Title: Variations of solar-induced fluorescence, total primary productivity, and carbon dioxide over California wildfires

Authors: Ziyue Hu; Jinye Zhang; Xulong Wu; Chang Xu; Ruibei Liu; Hui Lv

Addresses: School of Science, Hubei University of Technology, National '111 Research Center' Microelectronics and Integrated Circuits, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, No. 28, Nanli Road Hongshan District Wuhan, China ' School of Science, Hubei University of Technology, National '111 Research Center' Microelectronics and Integrated Circuits, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, No. 28, Nanli Road Hongshan District Wuhan, China ' School of Science, Hubei University of Technology, National '111 Research Center' Microelectronics and Integrated Circuits, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, No. 28, Nanli Road Hongshan District Wuhan, China ' School of Science, Hubei University of Technology, National '111 Research Center' Microelectronics and Integrated Circuits, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, No. 28, Nanli Road Hongshan District Wuhan, China ' School of Software Engineering, Hubei Open University, 368 Minzu Avenue, Hongshan District, Wuhan, China ' School of Science, Hubei University of Technology, National '111 Research Center' Microelectronics and Integrated Circuits, Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, No. 28, Nanli Road Hongshan District, Wuhan, China

Abstract: Since 2015, the climate in California has become increasingly dry and wildfires have occurred frequently, causing great damage to the environment. To explore the environmental impact of wildfires in California, the Standardised Precipitation Evapotranspiration Index (SPEI) of the Global Drought Monitor was used in this study to identify drought events and characterise their degree of drought. The effects of drought on vegetation growth were studied using total primary productivity (GPP) and solar-induced chlorophyll fluorescence (SIF). Carbon dioxide (CO₂) retrieved by the Orbiting Carbon Observatory-2(OCO-2) satellite was also used to study the effects of forest fires on the atmosphere. SIF and GPP showed a trend of fluctuation and decrease, while CO₂ showed a trend of steady increase. These results show that wildfires have greatly damaged California's air quality and ecological environment.

Keywords: wildfire; SPEI; global warming; solar-induced chlorophyll fluorescence; SIF; California; CO₂; GPP; dry; OCO-2; seasonal variation.

DOI: 10.1504/IJGW.2024.136516

International Journal of Global Warming, 2024 Vol.32 No.3, pp.282 - 295

Received: 26 Apr 2023
Accepted: 25 Jul 2023
Published online: 05 Feb 2024 *

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