Ozone-induced gross primary productivity reductions over European forests inferred from satellite observations-猫眼课题宝

DOI：

10.5194/bg-2021-125

发表时间：

2021-05

期刊：

Biogeosciences Discussions

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Anand;A. Anav;M. Vitale;D. Peano;N. Unger;X. Yue;R. Parker;H. Boesch

抽象。对流层O3损害叶片，直接抑制光合作用，对陆地碳汇构成威胁。以前的调查大多依赖于稀疏的原位数据或模拟使用陆面模型。这项工作是第一次使用卫星数据来量化O3暴露对总初级生产力（GPP）的影响。在2003-2015年期间，沿沿着南北样带的欧洲森林中，O3引起的GPP减少估计在0.36-9.55%之间变化，与先前的估计一致。没有显着的时间趋势，可以确定在欧洲大部分地区，而随机森林分析（RFA）表明，土壤水分是一个重要的变量，管理全球生产力减少地中海。这项工作和耶鲁互动生物圈（YIBs）模型模拟的GPP减少之间的比较表明，在地中海地区基于卫星的估计可能会有+12%的偏差，可能是因为模拟气孔对土壤水分和之前的O3暴露的敏感性的差异。这项工作首次表明，基于卫星的数据集可以用来评估臭氧对陆地碳汇的影响，这与现场或基于模型的分析是可比的。

Abstract. Tropospheric O3 damages leaves and directly inhibits photosynthesis, posing a threat to terrestrial carbon sinks. Previous investigations have mostly relied on sparse in-situ data or simulations using land surface models. This work is the first to use satellite data to quantify the effect of O3 exposure on gross primary productivity (GPP). O3-induced GPP reductions were estimated to vary between 0.36–9.55% across European forests along a North-South transect between 2003–2015, in line with prior estimates. No significant temporal trend could be determined over most of Europe, while Random Forest analysis (RFA) shows that soil moisture is a significant variable governing GPP reductions over the Mediterranean. Comparisons between this work and GPP reductions simulated by the Yale Interactive Biosphere (YIBs) model suggest that satellite-based estimates over the Mediterranean region may be biased by +12%, potentially because of differences in modelling stomatal sensitivity to soil moisture and prior O3 exposure. This work has demonstrated for the first time that satellite-based datasets can be leveraged to assess the impact of O3 on the terrestrial carbon sink, which are comparable with in-situ or model-based analyses.

Ozone-induced gross primary productivity reductions over European forests inferred from satellite observations

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