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Photobiological Effects on Ice Algae of a Rapid Whole-Fjord Loss of Snow Cover during Spring Growth in Kangerlussuaq, a West Greenland Fjord by Sorrell, Brian K. (author);Hawes, Ian (author);Stratmann, Tanja (author);Lund-Hansen, Lars Chresten (author) is a Engineering article available to read on EtoBox.

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Snow cover on sea ice is the most important factor controlling light availability for sea ice algae, but it is predicted by climate models to become more variable and stochastic. Here, we document effects of a sudden, complete loss of the entire snow cover on first-year sea ice at Kangerlussuaq Fjord, West Greenland, due to a natural Föhn wind event that caused a ca. 17 °C air temperature increase over 36 h. We applied Imaging-PAM fluorometry to examine effects of snow cover on algal distribution and photobiology and observed a rapid decrease in algal biomass associated with loss of the skeletal ice crystal layer on the underside of the ice that had supported most of the visible algae. Furthermore, the remaining algae were photobiologically stressed, as seen in a significant decrease in the dark-acclimated fluorescence yield (ΦPSII\_max) from 0.55 before snow loss to 0.41 after. However, recovery in the dark suggested that non-photosynthetic quenching was successfully dissipating excess energy in the community and that there was little photodamage. An observed decrease in the photosynthetic efficiency α from 0.22 to 0.16 μmol é m−2 s−1 is therefore likely to be due to photoacclimat

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Author

Sorrell, Brian K. (author);Hawes, Ian (author);Stratmann, Tanja (author);Lund-Hansen, Lars Chresten (author)

Publisher

MDPI AG

Published

2021

Language

EN

Field

Engineering (Physical Sciences)