Simple Diagnostic Biosphere Model (SDBM)

The model is based on the approach of Monteith[ 1972, 1977] and Kumar and Monteith [ 1981].It considers in stantaneous NPP (called P in the formulae) as a fraction of the incoming solar energy stored in to organic dry matter.

carbon cycle data assimilationterrestrial biosphereuncertainty analysis



Initial contribute: 2019-04-26


Method-focused categoriesProcess-perspectivePhysical process calculation
Method-focused categoriesProcess-perspectiveBiological process calculation

Detailed Description

English {{currentDetailLanguage}} English

    In brief,the model calculates a pure seasonal cycle of net biosphere–atmosphere fluxes as the difference of two fluxes inany month at each land grid cell,

F = H - NPP

where F is the net flux to the atmosphere, H is the heterotrophic respiration, and NPP is the net primary productivity.

    The calculation is performed on the basis of measured Normalized Differential Vegetation Index (NDVI), incoming solar radiation, and surface temperature. There is an additional time-dependent water-stress term a, which may limit the efficiency either of NPP, or heterotrophic respiration, or both. This factor will be included in various of the calculations in this work in either of the two fluxes H and NPP; in the case described below, it is included in both.

    NPP is calculated for each month as

where APAR is absorbed photosynthetically active radiation and is a light-use efficiency parameter. APAR is computed from NDVI data by Gallow [1992] and incoming solar radiation inferred from cloudiness data by Leemans and Cramer [1991] using the method of Linacre [1968].

    Heterotrophic respiration H is calculated as an exponential function of temperature as

where is the heterotrophic respiration rate at T = 0 and  (i.e., no water stress) and Q10 is the ratio of respiration at T + 10 to that at T; T is given in °C. We have absorbed into the formulation of H for later convenience.

    In order to ensure a balanced biosphere (no net annual flux), we rescale H0 at each grid cell so that integrated NPP and H are equal over a year. Thus H0 is not a free parameter.

    The water-stress factor, a = AET/PET (actual divided by potential evapotranspiration), is computed with the model of Prentice et al. [1993]. PET is assumed equal to equilibrium evapotranspiration, and AET is the minimum of PET and a supply rate assumed proportional to soil moisture. The model neglects the effect of soil freezing and snow accumulation, so that at low ambient temperatures where PET is mostly small, a tends toward 1. Freezing-induced drought effects are therefore not considered in SDBM; low temperatures rather affect H through its temperature dependence given by the value of Q10.

    We can now write the total flux as

    Subject to the constraint that

where integrals are taken over the annual cycle. Integrals are calculated as sums of monthly values weighted by the length of the month.







Zhiyi Zhu (2019). Simple Diagnostic Biosphere Model (SDBM), Model Item, OpenGMS,


Initial contribute : 2019-04-26


QR Code


{{'; ')}}



Drop the file here, orclick to upload.
Select From My Space
+ add


Cancel Submit
{{htmlJSON.Cancel}} {{htmlJSON.Submit}}
{{htmlJSON.Localizations}} + {{htmlJSON.Add}}
{{ item.label }} {{ item.value }}
{{htmlJSON.Cancel}} {{htmlJSON.Submit}}
名称 别名 {{tag}} +
系列名 版本号 目的 修改内容 创建/修改日期 作者
摘要 详细描述
{{tag}} + 添加关键字
* 时间参考系
* 空间参考系类型 * 空间参考系名称

起始日期 终止日期 进展 开发者
* 是否开源 * 访问方式 * 使用方式 开源协议 * 传输方式 * 获取地址 * 发布日期 * 发布者

编号 目的 修改内容 创建/修改日期 作者

时间分辨率 时间尺度 时间步长 时间范围 空间维度 格网类型 空间分辨率 空间尺度 空间范围
{{tag}} +
* 类型

* 名称 * 描述
示例描述 * 名称 * 类型 * 值/链接 上传

{{htmlJSON.Cancel}} {{htmlJSON.Submit}}
Title Author Date Journal Volume(Issue) Pages Links Doi Operation
{{htmlJSON.Cancel}} {{htmlJSON.Submit}}
{{htmlJSON.Add}} {{htmlJSON.Cancel}}


Authors:  {{articleUploading.authors[0]}}, {{articleUploading.authors[1]}}, {{articleUploading.authors[2]}}, et al.

Journal:   {{articleUploading.journal}}

Date:   {{}}

Page range:   {{articleUploading.pageRange}}

Link:   {{}}

DOI:   {{articleUploading.doi}}

Yes, this is it Cancel

The article {{articleUploading.title}} has been uploaded yet.

{{htmlJSON.Cancel}} {{htmlJSON.Confirm}}