Oelker, Julia; Rixen, Tim; Janßen, Silke; Martin, Bettina; Voß, Daniela; Wollschläger, Jochen (2024): Continuous optical chlorophyll-a and turbidity data along R/V SONNE cruise SO285 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.973135 (DOI registration in progress)
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Abstract:
Underway optical chlorophyll-a and turbidity data were collected along the cruise track with Sea-Bird Scientific ECO FLNTU sensors installed within two autonomous measurement systems, called self-cleaning monitoring boxes (SMBs). The SMBs measure alternatingly. While one box is measuring, the other one is being cleaned. The water inlet for the SMBs is at about 4 m below sea surface. Observed chlorophyll-a and turbidity data were both quality controlled and the chlorophyll-a data was additionally calibrated using chlorophyll-a reference data from discrete water samples taken from the CTD water sampler at 10 m depth. Sample chlorophyll-a was determined spectrophotometrically following Jeffrey and Humphrey (1975) as in EPA Method 446. Note that the ship crossed various biogeochemical provinces leading to high variability in the data and, additionally, non-photochemical quenching effects can be observed making it difficult to robustly calibrate the data. A comparison of the calibrated chlorophyll-a with satellite data using the GlobColour CHL1 and CHL2 products is additionally provided. Details on all quality control steps, the calibration, and the comparison with satellite data can be found in the data processing report. The resulting data set contains the original data, the calibrated data (in case of chlorophyll-a) and corresponding quality flags achieved by the quality control algorithm. The data source is given through the name of the active SMB. The data set contains data during transit time and station work. We recommend to use ship's speed to filter for only transit data.
Related to:
Rixen, Tim; Borowski, Philina; Duncan, Sabrina; Heinatz, Knut; Hirschmann, Sophia; Horton, Matt; Hüge, Fabian; Janssen, Silke; Jordan, Tine; Kaufmann, Manfred; Kremer, Kira; Labis, Emma; Martin, Bettina; Mayer, Bernhard; Meiritz, Luisa Chiara; Paulus, Eva; Pinter, Sina; Plewka, Julia; Reule, Natalie; Rommel, Alix Claire Maria; Schneider, Tabea; Siddiqui, Claire; Springer, Barbara; Stanbro, Kelsey; Stegeman, Hanna; Wallschuss, Sina; Welsch, Andreas; Wenzel, Julia; Witting, Kea; Zankl, Solvin (2021): Trophic Transfer Efficiency in the Benguela Current, Cruise No. SO285, August 20th - November 2nd 2021, Emden (Germany) - Emden (Germany). SONNE-Berichte, Gutachterpanel Forschungsschiffe, SO285, 128 pp, https://doi.org/10.48433/cr_so285
Data processing report:
Oelker, Julia (2024): Continuous optical chlorophyll-A and turbidity data along R/V SONNE cruise SO285 - Data Processing Report. Institute for Chemistry and Biology of the Marine Environment (ICBM), School of Mathematics and Science, Carl von Ossietzky Universität Oldenburg, DAM_DataProcessingReport_SO285.pdf
Documentation:
ACRI-ST; GlobColour Team (2020): GlobColour - Product User Guide. https://www.globcolour.info/CDR_Docs/GlobCOLOUR_PUG.pdf
Arar, E J (1997): Method 446.0: In Vitro Determination of Chlorophylls a, b, c + c and Pheopigments in 1 2Marine And Freshwater Algae by Visible Spectrophotometry. U.S. Environmental Protection Agency, Washington, DC, https://cfpub.epa.gov/si/si_public_record_report.cfm?Lab=NERL&dirEntryId=309415 (M446_0.PDF)
Project(s):
DAM Underway Research Data (DAM_Underway)
Coverage:
Median Latitude: -1.861851 * Median Longitude: -1.371652 * South-bound Latitude: -33.914540 * West-bound Longitude: -26.768030 * North-bound Latitude: 53.809650 * East-bound Longitude: 18.448890
Date/Time Start: 2021-08-20T09:00:00 * Date/Time End: 2021-11-01T11:10:00
Minimum DEPTH, water: 4.0 m * Maximum DEPTH, water: 4.0 m
Event(s):
SO285_0_Underway-6 * Latitude Start: 53.408300 * Longitude Start: 6.944420 * Latitude End: 53.338600 * Longitude End: 7.200890 * Date/Time Start: 2021-08-20T09:00:00 * Date/Time End: 2021-11-01T11:10:00 * Campaign: SO285 (TRAFFIC) * Basis: Sonne_2 * Method/Device: Fluorometer, Sea-Bird Scientific, ECO FLNTU * Comment: event was not logged in DSHIP
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 2 (ProcLevel2)
Size:
679677 data points
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