Preliminary investigation of growth and photosynthesis of sea ice algae during winter
Entry ID:
ASAC_832
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Summary
Abstract:
Microalgal assemblages associated with the winter Antarctic pack ice sheet were examined for photosynthesis-irradiance characteristics in relation to light availability. Pack ice, the dominant form of sea ice in the Southern Ocean, and the underlying water column were sampled from a site, approximately 150 nautical miles north of the French base - Dumont d'Urville, during Voyage 1 of RSV Aurora ... Australis for the 1995-1996 season. Microalgal cell concentrations in first-year pack ice and the underlying water column were extremely low (~100 to 1000 cells per litre) in comparison to the multi-year site, where the ice was stained brown due to high concentrations of microalgae dominated by pennate and centric diatoms. P-I analyses could not determine whether Antarctic winter pack ice microalgae or phytoplankton were actively photosynthesising in situ during the study period, because analytical temperatures differed from those in situ. However, the relatively high vertebrate and invertebrate activity noted in the vicinity of brown pack ice indicated that established microalgal assemblages associated with multi-year ice were supporting secondary production during the winter months. Due to a mishap during pigment extraction, it was considered inappropriate to use the Chl a data to standardise the parameters describing photosynthesis (P max, alpha). Relative Chl a levels indicated that biomass levels were higher in the pack ice compared to the underlying water column, and within the first-year ice sheet the biomass was generally concentrated in the bottom layers. As expected, the maximum photosynthetic capacities (P max) reflected the trend noted in Chl a distribution in both the first-year ice sheet and the water column. The relatively low Ik values observed in first-year pack ice indicate extreme shade adaptation. In comparison, under-ice phytoplankton generally displayed higher Ik. Photoinhibition was noted in all first-year ice samples displaying photosynthetic activity and most phytoplankton assemblages. The snow-free, multi-year ice at Brown Sugar displayed the highest P max and biomass values. High levels of bacterial dark carbon uptake were noted at three of the five first-year ice stations. Dark uptake was not observed in any of the water column samples. The high dark uptake noted in the ice samples is thought to occur as a result of bacterial proliferation during the ice thawing process. The study was also able to highlight some of the problems involved with the analysis of sea ice microalgae, using a technique that was designed to assess the P-I characteristics of phytoplanktonic assemblages. One major problem that is proposed is the modification of P-I parameters during extended ice core thawing periods (up to 4 days).
The primary objective for the study was: To determine whether microalgae associated with the pack ice north of Dumont d'Urville were maing a significant contribution to the energy flow of the Southern Ocean by supporting the associated secondary production during the winter months.
To meet the primary objective, a number of secondary objectives were also set. These were:
1) To determine whether Antarctic pack ice microalgae were photosynthetically active during the winter months;
2) To determine the photosynthesis-irradiance (P-I) characteristics of Antarctic winter pack ice microalgae in relation to ambient light intensity;
3) To compare the P-I characteristics of microalgae associated with a range of winter pack ice microhabitats sampled vertically from ice cores;
4) To compare the results obtained in 2) with those P-I characteristics obtained for Antarctic phytoplankton; and
5) To determine the suitability of the 14C technique, used in ocean productivity studies, for sea ice productivity studies.
Enroute to the sea ice, the Aurora Australis cruised SSW until intersecting 139 degrees east and then due south along the World Ocean Circulation Experiment (WOCE) SR3 transect. The study sites were located about 150 nautical miles within the ice edge (between 64 and 66 south and 138 and 141 east).
The fields in these datasets are:
Station
Date
Latitude
Longitude
Snow Depth
ice Thickness
Ice Floe Age
Time
Depth
Average Ambient Surface Irradiance
Average Under-Ice Irradiance
Percentage of Surface Irradiance
Daily Average Surface Air Temperature
Average Ice Surface Temperature
Range of Ice Surface Temperatures
Approximate Ice &Interior& Temperatures
Incubation Temperature
Mixed Layer Depth
Temperature Below Mixed Depth
Incubator Temperature
Pmax
Alpha
Ik
Spectro
HPLC
Inhibition
Dark Carbon Uptake
Percentage of Total Primary Production
Species
Habitat 
Related URL
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Description:
Download point for the data - spreadsheets
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Geographic Coverage
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Spatial coordinates
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N: -64.1
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S: -65.2
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E: 141.0
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W: 138.25
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Temporal Coverage
Start Date:
1995-08-05
Stop Date:
1995-08-28
Access Constraints
These data are publicly available for download from the URL given below.
