scholarly journals Modeling Arctic sea-ice algae: Physical drivers of spatial distribution and algae phenology

2017 ◽  
Vol 122 (9) ◽  
pp. 7466-7487 ◽  
Author(s):  
Giulia Castellani ◽  
Martin Losch ◽  
Benjamin A. Lange ◽  
Hauke Flores
Keyword(s):  
Spatial Distribution ◽  
Sea Ice ◽  
Arctic Sea Ice ◽  
Ice Algae ◽  
Sea Ice Algae ◽  
Arctic Sea

Arctic sea ice algae differ markedly from phytoplankton in their ecophysiological characteristics

2021 ◽  
Author(s):  
AC Kvernvik ◽  
CJM Hoppe ◽  
M Greenacre ◽  
S Verbiest ◽  
JM Wiktor ◽  
...  
Keyword(s):  
Sea Ice ◽  
Arctic Sea Ice ◽  
Ice Algae ◽  
Sea Ice Algae ◽  
Arctic Sea

scholarly journals Monitoring abiotic degradation in sinking versus suspended Arctic sea ice algae during a spring ice melt using specific lipid oxidation tracers

2016 ◽  
Vol 98 ◽  
pp. 82-97 ◽  
Author(s):  
Jean-François Rontani ◽  
Simon T. Belt ◽  
Thomas A. Brown ◽  
Rémi Amiraux ◽  
Michel Gosselin ◽  
...  
Keyword(s):  
Sea Ice ◽  
Lipid Oxidation ◽  
Arctic Sea Ice ◽  
Ice Algae ◽  
Ice Melt ◽  
Sea Ice Algae ◽  
Abiotic Degradation ◽  
Arctic Sea ◽  
Specific Lipid

scholarly journals Pigment composition and photoprotection of Arctic sea ice algae during spring

2017 ◽  
Vol 585 ◽  
pp. 49-69 ◽  
Author(s):  
V Galindo ◽  
M Gosselin ◽  
J Lavaud ◽  
CJ Mundy ◽  
B Else ◽  
...  
Keyword(s):  
Sea Ice ◽  
Arctic Sea Ice ◽  
Ice Algae ◽  
Pigment Composition ◽  
Sea Ice Algae ◽  
Arctic Sea

Effects of increased irradiance on biomass, photobiology, nutritional quality, and pigment composition of Arctic sea ice algae

2020 ◽  
Vol 648 ◽  
pp. 95-110 ◽  
Author(s):  
LC Lund-Hansen ◽  
I Hawes ◽  
K Hancke ◽  
N Salmansen ◽  
JR Nielsen ◽  
...  
Keyword(s):  
Sea Ice ◽  
Primary Production ◽  
Snow Cover ◽  
Nutritional Quality ◽  
Light Availability ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Ice Algae ◽  
Sea Ice Algae ◽  
Arctic Sea

Ice algae are key contributors to primary production and carbon fixation in the Arctic, and light availability is assumed to limit their growth and productivity. We investigated photo-physiological responses in sea ice algae to increased irradiance during a spring bloom in West Greenland. During a 14 d field experiment, light transmittance through sea ice was manipulated to provide 3 under-ice irradiance regimes: low (0.04), medium (0.08), and high (0.16) transmittances. Chlorophyll a decreased with elevated light availability relative to the control. Maximum dark-adapted photosynthetic efficiency (ΦPSII_max) showed an initially healthy and productive ice algae community (ΦPSII_max > 0.6), with ΦPSII_max decreasing markedly under high-light treatments. This was accompanied by a decrease in the light utilization coefficient (α) and photosynthetic capacity (maximum relative electron transfer rate), and a decrease in the ratio of mono- to polyunsaturated fatty acids. This was partly explained by a corresponding increase of photoprotective pigments (diadinoxanthin and diatoxanthin), and a development of mycosporine-like amino acids as identified from a distinctive spectral absorption peak at 360 nm. After 14 d, in situ fluorescence imaging revealed significant differences in ΦPSII_max between treatments of dark-adapted cells (i.e. those sampled before sunrise and after sunset), during diel cycles, with clear chronic photoinhibition in high and medium treatments. Data demonstrate the high sensitivity of spring-blooming Arctic sea ice algae to elevated irradiance caused by loss of snow cover. The predicted loss of snow cover on landfast ice will negatively impact ice algae, their potential primary production, and nutritional quality for higher trophic levels.

