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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 (DOI registration in progress)

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Published: 2026-06-15

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Abstract:
This dataset was collected during the cruise MSM139 (GreenHab, 25.07 - 27.08.2025) with RV MARIA S MERIAN from Reykjavik, Iceland to Reykjavik, Iceland. The dataset contains chlorophyll a measurements [µg/L] from water samples collected from discrete sampling via CTD. In total, 33 stations have been sampled from various depth. 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 via 90% acetone. Concentrations were calculated from fluorescence measured with a pre-calibrated Turner Design TD7200-02 laboratory fluorometer (EPA445.0, Turner Manual). Chief Scientist of RV Maria S Merian cruise MSM139: Dr.Uwe John, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI).
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; 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
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: 67.755994 * Median Longitude: -52.116549 * South-bound Latitude: 59.776200 * West-bound Longitude: -58.721000 * North-bound Latitude: 75.001100 * East-bound Longitude: -44.493100
Date/Time Start: 2025-07-28T08:03:00 * Date/Time End: 2025-08-21T16:49:00
Minimum Elevation: -1074.0 m * Maximum Elevation: -83.0 m
Event(s):
MSM139_1-1  * Latitude: 59.776207 * Longitude: -44.493185 * Date/Time: 2025-07-28T08:18:00 * Elevation: -242.0 m * O2A Registry URI: sensor.awi.de * Campaign: MSM139 (GreenHab) * Basis: Maria S. Merian * Method/Device: CTD/Rosette (CTD-RO)
MSM139_2-1  * Latitude: 60.622185 * Longitude: -46.535452 * Date/Time: 2025-07-29T08:08:00 * Elevation: -89.0 m * O2A Registry URI: sensor.awi.de * Campaign: MSM139 (GreenHab) * Basis: Maria S. Merian * Method/Device: CTD/Rosette (CTD-RO)
MSM139_3-1  * Latitude: 60.860580 * Longitude: -46.094315 * Date/Time: 2025-07-29T14:44:00 * Elevation: -319.0 m * O2A Registry URI: sensor.awi.de * Campaign: MSM139 (GreenHab) * Basis: Maria S. Merian * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEventOelker, JuliaStation label, Dship system
DATE/TIMEDate/TimeOelker, JuliaGeocode
LATITUDELatitudeOelker, JuliaGeocode
LONGITUDELongitudeOelker, JuliaGeocode
ELEVATIONElevationm a.s.l.Oelker, JuliaCTD, Sea-Bird, SBE 911plusGeocode
DEPTH, waterDepth watermOelker, JuliaCTD, Sea-Bird, SBE 911plusGeocode
Chlorophyll aChl aµg/lOelker, JuliaFluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0]
Phaeophytin aPhaeophytin aµg/lOelker, JuliaFluorometer, Turner Designs, Trilogy 7200-002 [EPA Method 445.0]
Phaeophytin a/Chlorophyll a ratioPhaeophytin a/Chl aOelker, JuliaFluorometer, Turner Designs, Trilogy 7200-002
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
387 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Event

Date/Time

Latitude

Longitude

Elevation [m a.s.l.]

Depth water [m]

Chl a [µg/l]

Phaeophytin a [µg/l]

