Wide discrepancies in the magnitude and direction of modeled solar-induced chlorophyll fluorescence in response to light conditions
Wide discrepancies in the magnitude and direction of modeled solar-induced chlorophyll fluorescence in response to light conditions
复制标题
DOI：
10.5194/bg-17-3733-2020
复制
发表时间：
2020-07
期刊：
影响因子：
4.9
通讯作者：
N. Parazoo;T. Magney;A. Norton;B. Raczka;C. Bacour;F. Maignan;I. Baker;Yongguang Zhang;Bo Qiu;M. Shi;N. MacBean;D. Bowling;S. Burns;P. Blanken;J. Stutz;K. Grossmann;C. Frankenberg
中科院分区：
文献类型：
--
作者：
N. Parazoo;T. Magney;A. Norton;B. Raczka;C. Bacour;F. Maignan;I. Baker;Yongguang Zhang;Bo Qiu;M. Shi;N. MacBean;D. Bowling;S. Burns;P. Blanken;J. Stutz;K. Grossmann;C. Frankenberg
抽象。近年来，太阳诱导叶绿素荧光（SIF）被动遥感技术的成功应用推动了全球陆地生物圈模式（TBMs）中冠层荧光模型的发展和集成，以用于气候和碳循环研究。在叶片和冠层尺度的荧光与光化学的相互作用提供了机会，诊断和约束模型模拟的光合作用和相关过程，通过直接比较和同化塔，机载和卫星数据。TBM描述了与整个冠层的阳光吸收、叶水平荧光发射、散射和再吸收相关的关键过程。在这里，我们分析模拟从合奏的过程为基础的TBM-SIF模型（SiB 3-简单生物圈模型，SiB 4，CLM4.5 -社区土地模型，CLM5.0，BETHY -生物圈能量转移水文学，ORCHIDEE -动态生态系统中的组织碳和水文学，和BEPS -北方生态系统生产力模拟器）和SCOPE在科罗拉多靠近尼沃特岭的亚高山万年青针叶林的（土壤冠层观测光合作用能）冠层辐射和植被模式。这些模型与当地气象学相结合，并在生长季节（2017年7月至8月）的周日和天气尺度上对基于塔式的连续远红外SIF和总初级生产力分区（GPP）涡度协方差数据进行分析。我们的主要目标是总结在一个相对较短的时间内（夏季），当光线，冠层结构和色素是相似的，设置区域到全球规模的分析阶段的TBM-SIF建模的网站级的艺术状态。我们发现，这些模型一般都很好地限制在模拟光合产量，但在模拟吸收的光合有效辐射（PAR），绝对GPP和荧光，量子产量，光响应在叶片和冠层尺度上表现出强烈的分歧模式。这项研究强调了在压力和非压力环境中的非光化学猝灭的机理建模的必要性，并提高了光吸收（APAR）的代表性，在阳光照射和阴影的叶子，从叶子到冠层尺度的辐射传输的光分布。
Abstract. Recent successes in passive remote sensing of far-red solar-induced chlorophyll fluorescence (SIF) have spurred the development and integration of canopy-level fluorescence models in global terrestrial biosphere models (TBMs) for climate and carbon cycle research. The interaction of fluorescence with photochemistry at the leaf and canopy scales provides opportunities to diagnose and constrain model simulations of photosynthesis and related processes, through direct comparison to and assimilation of tower, airborne, and satellite data. TBMs describe key processes related to the absorption of sunlight, leaf-level fluorescence emission, scattering, and reabsorption throughout the canopy. Here, we analyze simulations from an ensemble of process-based TBM–SIF models (SiB3 – Simple Biosphere Model, SiB4, CLM4.5 – Community Land Model, CLM5.0, BETHY – Biosphere Energy Transfer Hydrology, ORCHIDEE – Organizing Carbon and Hydrology In Dynamic Ecosystems, and BEPS – Boreal Ecosystems Productivity Simulator) and the SCOPE (Soil Canopy Observation Photosynthesis Energy) canopy radiation and vegetation model at a subalpine evergreen needleleaf forest near Niwot Ridge, Colorado. These models are forced with local meteorology and analyzed against tower-based continuous far-red SIF and gross-primary-productivity-partitioned (GPP) eddy covariance data at diurnal and synoptic scales during the growing season (July–August 2017). Our primary objective is to summarize the site-level state of the art in TBM–SIF modeling over a relatively short time period (summer) when light, canopy structure, and pigments are similar, setting the stage for regional- to global-scale analyses. We find that these models are generally well constrained in simulating photosynthetic yield but show strongly divergent patterns in the simulation of absorbed photosynthetic active radiation (PAR), absolute GPP and fluorescence, quantum yields, and light response at the leaf and canopy scales. This study highlights the need for mechanistic modeling of nonphotochemical quenching in stressed and unstressed environments and improved the representation of light absorption (APAR), distribution of light across sunlit and shaded leaves, and radiative transfer from the leaf to the canopy scale.