Pieck, Daniela; Voß, Daniela; Schulz, Anne-Christin; Zielinski, Oliver (2025): Reference measurements of surface waters and optical water quality variables (Secchi depth and Forel-Ule color indexes) collected during two RV Otzum cruises along the river Elbe in 2012 and 2013 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.985197
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Published: 2025-10-10 • DOI registered: 2025-11-08
Abstract:
Reference measurements of surface waters were collected during two RV Otzum cruises along the river Elbe in 2012 and 2013 (Ot2012_05: 21.-24.05.; Ot2013_05: 27.-30.05.2013). Temperature [°C], salinity, turbidity [NTU], and chlorophyll from fluorescence [µg/L] were measured by a PocketFerrybox System (values given to the time of sampling). Water samples were taken from the outlet of the system. Suspended particular matter (SPM) and chlorophyll a (Chl a) were filtered onboard on glas fibre filters (GFF, 47mm, 0,7 µm) and frozen at -25°C and -80°C immediately after sampling. Values were determined in the lab after the cruise within 2 months, for SPM via gravimetric analysis (IOCC recommendations) and for Chl a according to EPA Method 445. Water clarity and color were observed using a white Secchi disc with a diameter of 30 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 tool 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 recommended in literature (Garaba and Zielinski, 2015; Wernand, 2011; Wernand and van der Woerd, 2010). Measurements were part of the project DOMsense (01.11.2011 - 31.05.2014, KF2866501DF1)
Keyword(s):
References:
Arar, E J; Collins, G B (1997): Method 445.0 In Vitro Determination of Chlorophyll a and Pheophytin ain Marine and Freshwater Algae by Fluorescence. U.S. Environmental Protection Agency, Washington, DC, 1997, https://cfpub.epa.gov/si/si_public_record_report.cfm?Lab=NERL&dirEntryId=309417 (M445_0.PDF)
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
IOCCG (2021): Ocean Optics and Biogeochemistry Protocols for Satellite Ocean Colour Sensor Validation, Volume 6.0: Particulate Organic Matter Sampling and Measurement Protocols: Consensus Towards Future Ocean Color Missions (eds Joaquín E. Chaves, Ivona Cetinić, Giorgio Dall'Olmo, Meg Estapa, Wilford Gardner, Miguel Goñi, Jason R. Graff, Peter Hernes, Phoebe J. Lam, Zhanfei Liu, Michael W. Lomas, Antonio Mannino, Michael G. Novak, Robert Turnewitsch, P. Jeremy Werdell, Toby K. Westberry). International Ocean-Colour Coordinating Group (IOCCG) Protocol Series, Darthmouth, NS, Canada, 6.0, 54 pp, https://doi.org/10.25607/OBP-1646
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
Additional metadata:
