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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/5747ADAFD576A&rft.title=UV climate over the Southern Ocean south of Australia, and its biological impact - Cell count results&rft.identifier=10.4225/15/5747ADAFD576A&rft.publisher=Australian Antarctic Data Centre&rft.description=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 accompanying 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 Dissolved Organic Carbon Dimethylsulphide Dimethylsulphionopropionate (total, dissolved, particulate) Chlorophyll a Primary Production Bacterial Production Ciliates Flagellates&rft.creator=THOMSON, PAUL GERARD &rft.creator=NUNEZ, MANUEL &rft.creator=DAVIDSON, ANDREW TIMOTHY &rft.date=1970&rft.coverage=northlimit=-68.5; southlimit=-68.6; westlimit=77.9; eastLimit=78.0; projection=WGS84&rft.coverage=northlimit=-68.5; southlimit=-68.6; westlimit=77.9; eastLimit=78.0; projection=WGS84&rft_rights= http://creativecommons.org/licenses/by/3.0/&rft_rights=This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2210_cell_counts when using these data.&rft_subject=Biota&rft_subject=Climatology/meteorology/atmosphere&rft_subject=Ultraviolet Radiation&rft_subject=Earth Science&rft_subject=Atmosphere&rft_subject=Atmospheric Radiation&rft_subject=Ozone&rft_subject=Atmospheric Chemistry&rft_subject=Oxygen Compounds&rft_subject=Biomass Dynamics&rft_subject=Biosphere&rft_subject=Ecological Dynamics&rft_subject=Ecosystem Functions&rft_subject=Community Structure&rft_subject=Community Dynamics&rft_subject=Antarctica&rft_subject=Bacteria&rft_subject=Chlorophyll&rft_subject=Chlorophyll a&rft_subject=Day&rft_subject=Dimethylsulphide&rft_subject=Dimethylsulphionopropionate&rft_subject=Dissoveld Organic Carbon&rft_subject=Dms&rft_subject=Dmsp&rft_subject=Doc&rft_subject=Food Web&rft_subject=Microbes&rft_subject=Particulate Organic Carbon&rft_subject=Poc&rft_subject=Primary Production&rft_subject=Species&rft_subject=Treatment&rft_subject=Uv&rft_subject=Uvb&rft_subject=Carbon Analyzers&rft_subject=Toc > Total Organic Carbon Analyzer&rft_subject=Ocean > Southern Ocean&rft_subject=Continent > Antarctica&rft_subject=Geographic Region > Polar&rft_place=Hobart&rft.type=dataset&rft.language=English Go to Data Provider

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CC-BY

http://creativecommons.org/licenses/by/3.0/

This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2210_cell_counts when using these data.

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These data are publicly available for download from the provided URL.

Brief description

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 accompanying 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
Dissolved Organic Carbon
Dimethylsulphide
Dimethylsulphionopropionate (total, dissolved, particulate)
Chlorophyll a
Primary Production
Bacterial Production
Ciliates
Flagellates

Issued: 2005-08-11

Data time period: 2002-11-15 to 2003-01-08

78,-68.5 78,-68.6 77.9,-68.6 77.9,-68.5 78,-68.5

77.95,-68.55

text: northlimit=-68.5; southlimit=-68.6; westlimit=77.9; eastLimit=78.0; projection=WGS84