项目名称: 海气边界层稳定度对C波段雷达遥感海面风场影响机理研究
项目编号: No.41201350
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地理学
项目作者: 杨晓峰
作者单位: 中国科学院遥感与数字地球研究所
项目金额: 20万元
中文摘要: 星载合成孔径雷达(SAR)获得的空间分辨率优于1公里的海面风场反演数据,在海洋环境监测、海洋数值预报、海洋防灾减灾和海洋资源开发等领域应用前景广阔。但目前SAR风场反演使用的海面后向散射模型未考虑大气边界层稳定态的变化,在海气相互作用剧烈区域风场反演误差很大。 本研究将重点解决海气边界层不稳定情况下的海面C波段雷达后向散射机理问题,找到影响该过程的关键控制参量,并通过理论模型建立海气界面环境参量与海面微波后向散射强度间的定量关系,利用SAR观测数据和海洋浮标现场测量资料验证提出模型的实用性和精度,形成不稳定态下C波段雷达反演海面风场技术方法。 项目研究成果可降低海气相互作用过程对微波遥感定量应用的影响,提高不稳定态条件下的海面风场遥感精度,促进海气相互作用过程的机理研究,推动微波遥感技术进入海洋业务化监测体系。
中文关键词: 合成孔径雷达;海面风场;雷达后向散射;海气边界层;
英文摘要: High resolution (less than 1 km) sea surface winds retrieved from space-borne synthetic aperture radar (SAR) could be used in ocean environmental monitoring, marine weather forecasting, ocean disaster prediction as well as coastal resource development. However, during SAR winds retrieval, the stability condition of marine atmospheric boundary layer (MABL) has not been taken into account. Thus, the derived wind products have significant error in regions where the air-sea interactions are strong. In this study, we will analyze C band radar sea surface backscatter characteristic under unstable MABL conditions, propose a new model to describe the relationship of environment variables and radar return signals. Then satellite SAR and ocean moored buoy observation data will be implemented to validate the new model. The proposed method can reduce the effect of air-sea interactions on microwave remote sensing applications, and the error of sea surface wind retrievals under unstable MABL conditions. It will also improve the understanding of air-sea interaction processes, promote remote sensing applications into operational marine environment monitoring as well.
英文关键词: Synthetic aperture radar;Sea surface wind;Radar backscatter;Marine atmospheric boundary layer;