API src

Found 11 results.

Other language confidence: 0.531672292592589

Environmental parameters, including dissolved organic carbon and molecular indices derived from ultra-high-resolution mass spectrometry (FT-ICR-MS) and infrared spectroscopy (ATR-FTIR)

We studied dissolved organic matter (DOM) dynamics in the sea surface microlayer (SML) during a multidisciplinary mesocosm study at the Sea sURface Facility (SURF) of the Institute for Chemistry and Biology of the Marine Environment (ICBM) in Wilhelmshaven, Germany (53.5148 °N, 8.1463 °E). The study was conducted from 18 May to 16 June 2023 as part of the BASS research unit (Biogeochemical processes and Air-sea exchange in the Sea-Surface microlayer). This dataset contains environmental data, including dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and DOM molecular indices (MLBwL, Ibio, Iphoto, IDEG) calculated from ultrahigh-resolution mass spectrometry data (Fourier-transform ion cyclotron resonance mass spectrometer, FT-ICR-MS). Furthermore, we present attenuated total reflectance Fourier Transform Infrared (ATR-FTIR) data from representative samples for each bloom phase. General metadata from the multidisciplinary mesocosm study, including temperature, salinity and chlorophyll a, are provided in Bibi et al. on PANGAEA at the following link: doi:10.1594/PANGAEA.984101.

Dissolved organic matter composition in the sea surface microlayer during a Mesocosm study in Wilhelmshaven, Germany (FT-ICR-MS and ATR-FTIR), spring 2023

We studied dissolved organic matter (DOM) dynamics in the sea surface microlayer (SML) during a mesocosm study at the Sea sURface Facility (SURF) of the Institute for Chemistry and Biology of the Marine Environment (ICBM) in Wilhelmshaven, Germany (53.5148 °N, 8.1463 °E). The study was conducted from 18 May to 16 June 2023 as part of the multidisciplinary BASS research unit (Biogeochemical processes and Air-sea exchange in the Sea-Surface microlayer). SURF was filled with pretreated natural seawater from the nearby Jade Bay (53° 28' 42'' N, 8° 12' 15'' E) to replicate natural conditions. We selected this approach to examine the regrowth of surviving phytoplankton cells after the initial water treatments, simulating a native microbial community starting with almost no bioproduction or pre-existing bioproduction products. To induce and maintain the phytoplankton bloom, inorganic nitrogen, phosphorus, and silicate were added on May 26, May 31, and June 01, 2023. By that, we induced an algal bloom of Emiliania huxleyi and Cylindrotheca closterium. Water samples were collected using a glass plate for the SML and a tube at 40 cm depth for the underlying water (ULW). This dataset contains DOM molecular data from ultrahigh-resolution mass spectrometry (Fourier-transform ion cyclotron resonance mass spectrometer, FT-ICR-MS), molecular indices calculated from FT-ICR-MS data (Ibio, Iphoto, IDEG) and environmental data, including dissolved organic carbon (DOC) and dissolved organic nitrogen (DON). Furthermore, it contains attenuated total reflectance Fourier Transform Infrared (ATR-FTIR) data from representative samples for each bloom phase. By combining molecular analyses with nutrient and bloom-phase data, we highlight the in situ production of carbohydrate-like and laminarin-derived DOM as a significant contributor to SML composition. General metadata from the multidisciplinary mesocosm study, including temperature, salinity and chlorophyll a, are provided in Bibi et al. on PANGAEA at the following link: doi:10.1594/PANGAEA.984101.

Molecular DOM composition (relative peak intensities) obtained through ultra-high resolution mass spectrometry (FT-ICR-MS)

Here we present the dissolved organic matter (DOM) data of the sea surface microlayer (SML) and underlying water (ULW) during a multidisciplinary mesocosm study at the Sea sURface Facility (SURF) of the Institute for Chemistry and Biology of the Marine Environment (ICBM) in Wilhelmshaven, Germany (53.5148 °N, 8.1463 °E). The study was conducted from 18 May to 16 June 2023. Water samples were collected using a glass plate for the SML and a tube at a depth of 40 cm. DOM was extracted and desalinated by solid-phase extraction as described by Dittmar et al. (2008). The extracts were stored frozen in methanol until analysis. Aliquots were mixed with 50% ultrapure water (50:50 v/v) and diluted to a final carbon concentration of 2.5 ppm. DOM composition was analysed using a SolariX XR FT-ICR-MS (Bruker Daltonik GmbH, Bremen, Germany) with a 15 Tesla superconducting magnet and an electrospray ionisation source (ESI; Bruker Apollo II ion source) in negative ion mode. Data processing and molecular formula assignment were performed in ICBM-OCEAN, as described by Merder et al. (2020).

Dissolved organic matter composition from a large scale enclosure experiment

During the summer of 2015, we reproduced three levels of browning and seven levels of nutrients using water from lake Stechlin (North-East Germany). We applied ultra-high-resolution mass-spectrometry and dissolved organic matter optical properties to retrieve the composition of the DOM at different levels of resolutions. Using a network analysis approach, we found that molecular formulas clustering together share a common origin.

Stable carbon isotopes of sediment core MFM09-A5-UR

Average chain length of sediment core MFM09-A5-UR

Terrestrial aquatic ratios (based on C28, C26, C24, C16 and C14 (TAR(C24+C26+C28)/(C24+C26+C28+C14+C16)) fatty acids) of sediment core MFM09-A5-UR

Terrestrial aquatic ratios (based on C24 and C16 (TARC24/(C24+C16)) fatty acids) of sediment core MFM09-A5-UR

Terrestrial aquatic ratios (based on C26 and C16 (TAR=C26/(C26+C16) fatty acids) of sediment core MFM09-A5-UR

Ultra-high-resolution fatty acid data of sediment core MFM09-A5-UR from Lake Meerfelder Maar

The Younger Dryas was the final cold phase during the last deglaciation; it started with an abrupt cooling in the Northern Hemisphere within just a few years. However, the regional patterns of Younger Dryas cooling in the North Atlantic realm were complex and mechanistically not fully understood. We present sub-annually resolved fatty acid data from Meerfelder Maar covering the Allerød-Younger Dryas transition to revel forcing mechanisms behind the time-transgressive Younger Dryas cooling across the North Atlantic realm. Data were generated using Mass Spectrometry Imaging (MSI) on 65 cm long section from the MFM09-A5-UR core. MSI was performed using a 7T solarix XR Fourier transform-ion cyclotron resonance-mass spectrometer (FT-ICR-MS) coupled to a matrix-assisted laser desorption/ionization (MALDI) source equipped with a Smartbeam II laser (Bruker Daltonik, Bremen, Germany). We used average chain length (ACL) of long-chain fatty acids (C24, C26, C28) and three terrestrial aquatic ratios (TARs; TAR based on C26 and C16 (TAR=C26/(C26+C16)), TAR based on C24 and C16 (TARC24/(C24+C16)) and TAR based on C28, C26, C24, C16 and C14 (TAR(C24+C26+C28)/(C24+C26+C28+C14+C16)) fatty acids). Moreover, we present ACL based on gas chromatography data and stable carbon isotopes data from individual fatty acids (δ13C of C16, C24, C26, C28 and bishomohopanoic acid (δ13CBA)) from the same section in a lower resolution as supporting data.

1 2