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  • 1
    Publication Date: 2024-03-14
    Keywords: Calcium carbonate production of carbon; Calcium carbonate production of carbon, standard deviation; Coccolithophoridae, total; Cruise/expedition; DATE/TIME; DEPTH, water; Emiliania huxleyi; Incubation duration; LATITUDE; LONGITUDE; Method comment; Ocean and sea region; Percentage; Primary production of carbon; Primary production of carbon, standard deviation; Principal investigator; Reference/source; Station label; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 35037 data points
    Location Call Number Expected Availability
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  • 2
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    PANGAEA
    In:  Supplement to: Fragoso, Glaucia M; Poulton, Alex J; Yashayaev, Igor M; Head, Erica J H; Purdie, Duncan A (2016): Spring phytoplankton communities of the Labrador Sea (2005-2014): pigment signatures, photophysiology and elemental ratios. Biogeosciences Discussions, 43 pp, https://doi.org/10.5194/bg-2016-295
    Publication Date: 2024-03-18
    Description: The Labrador Sea is an ideal region to study the biogeographical, physiological and biogeochemical implications of phytoplankton communities due to sharp transitions of distinct water masses across its shelves and the central basin, intense nutrient delivery due to deep vertical mixing during winters and continual inflow of Arctic, Greenland melt and Atlantic waters. In this study, we provide a decadal assessment (2005?2014) of late spring/early summer phytoplankton communities from surface waters of the Labrador Sea based on pigment markers and CHEMTAX analysis, and their physiological and biogeochemical signatures. Diatoms were the most abundant group, blooming first in shallow mixed layers of haline-stratified Arctic shelf waters. Along with diatoms, chlorophytes co-dominated at the western end of the section (particularly in the polar waters of the Labrador Current (LC)), whilst Phaeocystis co-dominated in the east (modified polar waters of the West Greenland Current (WGC)). Pre-bloom conditions occurred in deeper mixed layers of the central Labrador Sea in May, where a mixed assemblage of flagellates (dinoflagellates, prasinophytes, prymnesiophytes, particularly coccolithophores, and chrysophytes/pelagophytes) occurred in low chlorophyll areas, succeeding to blooms of diatoms and dinoflagellates in thermally-stratified Atlantic waters in June. Light-saturated photosynthetic rates and saturation irradiance levels were higher at stations where diatoms were the dominant phytoplankton group (〉 70 %), as opposed to stations where flagellates were more abundant (from 40 % up to 70 %). Phytoplankton communities from the WGC (Phaeocystis and diatoms) had lower light-limited photosynthetic rates, with little evidence of photo-inhibition, indicating greater tolerance to a high light environment. By contrast, communities from the central Labrador Sea (dinoflagellates and diatoms), which bloomed later in the season (June), appeared to be more sensitive to high light levels. Ratios of accessory pigments (AP) to total chlorophyll a (TChl a) varied according to phytoplankton community composition, with polar phytoplankton (cold-water related) having lower AP to TChl a ratios. Phytoplankton communities associated with polar waters (LC and WGC) also had higher and more variable particulate organic carbon (POC) to particulate organic nitrogen (PON) ratios, suggesting the influence of detritus from freshwater input, derived from riverine, glacial and/or sea-ice meltwater. Long-term observational shifts in phytoplankton communities were not assessed in this study due to the short temporal frame (May to June) of the data. Nevertheless, these results have provided a baseline of current distributions and an evaluation of the biogeochemical role of spring phytoplankton communities in the Labrador Sea, which will improve our understanding of potential long-term responses of phytoplankton communities in high-latitude oceans to a changing climate.
