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Koeve, Wolfgang; Eppley, Richard W; Podewski, Sigrid; Zeitzschel, Bernt (1993): Physical oceanography and hydrochemistry measured on water bottle samples during METEOR cruise M10/1. PANGAEA,, Supplement to: Koeve, W et al. (1993): An unexpected nitrate distribution in the tropical North Atlantic at 18°N, 30°W - implications for new production. Deep Sea Research Part II: Topical Studies in Oceanography, 40(1-2), 521-536,

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During a R.V. Meteor JGOFS-NABE cruise to a tropical site in the northeast Atlantic in spring 1989, three different vertical regimes with respect to nitrate distribution and availability within the euphotic zone were observed. Besides dramatic variations in the depth of the nitracline, a previously undescribed nose-like nitrate maximum within the euphotic zone was the most prominent feature during this study. Both the vertical structure of phytoplankton biomass and the degree of absolute and relative new production were related to the depth of the nitracline, which in turn was dependent on the occurrence/non-occurrence of the subsurface subtropical salinity maximum (Smax). The mesoscale variability of the nitracline depth, as indicated from a pre-survey grid, and published data on the frequent occurrence of the Smax in tropical waters suggest higher variability of new production and F-ratio than usually expected for oligotrophic oceans. The importance of salt fingering and double diffusion for nitrate transport into the euphotic zone is discussed.
North Atlantic Bloom Experiment, 1989-1991 (NABE)
Median Latitude: 26.634722 * Median Longitude: -25.303767 * South-bound Latitude: 18.308300 * West-bound Longitude: -30.655000 * North-bound Latitude: 35.100000 * East-bound Longitude: -20.870000
Date/Time Start: 1989-03-26T16:46:00 * Date/Time End: 1989-04-26T08:10:00
Minimum DEPTH, water: m * Maximum DEPTH, water: 327 m
M10/1-CTD-239_045 * Latitude: 18.308300 * Longitude: -29.586700 * Date/Time Start: 1989-03-26T16:46:00 * Date/Time End: 1989-03-26T17:10:00 * Campaign: M10/1 * Basis: Meteor (1986) * Device: CTD/Rosette (CTD-RO)
M10/1-CTD-241_047 * Latitude: 18.335000 * Longitude: -29.626700 * Date/Time Start: 1989-03-27T07:21:00 * Date/Time End: 1989-03-27T07:56:00 * Campaign: M10/1 * Basis: Meteor (1986) * Device: CTD/Rosette (CTD-RO)
M10/1-CTD-242_048 * Latitude: 18.360000 * Longitude: -29.638300 * Date/Time Start: 1989-03-27T13:19:00 * Date/Time End: 1989-03-27T13:39:00 * Campaign: M10/1 * Basis: Meteor (1986) * Device: CTD/Rosette (CTD-RO) * Comment: max. 200 m
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Date/Time of eventDate/Time
3Latitude of eventLatitude
4Longitude of eventLongitude
5Elevation of eventElevationm
6DEPTH, waterDepth watermGeocode
7Temperature, waterTemp°CPodewski, SigridCTD
8SalinitySalPodewski, SigridCTD
9Density, sigma-theta (0)Sigma-thetakg/m3Podewski, SigridCalculated
10Ammonium[NH4]+µmol/lPeinert, RolfColorometric analysis, manual
11OxygenO2µmol/lKoeve, WolfgangOxygen, Winkler (Culberson, 1991, WOCE Report 68/91)
12Nitrate and Nitrite[NO3]- + [NO2]-µmol/lEppley, Richard WChemiluminescence (NO2/NO3)
13Nitrate and Nitrite[NO3]- + [NO2]-µmol/lPeinert, RolfContinuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
14Nitrite[NO2]-µmol/lPeinert, RolfContinuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
15Phosphate[PO4]3-µmol/lPeinert, RolfContinuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
16SilicateSi(OH)4µmol/lPeinert, RolfContinuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
17Chlorophyll aChl aµg/lBoje, RolfChlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH)
18Nanoflagellates, heterotrophicHNF#/mlUllrich, SörenEpifluorescence microscopy
19CyanobacteriaCyanobact#/mlUllrich, SörenEpifluorescence microscopy
20BacteriaBact#/mlKarrasch, BernhardEpifluorescence microscopy
21EukaryotesEuka#/mlZeitzschel, BerntOptical microscopy
22Carbon, organic, particulatePOCµg/lPassow, UtaCarbon/nitrogen analyser (GF/F filtered)
23Nitrogen, organic, particulatePONµg/lPassow, UtaCarbon/nitrogen analyser (GF/F filtered)
24Suspended matter, totalTSSmg/lZeitzschel, BerntGravimetric analysis (GF/F filtered)
25Primary production of carbon per hourPP Cmg/m3/hJochem, Frank14C uptake
3726 data points

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