O2A Registry: Metadata for ferrybox PocketFerryBox 751502 at current version. Alfred Wegener Institut Helmholtz Centre for Polar and Marine Research, hdl:10013/registry.9b4b1111-659c-4ba3-b570-b8bf9fb1ed3e
Funding:
Bundesministerium für Wirtschaft und Energie (BMWi), grant/award no. KF2866501DF1: DOMsense (01.11.2011 - 31.05.2014): Entwicklung einer online-Methode zur Bestimmung und Charakterisierung der gelösten organischen Substanz (DOM – gemessen als DOC oder BSB5) von Trink-, Oberflächen- und Abwasser mittels Fluoreszenzspektroskopie
Coverage:
Median Latitude: 53.761057 * Median Longitude: 9.215757 * South-bound Latitude: 53.398000 * West-bound Longitude: 8.222300 * North-bound Latitude: 53.987900 * East-bound Longitude: 10.320700
Date/Time Start: 2012-05-22T11:35:00 * Date/Time End: 2013-05-29T13:01:00
Minimum DEPTH, water: 1 m * Maximum DEPTH, water: 1 m
Event(s):
Ot2012_5-1 * Latitude: 53.986500 * Longitude: 8.319400 * Date/Time: 2012-05-22T11:35:00 * O2A Registry URI: hdl:10013/registry.9b4b1111-659c-4ba3-b570-b8bf9fb1ed3e * Location: Elbe river * Campaign: Ot2012_05 * Basis: Otzum * Method/Device: PocketFerryBox, 4H Jena Engineering, [SN: 751502]
Ot2012_5-2 * Latitude: 53.971800 * Longitude: 8.478400 * Date/Time: 2012-05-22T13:06:00 * O2A Registry URI: hdl:10013/registry.9b4b1111-659c-4ba3-b570-b8bf9fb1ed3e * Location: Elbe river * Campaign: Ot2012_05 * Basis: Otzum * Method/Device: PocketFerryBox, 4H Jena Engineering, [SN: 751502]
Ot2012_5-3 * Latitude: 53.955300 * Longitude: 8.594000 * Date/Time: 2012-05-22T13:53:00 * O2A Registry URI: hdl:10013/registry.9b4b1111-659c-4ba3-b570-b8bf9fb1ed3e * Location: Elbe river * Campaign: Ot2012_05 * Basis: Otzum * Method/Device: PocketFerryBox, 4H Jena Engineering, [SN: 751502]
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
397 data points
Data
| 1 Event | 2 Date/Time | 3 Latitude | 4 Longitude | 5 Depth water [m] | 6 Station | 7 Sal (psu, PocketFerryBox, 4H Jena ...) | 8 Temp [°C] (Temperature at the water inle...) | 9 Chl a [µg/l] (PocketFerryBox, 4H Jena Engin...) | 10 Turbidity [NTU] (PocketFerryBox, 4H Jena Engin...) | 11 Chl a [µg/l] (Lab analysis, Fluorometer, Tu...) | 12 SPM [mg/l] (Lab analysis, Gravimetric ana...) | 13 z(SD) [m] (Secchi disk) | 14 FUI [#] (Forel-Ule scale) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ot2012_5-1 | 2012-05-22T11:35 | 53.9865 | 8.3194 | 1 | 2012_1 | 32.010 | 10.285 | 0.820 | 4.397 | 0.51 | 4.5 | 7 | |
| Ot2012_5-2 | 2012-05-22T13:06 | 53.9718 | 8.4784 | 1 | 2012_2 | 28.132 | 12.604 | 2.117 | 12.400 | 3.32 | 36.87 | 1.0 | 14 |
| Ot2012_5-3 | 2012-05-22T13:53 | 53.9553 | 8.5940 | 1 | 2012_3 | 25.813 | 14.009 | 3.672 | 19.856 | 8.35 | 47.44 | 0.6 | 14 |
