OCO-2 advances photosynthesis observation from space via solar-induced chlorophyll fluorescence
OCO-2 advances photosynthesis observation from space via solar-induced chlorophyll fluorescence
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DOI：
10.1126/science.aam5747
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发表时间：
2017-10-13
期刊：
影响因子：
56.9
通讯作者：
Yuen, K.
中科院分区：
文献类型：
--
作者：
Sun, Y.;Frankenberg, C.;Yuen, K.
对初级生产总值（GPP）进行量化仍然是全球碳循环研究的一个主要挑战。太阳诱发叶绿素荧光是一种分子来源的综合光合作用信号，对这一信号的星载监测可协助对地面全球初级生产率的监测。然而，SIF跟踪GPP时空变化的程度仍然没有得到解决。轨道碳观测站-2（OCO-2）的SIF数据采集和良好的空间分辨率允许直接验证地面和空中观测。经验正交函数分析表明，OCO-2 SIF与GPP在全球范围内具有一致的时空对应关系。一个线性的SIF-GPP的关系也得到了涡流通量网站覆盖不同的生物群落，设置了未来的调查，这种关系的鲁棒性在更多的生物群落的阶段。我们的研究结果支持高质量的卫星SIF研究陆地碳循环动力学的核心重要性。
Quantifying gross primary production (GPP) remains a major challenge in global carbon cycle research. Spaceborne monitoring of solar-induced chlorophyll fluorescence (SIF), an integrative photosynthetic signal of molecular origin, can assist in terrestrial GPP monitoring. However, the extent to which SIF tracks spatiotemporal variations in GPP remains unresolved. Orbiting Carbon Observatory-2 (OCO-2)'s SIF data acquisition and fine spatial resolution permit direct validation against ground and airborne observations. Empirical orthogonal function analysis shows consistent spatiotemporal correspondence between OCO-2 SIF and GPP globally. A linear SIF-GPP relationship is also obtained at eddy-flux sites covering diverse biomes, setting the stage for future investigations of the robustness of such a relationship across more biomes. Our findings support the central importance of high-quality satellite SIF for studying terrestrial carbon cycle dynamics.