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Conference Paper

Response of snow albedo to experimental additions of bushfire aerosols and algae

Authors

Dadic,  Ruzica
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Novis,  Phil
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hunt,  John
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lauren,  Vargo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Purdie,  Heather
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fuchs,  Pablo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Winter-Billington,  Alex
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jolly,  Ben
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Anderson,  Brian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Naeher,  Sebastian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Winton,  Holly
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Dadic, R., Novis, P., Hunt, J., Lauren, V., Purdie, H., Fuchs, P., Winter-Billington, A., Jolly, B., Anderson, B., Naeher, S., Winton, H. (2023): Response of snow albedo to experimental additions of bushfire aerosols and algae, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3968


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019865
Abstract
The exposure of New Zealand’s snow and ice fields to significant inputs of aerosols from Australian bushfires makes NZ an ideal site to study albedo's physical and biological controls. Under projected scenarios of increased frequency and severity of Australian droughts and bushfires, snow tainted by Australian aerosols will become increasingly common in NZ. Likewise, snow/ice algae are expected to respond to climate warming by increasing abundance, biomass, and distribution. Because the bushfire season coincides with the melt period, when snow algae undertake vegetative growth with the availability of liquid water, establishing the effect of bushfire aerosols and algae, and their interactions, on the melting of glacial systems is urgently needed. We present albedo measurements from two controlled field experiments. The experiments at Tasman Saddle used treatments applied to plots with a full factorial experimental design to determine the effects of aerosols on albedo and the resulting snow melt. The experiment involved adding dry aerosols at five treatment levels: 0, 12.5%, 25%, 50%, and 100% of the maximum deposited 2019/20 dust concentrations. At Canyon Creek, snow algae sourced from a nearby site was applied as an additional treatment at five levels. The albedo effect of the treatments was measured with a scanning spectroradiometer. We determined snow melt at each plot using small-scale DEMs before and after the dust/algae was applied and measured physical snow properties. This project will use drones and remote sensing to quantify the effects of aerosol deposition and algal growth on glacier mass balance at the catchment scale.