Deforestation intensifies daily temperature variability in the northern extratropics.

Deforestation intensifies daily temperature variability in the northern extratropics.
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DOI:
10.1038/s41467-022-33622-0
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发表时间:
2022-10-10
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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虽然砍伐森林对平均温度和极端温度的生物地理物理影响被广泛记录在案,但森林砍伐如何影响温度变异性在很大程度上仍不清楚。为了填补这一认识空白,我们基于多个地球系统模型和现场观测,研究了理想化的森林砍伐对全球尺度上的日温度变率的生物地球物理影响。在这里,我们表明,砍伐森林可以加剧北部温带地区的日温度变率(最高可达20%),特别是在冬季,导致更频繁的快速极端变暖和降温事件。较高的温度变率可以归因于近地表水平温度平流的增强,同时地面感热通量的较低变率也部分抵消了这一变化。我们还展示了日温度变化对历史上的森林砍伐和未来潜在的植树造林的响应。这项研究揭示了森林砍伐或植树造林对温度变异性的被忽视的影响,并对北方温带国家的大规模植树造林具有启示意义。一项新的研究发现,北部温带地区的森林砍伐可以通过生物地球物理过程加强水平温度平流,导致当地每日温度变率更高,特别是在冬季。
While the biogeophysical effects of deforestation on average and extreme temperatures are broadly documented, how deforestation influences temperature variability remains largely unknown. To fill this knowledge gap, we investigate the biogeophysical effects of idealized deforestation on daily temperature variability at the global scale based on multiple earth system models and in situ observations. Here, we show that deforestation can intensify daily temperature variability (by up to 20%) in the northern extratropics, particularly in winter, leading to more frequent rapid extreme warming and cooling events. The higher temperature variability can be attributed to the enhanced near-surface horizontal temperature advection and simultaneously is partly offset by the lower variability in surface sensible heat flux. We also show responses of daily temperature variability to historical deforestation and future potential afforestation. This study reveals the overlooked effects of deforestation or afforestation on temperature variability and has implications for large-scale afforestation in northern extratropic countries. A new study finds that deforestation in the northern extratropics can enhance horizontal temperature advection through biogeophysical processes, leading to higher local daily temperature variability, particularly in winter.
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