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UV climate over the Southern Ocean south of Australia, and its biological impact - Cell count results

Entry ID: ASAC_2210_cell_counts

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Summary

Abstract: Minicosm design: Three successive experiments to a maximum incubation of 14 days were performed from mid November to early January in the summer of 2002/03 in a temperature controlled shipping container housing six 500 L polythene tanks or minicosms. Domes of UV transmissive PMMA in the roof of the container directly above the minicosms allowed ambient sunlight to be reflected to the tanks ... through tubes of anodised aluminium. These tubes reflected greater than 96% of the incident radiation irrespective of wavelength.

Light perturbation to each minicosm was achieved by screening materials that attenuated UV wavelengths. UV stabilised polycarbonate removed wavelengths shorter than 400 nm, transmitting only photosynthetically active radiation (PAR) and provided the control treatment (PAR). In minicosm 2, a mylar screen removed UVB wavelengths (280 - 320 nm), providing a treatment (UVA) with PAR and UVA. Minicosms 3, 4 and 5 (UVB1, 2 and 3 respectively) were screened by borosilicate glass of 9, 5, and 3 mm thickness, transmitting ambient light (including UVR) at the equivalent water depths (ED, k=0.4) of 7.15, 5.38 and 4.97 meters respectively. Minicosm 6 (UVB4) was screened with PMMA that transmitted ambient light at an ED of 4.43 m.

Light measurements: Measurements of downwelling UV and PAR were obtained using biometer and Licor sensors mounted on the roof of the minicosm container. A Macam, double grating spectroradiometer measured the spectral irradiance on the roof of the container. This was then weighted with the erythemal action spectrum and correlated to that obtained by the UV biometer. The Macam was used to measure the spectral irradiance at the cross of the UV biometer. The spectral intensity of light wavelengths were measured laterally and vertically in the minicosm screened only by UV-transmissive PMMA irradiance. These measurements were used to model the light field within the minicosm. In all other light treatments the Macam measured the spectral irradiance immediately below the water surface and in the centre of the minicosm. The model was then used to predict the spectral distribution and intensity of other light treatments. These measurements were repeated at interval throughout the season to determine whether solar elevation influenced transmission of ambient downwelling irradiance to the minicosms. UV and PAR sensors fixed to the outside of the minicosm container, together with the modelled light climates within each minicosm beneath each light treatment, predicted the quantify the light to which each experimental treatment was exposed.

This work was conducted as part of ASAC project 2210.

The download file contains three excel spreadsheets, plus three accompnaying word documents which provide detailed methods used in the collection of these data, plus more information about the experiments.

The fields in this dataset are:

Day
Treatment
Species
Bacteria
Particulate Organic carbon
Dissoveld Organic Carbon
Dimethylsulphide
Dimethylsulphionopropionate (total, dissolved, particualte)
Chlorophyll a
Primary Production
Bacterial Production
Ciliates
Flagellates

Related URL

Link: GET DATA

Description: Download point for the data - excel spreadsheets, word documents

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -68.5

S: -68.6

E: 78.0

W: 77.9

Temporal Coverage

Start Date: 2002-11-15

Stop Date: 2003-01-08

Location Keywords

OCEAN > SOUTHERN OCEAN

CONTINENT > ANTARCTICA

GEOGRAPHIC REGION > POLAR

Science Keywords

ATMOSPHERE > ATMOSPHERIC RADIATION > ULTRAVIOLET RADIATION

ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > OZONE

BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS

BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > COMMUNITY STRUCTURE

ISO Topic Category

BIOTA

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Instrument

CARBON ANALYZERS

TOC > Total Organic Carbon Analyzer

Quality See the word documents available in the download for details.

Access Constraints These data are not yet publicly available.

Use Constraints This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Ancillary Keywords

ANTARCTICA

BACTERIA

Data Set Progress

COMPLETE

Originating Center

Data Center

Australian Antarctic Data Centre, Australia

Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: metadata at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia

Distribution

Distribution Media: HTTP

Distribution Size: 135 kb

Distribution Format: Excel, Word

Fees: Free

Personnel

PAUL GERARD THOMSON

Role: TECHNICAL CONTACT

Phone: +61 3 6232 3562

Email: Paul.Thomson at aad.gov.au

Contact Address:

203 Channel Highway

Australian Antarctic Division

City: Kingston

Province or State: Tasmania

Postal Code: 7050

Country: Australia

Publications/References

Andrew T. Davidson, Tessa Vance, Paul G. Thomson, Nina Cadman, Graham Jones (2004). The effects of solar UV radiation on an Antarctic marine microbial community. Australian Marine Sciences Association National Conference, 6-9th July 2004, Hobart, Tasmania.

Creation and Review Dates

DIF Creation Date: 2005-08-11

Last DIF Revision Date: 2008-04-10

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