Citation:

PANGAEA.991564 (DOI registration in progress)

Name: CTD and nutrient data collected by the RV TÜBİTAK MARMARA during the ASTRA cruise in September 2025 (Western Black Sea, North-Eastern Marmara Sea)
Published: 2026-02-23
License: https://creativecommons.org/licenses/by/4.0/
Keywords: ASTRA Cruise; Black Sea; CTD profiles; Marmara Sea; Nutrient data

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Published: 2026-02-23

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Abstract:

CTD and nutrient data were collected during the ASTRA expedition aboard RV TÜBİTAK MARMARA in September 2025 in the Western Black Sea and the North-Eastern Marmara Sea. The dataset comprises vertical profiles measured from the surface down to a maximum depth of 100 m and includes temperature, salinity, density (sigma-t), dissolved oxygen (mg/L and % saturation), fluorescence, turbidity, and photosynthetically active radiation (PAR). In addition, Secchi disc depth measurements and discrete water sample analyses of phosphate (PO₄-P), total phosphorus (TP), silicate (Si), nitrate + nitrite (NOx), ammonium (NH₄-N), total nitrogen (TN), chlorophyll-a, and Winkler dissolved oxygen are provided. These data characterize the physical and biogeochemical structure of the upper water column and can support analyses of stratification, nutrient dynamics, and ecosystem processes in the study area.

Keyword(s):

ASTRA Cruise; Black Sea; CTD profiles; Marmara Sea; Nutrient data

Funding:

Horizon Europe (HorizonEU), grant/award no. 101130915 : Aqua Research Infrastructure Services for the health and protection of our unique, oceans, seas and freshwater ecosystems (AQUARIUS)

Coverage:

Median Latitude: 42.378824 * Median Longitude: 29.441140 * South-bound Latitude: 40.720001 * West-bound Longitude: 28.119499 * North-bound Latitude: 44.587601 * East-bound Longitude: 31.049801

Date/Time Start: 2025-09-06T06:19:00 * Date/Time End: 2025-09-20T12:11:00

Minimum Elevation: -2100.0 m * Maximum Elevation: -26.0 m

Event(s):

2025-09_ASTRA_01_39 * Latitude: 40.835201 * Longitude: 29.037600 * Date/Time: 2025-09-06T06:19:00 * Elevation: -100.0 m * Campaign: * Basis: * Method/Device: (CTD-RO)

2025-09_ASTRA_02_38 * Latitude: 40.940300 * Longitude: 28.938200 * Date/Time: 2025-09-06T09:10:00 * Elevation: -64.0 m * Campaign: * Basis: * Method/Device: (CTD-RO)

2025-09_ASTRA_03_36 * Latitude: 40.950199 * Longitude: 28.611300 * Date/Time: 2025-09-06T11:41:00 * Elevation: -47.0 m * Campaign: * Basis: * Method/Device: (CTD-RO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Mutlu, Sabri
2	Campaign	Campaign		Boicenco, Laura
3	Station label	Station		Mutlu, Sabri
4	Type	Type		Mutlu, Sabri
5	DATE/TIME	Date/Time		Mutlu, Sabri	GPS Navigator, Koden, KGP-920	Geocode
6	LONGITUDE	Longitude		Mutlu, Sabri	GPS Navigator, Koden, KGP-920	Geocode
7	LATITUDE	Latitude		Mutlu, Sabri	GPS Navigator, Koden, KGP-920	Geocode
8	ELEVATION	Elevation	m a.s.l.	Mutlu, Sabri	Echosounder, Elac-Nautik, HydroStar 4900	Geocode
9	DEPTH, water	Depth water	m	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; calculated using SBE Data Processing Version 7.26.7	Geocode
10	Temperature, water	Temp	°C	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; calculated using SBE Data Processing Version 7.26.7
11	Salinity	Sal		Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; calculated using SBE Data Processing Version 7.26.7	PSU
12	Density, sigma-theta (0)	Sigma-theta	kg/m³	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; calculated using SBE Data Processing Version 7.26.7
13	Oxygen, dissolved	DO	mg/l	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with Dissolved oxygen sensor, Sea-Bird, SBE 43
14	Oxygen, dissolved	DO	%	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with Dissolved oxygen sensor, Sea-Bird, SBE 43
15	Fluorescence	Fluorescence	mg/m³	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with Fluorometer, WET Labs, ECO-AFL/FL
16	Turbidity (Nephelometric turbidity unit)	Turbidity	NTU	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with Turbidity sensor, WET Labs, ECO NTU
17	Radiation, photosynthetically active	PAR		Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with PAR sensor, Biospherical, LI-COR
18	Pressure, water	Press	dbar	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; calculated using SBE Data Processing Version 7.26.7
19	Conductivity	Cond	mS/cm	Mutlu, Sabri	CTD, Sea-Bird, SBE 25plus; measured with conductivity sensor, SEA-BIRD, SBE 4
20	pH	pH		Mutlu, Sabri	pH sensor, Mettler Toledo, InLab Expert	determined in laboratory
21	Temperature, water	Temp	°C	Mutlu, Sabri	pH sensor, Mettler Toledo, InLab Expert	determined in laboratory
22	Oxidation reduction (RedOx) potential	Eh	mV	Mutlu, Sabri	Redox electrode, Mettler Toledo, InLab Expert	determined in laboratory
23	Depth of Secchi Disk	z(SD)	m	Aslan, Ertugrul	Secchi disc
24	Phosphate	[PO4]3-	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
25	Phosphorus, total	TP	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
26	Silicate	Si(OH)4	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
27	Nitrate and Nitrite	[NO3]- + [NO2]-	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
28	Ammonium	[NH4]+	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
29	Nitrogen, total	TN	µmol/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
30	Chlorophyll a	Chl a	µg/l	Aslan, Ertugrul	Auto analyzer, SEAL Analytical, QuAAtro	determined in laboratory
31	Oxygen, dissolved	DO	mg/l	Aslan, Ertugrul	Winkler titration	determined in laboratory

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:

36156 data points

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