Data Set Progress
COMPLETE
Publications/References
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Environment Canada, MSC. 2000. Canadian Snow Data CD-ROM. CRYSYS Project, Climate Processes and Earth Observation Division, Meteorological Service of Canada, Downsview, Ontario, January 2000.
Frei, A., J.A. Miller, and D.A. Robinson. 2003. Improved simulations of snow extent in the second phase of the Atmospheric Model Intercomparison Project (AMIP-2). Journal of Geophysical Research - Atmospheres, 108(D12): 4369, doi:4310.1029/2002JD003030.
Goita, K., A. Walker, and B. Goodison. 2003. Algorithm development for the estimation of snow water equivalent in the boreal forest using passive microwave data. International Journal of Remote Sensing, 24(5), 1097-1102.
Goodison, B., and A. Walker. 1995. Canadian development and use of snow cover information from passive microwave satellite data. In Choudhury, B., Y. Kerr, E.Njoku, and P. Pampaloni (eds.). Passive Microwave Remote Sensing of Land-Atmosphere Interactions. VSP BV, Utrecht, Netherlands, 245-262.
Goodison, B.E., Ferguson H.L. and McKay, G.A. 1981. Measurement and Data Analysis. Chapter 6 in Handbook of Snow, Gray, D.M. and Male, D.H. (eds.), Pergamon Press Canada Ltd., 191-274.
Goodison, B., I. Rubinstein, F. Thirkettle, and E. Langham. 1986. Determination of snow water equivalent on the Canadian Prairies using microwave radiometry. Modelling Snowmelt Induced Processes, IAHS Publication 155: 163-173.
Gray, D.M. and Male, D.H. (Eds.). 1981. Handbook of Snow. Pergamon Press Canada Ltd.
Hall, D.K., Kelly, R.E., Foster, J.L. and Chang, A.T.C. 2004. Hydrological application of remote sensing: surface states - snow. In Anderson, M.G. et al. (eds.) Encyclopedia of Hydrological Sciences, John Wiley & Sons Ltd., Chichester, UK, (in press).
Hardy, J.P., Albert, M.R. and Marsh, P. (Eds.). 1999. Snow Hydrology - The Integration of Physical, Chemical and Biological Systems. Hydrological Processes, 13, 2117-2482.
Jones, H.G., Pomeroy, J.W., Walker, D.A. and Hoham, R.W. (Eds.). 2001. Snow Ecology. Cambridge University Press,; Cambridge, UK, 378 pp.
Leathers, D.J., and M. A. Palecki. 1992. The Pacific/North American teleconnection pattern and United States Climate. Part II: temporal characteristics and index specification. J. Climate, 5, 707-716.
McClung, D. and P. Schaerer. 1993. The Avalanche Handbook. The Mountaineers, Seattle, 271 pp.
McKay, G.A., and D.M. Gray. 1981. Distribution of snow cover. Chapter 5 in Handbook of Snow, Gray, D. M., and D. H. Male (eds.), Pergamon Press, 153-190.
Moore, R.D. and I.G. McKendry. 1996. Spring snowpack anomaly patterns and winter climatic variability, British Columbia, Canada. Water Res. Research, 32, 623-632.
Phillips, David. 1990. The Climates of Canada. Cat. No. En56-1/1990E. Ottawa: Environment Canada.
Pomeroy, J.W. and Gray, D.M. 1995. Snowcover - Accumulation, Relocation and Management. National Hydrology Research Institute Science Report No. 7, Saskatoon, Canada, 144 pp.
Rango, A. 1996. Spaceborne remote sensing for snow hydrology applications. Hydrological Sciences, 41, 477-494.
Walker, A., and A. Silis. 2002. Snow cover variations over the Mackenzie river basin from SSM/I passive microwave satellite data. Annals of Glaciology, 34, 8-14.
Walker, A. and B. Goodison. 1993. Discrimination of a wet snow cover using passive microwave satellite data. Annals of Glaciology, 17: 307-311.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date:
2009-01-12
Last DIF Revision Date:
2013-01-22
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