Snowdrift effect on snow deposition: Insights from a comparison of a snow pit profile and meteorological observations in east Antarctica

Ding, Minghu; Zhang, Tong; Xiao, Cunde; Li, Chuanjin; Jin, Bo; Bian, Lingen; Wang, ShuJie; Zhang, Dongqi; Qin, Dahe

doi:10.1007/s11430-016-0008-4

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“…These studies found that, especially during winter, the strong longwave radiative heat loss is compensated by downward turbulent sensible heat transport, which is enabled by the high katabatic wind speeds (Van den Broeke, et al, ; Van den Broeke et al, 2005). Wind‐driven processes thus not only play a role in shaping the surface morphology and affect the snow surface roughness but also transport significant amounts of sensible and latent heat, even under drifting snow conditions (Bintanja, ; Bintanja & Reijmer, ; Frezzotti et al, ; Eisen et al, ; Ding et al, ). For instance, over the ablation zone of Taylor Glacier, the sublimation rate could reach up to 0.4 m a −1 under the influence of strong katabatic winds (Bliss et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Princess Elizabeth Land appears as a typical East Antarctic katabatic wind region; the area has a very large topographic backdrop, high wind speeds, and a very constant wind direction (Chen et al, ; Ding et al, ; Ding et al, ). Due to continuous erosion and densification, the surface snow can be characterized as a “glazed surface” (Ding et al, ; Scambos et al, ).…”

Section: Introductionmentioning

confidence: 99%

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The Surface Energy Balance at Panda 1 Station, Princess Elizabeth Land: A Typical Katabatic Wind Region in East Antarctica

et al. 2020

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Using automatic weather station and reanalysis data (ERA5) from 2011 at Panda-1 Station, situated in the katabatic region of Princess Elizabeth Land, East Antarctica, the surface energy balance was calculated using a surface temperature iteration method, and the characteristics of each energy component were analyzed. Downward shortwave and longwave radiation were the two primary energy sources during summer days with seasonal means of 346 and 142 W m −2 . The turbulent fluxes of sensible and latent heat flux represent smaller heat sources. In the annual mean, reflected shortwave radiation exceeds the upward longwave radiation with a seasonal average values of −287 W m −2 . During winter, the shortwave radiation is small, and the main energy input and output terms of the surface energy balance are downward and upward longwave radiation, with seasonal average values of 149 and −159 W m −2 , respectively. The combination of high wind speed and a large near-surface humidity gradient during summer resulted in significant frost depositional events. The total surface frost deposition for the whole year was 24 kg m −2 , which accounted for 61% of the total accumulation (averaged over 10 years). When a high-pressure ridge blocks cyclones and deflects fronts of low-pressure systems to inland East Antarctica during winter, this has a significant impact on the surface energy balance at Panda 1 automatic weather station, with daily sensible and latent heat fluxes increasing by as much as 25 and 12 W m −2 , respectively. These results still contain uncertainties as we only address a single year, when interannual variability may be considerable, and we do not consider drifting snow sublimation.

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