the photosynthetic layer along the transect across the North Atlantic Current (NAC) were 140-348 mg C/m**2/day and 0.15-0.47 µg/l, along the transect across the Gulf Stream these values were 201-407 mg C/m**2/day and 0.13-0.24 µg/l; at stations of the sub-latitudinal (21°-28°N) transect across the Atlantic Ocean they were 95-360 mg C/m**2/day and 0.09-0.20 µg/l; and in the region of the Canary upwelling values were 951-1740 mg C/m**2/day and 0.56-5.35 µg/l. Along the transects across NAC and across the Atlantic Ocean the variability of C_pc signifi¬cantly depended on level of incident solar radiation. Transition from sub-arctic high-productive coastal waters to oceanic subtropical waters was accompanied by a downwelling of the main mass of chlo¬rophyll from the upper layers of the photosynthetic zone to its lower layers; this resulted in slower decrease of primary production with depth and in more effective utilization of solar radiation by phytoplankton. The photosynthetic layer at both oceanic and coastal stations was limited by irradiance level about 0.1% of its subsurface PAR values (E_0). In the subtropical waters, a deep chlorophyll maximum was formed at depths 100-120 m at low irradiance (0.4-1.2% E_0) and at nutrient concentrations (NO3 + NO2, PO4, Si) exceeding their very low concentrations in the upper 100 m layer by factor ~1.5.
Supplement to: Vedernikov, Vladimir I; Demidov, A B (1999): Primary production and chlorophyll in the North Atlantic in September-October 1991. Translated from Okeanologiya, 1999, 39(6), 876-886, Oceanology, 39(6), 796-805
-66.75
-17.24000000000001
21.3
53.0
North Atlantic