我国海洋盐度探测卫星产品发布

Core Viewpoint - The successful launch and product release of China's first ocean salinity detection satellite (HY-4A) marks a significant milestone in enhancing the country's ocean observation capabilities and filling the gap in satellite-based ocean salinity detection [3][4]. Group 1: Satellite Launch and Capabilities - The HY-4A satellite was successfully launched on November 14, 2024, and is designed for remote sensing of ocean salinity, thereby improving the ocean satellite observation system [3]. - The satellite operates in a sun-synchronous orbit with a 29-day return cycle, positioned approximately 654 kilometers above the Earth, allowing for global continuous observation [4]. - It can cover no less than 98% of global ocean areas within three days, providing high-precision ocean salinity and soil moisture products [4]. Group 2: Payload and Data Utilization - The satellite's effective payloads include a synthetic aperture radiometer and a passive-active detector, which work together to obtain sensitive L-band radiation brightness temperature, sea surface temperature, and roughness information [4]. - The data collected will support various applications, including marine environmental protection, disaster reduction, global climate change monitoring, agricultural environmental monitoring, and numerical weather forecasting [4]. Group 3: Data Access and Distribution - Users can access the satellite products through the China Ocean Satellite Data Service System website and FTP, with specific permissions required for FTP downloads [5].