Greater temperature sensitivity of vegetation greenup onset date in areas with weaker temperature seasonality across the Northern Hemisphere

Miaogen Shen, Xiaolin Zhu, Dailiang Peng, Nan Jiang, Yan Huang, Jin Chen, Cong Wang, Wenwu Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

The temperature sensitivity (ST) of the vegetation greenup onset date (VGD) is critical for the assessment and prediction of phenological response to climate warming. Spatial variations in ST, though well documented based on satellite observations in recent studies, have remained largely under-explained. We determined VGD from satellite observation of the normalized difference vegetation index over the period 2000–2018 and showed that ST is substantially smaller in areas with stronger temperature seasonality (i.e. the multiyear mean of standard deviations of monthly mean temperature over a 12-month period). Spatially, ST averaged over each 2 °C bin of temperature seasonality increased from about −10.0 days K1 in areas with temperature seasonality of about 3.5 °C to about −3.3 to −2.3 days K1 in areas with temperature seasonality between 15.0 and 22.3 °C. Statistical analyses suggest that this pattern was not related with spatial variations in the length of chilling exposure, spring frost risk, inter-annual variability of spring temperature, or photoperiod. Rather, it may occur because areas with stronger temperature seasonality have stronger pre-VGD constraints because of a lower temperature and a faster temperature increase from the onset of greenup to summer, which could result in faster leaf development rates and thus higher speeds of completion of leaf development. Our results also show that the greater ST associated with higher mean annual temperature and multiyear mean VGD across the northern middle and high latitudes observed in previous studies is probably caused by temperature seasonality. This study deepens our understanding of the spatial variation in the temperature sensitivity of vegetation spring leafing phenology in the Northern Hemisphere.

Original languageEnglish
Article number108759
JournalAgricultural and Forest Meteorology
Volume313
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • Climate change
  • Greenup onset date
  • Temperature seasonality
  • Temperature sensitivity
  • Vegetation spring phenology

ASJC Scopus subject areas

  • Global and Planetary Change
  • Forestry
  • Agronomy and Crop Science
  • Atmospheric Science

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