Angle Matters: Bidirectional Effects Impact the Slope of Relationship Between Gross Primary Productivity and Sun‐Induced Chlorophyll Fluorescence from Orbiting Carbon Observatory‐2 Across Biomes

Zhang, Zhaoying ; Zhang, Yongguang ; Joiner, Joanna[Point of Contact] ; Migliavacca, Mirco

关键词: FLUORESCENCE;    CHLOROPHYLLS;    PLANTS (BOTANY);    PRODUCTIVITY;    SOLAR ACTIVITY EFFECTS;    ECOSYSTEMS;    SLOPES;    REMOTE SENSING;    BIDIRECTIONAL REFLECTANCE;   

RP-ID  :  GSFC-E-DAA-TN63333

学科分类：地球科学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

It is important to understand how sun-sensor geometry affects satellite sun -induced fluorescence (SIF) in order to take full advantage of these measurements, particularly given their close relationship with gross primary production (GPP). A recent paper by Li et al. (2018) presented results on the relationship between OCO-2 SIF and GPP from 64 flux sites. Similar to Sun et al. (2017), this study suggested a nearly universal rather than biome-specific SIF-GPP relationship across biomes though a higher slope was found for C4 plants. Their results are distinct from previous studies. We argue that the universal relationship may be biased by not separating SIF data from three observation modes that have different sensor view zenith angles.