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Multi-frequency studies of snow and sea ice: A combined remote sensing and modelling investigation aiming to reduce biases in polar sea ice thickness

雪和海冰的多频率研究：遥感和建模相结合的研究，旨在减少极地海冰厚度的偏差

基本信息

批准号：
2547163
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2547163
关键词：
Multi frequency studies snow sea

项目摘要

Sea ice is an important component of the earth system as it acts to cool the planet whilst regulating the exchange of momentum, heat and moisture between the atmosphere and ocean. The snowpack that accumulates upon sea ice both impacts the evolution of the ice below and hinders our ability to accurately retrieve its thickness from space. But despite the two forming an inherently coupled system, snow-on-sea-ice remains poorly understood. The layered snowpack currently biases sea ice thickness retrievals from radar (microwave) altimeters by: (1) slowing down radar-wave propagation, (2) changing the radar-wave dominant scattering horizon, and (3) changing the hydrostatic equilibrium of the system, thus altering sea ice freeboard. In this project, I will take an approach that combines satellite remote sensing of sea ice in different frequencies of electromagnetic radiation and using different techniques (i.e., active and passive remote sensing) to provide more accurate estimations of the depth of the snow layer and its properties. These studies will be backed by investigations using physics-based models to simulate electromagnetic scattering under different physical scenarios which can help us to understand how a multi-frequency approach can ultimately reduce biases in snow/sea ice thickness estimations.

海冰是地球系统的重要组成部分，因为它可以冷却地球，同时调节大气和海洋之间的动量，热量和水分交换。在海冰上堆积的积雪既影响了下面冰的演变，也阻碍了我们从太空中准确检索其厚度的能力。但是，尽管两者形成了一个内在的耦合系统，海冰上的雪仍然知之甚少。分层积雪目前偏置海冰厚度反演雷达（微波）高度计：（1）减慢雷达波传播，（2）改变雷达波主导散射地平线，（3）改变系统的流体静力平衡，从而改变海冰干舷。在这个项目中，我将采取一种方法，结合卫星遥感海冰在不同频率的电磁辐射和使用不同的技术（即，主动和被动遥感），以提供对雪层深度及其特性的更准确估计。这些研究将得到使用基于物理的模型来模拟不同物理场景下电磁散射的调查的支持，这可以帮助我们了解多频率方法如何最终减少雪/海冰厚度估计的偏差。