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首页> 外文期刊>Atmospheric chemistry and physics >Analysis of temporal and spatial variability of atmospheric CO2 concentration within Paris from the GreenLITE (TM) laser imaging experiment
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Analysis of temporal and spatial variability of atmospheric CO2 concentration within Paris from the GreenLITE (TM) laser imaging experiment

机译：从聚光（TM）激光成像实验中巴黎大气CO2浓度的时间和空间变异分析

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摘要

In 2015, the Greenhouse gas Laser Imaging Tomography Experiment (GreenLITET) measurement system was deployed for a long-duration experiment in the center of Paris, France. The system measures near-surface atmospheric CO2 concentrations integrated along 30 horizontal chords ranging in length from 2.3 to 5.2 km and covering an area of 25 km(2) over the complex urban environment. In this study, we use this observing system together with six conventional in situ point measurements and the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) and two urban canopy schemes (Urban Canopy Model - UCM; Building Effect Parameterization - BEP) at a horizontal resolution of 1 km to analyze the temporal and spatial variations in CO2 concentrations within the city of Paris and its vicinity for the 1-year period spanning December 2015 to November 2016. Such an analysis aims at supporting the development of CO2 atmospheric inversion systems at the city scale. Results show that both urban canopy schemes in the WRF-Chem model are capable of reproducing the seasonal cycle and most of the synoptic variations in the atmospheric CO2 point measurements over the suburban areas as well as the general corresponding spatial differences in CO2 concentration that span the urban area. However, within the city, there are larger discrepancies between the observations and the model results with very distinct features during winter and summer. During winter, the GreenLITE (TM) measurements clearly demonstrate that one urban canopy scheme (BEP) provides a much better description of temporal variations and horizontal differences in CO2 concentrations than the other (UCM) does. During summer, much larger CO2 horizontal differences are indicated by the GreenLITE (TM) system than both the in situ measurements and the model results, with systematic east-west variations.
机译：2015年，部署了温室气体激光成像断层扫描实验（Greenlitet）测量系统，在法国巴黎的中心进行了长期实验。该系统测量沿30个水平和弦集成的近地表大气二氧化碳浓度从2.3到5.2公里的长度范围内，并在复杂的城市环境中覆盖25公里（2）米。在这项研究中，我们将该观察系统与六种常规的原位点测量和与化学（WRF-Chem）和两个城市冠层方案（UCM）的天气研究和预测模型一起使用以1公里的水平分辨率分析了2015年12月至11月跨越巴黎市内部及其附近的CO2浓度的时间和空间变化。这样的分析旨在支持CO2大气反转的发展在城市规模的系统。结果表明，WRF-Chem模型中的两个城市冠层计划能够在郊区的大气中的季节性周期和大部分概要变化中，以及跨越的二氧化碳浓度的一般相应的空间差异市区。然而，在城市内，观察与模型之间存在较大的差异，并且在冬季和夏季具有非常不同的功能。在冬季，Greenlite（TM）测量清楚地表明，一个城市冠层方案（BEP）提供了比其他（UCM）的时间变化和CO2浓度水平差异的更好描述。在夏季，Greenlite（TM）系统指示比原位测量和模型结果的更大的CO 2水平差异，系统地区的东西差异。

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