Solar geoengineering can alleviate climate change pressures on crop yields
Solar geoengineering can alleviate climate change pressures on crop yields
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DOI：
10.1038/s43016-021-00278-w
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发表时间：
2021-05-20
期刊：
影响因子：
23.2
通讯作者：
Keith, David
中科院分区：
文献类型：
--
作者：
Fan, Yuanchao;Tjiputra, Jerry;Keith, David
太阳能地球工程（SG）和二氧化碳减排都可以缓解人为气候变化，但它们对粮食安全的影响尚未完全了解。使用地球系统模型中的先进作物模型，我们分析了六种主要作物对三种SG技术（SG）和减排的产量响应，当它们提供大致相同的辐射强迫减少并假设相同的土地利用时。我们发现，在辐射，水分和CO2的变化有明显不同的产量反应，但相当显着的冷却效益作物产量的所有四种方法。总体而言，全球产量在三个SG下增加了10%，在减排下减少了5%，后者主要是由于减少了CO2施肥，相对于世纪后期的业务照常。相对湿度主导了水文对作物产量的影响，降水的贡献很小。与以前的研究结果相反，在所有SG中，净日照效应可以忽略不计。
Solar geoengineering (SG) and CO2 emissions reduction can each alleviate anthropogenic climate change, but their impacts on food security are not yet fully understood. Using an advanced crop model within an Earth system model, we analysed the yield responses of six major crops to three SG technologies (SGs) and emissions reduction when they provide roughly the same reduction in radiative forcing and assume the same land use. We found sharply distinct yield responses to changes in radiation, moisture and CO2, but comparable significant cooling benefits for crop yields by all four methods. Overall, global yields increase similar to 10% under the three SGs and decrease 5% under emissions reduction, the latter primarily due to reduced CO2 fertilization, relative to business as usual by the late twenty-first century. Relative humidity dominates the hydrological effect on yields of rainfed crops, with little contribution from precipitation. The net insolation effect is negligible across all SGs, contrary to previous findings.