Representing subgrid‐scale edaphic heterogeneity in a large‐scale ecosystem model: A case study in the circumpolar boreal regions
Representing subgrid‐scale edaphic heterogeneity in a large‐scale ecosystem model: A case study in the circumpolar boreal regions
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代表大规模生态系统模型中的亚网格尺度土壤异质性：环极地北方地区的案例研究
DOI：
10.1029/2008gl035701
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发表时间：
2008
影响因子：
5.2
通讯作者：
Hisashi Sato
中科院分区：
文献类型：
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作者：
T. Ise;Hisashi Sato
陆地生态过程与气候之间存在强烈的反馈相互作用。然而，由于没有充分考虑当地环境变化，许多大规模生态系统模型和耦合气候模型尚未充分再现植被动态。通过估计大型网格单元内的次网格规模生态系统生产力潜力，我们明确地将局部土壤异质性纳入空间显式基于个体的动态全球植被模型（SEIB-DGVM）。我们假设高分辨率土地覆盖数据反映了源自土壤变化的潜在生态系统生产力潜力。我们将高分辨率全球土地覆盖 2000 数据库 (GLC2000) 像素分为高、中、低生产力潜力，并在 DGVM 网格上获得了这些潜力的覆盖分数。然后，我们对具有高、中、低光合能力的环极寒带地区进行了瞬态动态植被模拟。使用生产力潜力作为权重，我们估计了总叶面积指数（LAI），该指数整合了每个 DGVM 网格的较小规模变化。使用地面观测和遥感产品来评估模型性能。模拟 LAI 的区域格局显着改善，特别是北美北方地区。欧亚大陆北部的改进很小，这表明 GLC2000 的定性分类是对我们方法的关键控制。结果表明，即使对亚网格尺度异质性的相当简单的考虑也可以显着改善大规模模拟。
Strong feedback interactions occur between terrestrial ecological processes and climate. However, vegetation dynamics have not been adequately reproduced by many large‐scale ecosystem models and coupled climate models because local environmental variations are not sufficiently considered. By estimating subgrid‐scale ecosystem productivity potentials within large grid cells, we explicitly incorporated local edaphic heterogeneity into the Spatially Explicit Individual‐Based Dynamic Global Vegetation Model (SEIB‐DGVM). We assumed that high‐resolution land cover data reflected the underlying ecosystem productivity potentials originating from edaphic variations. We categorized high‐resolution Global Land Cover 2000 database (GLC2000) pixels into high, intermediate, and low productivity potentials and obtained fractional cover of these potentials on a DGVM grid. Then we performed transient dynamic vegetation simulations on circumpolar boreal regions with high, intermediate, and low photosynthetic capacities. Using the productivity potentials as weight, we estimated total leaf area index (LAI) that integrates the smaller‐scale variation of each DGVM grid. Ground‐based observations and a remote sensing product were used to evaluate the model performance. The regional pattern of simulated LAI was significantly improved, especially for the North American boreal regions. Improvement was minor for northern Eurasia, suggesting the qualitative classification by GLC2000 was the critical control on our approach. The results suggested that even a rather simplistic consideration of subgrid‐scale heterogeneity could significantly improve large‐scale simulations.
在地球模拟器上开发综合地球系统模型
DOI：
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发表时间：
2005
期刊：
Journal of the earth Simulator Vol.4
影响因子：
--
作者：
Tomita;T.;M.Nonaka;M.Gauss;Michio Kawamiya
通讯作者：
Michio Kawamiya