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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 ...
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.
Within the trough is a slowly spreading north–south ridge which may be the result of an offset or gap of approximately 420 kilometres (260 mi) along the main fault trace. The Cayman spreading ridge shows a long-term opening rate of 11–12 mm/yr. [ 4 ] The eastern section of the trough has been named the Gonâve Microplate .
The Osbourn Trough, is a 900 km (560 mi)-long [1] extinct mid-ocean ridge, that may have stopped spreading as recently as 79 million years ago. [2] It is a west-to-east oriented sea floor feature, located to the east of the present Tonga-Kermadec Ridge where the present Pacific Plate is under going subduction under a micro-plate of the Australian Plate.
The Trough, photographed on July 3, 2016. The Trough is a 6-mile long wooded gorge carved by the South Branch Potomac River (SBPR) and situated in the Allegheny Mountains of Hampshire and Hardy Counties, West Virginia, US. The area was the site of a 1756 skirmish of the French and Indian War, known as the "Battle of the Trough".
The Ridiculously Resilient Ridge, here depicted by cool-season seasonal geopotential height anomalies (November–March) during 2012–2015. Adapted from [1]. The "Ridiculously Resilient Ridge", sometimes shortened to "Triple R" or "RRR", is the nickname given to a persistent anticyclone that occurred over the far northeastern Pacific Ocean, contributing to the 2011–2017 California drought.