8-day net community production

8-day net community production derived from the algorithm in "Satellite estimates of net community production based on O2/Ar observations and comparison to other estimates"

8天净群落生产力（net community production）由《基于O₂/Ar观测的净群落生产力卫星估算及与其他估算结果的对比》一文所提出的算法推导得到。