The Fog Event Index, which included hybrid satellite PAR data, in-situ PAR data, and dew point depression value, can detect daytime fog event for ~87% accuracy in Chilan Mountain. Besides, the FEI can be applied to montane cloud forest elsewhere theoretically if in-situ PAR and dew point depression data are available. Among our four open-sky meteorological stations inside fog zone, we found that there were still considerable fog duration difference along the elevation (1151~1810 m a.s.l.). A more fog group was detected at mid-altitudes (1514 to 1670 m a.s.l.) in Chilan Mountain while outside this zone was viewed as less fog group. The maximum fog duration difference of two groups was up to 3.9 times. There were more fog in fall and winter, and the fog events mostly last for few hours. The long fog duration events occurred mainly at mid-altitudes.
The application of the FEI, such as quantifying fog duration and detecting seasonality, can help us understand rapidly shifting fog dynamics of a cloud forest. With long term fog dynamics detection, the fog belt shifting evidence will be clearer under climate change.
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