Seasonality of spectral albedo and transmittance as observed in the Arctic Transpolar Drift in 2007

摘要: [1] The first continuous and high temporal resolution record of spectral albedo transmittance snow sea ice in the Arctic Ocean over an entire summer season is presented. Measurements were performed at a manned station on multiyear Transpolar Drift during drift schooner Tara from April to September 2007. Concurrent autonomous measurements mass balance weekly observations sea-ice properties complement data set. The seasonality physical biological processes characterized, including quantification melt onset (10 June), duration, freeze (15 August). Over one year, approximately two thirds transmitted energy reached ocean 66-day-long season. During second half July, irradiance decreased by 90% absorption directly under increased, significantly affecting vertical partitioning irradiance. radiation time series suggests that biomass abundance or below caused this decrease. Comparing set with broadband measured same location shows variability can be explained integrated limited wavelength range. combination allows comprehensive description, quantification, processes, even minimal additional situ observations, suggesting such sets collected autonomously provide insight into ice.