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  • 1
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    Average nutrient concentration, and growth characteristics of bacteria during USCGC Healy cruises in 2002 and 2004 (2009)
    PANGAEA
    In:  Supplement to: Kirchman, David L; Hill, Victoria; Cottrell, Matthew T; Gradinger, Rolf; Malmstrom, Rex R; Parker, Alexander E (2009): Standing stocks, production, and respiration of phytoplankton and heterotrophic bacteria in the western Arctic Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 56(17), 1237-1248, https://doi.org/10.1016/j.dsr2.2008.10.018
    Details
    Publication Date: 2023-12-13
    Description: Standing stocks and production rates for phytoplankton and heterotrophic bacteria were examined during four expeditions in the western Arctic Ocean (Chukchi Sea and Canada Basin) in the spring and summer of 2002 and 2004. Rates of primary production (PP) and bacterial production (BP) were higher in the summer than in spring and in shelf waters than in the basin. Most surprisingly, PP was 3-fold higher in 2004 than in 2002; ice-corrected rates were 1581 and 458 mg C/m**2/d respectively, for the entire region. The difference between years was mainly due to low ice coverage in the summer of 2004. The spatial and temporal variation in PP led to comparable variation in BP. Although temperature explained as much variability in BP as did PP or phytoplankton biomass, there was no relationship between temperature and bacterial growth rates above about 0°C. The average ratio of BP to PP was 0.06 and 0.79 when ice-corrected PP rates were greater than and less than 100 mg C/m**2/d, respectively; the overall average was 0.34. Bacteria accounted for a highly variable fraction of total respiration, from 3% to over 60% with a mean of 25%. Likewise, the fraction of PP consumed by bacterial respiration, when calculated from growth efficiency (average of 6.9%) and BP estimates, varied greatly over time and space (7% to 〉500%). The apparent uncoupling between respiration and PP has several implications for carbon export and storage in the western Arctic Ocean.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Physicochemical sea ice and water characteristics near Point Barrow 2005-2006 (2009)
    PANGAEA
    In:  Supplement to: Manes, Sarah Story; Gradinger, Rolf (2009): Small scale vertical gradients of Arctic ice algal photophysiological properties. Photosynthesis Research, 102(1), 53-66, https://doi.org/10.1007/s11120-009-9489-0
    Details
    Publication Date: 2023-12-13
    Description: Photosynthetic parameters of phytoplankton and sea ice algae from landfast sea ice of the Chukchi Sea off Point Barrow, Alaska, were assessed in spring 2005 and winter through spring 2006 using Pulse Amplitude Modulated (PAM) fluorometry including estimates of maximum quantum efficiency (Fv/Fm), maximum relative electron transport rate (rETRmax), photosynthetic efficiency (alpha), and the photoadaptive index (Ek). The use of centrifuged brine samples allowed to document vertical gradients in ice algal acclimation with 5 cm vertical resolution for the first time. Bottom ice algae (0-5 cm from ice-water interface) expressed low Fv/Fm (0.331-0.426) and low alpha (0.098-0.130 /(µmol photons/m**2/s)) in December. Fv/Fm and alpha increased in March and May (0.468-0.588 and 0.141-0.438 /(µmol photons/m**2/s), respectively) indicating increased photosynthetic activity. In addition, increases in rETRmax (3.3-16.4 a.u.) and Ek (20-88 µmol photons/m**2/s) from December to May illustrates a higher potential for primary productivity as communities become better acclimated to under-ice light conditions. In conclusion, photosynthetic performance by ice algae (as assessed by PAM fluorometry) was tightly linked to sea ice salinity, temperature, and inorganic nutrient concentrations (mainly nitrogen).
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 6 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Table 2) Nutrient concentration of the euphotic zone during USCGC Healy cruises in 2002 and 2004, western Arctic Ocean (2009)
    PANGAEA
    Details
    Publication Date: 2024-03-08
    Keywords: Ammonium; Ammonium, standard deviation; Chukchi Sea; DATE/TIME; Date/time end; Depth, bottom/max; Depth, top/min; Event label; Healy; HLY0201; HLY-02-01; HLY0203; HLY-02-03; HLY0402; HLY-04-02; HLY0403; HLY-04-03; Ice coverage; Location; MULT; Multiple investigations; Nitrate; Nitrate, standard deviation; Number; Phosphate; Phosphate, standard deviation; Season; Silicate; Silicate, standard deviation; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 233 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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