LTER HAUSGARTEN data on biogenic sediment compounds from 1999 to 2015
Description
The Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) established the LTER (Long-Term Ecological Research) observatory HAUSGARTEN in the Fram Strait between NE Greenland and the Svalbard archipelago to detect and track the effects of large-scale environmental changes on the marine ecosystem in the transition zone between the northern North Atlantic and the central Arctic Ocean. Since 1999, repeated sampling in the water column and on the seafloor during annual expeditions during the summer months has been complemented by continuous sampling and measurements throughout the year using autonomous instruments on moored devices. Time series studies at the HAUSGARTEN observatory provide insights into processes and dynamics within an Arctic marine ecosystem and serve as a baseline for further investigations of ongoing changes in the Fram Strait (Soltwedel et al. 2016, doi: 10.1016/j.ecolind.2015.10.001). The data presented here were analysed from benthic samples collected at stations of the deep-sea observatory LTER HAUSGARTEN between 1999 and 2015. The data include biochemical analyses of sediment samples to estimate the input of phytodetrital matter to the seafloor as a food/energy source and to assess the activities and biomasses of the small sediment-inhabiting biota (for analytical methods see Hasemann et al., 2013, doi: 10.1080/17451000.2012.739694).
Files
Steps to reproduce
Sampling was performed using a Multiple Corer equipped with 10 cm internal diameter tubes. For each parameter, the top five centimetres of the sediments were sub-sampled from three different corer tubes for three parallel samples each. Syringes with cut ends of 2 cm or 1.2 cm internal diameter were used for subsampling. All samples were cut into 1 cm sediment layers (0-1 cm, 1-2 cm, 2-3 cm, 3-4 cm, 4-5 cm) and the sediment layers were analysed separately for each parameter. Parameters subsampled with 2cm internal Ø syringes LossOnIgnition: loss on ignition (proxy for total organic matter in the sediment; %) AFDW: ash-free dry weight of sediment (proxy for total organic content in sediment, weight of sediment after combustion; µg) Lipid: sediment bound phospholipids (proxy for microbial biomass in the sediment; nmol/ml) Parameters subsampled with 1.2 cm internal Ø syringes chla & phaeo: amount of phytodetrital matter in the sediments (quantified as chlorophyll a (chla) and its degradation products (phaeopigments, phaeo); µg/ml) Protein: particulate proteins in the sediments (bulk of living and dead biomass in sediments; µg/ml) FDA: potential bacterial exoenzymatic hydrolytic activity in sediments (using fluorescein diacetate (FDA) as substrate; nmol/ml x h-1) Bacterial number: number of bacterial cells in the sediments (n x 10 ^8) Bacterial biomass: volume of bacterial cells (fgC/cell) Explanation of abbreviations: Cruise: Cruise number of Polarstern (PS) and Marian S. Merian (MSM) cruises Station: Station number of the respective cruise Sample-ID: Multiple Corer sampling number of the respective station Date: Date of sampling Latitude/Longitude: Geographic coordinates in decimal degrees of the sampled HAUSGARTEN stations Water depth: Water depth (m) of the sampled HAUSGARTEN station Subsample (parallel): Name of the subsampled parallels for each parameter. Sediment Depth: Sediment layers analysed for each parameter (1 = 0-1 cm, 2 = 1-2 cm, 3 = 2-3 cm, 4 = 3-4 cm, 5= 4-5 cm sediment depth). Empty cells: no measurements