全球海表流场多尺度结构观测卫星计划

Ocean Surface Current Multiscale Observation Mission

全球海表流场多尺度结构观测卫星计划(Ocean Surface Current multiscale Observation Mission,OS-COM)首次提出海表流场、海面风场和海浪谱(简称“流–风–浪”)一体化探测的多普勒散射计(Doppler Scatterometer,DOPS)测量原理和系统体制。OSCOM采用Ka-Ku双频多波束圆锥扫描体制的真实孔径雷达,将实现超过1000 km观测刈幅、公里级分辨率的“流–风–浪”一体化卫星直接观测。OSCOM将突破海洋亚中尺度非平衡态动力学、海洋多尺度相互作用、海气耦合的研究瓶颈,支撑实现海洋系统科学、气候变化等理论研究的重大突破。未来,应用OSCOM海表流速观测的模式改进,将奠定海洋非平衡态过程数值模拟、同化和预报的动力学基础,实现海洋和海气耦合模式的重大改进。通过与多源数据融合,OSCOM海流观测的应用将为海洋生物地球化学循环、碳收支研究和国家重大任务提供支撑。OSCOM科学卫星的实施对于我国地球系统科学和卫星对地观测重大应用的突破有至关重要的意义,有望带动我国应用卫星的发展从追赶、并行走向领跑。

OSCOM innovatively proposed the Doppler Scatterometer(DOPS)measurement principle,which could detect ocean surface current,ocean surface vector wind,and ocean surface wave spectrum(abbreviation:current-wind-wave)simultaneously.Using DOPS,a real-aperture radar,by a dual-frequency(Ka-Ku)with conically scanned rotating multi-pencil-beam antenna,OSCOM could conduct the integrated observations of current-wind-wave with a swath of more than 1000 km and a high-resolution of kilometer spatial scale.OSCOM will break through the research bottlenecks of ocean sub-mesoscale and non-equilibrium dynamics,ocean multi-scale interactions,and air-sea coupling,and support the theoretical research in ocean sciences and climate change.With the launch of the OSCOM,the application of sea surface current observations will improve the numerical model study,laying the foundation for numerical simulation,assimilation,and forecasting of oceanic non-equilibrium dynamical processes,achieving significant improvements in ocean and ocean-atmosphere coupled models.The application of OSCOM current observations,together with the other multi-source satellite dataset,including the high-resolution SST and ocean surface color,will provide support for the research in marine biogeochemical cycles and carbon budget,meeting the need of the national strategy.The implementation of OSCOM scientific satellite is of vital significance to the advance of the study and the application of satellite observations in Earth Science,leading to the implementation of the applied satellites in China.