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Diverse variations in middle and high latitudes of the Northern Hemisphere spring phenology sensitivity to diurnal temperature during 1982–2015
International Journal of Climatology ( IF 3.5 ) Pub Date : 2022-08-07 , DOI: 10.1002/joc.7827
Guorong Deng 1, 2, 3 , Hongyan Zhang 1, 2 , Jianjun Zhao 1, 2 , Xiaoyi Guo 1, 2 , Ehsan Biniyaz 3 , Hang Zhao 1, 2 , Dan Guo 4 , Rihan Wu 1, 2 , Hui Li 1, 2
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Recent studies have revealed that the influence of diurnal temperature on spring phenology is asymmetric, and the faster night-time warming in the Northern Hemisphere (NH) has a complex impact on spring phenology. Our understanding from the sensitivity of the start of the growing season (SOS) to daytime (ST_daytime) and night-time temperatures (ST_night-time) has urgently needs to be improved. In this study, the SOS sensitivity to diurnal temperature in the middle and high latitudes of the NH (>30°N) from 1982 to 2015 is estimated. The results indicate that although SOS showed stronger sensitivity to daytime than night-time temperature in most parts of the study areas, the influence of daytime temperature on SOS is decreasing, while the influence of night-time temperature on SOS is increasing. The variations in ST_daytime and ST_night-time along the latitude gradient were significantly correlated with the warming rate of the preseason diurnal temperature (p < .01). The SOS between 40°N and 70°N was more sensitive to daytime temperature, while ST_night-time was higher than ST_daytime at other latitudes due to topography and rapid night-time warming. On the altitude gradient, the SOS was more sensitive to daytime temperature in areas below 800 and 2,000–4,000 m. ST_night-time exceeded ST_daytime at other altitudes owing to night-time warming relief of the severe restrictions on phenological processes and the reduction in frost risk. To reach a comprehensive characterization of the interaction between vegetation and climate systems, the current study suggests more investigation on the response of SOS to diurnal temperature on large scales.

中文翻译:

1982-2015年北半球春季物候对昼夜温度敏感性的中高纬度差异变化

最近的研究表明,昼夜温度对春季物候的影响是不对称的,北半球(NH)夜间变暖更快对春季物候产生复杂的影响。我们从生长季节开始 (SOS) 对白天 (S T _daytime) 和夜间温度 (S T_night-time) 急需改进。本研究估算了1982-2015年北半球中高纬度地区(>30°N)SOS对昼夜温度的敏感性。结果表明,尽管研究区大部分地区SOS对白天温度的敏感性高于夜间温度,但白天温度对SOS的影响在减小,而夜间温度对SOS的影响在增加。S T _daytime 和 S T _night-time 沿纬度梯度的变化与季前昼夜温度的升温速率显着相关 ( p  < .01)。40°N和70°N之间的SOS对白天温度更敏感,而S T _night-time高于S由于地形和夜间快速变暖,其他纬度的 T_daytime 在海拔梯度上,SOS在800米以下和2000-4000米以下地区对日间温度更为敏感。由于夜间变暖解除了对物候过程的严格限制和霜冻风险的降低,其他海拔高度的S T _night-time 超过了 S T _daytime。为了全面表征植被与气候系统之间的相互作用,目前的研究建议对 SOS 对大尺度昼夜温度的响应进行更多调查。
更新日期:2022-08-07
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