    Keywords: (Diadinoxanthin + Diatoxanthin)/chlorophyll a ratio; 19-Butanoyloxyfucoxanthin; 19-Hexanoyloxyfucoxanthin; Alloxanthin; alpha-Carotene, beta,epsilon-Carotene; beta-Carotene, beta,beta-Carotene; Calculated; Campaign of event; Carbon, organic, particulate; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Carotenoid pigments; Chlorophyll a; Chlorophyll a, Chlorophyta; Chlorophyll a, Chrysophyta; Chlorophyll a, Cryptophycea; Chlorophyll a, Cyanobacteria; Chlorophyll a, Diatoms; Chlorophyll a, Dinoflagellata; Chlorophyll a, Phaeocystis; Chlorophyll a, Prasinophyta; Chlorophyll a, Prymnesiophyceae; Chlorophyll a, total; Chlorophyll b; Chlorophyll c; Chlorophyll c1+c2; Chlorophyll c3; Chlorophyllide a; Cluster number; Comment; CTD, Sea-Bird; CTD/Rosette; CTD-RO; Date/Time of event; Davis Strait; Day of study; DEPTH, water; Diadinoxanthin; Diadinoxanthin + Diatoxanthin; Diatoxanthin; Diatoxanthin/(Diadinoxanthin + Diatoxanthin) ratio; Element analyser CHNS/O, Perkin-Elmer 2400 II; Event label; Fluorometer, Turner Design, TD-700; Fucoxanthin; Greenland Sea; Gulf of St. Lawrence; High Performance Liquid Chromatography (HPLC); HUD2005-16; HUD-2005-16_L10; HUD-2005-16_L11; HUD-2005-16_L12B_2; HUD-2005-16_L13; HUD-2005-16_L14; HUD-2005-16_L15; HUD-2005-16_L16B_2; HUD-2005-16_L17; HUD-2005-16_L18; HUD-2005-16_L19; HUD-2005-16_L20B_2; HUD-2005-16_L21; HUD-2005-16_L22; HUD-2005-16_L23; HUD-2005-16_L24; HUD-2005-16_L25B_2; HUD-2005-16_L26; HUD-2005-16_L27_2; HUD-2005-16_L3; HUD-2005-16_L4; HUD-2005-16_L5; HUD-2005-16_L6_2; HUD-2005-16_L7; HUD-2005-16_L8; HUD-2005-16_L9; HUD2006-019; HUD-2006-019_Bio1_2; HUD-2006-019_Bio4_2; HUD-2006-019_L1_2; HUD-2006-019_L11; HUD-2006-019_L14B_2; HUD-2006-019_L18B_2; HUD-2006-019_L24B_2; HUD-2006-019_L25B_2; HUD-2006-019_L4_2; HUD-2006-019_L4.10_2; HUD-2006-019_L4.5_2; HUD-2006-019_L9B_3; HUD2007-011; HUD-2007-011_L10B_2; HUD-2007-011_L11; HUD-2007-011_L12; HUD-2007-011_L13; HUD-2007-011_L14; HUD-2007-011_L14B_2; HUD-2007-011_L15; HUD-2007-011_L16; HUD-2007-011_L17; HUD-2007-011_L17B_2; HUD-2007-011_L18; HUD-2007-011_L2.10; HUD-2007-011_L2.12B_2; HUD-2007-011_L2.13; HUD-2007-011_L2.14; HUD-2007-011_L2.15.5; HUD-2007-011_L2.18; HUD-2007-011_L2.19_2; HUD-2007-011_L2.20; HUD-2007-011_L2.8B_2; HUD-2007-011_L20; HUD-2007-011_L21; HUD-2007-011_L21B_2; HUD-2007-011_L22; HUD-2007-011_L23; HUD-2007-011_L24; HUD-2007-011_L25; HUD-2007-011_L26; HUD-2007-011_L27_2; HUD-2007-011_L4.5; HUD-2007-011_L5; HUD-2007-011_L8; HUD2008-009; HUD-2008-009_L1; HUD-2008-009_L10B_2; HUD-2008-009_L11; HUD-2008-009_L12; HUD-2008-009_L13; HUD-2008-009_L14; HUD-2008-009_L15B_2; HUD-2008-009_L16; HUD-2008-009_L17; HUD-2008-009_L18; HUD-2008-009_L19B_2; HUD-2008-009_L2; HUD-2008-009_L20; HUD-2008-009_L21; HUD-2008-009_L22B_2; HUD-2008-009_L23; HUD-2008-009_L24B_2; HUD-2008-009_L25; HUD-2008-009_L3; HUD-2008-009_L4_2; HUD-2008-009_L5; HUD-2008-009_L6; HUD-2008-009_L7; HUD-2008-009_L8; HUD-2008-009_L9; HUD2009-015; HUD-2009-015_BIO1_2; HUD-2009-015_BIO2_2; HUD-2009-015_BIO3_2; HUD-2009-015_L10B_2; HUD-2009-015_L11B_2; HUD-2009-015_L12; HUD-2009-015_L13; HUD-2009-015_L14; HUD-2009-015_L15B_2; HUD-2009-015_L16B_2; HUD-2009-015_L17; HUD-2009-015_L18; HUD-2009-015_L19; HUD-2009-015_L20; HUD-2009-015_L20B; HUD-