Phaeophytin a/Chl a
MSM139_1-1 2025-07-28T08:03:0059.7762-44.4931-242.010.00.820.210.25
MSM139_1-12025-07-28T08:03:0059.7762-44.4931-242.015.00.680.240.35
MSM139_1-12025-07-28T08:03:0059.7762-44.4931-242.025.00.760.300.40
MSM139_1-12025-07-28T08:03:0059.7762-44.4931-242.040.00.770.330.43
MSM139_2-1 2025-07-29T08:00:0060.6222-46.5355-83.03.00.160.020.12
MSM139_2-12025-07-29T08:00:0060.6222-46.5355-83.015.00.290.060.20
MSM139_2-12025-07-29T08:00:0060.6222-46.5355-83.025.00.220.090.41
MSM139_2-12025-07-29T08:00:0060.6222-46.5355-83.040.00.120.060.48
MSM139_3-1 2025-07-29T14:32:0060.8606-46.0943-319.03.02.190.600.27
MSM139_3-12025-07-29T14:32:0060.8606-46.0943-319.015.01.440.850.59
MSM139_3-12025-07-29T14:32:0060.8606-46.0943-319.040.00.240.090.37
MSM139_4-1 2025-07-30T05:59:0061.0986-45.4233-126.03.00.730.220.30
MSM139_4-12025-07-30T05:59:0061.0986-45.4233-126.010.00.420.140.33
MSM139_4-12025-07-30T05:59:0061.0986-45.4233-126.040.00.100.040.41
MSM139_5-1 2025-07-30T16:22:0060.9603-46.2421-354.03.05.001.140.23
MSM139_5-12025-07-30T16:22:0060.9603-46.2421-354.010.02.560.980.38
MSM139_5-12025-07-30T16:22:0060.9603-46.2421-354.015.00.610.190.32
MSM139_5-12025-07-30T16:22:0060.9603-46.2421-354.040.00.170.060.38
MSM139_6-1 2025-07-31T07:55:0060.8191-46.7011-657.03.02.550.610.24
MSM139_6-12025-07-31T07:55:0060.8191-46.7011-657.07.02.480.020.01
MSM139_6-12025-07-31T07:55:0060.8191-46.7011-657.015.00.450.170.37
MSM139_6-12025-07-31T07:55:0060.8191-46.7011-657.040.00.130.060.46
MSM139_7-1 2025-07-31T13:32:0060.7016-47.1735-130.03.01.160.140.13
MSM139_7-12025-07-31T13:32:0060.7016-47.1735-130.07.01.410.610.43
MSM139_7-12025-07-31T13:32:0060.7016-47.1735-130.015.00.350.110.31
MSM139_7-12025-07-31T13:32:0060.7016-47.1735-130.040.00.100.030.26
MSM139_8-1 2025-08-02T09:03:0064.1168-51.8830-363.03.05.391.500.28
MSM139_8-12025-08-02T09:03:0064.1168-51.8830-363.08.05.461.630.30
MSM139_8-12025-08-02T09:03:0064.1168-51.8830-363.012.04.270.970.23
MSM139_8-12025-08-02T09:03:0064.1168-51.8830-363.040.00.840.440.53
MSM139_9-2 2025-08-02T16:58:0064.2570-51.0837-371.03.01.160.240.21
MSM139_9-22025-08-02T16:58:0064.2570-51.0837-371.015.02.230.710.32
MSM139_9-22025-08-02T16:58:0064.2570-51.0837-371.022.53.291.060.32
MSM139_9-22025-08-02T16:58:0064.2570-51.0837-371.040.00.620.310.49
MSM139_10-1 2025-08-03T09:00:0064.5017-50.6260-168.03.01.730.120.07
MSM139_10-12025-08-03T09:00:0064.5017-50.6260-168.015.04.270.970.23
MSM139_10-12025-08-03T09:00:0064.5017-50.6260-168.016.512.064.540.38
MSM139_10-12025-08-03T09:00:0064.5017-50.6260-168.040.00.630.360.57
MSM139_11-2 2025-08-03T19:02:0064.4267-51.5110-618.03.03.890.860.22
MSM139_11-22025-08-03T19:02:0064.4267-51.5110-618.08.07.321.610.22
MSM139_11-22025-08-03T19:02:0064.4267-51.5110-618.015.00.800.230.28
MSM139_11-22025-08-03T19:02:0064.4267-51.5110-618.040.00.740.270.36
MSM139_12-1 2025-08-07T08:54:0075.0011-58.7210-447.03.00.380.080.21
