Fig. 4: Plots of cave-air CO₂ concentrations. | npj Heritage Science

Fig. 4: Plots of cave-air CO₂ concentrations.

From: Dynamic patterns and resilience of cave-air CO₂ under tourism interferences in the Lushan National Geopark, north China

Fig. 4

Site 1 CO₂, Site 2 CO₂, Site 3 CO₂, and Site 4 CO₂ and soil CO₂ concentrations from March 2023 to January 2025 (dashed ellipses indicate peak periods of tourism activity in May and October), and the number of tourists in 2024 is also included (the red arrows represent the lagged input of soil CO2 into the cave, and the yellow dashed lines divide different seasons).

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