Oelker, Julia; Voß, Daniela; Henkel, Rohan; Badewien, Thomas Henry (2026): Chlorophyll a and phaeophytin a measurements from discrete water samples during RV MARIA S. MERIAN cruise MSM139 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995260 (DOI registration in progress)
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Published: 2026-06-15
Abstract:
This dataset was collected during the cruise MSM139 (GreenHab, 25.07 - 27.08.2025) with RV MARIA S. MERIAN from Reykjavic, Iceland to Reykjavik, Iceland. The dataset contains chlorophyll-a measurements [µg/l] from water samples directly collected from the seawater supply (Reinseewassersystem, RSWS) of the ship to calibrate the fluorometers of the RSWS system. To obtain chl-a concentrations, water samples were filtered onboard through 0.7 μm pore size, glass fiber filters (Whatmann GF/F) under low vacuum. Filters were frozen immediately at -80 °C until extraction in laboratory by 90% acetone method. Concentrations were calculated from fluorescence measured with a pre-calibrated Turner Design TD 7200-02 laboratory fluorometer (EPA445.0, Turner Manual).
Keyword(s):
Related to:
John, Uwe; Christensen, Anneliese; Becks, Lutz; Thielecke, Antonia; Voß, Daniela; Henkel, Rohan; Oelker, Julia; Thome, Pauline; Andipalagan, Mathiroopini; Schmitt-Kopplin, Philippe; Clarke, Dave; Burfeid-Castellanos, Andrea M; Eikrem, Wenche; Lundholm, Nina; Nagai, Satoshi; Honorato, Ricardo; Kühne, Nancy; Kopplin, Leila (2025): Investigate and evaluate the risks of harmful algae blooms in Greenlandic waters due to climate change: Assessment of range expansion and HAB population connectivity, Cruise No. MSM139, 25.07.2025 - 27.08.2025, Reykjavík (Iceland) - Reykjavík (Iceland). MARIA S. MERIAN-Berichte, Begutachtungspanel Forschungsschiffe, MSM139, 50 pp, https://doi.org/10.48433/cr_msm139
Oelker, Julia; Dietrich, Kathrin; Voß, Daniela; Henkel, Rohan; Badewien, Thomas Henry (2026): Total suspended matter, particulate organic matter and particulate inorganic matter from discrete water samples during RV MARIA S. MERIAN cruise MSM139 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995261
Oelker, Julia; John, Uwe; Henkel, Rohan; Voß, Daniela (2026): Continuous optical chlorophyll-a and turbidity data along RV MARIA S. MERIAN cruise MSM139 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995178
Oelker, Julia; Voß, Daniela; Henkel, Rohan; Badewien, Thomas Henry (2026): Chlorophyll a and phaeophytin a measurements from discrete bottle water samples during RV MARIA S. MERIAN cruise MSM139 (25.07. 2025 - 27.08.2025, GreenHab) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995241
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)
Turner Designs (2019): Trilogy Laboratory Fluorometer User's Manual, Version 1.7. San Jose, CA, USA, 998-7210.pdf
Documentation:
Non-Exclusive Licence No. G25-007 for Utilization of Greenland Genetic Resources (2025). Naalakkersuisut - Government of Greenland, Genetic Resource License No. G25-007.pdf
Funding:
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0945A: GreenHAB: Risiken der durch den Klimawandel verursachten schädlichen Algenblüte in grönländischen Gewässern
Coverage:
Median Latitude: 66.413913 * Median Longitude: -51.636818 * South-bound Latitude: 59.681340 * West-bound Longitude: -58.713750 * North-bound Latitude: 75.003120 * East-bound Longitude: -32.318500
Date/Time Start: 2025-07-28T06:10:00 * Date/Time End: 2025-08-25T05:54:00
Minimum DEPTH, water: 4.0 m * Maximum DEPTH, water: 4.0 m
Event(s):
MSM139_0_Underway-8 * Latitude Start: 59.681340 * Longitude Start: -44.185220 * Latitude End: 61.956080 * Longitude End: -32.318500 * Date/Time Start: 2025-07-28T06:10:00 * Date/Time End: 2025-08-25T05:54:00 * Campaign: MSM139 (GreenHab) * Basis: Maria S. Merian * Method/Device: Water sample (WS) * Comment: event was not logged in DSHIP