MSM139_12-12025-08-07T08:54:0075.0011-58.7210-447.015.00.730.170.24
MSM139_12-12025-08-07T08:54:0075.0011-58.7210-447.035.03.481.010.29
MSM139_12-12025-08-07T08:54:0075.0011-58.7210-447.040.02.791.660.60
MSM139_13-1 2025-08-07T16:42:0074.7477-58.4976-1071.03.00.340.060.18
MSM139_13-12025-08-07T16:42:0074.7477-58.4976-1071.015.00.700.290.41
MSM139_13-12025-08-07T16:42:0074.7477-58.4976-1071.032.53.842.040.53
MSM139_13-12025-08-07T16:42:0074.7477-58.4976-1071.040.01.381.240.89
MSM139_14-2 2025-08-07T20:48:0074.5235-58.3097-470.03.00.340.070.21
MSM139_14-22025-08-07T20:48:0074.5235-58.3097-470.015.00.760.260.33
MSM139_14-22025-08-07T20:48:0074.5235-58.3097-470.030.03.531.040.29
MSM139_14-22025-08-07T20:48:0074.5235-58.3097-470.040.00.580.430.75
MSM139_15-1 2025-08-08T06:58:0074.2709-58.2460-888.03.00.420.040.09
MSM139_15-12025-08-08T06:58:0074.2709-58.2460-888.015.00.880.320.36
MSM139_15-12025-08-08T06:58:0074.2709-58.2460-888.032.03.331.250.38
MSM139_15-12025-08-08T06:58:0074.2709-58.2460-888.040.01.170.240.20
MSM139_16-1 2025-08-08T11:49:0073.9797-58.0038-400.03.00.320.100.31
MSM139_16-12025-08-08T11:49:0073.9797-58.0038-400.015.00.420.190.46
MSM139_16-12025-08-08T11:49:0073.9797-58.0038-400.038.02.100.800.38
MSM139_16-12025-08-08T11:49:0073.9797-58.0038-400.040.02.890.920.32
MSM139_17-1 2025-08-08T18:04:0073.6841-57.1934-663.03.00.360.060.18
MSM139_17-12025-08-08T18:04:0073.6841-57.1934-663.015.01.050.330.31
MSM139_17-12025-08-08T18:04:0073.6841-57.1934-663.035.02.080.840.40
MSM139_17-12025-08-08T18:04:0073.6841-57.1934-663.040.02.282.060.90
MSM139_18-1 2025-08-10T10:51:0071.5911-52.3343-896.03.02.790.420.15
MSM139_18-12025-08-10T10:51:0071.5911-52.3343-896.015.01.420.550.39
MSM139_18-12025-08-10T10:51:0071.5911-52.3343-896.030.00.670.340.52
MSM139_18-12025-08-10T10:51:0071.5911-52.3343-896.040.00.250.100.39
MSM139_19-1 2025-08-10T20:45:0071.5725-52.7160-810.03.01.370.380.27
MSM139_19-12025-08-10T20:45:0071.5725-52.7160-810.015.02.250.650.29
MSM139_19-12025-08-10T20:45:0071.5725-52.7160-810.022.01.390.480.34
MSM139_19-12025-08-10T20:45:0071.5725-52.7160-810.040.00.400.080.20
MSM139_20-1 2025-08-11T09:01:0071.4258-53.3613-620.03.00.380.120.31
MSM139_20-12025-08-11T09:01:0071.4258-53.3613-620.015.01.340.670.49
MSM139_20-12025-08-11T09:01:0071.4258-53.3613-620.030.01.000.560.56
MSM139_20-12025-08-11T09:01:0071.4258-53.3613-620.040.00.640.310.48
MSM139_21-1 2025-08-11T14:59:0071.1669-54.5886-345.03.00.940.400.43
MSM139_21-12025-08-11T14:59:0071.1669-54.5886-345.015.00.480.240.49
MSM139_21-12025-08-11T14:59:0071.1669-54.5886-345.045.01.560.820.52
MSM139_21-12025-08-11T14:59:0071.1669-54.5886-345.040.02.000.700.35
MSM139_22-1 2025-08-14T08:56:0068.4748-54.0005-514.03.02.400.530.22
MSM139_22-12025-08-14T08:56:0068.4748-54.0005-514.015.02.780.770.28
MSM139_22-12025-08-14T08:56:0068.4748-54.0005-514.025.01.010.200.20
MSM139_22-12025-08-14T08:56:0068.4748-54.0005-514.040.01.820.990.54
