Interplay of greening and ENSO on biosphere–atmosphere processes in Australia
Interplay of greening and ENSO on biosphere–atmosphere processes in Australia
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绿化和 ENSO 对澳大利亚生物圈-大气过程的相互作用
DOI：
10.1186/s40562-022-00252-9
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发表时间：
2022-11
影响因子：
4
通讯作者：
Zhenzhong Zeng
中科院分区：
文献类型：
--
作者：
Shijing Liang;Alan D. Ziegler;Laurent Z. X. Li;Jie Wu;Dashan Wang;Zhenzhong Zeng
陆地生态系统与气候是完全耦合的。地球一直在变绿，这是因为随着大气层的变化，植被生长增加，而大气层的变化反过来又对气候产生反馈。绿化减缓了全球陆地表面气温的上升，主要是通过同时增加蒸发蒸腾量和潮湿地区的降水量。在干旱地区，绿化加剧了由绿化增强蒸腾作用引起的土壤水分减少。然而，不确定的是，半干旱地区绿化的气候效应在不同的干湿条件下会有什么不同。在这里，我们专注于生物圈-大气的相互作用，在澳大利亚通过模拟扰动的植被变化下的各种状态的海表温度（SST），包括气候平均，厄尔尼诺现象，和拉尼娜条件。在厄尔尼诺的干旱条件下，绿化加剧了水的紧张，大大消耗了土壤水分，而在拉尼娜的潮湿条件下，绿化增加了蒸散和降水，补充了土壤水分。对于正常情况下，使用气候学平均SST，土壤水分发生了小的减少，但由于绿化引起的蒸散和降水的非均匀变化，空间对比度大。我们强调，由大规模气候变率调节的干湿交替条件对于理解气候对绿化的反应至关重要。此外，基于植被的减缓变暖政策在推断与绿化相关的独特气候效应时需要谨慎。
AbstractTerrestrial ecosystems are fully coupled with the climate. The planet has been greening owing to the increased vegetation growth in response to the changing atmosphere, which in turn has feedback on the climate. Greening has slowed down the rise in global land-surface air temperature mainly through a coincident increase of evapotranspiration and precipitation in wet regions. In dry regions, greening intensifies the decrease in soil moisture induced by greening-enhanced transpiration. Uncertain, however, is how the climate effects of greening in semi-arid lands might differ for variable wet and dry conditions. Here, we focus on the biosphere–atmosphere interactions in Australia by modeling the perturbation of vegetation changes under various states of sea surface temperature (SST), including the climatology mean, El Niño, andLa Niña conditions. For the dry conditions of El Niño, greening exacerbates water stress and largely depletes the soil moisture, while for the wet conditions of La Niña, greening-enhanced evapotranspiration and precipitation resupply the soil moisture. For the normal conditions using the climatology mean SST, a small decrease in soil moisture occurs but with large spatial contrast because of heterogeneous changes of evapotranspiration and precipitation induced by greening. We emphasize that the alternating dry and wet conditions modulated by the large-scale climate variability are vital to understanding the response of climate to greening. Furthermore, vegetation-based warming mitigation policies need to be cautious when inferring distinct climate effects associated with greening.
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影响因子：
5.3
作者：
通讯作者：
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影响因子：
2.7
作者：
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影响因子：
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影响因子：
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影响因子：
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