scholarly journals Bioconditioning of Arctic Waters and Stimulation of Arctic Phytoplankton by Sea Ice Algae: Vulnerability to Increased Light

ARCTIC ◽  
2020 ◽  
Vol 73 (1) ◽  
pp. 114-117
Author(s):  
Spencer Apollonio
Keyword(s):  
Sea Ice ◽  
Early Summer ◽  
Arctic Sea Ice ◽  
Phytoplankton Production ◽  
Ice Algae ◽  
Light Conditions ◽  
Low Light ◽  
Sea Ice Algae ◽  
Arctic Sea ◽  
Summer Growth

Arctic sea ice algae produce extracellular organic products, which, as bioconditioners of seawater, may stimulate early summer growth of pelagic, under-sea-ice phytoplankton in low light and low temperature conditions. Sea ice algae are inhibited or decline in numbers if prematurely exposed to high light conditions, thereby reducing their ability to produce bioconditioners. As climate change creates an early reduction or removal of snow and sea ice cover, the result may be a decrease in primary phytoplankton production.

scholarly journals Windows in Arctic sea ice: Light transmission and ice algae in a refrozen lead

2017 ◽  
Vol 122 (6) ◽  
pp. 1486-1505 ◽  
Author(s):  
Hanna M. Kauko ◽  
Torbjørn Taskjelle ◽  
Philipp Assmy ◽  
Alexey K. Pavlov ◽  
C. J. Mundy ◽  
...  
Keyword(s):  
Sea Ice ◽  
Light Transmission ◽  
Arctic Sea Ice ◽  
Ice Algae ◽  
Arctic Sea

scholarly journals Improving the spatial distribution of modeled Arctic sea ice thickness

2005 ◽  
Vol 32 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Paul A. Miller ◽  
Seymour W. Laxon ◽  
Daniel L. Feltham
Keyword(s):  
Spatial Distribution ◽  
Sea Ice ◽  
Arctic Sea Ice ◽  
Ice Thickness ◽  
Sea Ice Thickness ◽  
Arctic Sea ◽  
Arctic Sea Ice Thickness

scholarly journals Production of Chromophoric Dissolved Organic Matter (CDOM) in Laboratory Cultures of Arctic Sea Ice Algae

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 926
Author(s):  
Guiju Li ◽  
Huixiang Xie ◽  
Guisheng Song ◽  
Michel Gosselin
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sea Ice ◽  
Chlorophyll A ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Chromophoric Dissolved Organic Matter ◽  
Ice Algae ◽  
Production Rates ◽  
Arctic Sea

Chromophoric dissolved organic matter (CDOM) is highly enriched in bottom sea ice in the Arctic during ice algal blooms, giving rise to multifaceted ecological implications in both the sea ice and the underlying seawater. We conducted laboratory culture incubations to assess the potential role of ice algae in the accumulation of CDOM in Arctic sea ice. Non-axenic monocultures of Attheya septentrionalis and Nitzschia frigida and a natural ice algal assemblage (NIAA) were grown at 4 °C in an f/2 medium under cool white fluorescent light. Culture samples were collected several days apart throughout the exponential, stationary, and senescent phases, and analyzed for CDOM absorbance, chlorophyll a, and bacterial cell abundance. The cultures displayed apparent specific growth rates of algal and bacterial cells comparable to those in the field. Accumulations of CDOM were observed in all cultures during the time-course incubations, with the senescent phase showing the largest accumulations and the highest production rates. The senescent-phase production rate for NIAA was ~40% higher than that for A. septentrionalis. The chlorophyll a-normalized CDOM production rates in the cultures are comparable to those reported for Arctic first-year sea ice. The absorption spectra of CDOM in the cultures exhibited characteristic short-ultraviolet shoulders similar to those previously identified in sea ice. This study demonstrates that ice algal-derived CDOM can account for the springtime accumulation of CDOM in Arctic sea ice.

The spatial distribution of solar radiation under a melting Arctic sea ice cover

2011 ◽  
Vol 38 (22) ◽  
pp. n/a-n/a ◽  
Author(s):  
Karen E. Frey ◽  
Donald K. Perovich ◽  
Bonnie Light
Keyword(s):  
Spatial Distribution ◽  
Solar Radiation ◽  
Sea Ice ◽  
Ice Cover ◽  
Arctic Sea Ice ◽  
Arctic Sea
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