Description of our project objectives

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This project is funded for the time period 2002 to 2007 with field sampling in spring 2002 and summer 2004 on icebreakers and experimental studies in 2003 and 2005 in Barrow, Alaska.

Main Objectives:

Our major research objectives are:

- Physical/chemical components:
(1) Characterize temporal and spatial variability of ice microstructure and physical/chemical properties of the sea ice layers.
(2) determine fluid (and nutrient) exchange in the lowermost ice layers for a number of different cases and scenarios; extend this work well into the ice decay regime,
(3) obtain data sets on ice morphology and relate it to the distribution of under-ice meltwater layers reducing IPP, assess the prerequisites for their sustained presence,
(4) determine areal flux of ice (FY/MY) and associated biomass for SBI study area from remote sensing and field data.

- Biological components:
(1) characterize the temporal and spatial variability of ice algal biomass (algal pigments, species composition, size spectra, ∂13C and ∂15N) over the entire range of relevant ice thicknesses,
(2) determine the activity of ice algae (with optical and tracer techniques) in the lowermost ice layers as a function of nutrient (nitrogen compounds) and light availability (P vs I curves),
(3) determine the same biological properties as in (1) and (2) for the under-ice water layers (scale of cm to meters),
(4) identify nutrient and/or light limitation of ice algae through determination of 13C incorporation along different metabolic pathways..

Techniques and analyses involve determination of ice thicknesses, salinity, temperature, porosity and permeability. The biological signature is measured as ice algal biomass (including stable isotope data) and activity.



Presentations and Publications:

to be added

page modified July 11, 2003 .