Airborne Measurements in the Stable Boundary Layer over the Larsen Ice Shelf, Antarctica
Airborne Measurements in the Stable Boundary Layer over the Larsen Ice Shelf, Antarctica
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南极洲拉森冰架稳定边界层的机载测量
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Weiss
中科院分区：
文献类型：
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作者：
John C. King;T. Lachlan;R. Ladkin;A. Weiss
本文介绍了在南极洲拉森冰架上空飞行的边界层结构和表面湍流通量的飞机测量结果。与föhn气流相关的暖平流导致冰架上方形成稳定的边界层，在地表逆温顶部有一个明确的低层急流。与急流相关的强切变使梯度理查德森数较小，并维持了至少600 m深度的湍流边界层。净地表能量平衡达到52 Wm−2，相当于每天13 mm水的融化速率，净辐射（48 Wm−2）对融化的贡献最大。感热通量（13 Wm−2）的贡献在很大程度上被上升的潜热通量（- 9 Wm−2）抵消。这些测量提供了对控制最近经历了快速变暖和冰川消融的地区表面融化速率的过程的深入了解。
We present aircraft measurements of boundary-layer structure and surface turbulent fluxes from a flight over the Larsen Ice Shelf, Antarctica. Warm advection, associated with föhn flow, led to the formation of a stable boundary layer over the ice shelf, with a well-defined low-level jet at the top of the surface inversion. The strong shear associated with the jet kept the gradient Richardson number small and maintained a turbulent boundary layer over a depth of at least 600 m. The net surface energy balance amounted to 52 Wm−2, equivalent to a melt rate of 13 mm water per day, with net radiation (48 Wm−2) making the largest contribution to melt. The contribution from the sensible heat flux (13 Wm−2) was largely balanced by an upwards latent heat flux (−9 Wm−2). These measurements provide insight into the processes that control surface melt rates in an area that has experienced recent rapid warming and deglaciation.