Diverse variations in middle and high latitudes of the Northern Hemisphere spring phenology sensitivity to diurnal temperature during 1982–2015,International Journal of Climatology

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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}

Affiliation

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 (S_T_daytime) and night-time temperatures (S_T_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 S_T_daytime and S_T_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 S_T_night-time was higher than S_T_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. S_T_night-time exceeded S_T_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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