2009-015_L21; HUD-2009-015_L22; HUD-2009-015_L23; HUD-2009-015_L24; HUD-2009-015_L25; HUD-2009-015_L26; HUD-2009-015_L27; HUD-2009-015_L28_2; HUD-2009-015_L7.5; HUD-2009-015_L8; HUD-2009-015_L9; HUD2010-014; HUD-2010-014_L1; HUD-2010-014_L10_2; HUD-2010-014_L11; HUD-2010-014_L12; HUD-2010-014_L13; HUD-2010-014_L14B_2; HUD-2010-014_L15; HUD-2010-014_L16; HUD-2010-014_L17; HUD-2010-014_L18B_2; HUD-2010-014_L19; HUD-2010-014_L20; HUD-2010-014_L21; HUD-2010-014_L23B_2; HUD-2010-014_L24; HUD-2010-014_L25; HUD-2010-014_L26; HUD-2010-014_L27; HUD-2010-014_L28; HUD-2010-014_L2a; HUD-2010-014_L3a; HUD-2010-014_L4a; HUD-2010-014_L5a; HUD-2010-014_L6a_2; HUD-2010-014_L7; HUD-2010-014_L8; HUD-2010-014_L9; HUD2011-009; HUD-2011-009_A3; HUD-2011-009_A4; HUD-2011-009_AB_8; HUD-2011-009_BIO3_3; HUD-2011-009_L0; HUD-2011-009_L1; HUD-2011-009_L10; HUD-2011-009_L11; HUD-2011-009_L11.5B_2; HUD-2011-009_L12; HUD-2011-009_L13; HUD-2011-009_L14B; HUD-2011-009_L15; HUD-2011-009_L17; HUD-2011-009_L19B_2; HUD-2011-009_L2; HUD-2011-009_L20; HUD-2011-009_L21; HUD-2011-009_L22; HUD-2011-009_L23.5_2; HUD-2011-009_L23B_2; HUD-2011-009_L24; HUD-2011-009_L25; HUD-2011-009_L26; HUD-2011-009_L27; HUD-2011-009_L28; HUD-2011-009_L3; HUD-2011-009_L4; HUD-2011-009_L5; HUD-2011-009_L6; HUD-2011-009_L7_2; HUD-2011-009_L8; HUD-2011-009_L9.5; HUD2012-001; HUD-2012-001_L1; HUD-2012-001_L10; HUD-2012-001_L11; HUD-2012-001_L12; HUD-2012-001_L13; HUD-2012-001_L14; HUD-2012-001_L15B; HUD-2012-001_L16; HUD-2012-001_L17; HUD-2012-001_L17.4; HUD-2012-001_L18B; HUD-2012-001_L19; HUD-2012-001_L2; HUD-2012-001_L21B; HUD-2012-001_L22; HUD-2012-001_L23; HUD-2012-001_L23.5; HUD-2012-001_L24; HUD-2012-001_L25; HUD-2012-001_L27; HUD-2012-001_L28; HUD-2012-001_L29; HUD-2012-001_L3; HUD-2012-001_L30; HUD-2012-001_L4; HUD-2012-001_L5; HUD-2012-001_L6; HUD-2012-001_L7; HUD-2012-001_L8; HUD-2012-001_L9; HUD2013-008; HUD-2013-008_B1; HUD-2013-008_B2; HUD-2013-008_B3; HUD-2013-008_B4; HUD-2013-008_B5; HUD-2013-008_L10; HUD-2013-008_L11; HUD-2013-008_L12; HUD-2013-008_L13; HUD-2013-008_L14.2; HUD-2013-008_L14B2; HUD-2013-008_L15; HUD-2013-008_L16; HUD-2013-008_L17_2; HUD-2013-008_L17B2; HUD-2013-008_L18; HUD-2013-008_L19; HUD-2013-008_L21; HUD-2013-008_L22; HUD-2013-008_L23; HUD-2013-008_L25; HUD-2013-008_L26; HUD-2013-008_L27; HUD-2013-008_L28B2; HUD-2013-008_L7; HUD-2013-008_L8; HUD-2013-008_L9; Hudson; Initial slope of the photosynthesis-irradiance curve; James Clark Ross; JR302; JR302_R11; JR302_R22; JR302_R23; JR302_R28; JR302_R33; JR302_R38; JR302_R42; JR302_R48; JR302_R49; JR302_R5; JR302_R56; JR302_R6; JR302_R62; JR302_R71; JR302_R75; JR302_R78; Labrador Sea; Latitude of event; Light intensity at half-saturation irradiance; Light intensity at saturation irradiance; Longitude of event; Maximum photosynthetic efficiency per chlorophyll a biomass; Mixed layer depth; Nitrate; Nitrate/Phosphate ratio; Nitrogen, organic, particulate; Peridinin; Phaeophytin; Phosphate; Photoinhibition in carbon normalized to chlorophyll a; Pigments, total; Pigments, total accessory; Prasinoxanthin; Salinity; Sample ID; SEAL AutoAnalyzer 3 HR (AA3 HR); Silicate; Silicate/Nitrate ratio; South Atlantic Ocean; Station label; Stratification index; Temperature, water; Violaxanthin; Zeaxanthin + Lutein
