Abstract
Understanding the flow of solar energy into ecosystems is fundamental to understanding ecosystem productivity and dynamics. To gain a better understanding of this fundamental process in the Antarctic winter sea ice, we produced a model that estimates the time-integrated exposure of seasonal Antarctic sea ice to PAR through the use of remotely sensed sea ice concentrations, sea ice movement and spatially distributed PAR calculations that account for cloud cover and have applied this model over the past three decades. The resulting spatially distributed estimates of sea ice exposure to PAR by mid-winter are evaluated in context of changes in the timing of sea ice formation that have been documented along the Western Antarctic Peninsula (WAP) region and its potential effects on the variation (seasonal and inter-annual) in the accumulation of sea ice algae in this region. The analysis shows the ice pack is likely to have large inter-annual variations (10–100 fold) in productivity throughout the autumn to winter transition in the sea ice along the WAP. Moreover, the pack ice is likely to have spatial structure in regards to biological processes that cannot be determined from analysis of sea ice concentration information alone. The resulting inter-annual variations in winter processes are likely to affect the dynamics of Antarctic krill (Euphausia superba).
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Abbreviations
- PAR:
-
Photosynthetically active radiation
- TIEP:
-
Time-integrated exposure to PAR
- SIMCOs:
-
Sea ice microbial communities
- WAP:
-
Western Antarctic Peninsula
- Chl a :
-
chlorophyll a
- SO-GLOBEC:
-
Southern Ocean Global Ocean Ecosystems Dynamics
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Acknowledgments
This research was supported by NSF-Office of Polar Programs grants ANT-0529666, ANT-0529087, and ANT-0528728. We thank the many contributors to engaging discussions regarding seasonal timing and potential ecosystem response over the past seasons.
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Fritsen, C.H., Memmott, J.C., Ross, R.M. et al. The timing of sea ice formation and exposure to photosynthetically active radiation along the Western Antarctic Peninsula. Polar Biol 34, 683–692 (2011). https://doi.org/10.1007/s00300-010-0924-7
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DOI: https://doi.org/10.1007/s00300-010-0924-7