| Ot2012_5-4 | 2012-05-22T14:40 | 53.9191 | 8.6661 | 1 | 2012_4 | 22.876 | 13.576 | 4.160 | 23.211 | 3.72 | 65.36 | 0.4 | 16 |
| Ot2012_5-5 | 2012-05-22T15:13 | 53.8774 | 8.7067 | 1 | 2012_5 | 22.629 | 13.108 | 5.646 | 39.966 | 3.99 | 0.2 | 17 | |
| Ot2012_5-6 | 2012-05-22T15:46 | 53.8546 | 8.7430 | 1 | 2012_6 | 18.583 | 13.694 | 9.163 | 55.067 | 4.03 | 0.2 | 17 | |
| Ot2012_5-7 | 2012-05-23T03:03 | 53.8404 | 8.7754 | 1 | 2012_7 | 19.863 | 13.338 | 9.267 | 58.085 | 6.20 | 26.40 | 0.7 | 17 |
| Ot2012_5-8 | 2012-05-23T04:00 | 53.8399 | 8.9110 | 1 | 2012_8 | 11.852 | 13.821 | 5.098 | 59.041 | 6.59 | 16.63 | 0.8 | 16 |
| Ot2012_5-9 | 2012-05-23T04:37 | 53.8475 | 8.9806 | 1 | 2012_9 | 8.806 | 13.800 | 5.182 | 114.873 | 8.06 | 28.28 | 0.6 | 16 |
| Ot2012_5-10 | 2012-05-23T05:18 | 53.8678 | 9.0767 | 1 | 2012_10 | 5.591 | 14.109 | 5.089 | 220.843 | 17.10 | 25.55 | 0.5 | 17 |
| Ot2012_5-11 | 2012-05-23T06:00 | 53.8772 | 9.1740 | 1 | 2012_11 | 4.998 | 14.137 | 5.050 | 346.844 | 70.07 | 44.78 | 0.5 | 18 |
| Ot2012_5-12 | 2012-05-23T06:48 | 53.8667 | 9.2680 | 1 | 2012_12 | 2.896 | 14.627 | 7.012 | 709.950 | 60.10 | 0.4 | 21 | |
| Ot2013_5-1 | 2013-05-27T11:50 | 53.9858 | 8.2223 | 1 | 2013_1 | 28.124 | 11.258 | 15.308 | 13.047 | 5.57 | 1.2 | 16 | |
| Ot2013_5-2 | 2013-05-27T12:26 | 53.9879 | 8.3151 | 1 | 2013_2 | 28.618 | 11.105 | 18.521 | 8.978 | 3.67 | 10.60 | 1.6 | 15 |
| Ot2013_5-3 | 2013-05-27T12:56 | 53.9800 | 8.3989 | 1 | 2013_3 | 29.408 | 10.879 | 24.461 | 9.496 | 5.02 | 16.72 | 1.5 | 15 |
| Ot2013_5-4 | 2013-05-27T13:21 | 53.9733 | 8.4689 | 1 | 2013_4 | 24.741 | 11.583 | 26.995 | 29.814 | 17.72 | 25.97 | 0.7 | 16 |
| Ot2013_5-5 | 2013-05-27T13:58 | 53.9615 | 8.5732 | 1 | 2013_5 | 25.813 | 11.587 | 31.595 | 36.854 | 15.31 | 30.10 | 0.7 | 18 |
| Ot2013_5-6 | 2013-05-27T14:24 | 53.9430 | 8.6379 | 1 | 2013_6 | 23.685 | 11.730 | 24.860 | 30.811 | 13.32 | 21.28 | ||
| Ot2013_5-7 | 2013-05-27T15:03 | 53.8970 | 8.6883 | 1 | 2013_7 | 21.126 | 11.775 | 28.594 | 48.441 | 16.03 | 29.80 | 0.6 | 19 |
| Ot2013_5-8 | 2013-05-27T15:42 | 53.8532 | 8.7463 | 1 | 2013_8 | 18.498 | 11.935 | 20.768 | 42.200 | 18.33 | 29.23 | 0.6 | 18 |
| Ot2013_5-9 | 2013-05-27T17:06 | 53.8363 | 8.8356 | 1 | 2013_9 | 9.659 | 12.848 | 6.147 | 93.841 | 7.69 | 59.70 | 0.3 | 18 |
| Ot2013_5-10 | 2013-05-27T17:58 | 53.8423 | 8.9357 | 1 | 2013_10 | 4.968 | 13.461 | 3.823 | 137.091 | 1.18 | 78.43 | 0.3 | 19 |
| Ot2013_5-11 | 2013-05-27T18:45 | 53.8559 | 9.0260 | 1 | 2013_11 | 2.796 | 13.911 | 2.785 | 112.723 | 0.76 | 48.60 | 0.3 | 19 |
| Ot2013_5-12 | 2013-05-27T19:25 | 53.8751 | 9.1056 | 1 | 2013_12 | 1.736 | 14.204 | 3.484 | 217.000 | 1.34 | 80.30 | 0.2 | 19 |
| Ot2013_5-13 | 2013-05-27T20:11 | 53.8779 | 9.2059 | 1 | 2013_13 | 0.626 | 14.512 | 4.112 | 243.667 | 2.91 | 102.90 | ||
