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The influence of two land‐surface hydrology schemes on the terrestrial carbon cycle of Africa: A regional climate model study
International Journal of Climatology ( IF 3.9 ) Pub Date : 2020-07-20 , DOI: 10.1002/joc.6762
Samy A. Anwar 1 , Ismaila Diallo 2
Affiliation  

Two 16‐year simulations were conducted to study the influence of two runoff schemes [the default one is TOPMODEL (hereafter referred as TOP) and the other one is the variable infiltration capacity (VIC)] with vegetation is being interactive [by enabling the carbon–nitrogen (CN) module] on the terrestrial carbon cycle fluxes of Africa using the regional climate model—RegCM4. The first simulation was labelled as CN‐TOP, while the second simulation was hereafter referred to as CN‐VIC. The results were evaluated and compared against various observation‐based satellites and reanalysis products. Results showed that the CN‐TOP overestimates leaf area index (LAI) and slightly underestimates the terrestrial carbon fluxes in comparison with the reference product; meanwhile, the CN‐VIC severely underestimates both LAI and terrestrial fluxes particularly over the Congo basin. In addition, the CN‐VIC shows a superior performance for simulating the net ecosystem exchange (NEE) than when it is simulated by the CN‐TOP. In summary, the coupled RegCM4‐CLM45‐CN‐VIC model can be recommended for future studies of NEE over Africa. To obtain robust results for simulating the terrestrial carbon fluxes especially the NEE; it is highly recommended to calibrate the four parameters of the VIC surface data set over Africa particularly over the Congo basin against in‐situ observations.

中文翻译:

两种陆面水文计划对非洲陆地碳循环的影响:区域气候模型研究

进行了两个为期16年的模拟,以研究两种径流方案的影响[默认方案为TOPMODEL(以下简称TOP),另一方案为变量入渗量(VIC)],植被与植被相互作用[通过启用碳-氮(CN)模块]使用区域气候模型RegCM4研究非洲的陆地碳循环通量。第一个模拟被标记为CN-TOP,而第二个模拟在下文中被称为CN-VIC。对结果进行了评估,并与各种基于观测的卫星和再分析产品进行了比较。结果表明,与参考产品相比,CN-TOP高估了叶面积指数(LAI),而低估了陆地碳通量。与此同时,CN‐VIC严重低估了LAI和地面通量,特别是在刚果盆地上空。此外,CN-VIC在模拟净生态系统交换(NEE)方面表现出比CN-TOP模拟更出色的性能。总之,可以建议将RegCM4-CLM45-CN-VIC耦合模型用于非洲地区NEE的未来研究。为模拟陆地碳通量(尤其是NEE)获得可靠的结果;强烈建议根据现场观测值校准整个非洲(尤其是刚果盆地)的VIC表面数据集的四个参数。推荐将耦合的RegCM4-CLM45-CN-VIC模型用于非洲的NEE的未来研究。为模拟陆地碳通量(尤其是NEE)获得可靠的结果;强烈建议根据现场观测值校准整个非洲(尤其是刚果盆地)的VIC表面数据集的四个参数。建议将耦合的RegCM4-CLM45-CN-VIC模型用于非洲的NEE未来研究。为模拟陆地碳通量(尤其是NEE)获得可靠的结果;强烈建议根据现场观测值校准整个非洲(尤其是刚果盆地)的VIC表面数据集的四个参数。
更新日期:2020-07-20
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