Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15336 |
Global variation in diurnal asymmetry in temperature, cloud cover, specific humidity and precipitation and its association with leaf area index | |
Daniel T. C. Cox; Ilya M. D. Maclean; Alexandra S. Gardner; Kevin J. Gaston | |
2020-09-30 | |
发表期刊 | Global Change Biology
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出版年 | 2020 |
英文摘要 | The impacts of the changing climate on the biological world vary across latitudes, habitats and spatial scales. By contrast, the time of day at which these changes are occurring has received relatively little attention. As biologically significant organismal activities often occur at particular times of day, any asymmetry in the rate of change between the daytime and night‐time will skew the climatic pressures placed on them, and this could have profound impacts on the natural world. Here we determine global spatial variation in the difference in the mean annual rate at which near‐surface daytime maximum and night‐time minimum temperatures and mean daytime and mean night‐time cloud cover, specific humidity and precipitation have changed over land. For the years 1983–2017, we derived hourly climate data and assigned each hour as occurring during daylight or darkness. In regions that showed warming asymmetry of >0.5°C (equivalent to mean surface temperature warming during the 20th century) we investigated corresponding changes in cloud cover, specific humidity and precipitation. We then examined the proportional change in leaf area index (LAI) as one potential biological response to diel warming asymmetry. We demonstrate that where night‐time temperatures increased by >0.5°C more than daytime temperatures, cloud cover, specific humidity and precipitation increased. Conversely, where daytime temperatures increased by >0.5°C more than night‐time temperatures, cloud cover, specific humidity and precipitation decreased. Driven primarily by increased cloud cover resulting in a dampening of daytime temperatures, over twice the area of land has experienced night‐time warming by >0.25°C more than daytime warming, and has become wetter, with important consequences for plant phenology and species interactions. Conversely, greater daytime relative to night‐time warming is associated with hotter, drier conditions, increasing species vulnerability to heat stress and water budgets. This was demonstrated by a divergent response of LAI to warming asymmetry. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/297844 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Daniel T. C. Cox,Ilya M. D. Maclean,Alexandra S. Gardner,et al. Global variation in diurnal asymmetry in temperature, cloud cover, specific humidity and precipitation and its association with leaf area index[J]. Global Change Biology,2020. |
APA | Daniel T. C. Cox,Ilya M. D. Maclean,Alexandra S. Gardner,&Kevin J. Gaston.(2020).Global variation in diurnal asymmetry in temperature, cloud cover, specific humidity and precipitation and its association with leaf area index.Global Change Biology. |
MLA | Daniel T. C. Cox,et al."Global variation in diurnal asymmetry in temperature, cloud cover, specific humidity and precipitation and its association with leaf area index".Global Change Biology (2020). |
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