diffuse radiation worldwide for the following 2 years. We estimated that this increase in diffuse radiation alone enhanced noontime photosynthesis of a deciduous forest by 23 % in 1992 and 8 % in 1993 under cloudless conditions. This finding indicates that the aerosol-induced increase in diffuse radiation by the volcano enhanced the terrestrial carbon sink and contributed to the temporary decline in the growth rate of atmospheric carbon dioxide after the eruption. The growth rate of atmospheric CO2 concentration experienced a sharp decline in the early 1990s, an observation that was unprecedented since CO2 monitoring began in the late 1950s (1, 2). This perturbation is of great interest to the global carbon cycle community because it coincided with the eruption of Mount Pinatubo (15.1°N, 121.4°E) on 1
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