Solar-induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO-2 and flux tower observations

被引:295
|
作者
Li, Xing [1 ,2 ]
Xiao, Jingfeng [1 ]
He, Binbin [2 ,3 ]
Arain, M. Altaf [4 ,5 ]
Beringer, Jason [6 ]
Desai, Ankur R. [7 ]
Emmel, Carmen [8 ]
Hollinger, David Y. [9 ]
Krasnova, Alisa [10 ]
Mammarella, Ivan [11 ]
Noe, Steffen M. [10 ]
Serrano Ortiz, Penelope [12 ]
Rey-Sanchez, A. Camilo [13 ]
Rocha, Adrian V. [14 ,15 ]
Varlagin, Andrej [16 ]
机构
[1] Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA
[2] Univ Elect Sci & Technol China, Sch Resources & Environm, Chengdu, Sichuan, Peoples R China
[3] Univ Elect Sci & Technol China, Ctr Informat Geosci, Chengdu, Sichuan, Peoples R China
[4] McMaster Univ, McMaster Ctr Climate Change, Hamilton, ON, Canada
[5] McMaster Univ, Sch Geog & Earth Sci, Hamilton, ON, Canada
[6] Univ Western Australia, UWA Sch Agr & Environm, Crawley, WA, Australia
[7] Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI USA
[8] Swiss Fed Inst Technol, Inst Agr Sci, Dept Environm Syst Sci, Zurich, Switzerland
[9] US Forest Serv, Northern Res Stn, USDA, Durham, NH USA
[10] Estonian Univ Life Sci, Inst Agr & Environm Sci, Tartu, Estonia
[11] Univ Helsinki, Inst Atmosphere & Earth Syst Res Phys, Fac Sci, Helsinki, Finland
[12] Univ Granada, Inst Interuniv Invest Sistema Tierra Andalucia II, Granada, Spain
[13] Ohio State Univ, Dept Civil Environm & Geodet Engn, Columbus, OH 43210 USA
[14] Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA
[15] Univ Notre Dame, Environm Change Initiat, Notre Dame, IN 46556 USA
[16] Russian Acad Sci, AN Severtsov Inst Ecol & Evolut, Moscow, Russia
基金
中国国家自然科学基金; 美国国家航空航天局; 美国国家科学基金会;
关键词
carbon cycle; carbon flux; chlorophyll fluorescence; eddy covariance; gross primary productivity; MODIS; OCO-2; vegetation type; GROSS PRIMARY PRODUCTION; NET ECOSYSTEM EXCHANGE; LEAF-AREA INDEX; VEGETATION INDEXES; SATELLITE MEASUREMENTS; PRIMARY PRODUCTIVITY; SEASONAL-VARIATIONS; CANOPY; ASSIMILATION; REFLECTANCE;
D O I
10.1111/gcb.14297
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Solar-induced chlorophyll fluorescence (SIF) has been increasingly used as a proxy for terrestrial gross primary productivity (GPP). Previous work mainly evaluated the relationship between satellite-observed SIF and gridded GPP products both based on coarse spatial resolutions. Finer resolution SIF (1.3kmx2.25km) measured from the Orbiting Carbon Observatory-2 (OCO-2) provides the first opportunity to examine the SIF-GPP relationship at the ecosystem scale using flux tower GPP data. However, it remains unclear how strong the relationship is for each biome and whether a robust, universal relationship exists across a variety of biomes. Here we conducted the first global analysis of the relationship between OCO-2 SIF and tower GPP for a total of 64 flux sites across the globe encompassing eight major biomes. OCO-2 SIF showed strong correlations with tower GPP at both midday and daily timescales, with the strongest relationship observed for daily SIF at the 757nm (R-2=0.72, p<0.0001). Strong linear relationships between SIF and GPP were consistently found for all biomes (R-2=0.57-0.79, p<0.0001) except evergreen broadleaf forests (R-2=0.16, p<0.05) at the daily timescale. A higher slope was found for C-4 grasslands and croplands than for C-3 ecosystems. The generally consistent slope of the relationship among biomes suggests a nearly universal rather than biome-specific SIF-GPP relationship, and this finding is an important distinction and simplification compared to previous results. SIF was mainly driven by absorbed photosynthetically active radiation and was also influenced by environmental stresses (temperature and water stresses) that determine photosynthetic light use efficiency. OCO-2 SIF generally had a better performance for predicting GPP than satellite-derived vegetation indices and a light use efficiency model. The universal SIF-GPP relationship can potentially lead to more accurate GPP estimates regionally or globally. Our findings revealed the remarkable ability of finer resolution SIF observations from OCO-2 and other new or future missions (e.g., TROPOMI, FLEX) for estimating terrestrial photosynthesis across a wide variety of biomes and identified their potential and limitations for ecosystem functioning and carbon cycle studies.
引用
收藏
页码:3990 / 4008
页数:19
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