| Ot2013_5-14 | 2013-05-28T05:00 | 53.8609 | 9.2834 | 1 | 2013_14 | 1.308 | 14.286 | 3.017 | 103.677 | 1.95 | 41.10 | ||
| Ot2013_5-15 | 2013-05-28T05:38 | 53.8249 | 9.3539 | 1 | 2013_15 | 0.750 | 14.527 | 3.070 | 69.953 | 1.45 | 37.27 | ||
| Ot2013_5-16 | 2013-05-28T06:08 | 53.7877 | 9.3796 | 1 | 2013_16 | 0.469 | 14.604 | 2.839 | 33.270 | 1.80 | 16.23 | ||
| Ot2013_5-17 | 2013-05-28T06:37 | 53.7484 | 9.4021 | 1 | 2013_17 | 0.480 | 14.713 | 3.469 | 108.893 | 2.40 | 64.82 | 0.5 | 19 |
| Ot2013_5-18 | 2013-05-28T07:04 | 53.7271 | 9.4481 | 1 | 2013_18 | 0.465 | 14.886 | 4.126 | 148.901 | 3.42 | 58.13 | 0.4 | 19 |
| Ot2013_5-19 | 2013-05-28T07:34 | 53.6970 | 9.4903 | 1 | 2013_19 | 0.515 | 14.899 | 3.758 | 70.438 | 2.48 | 45.08 | 0.6 | 17 |
| Ot2013_5-20 | 2013-05-28T08:17 | 53.6426 | 9.5174 | 1 | 2013_20 | 0.453 | 14.719 | 4.391 | 58.822 | 3.74 | 40.26 | 0.6 | 18 |
| Ot2013_5-21 | 2013-05-28T08:44 | 53.6167 | 9.5512 | 1 | 2013_21 | 0.387 | 14.668 | 5.113 | 36.861 | 6.54 | 24.43 | 0.9 | 17 |
| Ot2013_5-22 | 2013-05-28T09:15 | 53.5919 | 9.5998 | 1 | 2013_22 | 0.373 | 14.484 | 8.488 | 68.402 | 12.44 | 51.53 | 0.9 | 17 |
| Ot2013_5-23 | 2013-05-28T09:42 | 53.5673 | 9.6562 | 1 | 2013_23 | 0.379 | 14.786 | 10.350 | 49.591 | 14.04 | 26.05 | 0.7 | 18 |
| Ot2013_5-24 | 2013-05-28T10:12 | 53.5615 | 9.7301 | 1 | 2013_24 | 0.384 | 14.557 | 17.927 | 52.665 | 28.97 | 36.38 | 0.6 | 18 |
| Ot2013_5-25 | 2013-05-28T10:38 | 53.5561 | 9.7863 | 1 | 2013_25 | 0.385 | 14.827 | 15.586 | 37.284 | 27.89 | 24.97 | ||
| Ot2013_5-26 | 2013-05-29T07:30 | 53.5436 | 9.8553 | 1 | 2013_N26 | 0.373 | 14.576 | 21.043 | 40.479 | 24.64 | 28.70 | 0.8 | 19 |
| Ot2013_5-27 | 2013-05-29T08:15 | 53.5404 | 9.9362 | 1 | 2013_N27 | 0.367 | 14.656 | 26.949 | 31.581 | 33.77 | 16.17 | 0.8 | 18 |
| Ot2013_5-28 | 2013-05-29T08:53 | 53.5330 | 10.0211 | 1 | 2013_N28 | 0.366 | 14.969 | 42.531 | 50.417 | 52.08 | 32.85 | 0.5 | 18 |
| Ot2013_5-29 | 2013-05-29T09:21 | 53.5077 | 10.0580 | 1 | 2013_26 | 0.371 | 14.959 | 46.433 | 41.411 | 54.90 | 26.40 | 0.7 | 19 |
| Ot2013_5-30 | 2013-05-29T10:01 | 53.4567 | 10.0730 | 1 | 2013_27 | 0.370 | 14.927 | 45.979 | 44.891 | 55.88 | 29.55 | 0.6 | 19 |
| Ot2013_5-31 | 2013-05-29T10:42 | 53.4226 | 10.1346 | 1 | 2013_28 | 0.371 | 14.889 | 44.799 | 44.109 | 54.60 | 30.33 | 0.6 | 19 |
| Ot2013_5-32 | 2013-05-29T11:21 | 53.3980 | 10.2041 | 1 | 2013_29 | 0.375 | 15.012 | 43.440 | 42.256 | 58.35 | 28.68 | 0.5 | 19 |
| Ot2013_5-33 | 2013-05-29T11:57 | 53.4213 | 10.2704 | 1 | 2013_30 | 0.376 | 15.004 | 46.768 | 42.049 | 53.63 | 24.12 | 0.6 | 18 |
| Ot2013_5-34 | 2013-05-29T13:01 | 53.4298 | 10.3207 | 1 | 2013_31 | 0.373 | 15.182 | 41.176 | 38.988 | 77.07 | 25.10 | 0.5 | 18 |