/* DATA DESCRIPTION:
Citation:	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)
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):	Chlorophyll a; Disco Bay; Fluorescence; Greenland; Melville Bay; Narsaq; Nuuk; Phaeophytin a; Uummanaq
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, https://download.pangaea.de/reference/107393/attachments/M445_0.PDF
	Turner Designs (2019): Trilogy Laboratory Fluorometer User's Manual, Version 1.7. San Jose, CA, USA, https://download.pangaea.de/reference/124949/attachments/998-7210.pdf
Documentation:	Non-Exclusive Licence No. G25-007 for Utilization of Greenland Genetic Resources (2025). Naalakkersuisut - Government of Greenland, https://download.pangaea.de/reference/140046/attachments/Genetic%20Resource%20License%20No.%20G25-007.pdf
Funding:	Federal Ministry of Education and Research (BMBF) (URI: https://www.bmbf.de/), grant/award no. 03F0945A: GreenHAB: Risiken der durch den Klimawandel verursachten schädlichen Algenblüte in grönländischen Gewässern (URI: https://foerderportal.bund.de/foekat/jsp/SucheAction.do?actionMode=view&fkz=03F0945A)
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 (URI: https://en.wikipedia.org/wiki/RV_Maria_S._Merian) * METHOD/DEVICE: Water sample (WS) * COMMENT: event was not logged in DSHIP
Parameter(s):	DATE/TIME (Date/Time) * GEOCODE * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de)
	LATITUDE (Latitude) * GEOCODE * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de)
	LONGITUDE (Longitude) * GEOCODE * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de)
	Sample ID (Sample ID) * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de)
	DEPTH, water [m] (Depth water) * GEOCODE * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de)
	Chlorophyll a [µg/l] (Chl a) * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de) * METHOD/DEVICE: Fluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0]
	Phaeophytin a [µg/l] (Phaeophytin a) * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de) * METHOD/DEVICE: Fluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0]
	Phaeophytin a/Chlorophyll a ratio (Phaeophytin a/Chl a) * PI: Oelker, Julia (https://orcid.org/0000-0002-0783-3617, julia.oelker@uni-oldenburg.de) * METHOD/DEVICE: Fluorometer, Turner Designs, Trilogy 7200-002
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) * Processing Level: PANGAEA data processing level 3 (URI: https://wiki.pangaea.de/wiki/Processing_levels#PANGAEA_data_processing_level_3)
Size:	128 data points
*/
Date/Time	Latitude	Longitude	Sample ID	Depth water [m]	Chl a [µg/l]	Phaeophytin a [µg/l]	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