    Type: Dataset
    Format: text/tab-separated-values, 14654 data points
    Location Call Number Expected Availability
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  • 3
  • 4
    Publication Date: 2017-03-14
    Description: The Labrador Sea is an ideal region to study the biogeographical, physiological, and biogeochemical implications of phytoplankton community composition due to sharp transitions between distinct water masses across its shelves and central basin. We have investigated the multi-year (2005–2014) distributions of late spring and early summer (May to June) phytoplankton communities in the various hydrographic settings of the Labrador Sea. Our analysis is based on pigment markers (using CHEMTAX analysis), and photophysiological and biogeochemical characteristics associated with each phytoplankton community. Diatoms were the most abundant group, blooming first in shallow mixed layers of haline-stratified Arctic shelf waters. Along with diatoms, chlorophytes co-dominated at the western end of the section (particularly in the polar waters of the Labrador Current (LC)), whilst Phaeocystis co-dominated in the east (modified polar waters of the West Greenland Current (WGC)). Pre-bloom conditions occurred in deeper mixed layers of the central Labrador Sea in May, where a mixed assemblage of flagellates (dinoflagellates, prasinophytes, prymnesiophytes, particularly coccolithophores, and chrysophytes/pelagophytes) occurred in low-chlorophyll areas, succeeding to blooms of diatoms and dinoflagellates in thermally stratified Atlantic waters in June. Light-saturated photosynthetic rates and saturation irradiance levels were highest at stations where diatoms were the dominant phytoplankton group ( 〉  70 % of total chlorophyll a), as opposed to stations where flagellates were more abundant (from 40 up to 70 % of total chlorophyll a). Phytoplankton communities from the WGC (Phaeocystis and diatoms) had lower light-limited photosynthetic rates, with little evidence of photoinhibition, indicating greater tolerance to a high light environment. By contrast, communities from the central Labrador Sea (dinoflagellates and diatoms), which bloomed later in the season (June), appeared to be more sensitive to high light levels. Ratios of accessory pigments (AP) to total chlorophyll a (TChl a) varied according to phytoplankton community composition, with polar phytoplankton (cold-water related) having lower AP  :  TChl a. Polar waters (LC and WGC) also had higher and more variable particulate organic carbon (POC) to particulate organic nitrogen (PON) ratios, suggesting the influence of detritus from freshwater input, derived from riverine, glacial, and/or sea ice meltwater. Long-term observational shifts in phytoplankton communities were not assessed in this study due to the short temporal frame (May to June) of the data. Nevertheless, these results add to our current understanding of phytoplankton group distribution, as well as an evaluation of the biogeochemical role (in terms of C  :  N ratios) of spring phytoplankton communities in the Labrador Sea, which will assist our understanding of potential long-term responses of phytoplankton communities in high-latitude oceans to a changing climate.
