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Changes in global vegetation distribution and carbon fluxes in response to global warming: simulated results from IAP-DGVM in CAS-ESM2


doi:  10.1007/s00376-021-1138-3

  • Terrestrial ecosystems are an important part of Earth systems, and they are undergoing remarkable changes in response to global warming. This study investigates the response of terrestrial vegetation distribution and carbon fluxes to global warming by using the new dynamic global vegetation model in the second version of the Chinese Academy of Sciences (CAS) Earth System Model (CAS-ESM2). We conducted two sets of simulations, the present-day simulation and the future simulation, which were forced by the present-day climate during 1981–2000 and the future climate during 2081–2100, respectively, derived from RCP8.5 outputs in CMIP5. The results show an overall increase in vegetation coverage in response to global warming, which is the net result of the greening in the mid-high latitudes and the browning in the tropics. The results also show an enhancement in carbon fluxes in response to global warming, including gross primary productivity, net primary productivity and autotrophic respiration. We found that the changes in vegetation coverage were significantly correlated with changes in surface air temperature, reflecting the dominant role of temperature, while the changes in carbon fluxes were caused by the combined effects of leaf area index, temperature, and precipitation. This study applies CAS-ESM2 to investigate the response of terrestrial ecosystems to climate warming, and this application is favorable to better understand vegetation processes and to further improve model parameterizations.
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Manuscript History

Manuscript received: 12 April 2021
Manuscript revised: 05 August 2021
Manuscript accepted: 14 September 2021
通讯作者: 陈斌, bchen63@163.com
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Changes in global vegetation distribution and carbon fluxes in response to global warming: simulated results from IAP-DGVM in CAS-ESM2

Abstract: Terrestrial ecosystems are an important part of Earth systems, and they are undergoing remarkable changes in response to global warming. This study investigates the response of terrestrial vegetation distribution and carbon fluxes to global warming by using the new dynamic global vegetation model in the second version of the Chinese Academy of Sciences (CAS) Earth System Model (CAS-ESM2). We conducted two sets of simulations, the present-day simulation and the future simulation, which were forced by the present-day climate during 1981–2000 and the future climate during 2081–2100, respectively, derived from RCP8.5 outputs in CMIP5. The results show an overall increase in vegetation coverage in response to global warming, which is the net result of the greening in the mid-high latitudes and the browning in the tropics. The results also show an enhancement in carbon fluxes in response to global warming, including gross primary productivity, net primary productivity and autotrophic respiration. We found that the changes in vegetation coverage were significantly correlated with changes in surface air temperature, reflecting the dominant role of temperature, while the changes in carbon fluxes were caused by the combined effects of leaf area index, temperature, and precipitation. This study applies CAS-ESM2 to investigate the response of terrestrial ecosystems to climate warming, and this application is favorable to better understand vegetation processes and to further improve model parameterizations.

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