- Petaluma Gap
The Petaluma Gap is a geographical region in
Sonoma County, California which extends in a band from thePacific Ocean toSan Pablo Bay . It is an area of low land 22 to 31 miles (35 to 50 kilometers wide) in the coast ranges of the northern San Francisco Bay Area. The western edge of the gap is located in the coastal lowlands betweenBodega Bay andTomales Bay . The eastern edge of the gap is located at San Pablo Bay around the mouth of thePetaluma River . The city of Petaluma is near the center of the gap.The Petaluma Gap affects wind patterns (and thus
microclimate s and air quality) in theSan Francisco Bay Area . Fresh marine air generally blows eastward through the gap, branching into southward and northward streams which blow toward theCarquinez Strait and Santa Rosa respectively. The southward streem brings marine air overland into the central Bay Area from the northwest. Warm air rises from the land and allows cold, moist air, plus winds and fog to move into the area.cite web
url=http://www.baaqmd.gov/dst/papers/bay_area_climate.pdf|title=Bay Area Climate
accessdate=2008-01-05]During the 1990s, the
Sonoma County wine industry adopted the term "Petaluma Gap" to help differentiate its products. The gap is a part of theSonoma Coast AVA , a designatedAmerican Viticultural Area , but is not itself an AVA. Wine grapes growing in the Petaluma Gap are said to be influenced enough by this climate to give the area's wines a distinctive character. The wind-driven cool moisture reduces heat stress on grapevines, allowing the production of wines that require exacting temperatures and humidities for proper fruiting. In 2006, twenty-four local organizations and individuals formed a promotional group called the Petaluma Gap Grape and Wine Alliance. [cite web
url=http://www.arguscourier.com/news/news/wine060426.html
title=Local wine industry forms alliance
accessdate=2008-01-05
date=April 26, 2006
publisher=Petaluma Argus Courier]References
* [http://cesonoma.ucdavis.edu/hortic/sonoma_county_climate.pdf Sonoma County Climatic Zones]
* [http://www.earthscape.org/r2/mwr/v134i7/f.html A Multiwinter Analysis of Channeled Flow through a Prominent Gap along the Northern California Coast during CALJET and PACJET (abstract)]
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