基于MOSAiC观测的北极海冰表面湍流通量参数化方案研究

北极海冰快速变化可通过复杂的反馈过程对区域乃至更大尺度的天气气候产生重要影响。近冰层湍流通量交换作为海冰-大气相互作用的重要过程之一，在海冰演变中扮演着重要角色。对于现场观测数据匮乏的北极地区，合适的参数化方法是获得海冰表面湍流通量的主要途径。然而，现有的湍流通量参数化方案无法完全适用于新气候背景下的北极海冰。存在的问题主要包括：（1）稳定度修正函数（特别是针对强稳定层结）的适用性仍不明确；（2）没有考虑小风条件下非局地效应对近冰层湍流通量的影响；（3）缺乏强风条件下能够反映海冰表面状态变化的粗糙度方案。鉴于此，本项目将基于国际上最新获取的MOSAiC观测数据，发展更加适用于新时期北极海冰属性的参数化方案。预期成果有助于深化理解北极海冰-大气相互作用过程以及北极海冰快速变化机制，进而改进北极海冰模拟和预测能力。

The rapid change of Arctic sea ice has an important influence on regional and even larger scale weather and climate through complex feedback processes. As one of the important processes of sea ice-atmosphere interaction, the turbulent fluxes exchange near the ice surface plays an important role in sea ice evolution. Since the field observation data are scarce in the Arctic, the main way to obtain the turbulent fluxes near sea ice surface is to use the proper parameterization schemes. However, the existing schemes are not fully applicable to the current Arctic sea ice. The problems mainly include: (1) the applicability of the stability correction function (especially for the strong stable stratification) is still unclear; (2) the influence of non-local effects under light wind conditions on the near-surface turbulent fluxes are neglected; (3) lack of a surface roughness scheme reflecting the change of sea ice surface state under strong wind conditions. Because of these limitations, this project aims to develop a more suitable parameterization scheme for the current Arctic sea ice properties based on the newly acquired MOSAiC observation data. The expected results will help to deepen the understanding of the Arctic sea ice-atmosphere interaction processes and the mechanism of Arctic sea ice rapid change, and to further improve the Arctic sea ice simulation and prediction ability.