Onset of spring starting earlier across the Northern Hemisphere

Abstract Recent warming of Northern Hemisphere (NH) land is well documented and typically greater in winter/spring than other seasons. Physical environment responses to warming have been reported, but not details of large‐area temperate growing season impacts, or consequences for ecosystems and agriculture. To date, hemispheric‐scale measurements of biospheric changes have been confined to remote sensing. However, these studies did not provide detailed data needed for many investigations. Here, we show that a suite of modeled and derived measures (produced from daily maximum–minimum temperatures) linking plant development (phenology) with its basic climatic drivers provide a reliable and spatially extensive…

• NS
  National Science Foundation
• AH
  American Heart Association
• ET
  Eesti Teadusfondi
• CA
  Chinese Academy of Sciences
• CA
  Chinese Academy of Meteorological Sciences