https://doi.pangaea.de/10.1594/PANGAEA.993580Karnatz, JosefineJosefineKarnatzGEOMAR - Helmholtz Centre for Ocean Research KielBarthelmeß, TheresaTheresaBarthelmeß0000-0001-7573-4621GEOMAR - Helmholtz Centre for Ocean Research KielSabbaghzadeh, BitaBitaSabbaghzadeh0000-0002-1232-0576Leibniz Institute for Baltic Sea Research, WarnemündeEngel, AnjaAnjaEngel0000-0002-1042-1955GEOMAR - Helmholtz Centre for Ocean Research KielPANGAEA2026air-sea interfaceamino acidsAphanizomenon sp.Baltic SeacarbohydratesCyanobacteriaNodularia spumigenaPhytoplankton bloomsea surface microlayerSurfactantssynechococcusEvent labelDate/Time of eventLATITUDELONGITUDEClassificationSamplingDepth zoneChlorophyll aChlorophyll a, standard deviationPicoplanktonNanoplanktonPhytoplankton, totalAspartic acid and AsparagineGlutamine and Glutamic acidSerineGlycineThreonineArginineAlaninegamma-Aminobutyric acidTyrosineValineIsoleucinePhenylalanineLeucineAmino acid, totalFucoseRhamnoseGalactosamineArabinoseGlucosamineGalactoseGlucoseMannose/XyloseGalacturonic acidGlucuronic acidCarbohydrates, total combinedSurfactantsCarbon, organic, totalCarbon, organic, total, standard deviationCTD/RosetteCTDFluorometer, Turner Designs, 10-AUFlow cytometryHigh Performance Liquid Chromatography (HPLC)High Performance anion-exchange chromatographyVoltammetry, Metrohm, 796 VA ComputraceTOC analyzer (Shimadzu)EMB295Elisabeth Mann BorgeseBiogeochemical processes and Air-sea exchange in the Sea-Surface microlayer (BASS)2022-07-06T16:29:40/2022-07-16T04:57:07Dataset10.1594/PANGAEA.9935741188 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalData access is restricted (moratorium, sensitive data, license constraints)This dataset comprises samples collected in the Eastern Gotland Basin (Central Baltic Sea) during the EMB295 CenBASE research cruise conducted from June 30th to July 19th 2022. Sea surface microlayer (SML) samples were collected using established methods, i.e. the glass plate and the Garrett screen. Reference samples from the underlying water (ULW) were collected at approximately 1 m depth using a manually deployed Niskin bottle. To characterize the biochemical composition of the SML and the ULW, water samples were collected twice daily for the analysis of total organic carbon (TOC), total amino acids (TAA), total combined carbohydrates (TCCHO), and surfactants (determined using phase-sensitive AC voltammetry). TOC was measured using a TOC analyser. High-performance anion-exchange chromatography coupled to pulsed amperometric detection (HPAEC-PAD) was performed for carbohydrate analysis. Amino acids were determined using a high-performance liquid chromatography (HPLC). Chlorophyll a samples were taken from the Niskin bottles at 1m depth (ULW) and analysed using a fluorometer from Turner Designs (Turner TD 10-AU005). Abundance and community composition of nano- and picophytoplankton (<=20µm) were determined by flow cytometry. Sampling stations were subsequently classified based on the abundance of microphytoplankton (>20 µm) and nano/picophytoplankton (≤20 µm).19.25142420.17611957.19142857.450808Baltic SeaGerman Research Foundationhttps://doi.org/10.13039/501100001659451574234FOR 5267 - Biogeochemical processes and Air-sea exchange in the Sea-Surface microlayer (BASS)