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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An estimate of monthly global emissions of anthropogenic CO_2: Impact on the seasonal cycle of atmospheric CO_2
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An estimate of monthly global emissions of anthropogenic CO_2: Impact on the seasonal cycle of atmospheric CO_2

机译：人为CO_2每月全球排放量的估计：对大气CO_2季节性周期的影响

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摘要

Monthly estimates of the global emissions of anthropogenic CO2 are presented. Approximating the seasonal CO2 emission cycle using a 2-harmonic Fourier series with coefficients as a function of latitude, the annual fluxes are decomposed into monthly flux estimates based on data for the United States and applied globally. These monthly anthropogenic CO2 flux estimates are then used to model atmospheric CO2 concentrations using meteorological fields from the NASA GEOS-4 data assimilation system. We find that the use of monthly resolved fluxes makes a significant difference in the seasonal cycle of atmospheric CO2 in and near those regions where anthropogenic CO2 is released to the atmosphere. Local variations of 2–6 ppmv CO2 in the seasonal cycle amplitude are simulated; larger variations would be expected if smaller source-receptor distances could be more precisely specified using a more refined spatial resolution. We also find that in the midlatitudes near the sources, synoptic scale atmospheric circulations are important in the winter and that boundary layer venting and diurnal rectifier effects are more important in the summer. These findings have implications for inverse-modeling efforts that attempt to estimate surface source/sink regions especially when the surface sinks are colocated with regions of strong anthropogenic CO2 emissions.
机译：列出了全球人为二氧化碳排放量的月度估算值。使用系数为纬度的2-谐波傅立叶级数来近似季节性CO2排放周期，年通量根据美国数据分解为月通量估计值，并在全球范围内应用。然后使用来自NASA GEOS-4数据同化系统的气象场，将这些每月人为产生的CO2通量估算值用于模拟大气中的CO2浓度。我们发现，使用月解析通量在人为二氧化碳释放到大气的那些区域内及其附近的大气二氧化碳的季节性循环中具有显着差异。模拟了季节性周期振幅中2–6 ppmv CO2的局部变化;如果可以使用更精细的空间分辨率更精确地指定更小的源-受体距离，则可以预期会有更大的变化。我们还发现，在震源附近的中纬度地区，天气尺度的大气环流在冬季很重要，边界层的通风和昼夜整流效应在夏季更为重要。这些发现对反建模工作具有影响，这些工作试图估计地表源/汇区，特别是当地表汇区与人为二氧化碳排放量较大的区域并置时。

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