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Petaluma Gap
The Petaluma Gap is a geographical region in Sonoma County, California which extends in a band from the Pacific Ocean to San 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 between Bodega Bay and Tomales Bay. The eastern edge of the gap is located at San Pablo Bay around the mouth of the Petaluma River. The city of Petaluma is near the center of the gap.
The Petaluma Gap affects wind patterns (and thus microclimates and air quality) in the San Francisco Bay Area. Fresh marine air generally blows eastward through the gap, branching into southward and northward streams which blow toward the Carquinez Strait and Santa Rosa respectively. The southward stream 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.
During the 1990s, the Sonoma County wine industry adopted the term ''Petaluma Gap'' to help differentiate its products. The gap is a part of the Sonoma Coast AVA, a designated American 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. Mornings in the region tend to be foggy, followed by sunny days and windy afternoons. The cool evening temperatures help to preserve the natural acidity of the grapes over an extended growing season. In 2006, twenty-four local organizations and individuals formed a promotional group called the Petaluma Gap Grape and Wine Alliance, now known as the Petaluma Gap Winegrowers Alliance.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Petaluma Gap」の詳細全文を読む
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