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Munition compound data for water samples collected from German and Danish waters of Baltic Sea during ALKOR cruise AL603 in October 2023

This dataset consists of munition compound data from the analysis of water samples collected along a cruise track that went through German and Danish waters of the western Baltic Sea in October 2023 during ALKOR cruise AL603. The cruise track started and ended in the Bay of Kiel, via the Little Belt, Bay of Aarhus, Great Belt and Bay of Mecklenburg. Water column samples were collected from 99 stations. Surface and deep-water samples were collected using a rosette of Niskin bottles. A CTD sensor package was also mounted on the the Niskin rosette frame. Samples (1L) were extracted onboard onto solid phase extraction (SPE) columns. Munition compounds were eluted from the SPE columns using acetonitrile, concentrated and reconstituted in 50% methanol/water. The samples were analyzed by ultra high-performance liquid chromatography and high-resolution, atmospheric pressure chemical ionization mass spectrometry.

Munition compound data for water samples collected from the entire German part of the Baltic Sea during ALKOR cruise AL590 in March 2023

We present munition compound data from the analysis of water column samples collected from the entire length of the German waters of Baltic Sea in March 2023 during ALKOR cruise AL590. Water column samples were collected from 93 sampling stations along a transect stretching from Flensburg Fjord to Usedom. Surface and deep-water samples were collected using a rosette of Niskin bottles. A CTD profile was also attached to the Niskin rosette frame. Samples (1L) were extracted onboard onto solid phase extraction (SPE) columns. Munition compounds were eluted from the SPE columns using acetonitrile, concentrated and reconstituted in 50% methanol/water. The samples were analyzed by ultra high-performance liquid chromatography and high-resolution, atmospheric pressure chemical ionization mass spectrometry.

Munition compound data for water samples collected from the south-western Baltic Sea during ALKOR cruise AL583 in October 2022

Water column samples were collected from 62 sampling stations along a transect stretching from Flensburg Fjord to the Bay of Mecklenburg in October 2022 during ALKOR cruise AL583. Here, we present metadata and munition compound data for the samples. Surface, mid-depth and deep-water samples were collected using a rosette of Niskin bottles. A CTD sensor package was also mounted on the Niskin rosette frame. Samples (1L) were extracted onboard onto solid phase extraction (SPE) columns. Munition compounds were eluted from the SPE columns using acetonitrile, concentrated and reconstituted in 50% methanol/water. The samples were analyzed by ultra high-performance liquid chromatography and high-resolution, atmospheric pressure chemical ionization mass spectrometry.

Dissolved munition compounds in the water column of southwestern Baltic Sea during ALKOR cruise AL567

Cruise AL567 (R/V Alkor) sampled the water column in German territorial waters of the southwest Baltic Sea during 18-30 October 2021. This dataset contains concentrations of dissolved munition compounds from 88 Niskin bottle rosette casts between sea surface and seafloor. Samples were collected at the sea surface (1-2 m depth), approximately 2 m above the seafloor, and immediately below the pycnocline. Dissolved explosives in the samples were measured following Gledhill et al. (2019). Briefly, discrete samples (1 L) were preconcentrated onboard using solid-phase extraction. Target compounds were eluted with acetonitrile, further concentrated by evaporation, and measured by ultra-high performance liquid chromatography and high resolution heated electrospray ionization mass spectrometry.

Dissolved munition compounds in the water column measured during ALKOR cruise AL548, southwestern Baltic Sea

Cruise AL548 (R/V Alkor) sampled the water column in German territorial waters of the southwest Baltic Sea during 04-16 November 2020. This dataset contains concentrations of dissolved munition compounds from 73 Niskin bottle rosette casts between sea surface and seafloor. Vertical sampling resolution varied among stations, with a maximum of 5 sampling depths. Dissolved explosives in the samples were measured following Gledhill et al. (2019). Briefly, discrete samples (1 L) were preconcentrated onboard using solid-phase extraction. Target compounds were eluted with acetonitrile, further concentrated by evaporation, and measured by ultra-high performance liquid chromatography and high resolution heated electrospray ionization mass spectrometry.

Dissolved munition compounds in the water column of southwestern Baltic Sea during POSEIDON cruise POS530 in October 2018

Cruise POS530 (R/V Poseidon) sampled the water column throughout German territorial waters of the southwest Baltic Sea during 01-21 October 2018. The current dataset contains concentrations of dissolved munition compounds from Niskin bottle rosette casts between sea surface and seafloor. Vertical sampling resolution varied among stations, with a maximum of 9 sampling depths. Dissolved explosives in the samples were measured following Gledhill et al. (2019). Briefly, discrete samples (1 L) were preconcentrated onboard using solid-phase extraction. Target compounds were eluted with acetonitrile, further concentrated by evaporation, and measured by ultra-high performance liquid chromatography and high resolution heated electrospray ionization mass spectrometry.