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- W577589299 abstract "Today we experience an accelerated melting of sea ice in the Arctic which the general circulation models are inadequate to predict. We believe one of the reasons is the shortcomings in the snow and sea-ice albedo schemes for these models. Considering the e ect sea ice has on the Arctic climate due to the ice albedo feedback, accurate, physically-based parameterizations schemes for sea-ice albedo are crucial. A new sea-ice albedo parameterization scheme has been developed and implemented in ECHAM5 general circulation model, and includes important components like albedo decay due to snow aging, ice thickness dependency and an explicit treatment of melt pond albedo. Overall, the new albedo scheme reduces the sea-ice albedo, resulting in an overall reduction in sea-ice thickness, concentration and volume, particularly for northern hemisphere in summer due to the inclusion of melt ponds. We have also investigated procedures for collecting and processing datasets describing the sea-ice environment. The focus has varied from small scales (in-situ measurements), regional scales (airborne measurements) and global scales (remote sensing measurements), providing information of the optical properties of snow and sea ice at di erent resolutions. The small scale measurements were utilized for point-site validation and process studies, while the combinations of airborne measurements provided fractional sea-ice types, sea-ice albedo and sea-ice thickness, thus also estimates for sea-ice area and volume. Such combined datasets are very suitable for validation of climate models. Techniques for appropriate and consistent statistical validation of climate models in general (either to compare climate simulations for di erent parameterizations, or for validating climate model output against observations) have also been investigated. We have developed an adapted signi cance-in-scale-space methodology to detect statistical signi cant di erences between two climatological datasets." @default.
- W577589299 created "2016-06-24" @default.
- W577589299 creator A5045033102 @default.
- W577589299 date "2007-12-01" @default.
- W577589299 modified "2023-09-23" @default.
- W577589299 title "Optical properties of snow and sea icefield measurements, parameterizationschemes and validation" @default.
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