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Such underice blooms cannot be detected from space; thus, methods for autonomous underice measurements are critically needed to extend observations beyond ship\u2010based surveys. One central aspect of the ecology of these blooms is whether they were advected from open\u2010water areas or were able to develop below the ice cover under typically low light conditions. The photoacclimation state of the bloom can provide clues about the growth conditions and therefore its origin. Here we investigate the photoacclimation state of a <jats:styled-content style=\"fixed-case\"><jats:italic>Phaeocystis pouchetii<\/jats:italic><\/jats:styled-content>\u2010dominated underice bloom in the Arctic Ocean using ratios of photoprotective carotenoids (PPC) to photosynthetic carotenoids (PSC) and chlorophyll <jats:italic>a<\/jats:italic>. The pigment proxies indicate local growth under the ice pack. Furthermore, a method using in situ light absorption measurements to estimate the PPC:PSC ratio was in agreement with the pigment data. The slope of in situ phytoplankton absorption between 488 and 532\u00a0nm, affected by both PPC and PSC, had a significant linear relationship to the PPC:PSC ratio, indicating that prediction of photoacclimation state can be obtained from absorption profiles. We also review, with regard to the pigment function, different ways of grouping pigments into PPC or PSC applied in previous studies. Although more validation data sets are needed to assess the impact of pigment packaging on the relationship between PPC:PSC and absorption measurement slopes, our study shows the potential for using in situ absorption measurements to collect information about phytoplankton physiology below sea ice.<\/jats:p>","DOI":"10.1029\/2018jc014777","type":"journal-article","created":{"date-parts":[[2019,2,15]],"date-time":"2019-02-15T11:25:17Z","timestamp":1550229917000},"page":"1750-1762","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Photoacclimation State of an Arctic Underice Phytoplankton Bloom"],"prefix":"10.1029","volume":"124","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3384-6454","authenticated-orcid":false,"given":"Hanna M.","family":"Kauko","sequence":"first","affiliation":[{"name":"Norwegian Polar Institute, Fram Centre  Troms\u00f8 Norway"},{"name":"Trondheim Biological Station, Department of Biology Norwegian University of Science and Technology  Trondheim Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1978-5368","authenticated-orcid":false,"given":"Alexey K.","family":"Pavlov","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute, Fram Centre  Troms\u00f8 Norway"},{"name":"Institute of Oceanology Polish Academy of Sciences  Sopot Poland"},{"name":"Akvaplan\u2010niva, Fram Centre  Troms\u00f8 Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2463-5903","authenticated-orcid":false,"given":"Geir","family":"Johnsen","sequence":"additional","affiliation":[{"name":"Centre for Autonomous Marine Operations and Systems, Trondheim Biological Station, Department of Biology Norwegian University of Science and Technology  Trondheim Norway"},{"name":"Department of Arctic Biology University Centre in Svalbard  Longyearbyen Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5035-4347","authenticated-orcid":false,"given":"Mats A.","family":"Granskog","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute, Fram Centre  Troms\u00f8 Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1531-1664","authenticated-orcid":false,"given":"Ilka","family":"Peeken","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research  Bremerhaven Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8241-7541","authenticated-orcid":false,"given":"Philipp","family":"Assmy","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute, Fram Centre  Troms\u00f8 Norway"}]}],"member":"13","published-online":{"date-parts":[[2019,3,18]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbabio.2012.05.006"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps10107"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.3354\/meps11562"},{"issue":"28","key":"e_1_2_6_5_1","article-title":"Sea ice algal biomass and physiology in the Amundsen Sea, Antarctica","volume":"2","author":"Arrigo K. 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