    Print ISSN: 1726-4170
    Electronic ISSN: 1726-4189
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 5
  • 6
  • 7
  • 8
    Publication Date: 2016-07-22
    Description: The Labrador Sea is an ideal region to study the biogeographical, physiological and biogeochemical implications of phytoplankton communities due to sharp transitions of distinct water masses across its shelves and the central basin, intense nutrient delivery due to deep vertical mixing during winters and continual inflow of Arctic, Greenland melt and Atlantic waters. In this study, we provide a decadal assessment (2005–2014) of late spring/early summer phytoplankton communities from surface waters of the Labrador Sea based on pigment markers and CHEMTAX analysis, and their physiological and biogeochemical signatures. Diatoms were the most abundant group, blooming first in shallow mixed layers of haline-stratified Arctic shelf waters. Along with diatoms, chlorophytes co-dominated at the western end of the section (particularly in the polar waters of the Labrador Current (LC)), whilst Phaeocystis co-dominated in the east (modified polar waters of the West Greenland Current (WGC)). Pre-bloom conditions occurred in deeper mixed layers of the central Labrador Sea in May, where a mixed assemblage of flagellates (dinoflagellates, prasinophytes, prymnesiophytes, particularly coccolithophores, and chrysophytes/pelagophytes) occurred in low chlorophyll areas, succeeding to blooms of diatoms and dinoflagellates in thermally-stratified Atlantic waters in June. Light-saturated photosynthetic rates and saturation irradiance levels were higher at stations where diatoms were the dominant phytoplankton group (〉 70 %), as opposed to stations where flagellates were more abundant (from 40 % up to 70 %). Phytoplankton communities from the WGC (Phaeocystis and diatoms) had lower light-limited photosynthetic rates, with little evidence of photo-inhibition, indicating greater tolerance to a high light environment. By contrast, communities from the central Labrador Sea (dinoflagellates and diatoms), which bloomed later in the season (June), appeared to be more sensitive to high light levels. Ratios of accessory pigments (AP) to total chlorophyll a (TChl a) varied according to phytoplankton community composition, with polar phytoplankton (cold-water related) having lower AP to TChl a ratios. Phytoplankton communities associated with polar waters (LC and WGC) also had higher and more variable particulate organic carbon (POC) to particulate organic nitrogen (PON) ratios, suggesting the influence of detritus from freshwater input, derived from riverine, glacial and/or sea-ice meltwater. Long-term observational shifts in phytoplankton communities were not assessed in this study due to the short temporal frame (May to June) of the data. Nevertheless, these results have provided a baseline of current distributions and an evaluation of the biogeochemical role of spring phytoplankton communities in the Labrador Sea, which will improve our understanding of potential long-term responses of phytoplankton communities in high-latitude oceans to a changing climate.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 9
    Publication Date: 2018-05-18
    Description: The biological production of calcium carbonate (CaCO3), a process termed calcification, is a key term in the marine carbon cycle. A major planktonic group responsible for such pelagic CaCO3 production (CP) are the coccolithophores, single-celled haptophytes that inhabit the euphotic zone of the ocean. Satellite-based estimates of areal CP are limited to open-ocean waters, with current algorithms utilising the unique optical properties of the cosmopolitan bloom-forming species Emiliania huxleyi, whereas little understanding of the optical properties and environmental responses by species other than E. huxleyi are currently available to parameterise algorithms or models. To aid future areal estimations and validate future modelling efforts we have constructed a database of 2765 CP measurements, the majority of which were measured using 12 to 24h incorporation of radioactive carbon (14C) into acid-labile inorganic carbon (CaCO3). We present data collated from over 30 studies covering the period from 1991 to 2015, sampling the Atlantic, Pacific, Indian, Arctic and Southern oceans. Globally, CP in surface waters (
    Electronic ISSN: 1866-3591
    Topics: Geosciences
    Published by Copernicus
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  • 10
    Publication Date: 2018-10-16
    Description: The biological production of calcium carbonate (CaCO3), a process termed calcification, is a key term in the marine carbon cycle. A major planktonic group responsible for such pelagic CaCO3 production (CP) is the coccolithophores, single-celled haptophytes that inhabit the euphotic zone of the ocean. Satellite-based estimates of areal CP are limited to surface waters and open-ocean areas, with current algorithms utilising the unique optical properties of the cosmopolitan bloom-forming species Emiliania huxleyi, whereas little understanding of deep-water ecology, optical properties or environmental responses by species other than E. huxleyi is currently available to parameterise algorithms or models. To aid future areal estimations and validate future modelling efforts we have constructed a database of 2765 CP measurements, the majority of which were measured using 12 to 24 h incorporation of radioactive carbon (14C) into acid-labile inorganic carbon (CaCO3). We present data collated from over 30 studies covering the period from 1991 to 2015, sampling the Atlantic, Pacific, Indian, Arctic and Southern oceans. Globally, CP in surface waters ( 
    Print ISSN: 1866-3508
    Electronic ISSN: 1866-3516
    Topics: Geosciences
    Published by Copernicus
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