Citation:

0967-0645(93)90030-Q

Name: Physical oceanography and hydrochemistry measured on water bottle samples during METEOR cruise M10/1
Published: 1993
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

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.

Project(s):

Joint Global Ocean Flux Study (JGOFS)

North Atlantic Bloom Experiment, 1989-1991 (NABE)

Coverage:

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: 5 m * Maximum DEPTH, water: 327 m

Event(s):

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: * Basis: * Method/Device: (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: * Basis: * Method/Device: (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: * Basis: * Method/Device: (CTD-RO) * Comment: max. 200 m

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Date/Time of event	Date/Time
3	Latitude of event	Latitude
4	Longitude of event	Longitude
5	Elevation of event	Elevation	m
6	DEPTH, water	Depth water	m			Geocode
7	Temperature, water	Temp	°C	Podewski, Sigrid	CTD
8	Salinity	Sal		Podewski, Sigrid	CTD
9	Density, sigma-theta (0)	Sigma-theta	kg/m³	Podewski, Sigrid	Calculated
10	Ammonium	[NH4]+	µmol/l	Peinert, Rolf	Colorometric analysis, manual
11	Oxygen	O2	µmol/l	Koeve, Wolfgang	Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91)
12	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Eppley, Richard W	Chemiluminescence (NO2/NO3)
13	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Peinert, Rolf	Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
14	Nitrite	[NO2]-	µmol/l	Peinert, Rolf	Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
15	Phosphate	[PO4]3-	µmol/l	Peinert, Rolf	Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
16	Silicate	Si(OH)4	µmol/l	Peinert, Rolf	Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1)
17	Chlorophyll a	Chl a	µg/l	Boje, Rolf	Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH)
18	Nanoflagellates, heterotrophic	HNF	#/ml	Ullrich, Sören	Epifluorescence microscopy
19	Cyanobacteria	Cyanobact	#/ml	Ullrich, Sören	Epifluorescence microscopy
20	Bacteria	Bact	#/ml	Karrasch, Bernhard	Epifluorescence microscopy
21	Eukaryotes	Euka	#/ml	Zeitzschel, Bernt	Optical microscopy
22	Carbon, organic, particulate	POC	µg/l	Passow, Uta	Carbon/nitrogen analyser (GF/F filtered)
23	Nitrogen, organic, particulate	PON	µg/l	Passow, Uta	Carbon/nitrogen analyser (GF/F filtered)
24	Suspended matter, total	TSS	mg/l	Zeitzschel, Bernt	Gravimetric analysis (GF/F filtered)
25	Primary production of carbon per hour	PP C	mg/m³/h	Jochem, Frank	14C uptake

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3726 data points

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