http://bolin.su.se/data/oden-ao-2018-algal-pigment-1 Giacomo DiTullio, Peter Lee, Nicole Schanke NSF Arctic Data Center 2021 Datafile Marine Ecosystems Ocean biology and chemistry Arctic Ocean AO18 AO2018 Phytoplankton community Phytoplankton pigments Icebreaker Oden Earth science > Oceans > Ocean chemistry > Pigments Nicole Schanke 2021-03-22T13:00:09+00:00 English 1 The included dataset contains algal pigment concentrations from samples collected during the Arctic Ocean 2018 expedition. These data provide estimates of phytoplankton community biomass and composition, as taxonomic groups can be estimated by the presence of a few indicating pigments. Because most of these samples were collected in the same location, but over time, we begin to gain insight into the shift of the phytoplankton community composition from the summer maximal biomass (August) to the declining community as autumn conditions result in lower nutrient and light levels and increased ice cover (September). Over the course of this expedition, CTD casts were made to collect samples from 5-200 meters, to sample the photic zone. Casts were made at the marginal ice zone, as well as on an almost-daily basis at the mooring location in the high Arctic Ocean. Water samples collected were filtered (GF/F) and frozen until HPLC analysis was preformed. HPLC protocol involves an overnight extraction in acetone before being analyzed on an Agilent 1100 HPLC system equipped with an autosampler, photodiode array and fluorescence detectors. Pigment concentrations were determined using standard peak integration procedures with Agilent's Chemstation software. The dataset is included in one comma-separated values (csv) file. Data were collected during the Arctic Ocean 2018 expedition on board the Swedish icebreaker (I/B) Oden, which was organized by the [Swedish Polar Research Secretariat](https://polarforskningsportalen.se/en/arctic/expeditions/arctic-ocean-2018). The data in this dataset are the same as in DiTullio and Lee (2019) published by the Arctic Data Center (see References) under the Creative Commons Universal 1.0 Public Domain Dedication.