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The role of iron as a micro-nutrient to the Antarctic sea-ice zone algal community - Casey Data

Entry ID: ASAC_3026_Casey

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Summary

Abstract: Public Description of the Project
This project will assess the importance of the trace micro-nutrient element iron to Antarctic sea-ice algal communities during the International Polar Year (2007-2009). We will investigate the biogeochemistry of iron, including a comprehensive examination of its distribution, speciation, cycling and role in fuelling ice-edge phytoplankton blooms. A significant ... part of this research will concentrate on the the influence of organic exopolysaccharides on iron solubility, complexation and bioavailability, both within the ice and in surrounding snow and surface seawater. This innovative research will improve our understanding of key processes that control the productivity of the climatically-important Antarctic sea-ice zone.

Project objectives:
This project will assess the importance of the trace element iron (Fe) as a micro-nutrient to seasonal sea-ice algal communities in the Australian sector of Antarctica during the International Polar Year (2007-09). We will investigate the biogeochemistry of Fe, including a comprehensive examination of its distribution, speciation, cycling and role in fuelling ice-edge phytoplankton blooms. A significant part of this research will concentrate on the influence of organic exopolysaccharides (EPS) on Fe solubility and complexation (and hence bioavailability), both within the ice and in surrounding surface waters. This innovative research will improve our understanding of key processes that control the productivity of the climatically-important Antarctic sea-ice zone.

This metadata record describes data collected at Casey Station as part of project 3026.

Collected data from the time series experiment in sea ice near Casey station Antarctica (66 degrees 13 minutes 07 seconds S, 110 degrees 39 minutes 02 seconds E). Measurements were made at the same location during seven consecutive study days between 10 November and 2 December 2009. Variables measured were pFe (particulate Fe), TDFe (total dissolvable Fe), dFe (dissolved Fe), plFe (particulate leachable Fe), PON (particulate organic nitrogen), POC (particulate organic carbon), Chl a (Chlorophyll a), salinity, ice temperature, vb/v (brine volume fraction), mean daily air temperature, and max daily air temperature.
Measurements were taken on each study day of the snow directly overlying the sea ice (SNOW), a shallow and a deep brine (B- and B+, respectively), three sections of the sea ice core at median depths 3, 33, and 73 centimeters (SI1, SI2, and SI3, respectively) as well as two consecutive sections in the lower most basal ice (SI4 and SI5). Finally, four samples were taken of the underlying seawater at 0, 5, 10 and 15 m (SW0, SW5, SW10 and SW15, respectively).

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Link: GET DATA

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Geographic Coverage

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Spatial coordinates

N: -66.2

S: -66.3

E: 110.7

W: 110.6

Data Set Citation

Dataset Release Date: 2012-02-28

Dataset DOI: doi:http://dx.doi.org/10.4225/15/514A83EF4D31E

Parent DIF

This data set description is a member of a collection. The collection is described in
ASAC_3026

Temporal Coverage

Start Date: 2009-11-10

Stop Date: 2009-12-02

Location Keywords

OCEAN > SOUTHERN OCEAN

CONTINENT > ANTARCTICA

GEOGRAPHIC REGION > POLAR

Science Keywords

ATMOSPHERE > ATMOSPHERIC TEMPERATURE > AIR TEMPERATURE

CRYOSPHERE > SEA ICE > ICE TEMPERATURE

ISO Topic Category

FARMING

BIOTA

Access Constraints Restricted for unpublished data. Where material is published, data is
available to the public.

Use Constraints Use of restricted data is subject to User's Agreement. Crown copyright applies
to users of both restricted and unrestricted data.

Ancillary Keywords

GCMD

none

Data Set Progress

IN WORK

Originating Center

Data Center

Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada

Data Center URL: http://atl.cfs.nrcan.gc.ca/

Data Center Personnel
Name: DR. DOYLE WELLS Phone: +01-709-637-4927 Fax: +01-709-637-4948 Email: dwells at nrcan.gc.ca Contact Address: P.O. Box 960 City: Corner Brook Province or State: Newfoundland and Labrador Postal Code: A2H 6J3 Country: Canada