Henkel, Rohan; Braun, Axel; Mascarenhas, Veloisa J; Pieck, Daniela; Voß, Daniela; Zielinski, Oliver (2025): Optical water quality variables (Secchi depth and Forel-Ule color indexes) observed during RV MARIA S. MERIAN cruise MSM65 (2017-06-25 – 2017-07-19, GREENHAB II) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.982232 (DOI registration in progress)
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Published: 2025-05-06
Abstract:
Water clarity and color were observed during the cruise MSM65 (GREENHAB II, 2017-06-25 – 2017-07-19) with RV MARIA S MERIAN from St. John's, Canada to Nuuk, Greenland using a white Secchi disc with a diameter of 40 cm and a Forel-Ule color scale. The Secchi depth (SD) was recorded as a relative measure of water clarity at each in situ station during day time. At half SD the apparent color of the water above the submerged Secchi disc was determined using the Forel-Ule color scale. A Forel-Ule color scale is a classic tools used to differentiate the percieved color of water based on a scale from 1 (indigo blue) to 21 (cola brown). The measurements were conducted as recommend in literature (Garaba and Zielinski, 2015; Wernand, 2011; Wernand and van der Woerd, 2010).
Keyword(s):
Related to:
Zielinski, Oliver; Anderson, Donald M; Braun, Axel; Cembella, Allan; D'Entremont, Nicole; Donnelly, Jeffrey P; Fischer, Alexis D; Henkel, Rohan; Koch, Boris P; Krieger, E; Krock, Bernd; Leefmann, Tim; Mascarenhas, Veloisa J; Meier, Daniela; Müller, Annegret; Pieck, Martin; Rhein, Monika; Rieger, Niclas; Siddall, Greg; Sültenfuß, Jürgen; Tillmann, Urban; Tillmann, Anette; Trefault, Nicole; Vásquez, Mónica; Voß, Daniela; Wallace, Douglas WR (2017): Do harmful algae have a northern limit? Cruise No. MSM65 25.06.2017 - 19.07.2017, St John's (Canada) - Nuuk (Greenland), GREENHAB II. MARIA S. MERIAN-Berichte, Gutachterpanel Forschungsschiffe, MSM65, 61 pp, https://doi.org/10.2312/cr_msm65
References:
Garaba, Shungudzemwoyo Pascal; Zielinski, Oliver (2015): An assessment of water quality monitoring tools in an estuarine system. Remote Sensing Applications: Society and Environment, 2, 1-10, https://doi.org/10.1016/j.rsase.2015.09.001
Wernand, Marcel Robert (2011): Poseidon's paintbox : historical archives of ocean colour in global-change perspective [dissertation]. Utrecht University, 240, https://dspace.library.uu.nl/handle/1874/212589
Wernand, Marcel Robert; van der Woerd, Hendrik J (2010): Spectral analysis of the Forel-Ule ocean colour comparator scale. Journal of the European Optical Society-Rapid Publications, 5, 10014s, https://doi.org/10.2971/jeos.2010.10014s
Funding:
German Research Foundation (DFG), grant/award no. 273739224: Priority Programme 1889 Regional Sea Level Change and Society
Ministry for Science and Culture of Lower Saxony (MWK), grant/award no. VWZN3175: Coastal ocean darkening – Light availability in the past and future marine environment
Coverage:
Median Latitude: 67.847867 * Median Longitude: -53.313374 * South-bound Latitude: 56.791848 * West-bound Longitude: -59.290200 * North-bound Latitude: 75.000552 * East-bound Longitude: -50.236202
Date/Time Start: 2017-06-27T16:07:59 * Date/Time End: 2017-07-17T16:54:10
Minimum Elevation: -3541.0 m * Maximum Elevation: -47.3 m
Event(s):
MSM65_1-2 * Latitude: 56.791850 * Longitude: -52.206810 * Date/Time: 2017-06-27T16:07:00 * Elevation: -3541.0 m * Location: Labrador Sea * Campaign: MSM65 (GREENHAB II) * Basis: Maria S. Merian * Method/Device: Secchi disk (SD)
MSM65_11-4 * Latitude: 64.163790 * Longitude: -51.452670 * Date/Time: 2017-06-30T11:15:00 * Elevation: -148.0 m * Location: Davis Strait * Campaign: MSM65 (GREENHAB II) * Basis: Maria S. Merian * Method/Device: Secchi disk (SD)
MSM65_12-5 * Latitude: 64.175000 * Longitude: -51.529410 * Date/Time: 2017-06-30T15:57:00 * Elevation: -114.0 m * Location: Davis Strait * Campaign: MSM65 (GREENHAB II) * Basis: Maria S. Merian * Method/Device: Secchi disk (SD)
Comment:
Chief Scientist of MSM65: Prof. Dr. Oliver Zielinski,Institute for Chemistry and Biology of the Marine Environment
Financial support was kindly provided by the Deutsche Forschungsgemeinschaft (DFG), Senatskommission Ozeanographie (MerMet 15-85 Zielinski). Additional financial support was provided through funding from AWI (PACES program), WHOI and ICBM.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Henkel, Rohan | |||
| 2 | DATE/TIME | Date/Time | Henkel, Rohan | Geocode | ||
| 3 | LATITUDE | Latitude | Henkel, Rohan | Geocode | ||
| 4 | LONGITUDE | Longitude | Henkel, Rohan | Geocode | ||
| 5 | Depth, bathymetric | Bathy depth | m | Henkel, Rohan | ||
| 6 | Depth of Secchi Disk | z(SD) | m | Henkel, Rohan | Secchi disk (SD) | |
| 7 | Forel-Ule index | FUI | # | Henkel, Rohan | Forel-Ule scale |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
117 data points