Sino-French Institute for Earth System Science, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.
Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China.
Nat Commun. 2018 Jan 30;9(1):426. doi: 10.1038/s41467-017-02690-y.
While climate warming reduces the occurrence of frost events, the warming-induced lengthening of the growing season of plants in the Northern Hemisphere may actually induce more frequent frost days during the growing season (GSFDs, days with minimum temperature < 0 °C). Direct evidence of this hypothesis, however, is limited. Here we investigate the change in the number of GSFDs at latitudes greater than 30° N using remotely-sensed and in situ phenological records and three minimum temperature (T) data sets from 1982 to 2012. While decreased GSFDs are found in northern Siberia, the Tibetan Plateau, and northwestern North America (mainly in autumn), ~43% of the hemisphere, especially in Europe, experienced a significant increase in GSFDs between 1982 and 2012 (mainly during spring). Overall, regions with larger increases in growing season length exhibit larger increases in GSFDs. Climate warming thus reduces the total number of frost days per year, but GSFDs nonetheless increase in many areas.
虽然气候变暖减少了霜期的发生，但气候变暖导致北半球植物生长季的延长实际上可能导致生长季（GSFD，日最低温度 < 0°C）期间更频繁的霜期。然而，这一假设的直接证据有限。本研究利用遥感和实地物候记录以及 1982 年至 2012 年的三个最低温度（T）数据集，研究了纬度大于 30°N 的地区 GSFD 数量的变化。尽管在西伯利亚北部、青藏高原和北美西北部（主要在秋季）发现 GSFD 减少，但在 1982 年至 2012 年期间，约占半球 43%的地区，特别是欧洲，GSFD 显著增加（主要在春季）。总体而言，生长季长度增加较大的地区 GSFD 增加幅度也较大。因此，气候变暖减少了每年的霜日总数，但在许多地区 GSFD 仍在增加。
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