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. 2024 Jun 10;31(29):42034–42048. doi: 10.1007/s11356-024-33864-z

Fig. 4.

Fig. 4

The relationship between CH4 partial pressure and variation in δ13C-CO2 in seawater after various treatments with crude oil films for 4 days. The primary effects of solar radiation and secondary effects of temperature on the overall process are graphically shown. Yellow markers, 26 °C; red markers, 30 °C; black markers, dark incubations; blue markers, seawater controls; squares, reduced solar radiation, circles, full solar radiation