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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Combined Simple Biosphere/Carnegie-Ames-Stanford Approach terrestrial carbon cycle model
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Combined Simple Biosphere/Carnegie-Ames-Stanford Approach terrestrial carbon cycle model

机译:简单生物圈/卡内基-埃姆斯-斯坦福方法相结合的陆地碳循环模型

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摘要

Biogeochemical models must include a broad variety of biological and physical processes to test our understanding of the terrestrial carbon cycle and to predict ecosystem biomass and carbon fluxes. We combine the photosynthesis and biophysical calculations in the Simple Biosphere model, Version 2.5 (SiB2.5) with the biogeochemistry from the Carnegie-Ames-Stanford Approach (CASA) model to create SiBCASA, a hybrid capable of estimating terrestrial carbon fluxes and biomass from diurnal to decadal timescales. We add dynamic allocation of Gross Primary Productivity to the growth and maintenance of leaves, roots, and wood and explicit calculation of autotrophic respiration. We prescribe leaf biomass using Leaf Area Index (LAI) derived from remotely sensed Normalized Difference Vegetation Index. Simulated carbon fluxes and biomass are consistent with observations at selected eddy covariance flux towers in the AmeriFlux network. Major sources of error include the steady state assumption for initial pool sizes, the input weather data, and biases in the LAI.
机译:生物地球化学模型必须包括各种各样的生物和物理过程,以检验我们对陆地碳循环的理解并预测生态系统的生物量和碳通量。我们将简单生物圈模型2.5版(SiB2.5)中的光合作用和生物物理计算与卡内基-艾姆斯-斯坦福方法(CASA)模型中的生物地球化学相结合,创建了SiBCASA,这是一种能够估算来自地球的碳通量和生物量的混合体日到十年的时间尺度。我们将总初级生产力的动态分配添加到叶,根和木材的生长和维持中,并显式计算自养呼吸。我们使用从遥感归一化差异植被指数得出的叶面积指数(LAI)来规定叶片生物量。模拟的碳通量和生物量与在AmeriFlux网络中选定的涡流协方差通量塔处观察到的一致。错误的主要来源包括初始池大小的稳态假设,输入的天气数据以及LAI中的偏差。

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