MSM139_23-1 2025-08-14T18:22:0068.8086-53.0634-726.03.03.092.230.72
MSM139_23-12025-08-14T18:22:0068.8086-53.0634-726.015.01.620.920.57
MSM139_23-12025-08-14T18:22:0068.8086-53.0634-726.020.02.350.830.35
MSM139_23-12025-08-14T18:22:0068.8086-53.0634-726.040.00.500.400.80
MSM139_24-1 2025-08-15T08:58:0068.7568-52.0263-123.03.01.100.340.31
MSM139_24-12025-08-15T08:58:0068.7568-52.0263-123.07.01.040.370.35
MSM139_24-12025-08-15T08:58:0068.7568-52.0263-123.015.00.760.350.47
MSM139_24-12025-08-15T08:58:0068.7568-52.0263-123.040.00.380.060.15
MSM139_25-1 2025-08-15T12:59:0068.7123-51.1089-356.03.02.080.610.29
MSM139_25-12025-08-15T12:59:0068.7123-51.1089-356.015.02.961.320.44
MSM139_25-12025-08-15T12:59:0068.7123-51.1089-356.025.00.350.130.37
MSM139_25-12025-08-15T12:59:0068.7123-51.1089-356.040.00.300.230.76
MSM139_26-2 2025-08-15T19:13:0069.1224-51.9940-510.03.012.923.310.26
MSM139_26-22025-08-15T19:13:0069.1224-51.9940-510.04.010.360.530.05
MSM139_26-22025-08-15T19:13:0069.1224-51.9940-510.015.00.490.531.08
MSM139_26-22025-08-15T19:13:0069.1224-51.9940-510.040.00.170.311.79
MSM139_27-1 2025-08-16T08:57:0069.3083-51.2959-378.03.05.301.400.26
MSM139_27-12025-08-16T08:57:0069.3083-51.2959-378.09.02.950.790.27
MSM139_27-12025-08-16T08:57:0069.3083-51.2959-378.015.00.960.360.38
MSM139_27-12025-08-16T08:57:0069.3083-51.2959-378.040.00.320.100.32
MSM139_28-1 2025-08-16T14:59:0069.6860-51.6656-247.03.08.171.050.13
MSM139_28-12025-08-16T14:59:0069.6860-51.6656-247.015.08.760.540.06
MSM139_28-12025-08-16T14:59:0069.6860-51.6656-247.040.01.020.570.56
MSM139_29-2 2025-08-16T20:00:0069.3237-52.2995-366.03.05.701.190.21
MSM139_29-22025-08-16T20:00:0069.3237-52.2995-366.08.04.261.220.29
MSM139_29-22025-08-16T20:00:0069.3237-52.2995-366.015.05.421.040.19
MSM139_29-22025-08-16T20:00:0069.3237-52.2995-366.040.00.210.401.93
MSM139_30-1 2025-08-17T08:56:0069.1851-53.5186-337.03.00.630.260.42
MSM139_30-12025-08-17T08:56:0069.1851-53.5186-337.015.00.730.260.35
MSM139_30-12025-08-17T08:56:0069.1851-53.5186-337.025.01.150.320.28
MSM139_30-12025-08-17T08:56:0069.1851-53.5186-337.040.00.610.220.37
MSM139_31-1 2025-08-17T17:35:0069.2732-54.0266-82.03.00.950.300.32
MSM139_31-12025-08-17T17:35:0069.2732-54.0266-82.015.01.880.720.38
MSM139_31-12025-08-17T17:35:0069.2732-54.0266-82.024.01.870.570.31
MSM139_31-12025-08-17T17:35:0069.2732-54.0266-82.040.00.350.371.05
MSM139_32-1 2025-08-21T13:12:0064.1915-50.6193-395.03.02.830.890.32
MSM139_32-12025-08-21T13:12:0064.1915-50.6193-395.015.02.850.800.28
MSM139_32-12025-08-21T13:12:0064.1915-50.6193-395.024.01.990.570.28
MSM139_32-12025-08-21T13:12:0064.1915-50.6193-395.040.00.810.420.52
MSM139_33-2 2025-08-21T16:49:0064.0953-51.1976-719.03.03.120.880.28
MSM139_33-22025-08-21T16:49:0064.0953-51.1976-719.07.02.920.920.32
MSM139_33-22025-08-21T16:49:0064.0953-51.1976-719.015.02.051.010.49
MSM139_33-22025-08-21T16:49:0064.0953-51.1976-719.040.00.780.350.44