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Oelker, Julia | Geocode | ||
| 2 | LATITUDE | Latitude | Oelker, Julia | Geocode | ||
| 3 | LONGITUDE | Longitude | Oelker, Julia | Geocode | ||
| 4 | Sample ID | Sample ID | Oelker, Julia | |||
| 5 | DEPTH, water | Depth water | m | Oelker, Julia | Geocode | |
| 6 | Chlorophyll a | Chl a | µg/l | Oelker, Julia | Fluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0] | |
| 7 | Phaeophytin a | Phaeophytin a | µg/l | Oelker, Julia | Fluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0] | |
| 8 | Phaeophytin a/Chlorophyll a ratio | Phaeophytin a/Chl a | Oelker, Julia | Fluorometer, Turner Designs, Trilogy 7200-002 |
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:
128 data points
Data
| 1 Date/Time | 2 Latitude | 3 Longitude | 4 Sample ID | 5 Depth water [m] | 6 Chl a [µg/l] | 7 Phaeophytin a [µg/l] | 8 Phaeophytin a/Chl a |
|---|---|---|---|---|---|---|---|
| 2025-07-28T06:10:00 | 59.68134 | -44.18522 | UW1 | 4.0 | 0.43 | 0.32 | 0.739 |
| 2025-07-28T18:54:00 | 59.82086 | -45.49290 | UW2 | 4.0 | 0.45 | 0.13 | 0.287 |
| 2025-07-29T06:14:00 | 60.57276 | -46.51388 | UW3 | 4.0 | 0.18 | 0.08 | 0.420 |
| 2025-07-30T05:07:00 | 61.06251 | -45.47346 | UW4 | 4.0 | 0.74 | 0.26 | 0.346 |
| 2025-07-31T06:13:00 | 60.81953 | -46.70154 | UW5 | 4.0 | 3.36 | 0.74 | 0.221 |
| 2025-08-01T05:06:00 | 61.50897 | -49.79626 | UW6 | 4.0 | 0.69 | 0.18 | 0.259 |
| 2025-08-01T20:49:00 | 63.10395 | -51.41863 | UW7 | 4.0 | 0.74 | 0.14 | 0.192 |
| 2025-08-02T07:08:00 | 64.08332 | -52.07260 | UW8 | 4.0 | 1.96 | 0.77 | 0.393 |
| 2025-08-03T07:11:00 | 64.50180 | -50.62594 | UW9 | 4.0 | 0.71 | 0.17 | 0.244 |
| 2025-08-04T04:57:00 | 64.07354 | -52.36088 | UW10 | 4.0 | 3.44 | 0.47 | 0.138 |
| 2025-08-05T05:07:00 | 67.79833 | -55.72010 | UW11 | 4.0 | 0.95 | 0.33 | 0.345 |
| 2025-08-06T04:13:00 | 71.58356 | -57.61269 | UW12 | 4.0 | 0.58 | 0.29 | 0.499 |
| 2025-08-07T07:09:00 | 75.00312 | -58.71375 | UW13 | 4.0 | 0.41 | 0.04 | 0.105 |
| 2025-08-08T00:57:00 | 74.31553 | -58.43109 | UW14 | 4.0 | 0.31 | 0.09 | 0.288 |
| 2025-08-09T04:10:00 | 73.07797 | -57.47076 | UW15 | 4.0 | 0.42 | 0.14 | 0.328 |
| 2025-08-10T00:00:00 | 71.20802 | -54.18675 | UW16 | 4.0 | 1.21 | 0.25 | 0.206 |
| 2025-08-10T03:12:00 | 71.41500 | -53.36280 | UW17 | 4.0 | 0.73 | 0.10 | 0.138 |
| 2025-08-11T02:55:00 | 71.42443 | -53.43245 | UW18 | 4.0 | 0.93 | 0.20 | 0.214 |
| 2025-08-12T03:02:00 | 70.75322 | -57.13158 | UW19 | 4.0 | 0.52 | 0.26 | 0.495 |
| 2025-08-12T04:29:00 | 70.60686 | -57.07069 | UW20 | 4.0 | 0.38 | 0.07 | 0.177 |
| 2025-08-13T03:03:00 | 68.77225 | -54.20390 | UW21 | 4.0 | 1.63 | 0.37 | 0.226 |
| 2025-08-15T01:05:00 | 68.77312 | -52.07900 | UW22 | 4.0 | 1.33 | 0.75 | 0.569 |
| 2025-08-15T23:58:00 | 69.30425 | -51.42280 | UW23 | 4.0 | 6.07 | 0.48 | 0.079 |
| 2025-08-17T01:56:00 | 69.20514 | -53.33130 | UW24 | 4.0 | 0.98 | 0.17 | 0.179 |
| 2025-08-18T00:49:00 | 69.17606 | -55.18180 | UW25 | 4.0 | 0.75 | 0.04 | 0.052 |
| 2025-08-19T01:54:00 | 66.56998 | -55.18220 | UW26 | 4.0 | 0.81 | 0.40 | 0.491 |
| 2025-08-19T03:31:00 | 66.40459 | -55.11170 | UW27 | 4.0 | 0.95 | 0.15 | 0.161 |
| 2025-08-20T01:43:00 | 64.37228 | -52.79510 | UW28 | 4.0 | 2.06 | 0.30 | 0.144 |
| 2025-08-22T01:43:00 | 63.82984 | -52.33400 | UW29 | 4.0 | 0.60 | 0.25 | 0.415 |
| 2025-08-23T00:06:00 | 60.50613 | -50.14410 | UW30 | 4.0 | 2.43 | 0.63 | 0.257 |
| 2025-08-24T05:37:00 | 59.96086 | -40.49980 | UW31 | 4.0 | 1.34 | 0.52 | 0.386 |
| 2025-08-25T05:54:00 | 61.95608 | -32.31850 | UW32 | 4.0 | 0.93 | 0.46 | 0.498 |