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A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map. Troughs may be at the surface, or aloft, at ...
Airflow around troughs and ridges in upper troposphere. Given the direction of the winds around an anticyclonic circulation and the fact that weather systems move from west to east: [2] ahead of an upper-ridge, the airflow that comes from the polar regions and brings cold air.
On its western side, the ridge is flanked by two back-arc basins, the Lau Basin and Havre Trough, that began opening at 6 Ma and 2 Ma respectively. Beyound the basins is the Lau-Colville Ridge. Together with these seafloor structures the ridge forms the eastward-migrating, 100 million year old Lau–Tonga–Havre–Kermadec arc/back-arc system ...
The multiple fault lines, ridges, and basins, including the Virgin Islands Basin, Anegada Gap, and Sombrero Basin, that form part of the general trough stretching from the southeastern Puerto Rican mainland in the Caribbean Sea to the northeastern British Virgin Island of Anegada in the North Atlantic Ocean are often collectively grouped under the name of Anegada Passage or Trough.
Bathymetric image of the Gorda Ridge – GeoMapApp The regional setting of the Gorda Ridge. The Gorda Ridge (or plural, Ridges) (centered 41° 36' N, 127° 22' W), is a tectonic spreading center, located roughly 200 kilometres (120 mi) off the northern coast of California and southern Oregon.
Shortwave troughs are a cause of lift, or forcing, which is required for the development of thunderstorms and convection.Convection is very prevalent around shortwave troughs because not only do they provide forcing, but they are also associated with systems that provide other ingredients for the formation of thunderstorms, such as instability, wind shear, and helicity.
A classic glacial trough is in Glacier National Park in Montana, USA in which the St. Mary River runs. Another well-known U-shaped valley is the Nant Ffrancon valley in Snowdonia , Wales . When a U-shaped valley extends into saltwater, becoming an inlet of the sea, it is called a fjord , from the Norwegian word for these features that are ...
The formation of these bending faults is suppressed where oceanic ridges or large seamounts are subducting into the trench, but the bending faults cut right across smaller seamounts. Where the subducting slab is only thinly veneered with sediments, the outer slope will often show seafloor spreading ridges oblique to the horst and graben ridges ...