Siegel, Herbert; Gerth, Monika; Ohde, Thomas; Brust-Möbius, Juliane (2016): Chlorophyll-a and suspended matter concentration, yellow substance absorption at 440 nm and Secchi depth in the Namibian upwelling region during METEOR cruise M103/2 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856903
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Further details:
Doerffer, Roland (2002): Protocols for the Validation of MERIS Water Products, vol No. PO-TN-MEL-GS-0043. ESA publication
Project(s):
Funding:
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03F0650: Geochemistry and ecology of the Namibian upwelling system
Coverage:
Median Latitude: -20.191364 * Median Longitude: 11.835373 * South-bound Latitude: -23.502000 * West-bound Longitude: 10.628000 * North-bound Latitude: -19.360000 * East-bound Longitude: 13.400167
Date/Time Start: 2014-01-26T02:41:00 * Date/Time End: 2014-02-10T14:03:00
Minimum DEPTH, water: 0 m * Maximum DEPTH, water: 5 m
Event(s):
M103/2_81 (81) * Latitude Start: -20.054667 * Longitude Start: 12.705500 * Latitude End: -20.090000 * Longitude End: 12.711000 * Date/Time Start: 2014-01-26T02:41:00 * Date/Time End: 2014-01-26T07:49:00 * Elevation: -121.0 m * Location: off Namibia * Campaign: M103/2 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: CT2_03 (121m)
M103/2_83 (83) * Latitude Start: -20.199667 * Longitude Start: 12.375000 * Latitude End: -20.224500 * Longitude End: 12.387667 * Date/Time Start: 2014-01-26T10:29:00 * Date/Time End: 2014-01-26T17:01:00 * Elevation: -253.0 m * Location: off Namibia * Campaign: M103/2 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: CT2_05 (253m)
M103/2_88 (88) * Latitude Start: -20.516833 * Longitude Start: 11.375833 * Latitude End: -20.515833 * Longitude End: 11.376500 * Date/Time Start: 2014-01-27T15:35:00 * Date/Time End: 2014-01-27T18:42:00 * Elevation: -1178.0 m * Location: off Namibia * Campaign: M103/2 * Basis: Meteor (1986) * Method/Device: CTD/Rosette (CTD-RO) * Comment: CT2_10 (1178m)
Comment:
The chlorophyll-a concentration was measured using the standard method of in vitro fluorescence according to the monitoring programme of HELCOM (Helsinki Commission).
The suspended matter concentration (SPM) was determined according to the ESA validation protocols (Doerffer 2002). Before filtration, the Whatman GFF filters were washed, glowed and weighted. The water samples were filtrated using the pre-treated filters. After filtration, the filters were washed with Milli-Q water, dried at a temperature of 70°C and weighted.
The yellow substance absorption (ay(440 nm)) was determined according to Højerslev, (1980). The water samples were filtrated using Whatman GFF filters. The absorbance of the filtered water was measured with Perkin-Elmer Lambda-2 spectrophotometer. The ay(440nm) value was calculated using the equation ay(440 nm)= 2.303A(440 nm)/l where A is the absorbance and l is the length of the quartz cell in meters.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Siegel, Herbert | |||
| 2 | Date/Time of event | Date/Time | Siegel, Herbert | |||
| 3 | Latitude of event | Latitude | Siegel, Herbert | |||
| 4 | Longitude of event | Longitude | Siegel, Herbert | |||
| 5 | DEPTH, water | Depth water | m | Siegel, Herbert | Geocode | |
| 6 | Chlorophyll a | Chl a | µg/l | Siegel, Herbert | ||
| 7 | Suspended particulate matter | SPM | mg/l | Siegel, Herbert | Determined according to Doerffer (2002) | |
| 8 | Yellow substance absorption, 440 nm | ay 440 nm | 1/m | Siegel, Herbert | Determined according to Hojerslev (1980) | |
| 9 | Depth of Secchi Disk | z(SD) | m | Siegel, Herbert | Secchi disc |
License:
Creative Commons Attribution-NonCommercial 3.0 Unported (CC-BY-NC-3.0)
Size:
73 data points
Data
| 1 Event | 2 Date/Time | 3 Latitude | 4 Longitude | 5 Depth water [m] | 6 Chl a [µg/l] | 7 SPM [mg/l] | 8 ay 440 nm [1/m] | 9 z(SD) [m] |
|---|---|---|---|---|---|---|---|---|
| M103/2_81 | 2014-01-26T02:41 | -20.0547 | 12.7055 | 5 | 3.576 | 4.047 | 0.116 | 5.5 |
| M103/2_83 | 2014-01-26T10:29 | -20.1997 | 12.3750 | 5 | 0.970 | 1.970 | 0.081 | 11.0 |
| M103/2_88 | 2014-01-27T15:35 | -20.5168 | 11.3758 | 5 | 2.150 | 2.490 | 0.125 | 8.5 |
| M103/2_89 | 2014-01-28T01:55 | -20.5620 | 10.9302 | 5 | 0.800 | 2.030 | 0.073 | 13.0 |
| M103/2_104 | 2014-01-29T16:13 | -19.6647 | 12.8063 | 5 | 9.270 | 3.050 | 0.098 | 7.0 |
| M103/2_107 | 2014-01-30T03:40 | -19.7417 | 12.5192 | 5 | 5.230 | 1.960 | 0.122 | 4.5 |
| M103/2_110 | 2014-01-30T14:20 | -19.9268 | 12.2182 | 0 | 2.910 | 2.160 | 0.124 | 5.5 |
| M103/2_114 | 2014-01-31T04:14 | -20.1040 | 11.8203 | 5 | 3.370 | 1.660 | 0.118 | 8.0 |
| M103/2_118 | 2014-02-01T05:22 | -20.2022 | 11.1695 | 5 | 0.880 | 2.070 | 0.067 | 13.0 |
| M103/2_119 | 2014-02-01T16:00 | -20.3285 | 10.7985 | 5 | 0.323 | 0.517 | 0.044 | 13.5 |
| M103/2_120 | 2014-02-02T01:57 | -19.9905 | 10.6355 | 5 | 1.411 | 1.387 | 0.115 | 8.5 |
| M103/2_121 | 2014-02-02T13:43 | -19.8520 | 11.0488 | 5 | 0.889 | 1.380 | 0.085 | 12.0 |
| M103/2_123 | 2014-02-03T03:11 | -19.7512 | 11.3408 | 5 | 0.478 | 4.693 | 0.081 | 11.0 |
| M103/2_127 | 2014-02-04T04:11 | -19.6880 | 11.5665 | 5 | 1.723 | 3.127 | 0.084 | 8.5 |
| M103/2_131 | 2014-02-04T16:31 | -19.5312 | 11.9922 | 5 | 4.603 | 1.900 | 0.172 | 4.0 |
| M103/2_135 | 2014-02-05T09:38 | -19.3720 | 12.3620 | 5 | 4.023 | 2.360 | 0.093 | 7.0 |
| M103/2_144 | 2014-02-07T08:21 | -20.1088 | 11.8110 | 5 | 3.427 | 0.131 | 4.0 | |
| M103/2_146 | 2014-02-08T03:51 | -19.3600 | 11.4797 | 5 | 1.133 | 0.078 | 9.0 | |
| M103/2_148 | 2014-02-10T12:20 | -23.4998 | 13.4002 | 5 | 2.211 | 0.130 | 8.0 |