Improving Estimates of Gross Primary Productivity by Assimilating Solar-Induced Fluorescence Satellite Retrievals in a Terrestrial Biosphere Model Using a Process-Based SIF Model
Improving Estimates of Gross Primary Productivity by Assimilating Solar-Induced Fluorescence Satellite Retrievals in a Terrestrial Biosphere Model Using a Process-Based SIF Model
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DOI：
10.1029/2019jg005040
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发表时间：
2019-11-07
影响因子：
3.7
通讯作者：
Bastrikov, V
中科院分区：
文献类型：
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作者：
Bacour, C.;Maignan, F.;Bastrikov, V
在过去几年中，从空间进行的太阳诱导叶绿素荧光观测已成为评价全球陆地生物圈模型模拟的总初级生产力时空分布的一个有前途的资源。SIF可用于通过统计贝叶斯数据同化技术优化关键模型参数来改进GPP模拟。一个先决条件是，在陆地生物圈模型中，全球方案伙伴关系和系统要素框架之间存在功能联系。在这里，我们提出了一个机械SIF观测运营商的发展ORCHIDEE（组织碳和水文动态生态系统）陆地生物圈模型。它模拟调节光系统II荧光量子产率在叶水平由于一种新的参数化的非光化学猝灭作为温度，光合有效辐射，光化学和归一化量子产率的函数。它模拟叶绿素荧光的辐射传输到冠层的顶部，使用SCOPE（土壤冠层观测光合作用能量）模型的参数简化。我们吸收了两年的每月OCO-2（轨道碳观测站-2）SIF产品在0.5度（2015-2016），以优化兰花光合作用和物候参数在所有植物功能类型的网格点集合。对模拟全球生产力的影响相当大，1990-2009年期间，全球规模预算大幅减少280亿吨碳/年。全球伙伴关系优化预算（1990-2009年/2001-2009年期间每年134/136千兆吨碳）与全球伙伴关系独立估计数，特别是FLUXSAT（2001-2009年期间每年137千兆吨碳）和FLUXCOM（1990-2009年期间每年121千兆吨碳）非常吻合。我们的研究结果还表明，SIF-GPP关系的生物群落依赖性，需要改善某些植物功能类型。
Over the last few years, solar-induced chlorophyll fluorescence (SIF) observations from space have emerged as a promising resource for evaluating the spatio-temporal distribution of gross primary productivity (GPP) simulated by global terrestrial biosphere models. SIF can be used to improve GPP simulations by optimizing critical model parameters through statistical Bayesian data assimilation techniques. A prerequisite is the availability of a functional link between GPP and SIF in terrestrial biosphere models. Here we present the development of a mechanistic SIF observation operator in the ORCHIDEE (Organizing Carbon and Hydrology In Dynamic Ecosystems) terrestrial biosphere model. It simulates the regulation of photosystem II fluorescence quantum yield at the leaf level thanks to a novel parameterization of non-photochemical quenching as a function of temperature, photosynthetically active radiation, and normalized quantum yield of photochemistry. It emulates the radiative transfer of chlorophyll fluorescence to the top of the canopy using a parametric simplification of the SCOPE (Soil Canopy Observation Photosynthesis Energy) model. We assimilate two years of monthly OCO-2 (Orbiting Carbon Observatory-2) SIF product at 0.5 degrees (2015-2016) to optimize ORCHIDEE photosynthesis and phenological parameters over an ensemble of grid points for all plant functional types. The impact on the simulated GPP is considerable with a large decrease of the global scale budget by 28 GtC/year over the period 1990-2009. The optimized GPP budget (134/136 GtC/year over 1990-2009/2001-2009) remarkably agrees with independent GPP estimates, FLUXSAT (137 GtC/year over 2001-2009) in particular and FLUXCOM (121 GtC/year over 1990-2009). Our results also suggest a biome dependency of the SIF-GPP relationship that needs to be improved for some plant functional types.