OCO-2 advances photosynthesis observation from space via solar-induced chlorophyll fluorescence

作者：Ying Sun, Christian Frankenberg, Jeffrey D. Wood, David Schimel, M. Jung, Luis Guanter, D. Drewry, Manish Verma, Albert Porcar‐Castell, Timothy J. Griffis, Lianhong Gu, Troy S. Magney, Philipp Köhler, Bradley Evans, Karen Yuen · 发表于：Science · 年份：2017 · DOI：10.1126/science.aam5747 · 被引用次数：727 · 研究领域：Atmospheric and Environmental Gas Dynamics、Plant Water Relations and Carbon Dynamics、Atmospheric Ozone and Climate

INTRODUCTION Reliable estimation of gross primary production (GPP) from landscape to global scales is pivotal to a wide range of ecological research areas, such as carbon-climate feedbacks, and agricultural applications, such as crop yield and drought monitoring. However, measuring GPP at these scales remains a major challenge. Solar-induced chlorophyll fluorescence (SIF) is a signal emitted directly from the core of photosynthetic machinery. SIF integrates complex plant physiological functions in vivo to reflect photosynthetic dynamics in real time. The advent of satellite SIF observation promises a new era in global photosynthesis research. The Orbiting Carbon Observatory-2 (OCO-2) SIF product is a serendipitous but critically complementary by-product of OCO-2’s primary mission target—atmospheric column CO 2 ( X CO 2 ). OCO-2 SIF removes some important roadblocks that prevent wide and in-depth applications of satellite SIF data sets and offers new opportunities for studying the SIF-GPP relationship and vegetation functional gradients at different spatiotemporal scales. RATIONALE Compared with earlier satellite missions with SIF capability, the OCO-2 SIF product has substantially improved spatial resolution, data acquisition, and retrieval precision. These improvements allow satellite SIF data to be validated, for the first time, directly against ground and airborne measurements and also used to investigate the SIF-GPP relationship and terrestrial ecosystem functional dynami...