Trees in many coastal forests increase water yield by condensing water from fog onto needles, a process known as "fog drip."

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References

“Fog and rain were collected for stable isotopic analysis for nearly 4 years at three locations on the Point Reyes Peninsula in California. In addition, in 1990, soil water and tree water were collected at the end of the rainy season, and again at the end of the foggy season to determine the importance of fog-drip water to arboreal vegetation…The isotopic composition of the tree core water indicates varying degrees of fog water use by the arboreal vegetation. At the most coastal location, the vegetation appears to use fog-drip water year-round. At another location, the use is seasonal, occurring at least during the end of the summer foggy season. At the third location the vegetation appears to use solely ground water, which may or may not contain fog water.” (Ingraham and Matthews 1995:269)

Journal article
The importance of fog-drip water to vegetation: Point Reyes Peninsula, CaliforniaJournal of Hydrology, 164(1–4): 269-285January 1, 1995
Ingraham NL, Matthews RA

Journal article
Fog drip in the Bull Run Municipal Watershed, OregonWater Resources Bulletin, Journal of the American Water Resources Association, 18(5): 785-789October 1, 1982
Harr DR

Newspaper article
Clues To Redwoods' Mighty Growth Emerge in FogNew York TimesNovember 24, 1998
Yoon CK

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Organism
Coast RedwoodSequoia sempervirensSpecies


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