Similarity in Fog and Rainfall Intermittency

Intermittent fog occurrences supply significant amounts of moisture to plants in the form of fog drip onto the soil surface thereby prompting interest in their statistical behavior at multiple timescales. A comparison of rainfall and fog measurements collected at an inland tropical cloud forest in Kenya and a coastal rangeland in Northern California is presented to explore whether fog occurrences have similar intermittency characteristics as rainfall. The results confirm that both rainfall and fog show approximate power law relations for distributions of dry period and event size consistent with predictions from self-organized criticality. Moreover, the spectral exponents of the on-off time series of the fog and rainfall exhibited an approximate f−0.8 over a broad range of frequencies f, which is remarkably close to scaling exponents across sites experiencing different rainfall generation mechanisms. These results suggest that fog intermittency shares some properties of critical behavior documented in numerous rainfall studies.

Chung, M.University of California, Berkeley (författare)
Katurji, M.Canterbury University (författare)
Pellikka, P.University of Helsinki (författare)
Rinne, J.Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)ja4127ri (författare)
Katul, G. G.Duke University (författare)
University of HelsinkiUniversity of California, Berkeley (creator_code:org_t)

Av författaren/redakt...: Räsänen, M.; Chung, M.; Katurji, M.; Pellikka, P.; Rinne, J.; Katul, G. G.

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