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Impacts of 2°C global warming on primary production and soil carbon storage capacity at pan-European level

机译：全球升温2°C对泛欧洲一级生产和土壤碳储量的影响

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Atmospheric CO2 has been dramatically increasing since beginning of the industrial time (i.e. 1860), being one of the main driver for climate change at regional and global level. The change in CO2 concentration in the atmosphere, together with that of temperature, precipitation and/or so radiation, can influence the biogeochemical cycles in all ecosystems. In this study, we investigate the combined effect of CO2 concentration and six climate variables on carbon uptake, i.e., gross primary production (GPP) and carbon storage, i.e, soil carbon (SoilC) in terrestrial biosphere by using the Community Land Model (CLM vers. 4.5) and evaluate the model’s results against available observation data. We also analysed the change in carbon uptake and storage under a 2°C global mean warming. Results show that the model performed reasonably well for GPP and SoilC at pan-European scale. We also found a positive correlation between GPP, precipitation and surface wind, and a negative correlation between GPP and surface downwelling longwave radiation (rlds). Under a 2°C global warming, GPP and SoilC show an increase, an average, of about 20%, and 5% at pan-European scale, respectively. However, our results indicate that CLM4.5 may need improvements particularly in carbon-nitrogen interaction and carbon accumulation in soil.
机译：自工业时代（即1860年）开始以来，大气中的CO 2 急剧增加，是区域和全球范围内气候变化的主要驱动力之一。大气中CO 2 浓度的变化，以及温度，降水和/或辐射的变化，都可能影响所有生态系统的生物地球化学循环。在这项研究中，我们调查了CO 2 浓度和六个气候变量对陆地生物圈碳吸收（即总初级生产（GPP）和碳储存，即土壤碳（SoilC））的综合影响通过使用社区土地模型（CLM第4.5版），并根据可用的观测数据评估模型的结果。我们还分析了全球平均升温2°C下碳吸收和储存的变化。结果表明，该模型在GPP范围内对GPP和SoilC表现良好。我们还发现GPP，降水和地表风之间呈正相关，而GPP与地表下行长波辐射（rlds）之间呈负相关。在2°C的全球变暖下，GPP和SoilC在泛欧洲范围内平均分别增加约20％和5％。但是，我们的结果表明CLM4.5可能需要改进，尤其是在土壤中的碳氮相互作用和碳积累方面。

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