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Hongxiao Jin

Hongxiao Jin

Researcher

Hongxiao Jin

Seasonal divergence in the sensitivity of carbon and water fluxes to climate variability in terrestrial ecosystems

Author

  • Wang Ting
  • Zheng Fu
  • David Makowski
  • Guopeng Liang
  • Hongxiao Jin
  • Fangyue Zhang

Summary, in English

Understanding vegetation sensitivity to hydroclimate factors, especially how carbon and water cycles respond to climate change, is crucial for assessing ecosystem vulnerability. However, the seasonal sensitivity of carbon and water fluxes to temperature, radiation, soil water content, and vapor pressure deficit across diverse biomes and climates remains unclear. Here, we use 196 eddy covariance observations from sensor networks distributed globally, along with daily estimates from Earth System Models (ESMs), to quantify the seasonal sensitivity of daily gross primary productivity (GPP), ecosystem respiration (RE), net ecosystem productivity (NEP), and evapotranspiration (ET) to various hydroclimate factors. Our ridge regression analysis reveals seasonal variations in the sensitivity of carbon and water fluxes to hydroclimate factors across globally distributed flux sites. GPP and NEP are most sensitive to air temperature (TA) in spring, but to radiation (RAD) in summer, autumn and winter. RE consistently exhibits positive sensitivity to TA across all seasons, while ET shows the highest sensitivity to RAD throughout the year. Although energy-related factors like TA and RAD dominate the influence on carbon and water fluxes at sub-seasonal scales, soil water content (SWC) and vapor pressure deficit (VPD) become increasingly important during summer, particularly in drylands. At sites with long-term measurements, we identified a significant upward trend in the sensitivity of summer GPP to SWC with 0.005 ± 0.002 per year, suggesting that terrestrial ecosystems are becoming more constrained by water stress during summer. Compared to observations, ESMs generally overestimate the sensitivity of GPP to SWC and VPD, while underestimate the sensitivity to RAD and TA during summer. Our findings enhanced the understanding of the seasonal response of ecosystem carbon and water cycles to hydroclimate factors, offering insights into ecosystem function under future climate change.

Department/s

  • Dept of Physical Geography and Ecosystem Science
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publishing year

2025-11-01

Language

English

Publication/Series

Agricultural and Forest Meteorology

Volume

376

Document type

Journal article

Publisher

Elsevier

Topic

  • Physical Geography
  • Climate Science

Keywords

  • Carbon and water fluxesEddy covarianceHydroclimate factorsSeasonal variationsSensitivity

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-2240