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Wenxin Zhang

Forskare

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Non-symmetric responses of leaf onset date to natural warming and cooling in northern ecosystems

Författare

  • Lei He
  • Jian Wang
  • Philippe Ciais
  • Ashley Ballantyne
  • Kailiang Yu
  • Wenxin Zhang
  • Jingfeng Xiao
  • François Ritter
  • Zhihua Liu
  • Xufeng Wang
  • Xiaojun Li
  • Shouzhang Peng
  • Changhui Ma
  • Chenghu Zhou
  • Zhao Liang Li
  • Yaowen Xie
  • Jian Sheng Ye
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Summary, in English

The northern hemisphere has experienced regional cooling, especially during the global warming hiatus (1998-2012) due to ocean energy redistribution. However, the lack of studies about the natural cooling effects hampers our understanding of vegetation responses to climate change. Using 15,125 ground phenological time series at 3,620 sites since the 1950s and 31-year satellite greenness observations (1982-2012) covering the warming hiatus period, we show a stronger response of leaf onset date (LOD) to natural cooling than to warming, i.e. the delay of LOD caused by 1°C cooling is larger than the advance of LOD with 1°C warming. This might be because cooling leads to larger chilling accumulation and heating requirements for leaf onset, but this non-symmetric LOD response is partially offset by warming-related drying. Moreover, spring greening magnitude, in terms of satellite-based greenness and productivity, is more sensitive to LOD changes in the warming area than in the cooling. These results highlight the importance of considering non-symmetric responses of spring greening to warming and cooling when predicting vegetation-climate feedbacks.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2023-09-01

Språk

Engelska

Publikation/Tidskrift/Serie

PNAS Nexus

Volym

2

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Climate Research

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2752-6542