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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1999
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.761662 |
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| _version_ | 1867170914294038528 |
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| author | Vedernikov, Vladimir I Demidov, A B |
| author_facet | Vedernikov, Vladimir I Demidov, A B |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_761662 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Productive characteristics of phytoplankton and some relevant factors in the North Atlantic in September-October 1991 Vedernikov, Vladimir I Demidov, A B 14C in-situ incubation; Archive of Ocean Data; ARCOD; Assimilation rate of carbon per chlorophyll a; Calculated; Chlorophyll a; CTD, Neil Brown; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Depth of Secchi Disk; Event label; Gas chromatography; Latitude of event; Longitude of event; Nitrogen, total dissolved; North Atlantic Ocean; Phosphorus; 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; Silicon; Spectrophotometry; Temperature, water; Titration; TRANS150; Transparent bottle 150L; Vy23-3578; Vy23-3579; Vy23-3580; Vy23-3584; Vy23-3585; Vy23-3586; Vy23-3587; Vy23-3588; Vy23-3589; Vy23-3591; Vy23-3592; Vy23-3593; Vy23-3594; Vy23-3595; Vy23-3597; Vy23-3600; Vy23-3601; Vy23-3603; Vy23-3604; Vy23-3605; Vy23-3606; Vy23-3607; Vy23-3608; Vy23-3609 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. |
| title | (Table 1) Productive characteristics of phytoplankton and some relevant factors in the North Atlantic in September-October 1991 |
| topic | 14C in-situ incubation; Archive of Ocean Data; ARCOD; Assimilation rate of carbon per chlorophyll a; Calculated; Chlorophyll a; CTD, Neil Brown; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Depth of Secchi Disk; Event label; Gas chromatography; Latitude of event; Longitude of event; Nitrogen, total dissolved; North Atlantic Ocean; Phosphorus; 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; Silicon; Spectrophotometry; Temperature, water; Titration; TRANS150; Transparent bottle 150L; Vy23-3578; Vy23-3579; Vy23-3580; Vy23-3584; Vy23-3585; Vy23-3586; Vy23-3587; Vy23-3588; Vy23-3589; Vy23-3591; Vy23-3592; Vy23-3593; Vy23-3594; Vy23-3595; Vy23-3597; Vy23-3600; Vy23-3601; Vy23-3603; Vy23-3604; Vy23-3605; Vy23-3606; Vy23-3607; Vy23-3608; Vy23-3609 |
| url | https://doi.org/10.1594/PANGAEA.761662 |