A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models

A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models
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全球湿地甲烷排放和大气化学传输模型的不确定性数据集

DOI:
10.5194/gmd-2016-224
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发表时间:
2016
期刊:
Geoscientific Model Development Discussions
影响因子:
--
通讯作者:
D. Jacob
D. Jacob
中科院分区:
--
文献类型:
--
作者:
A. Bloom;K. Bowman;Meemong Lee;A. Turner;R. Schroeder;J. Worden;R. Weidner;K. McDonald;D. Jacob

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湿地排放仍然是全球大气甲烷(CH 4)收支不确定性的主要来源之一,这主要是由于对涝渍土壤中CH 4生产的过程控制不佳。基于过程的全球湿地甲烷排放量估计及其相关的不确定性可为基于模型的自上而下的甲烷排放量估计提供关键的先验信息。在这里,我们构建了一个全球湿地CH 4排放模式合奏用于大气化学传输模式。我们的0.5°×0.5°分辨率模式集合是基于卫星导出的地表水范围和降水再分析,(八个碳循环模型和一个受数据约束的陆地碳循环分析)和2009-2010年期间三个温度参数化;一个扩展的集合子集-仅基于降水量和数据约束的陆地碳循环分析-是为2001 - 2015年得出的。我们将全面和扩展模型合奏的平均值纳入GEOS-Chem,并将大气CH 4的表面测量值与模型进行比较;模型性能(站点水平和纬向平均异常残差)与已发布的湿地CH 4排放情景相比较为有利。我们发现,碳分解率和湿地范围的不确定性占25的时间,幅度和季节性变化的湿地甲烷排放的主要不确定性的80%以上,虽然在温度的不确定性CH 4:C的依赖是一个显着的Geosci。模型开发讨论。doi:10.5194/gmd-2016-224,2016 Mandarin pt正在为Geosci杂志进行审查。模型开发Published:7 September 2016 c © Author(s)2016. CC-BY 3.0许可证。
Wetland emissions remain one of the principal sources of uncertainty in the global atmospheric methane (CH4) budget, largely due to poorly constrained process controls on CH4 production in waterlogged soils. Process-based estimates of global wetland CH4 emissions and their associated uncertainties can provide crucial prior information for model-based top-down CH4 emission 15 estimates. Here we construct a global wetland CH4 emission model ensemble for use in atmospheric chemical transport models. Our 0.5°×0.5° resolution model ensemble is based on satellite-derived surface water extent and precipitation re-analyses, nine heterotrophic respiration simulations (eight carbon cycle models and a data-constrained terrestrial carbon cycle analysis) and three temperature parameterizations for the period 2009-2010; an extended ensemble subset – based solely on 20 precipitation and the data-constrained terrestrial carbon cycle analysis – is derived for the period 20012015. We incorporate the mean of the full and extended model ensembles into GEOS-Chem and compare model against surface measurements of atmospheric CH4; model performance (site-level and zonal mean anomaly residuals) compares favourably against published wetland CH4 emissions scenarios. We find that uncertainties in carbon decomposition rates and wetland extent together account 25 for more than 80% of the primary uncertainty in the timing, magnitude and seasonal variability of wetland CH4 emissions, although uncertainty in the temperature CH4:C dependence is a significant Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-224, 2016 Manuscript under review for journal Geosci. Model Dev. Published: 7 September 2016 c © Author(s) 2016. CC-BY 3.0 License.
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发表时间: 2015-01-01
期刊: BIOGEOSCIENCES
影响因子: 4.9
作者:
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