Mesoscale analysis of a polartrough interacting with a polar front
The interaction of a polartrough with a polar front can lead to a characteristic satellite cloud pattern commonly referred to as an instant occlusion. The AA. refer to it under the name of pseudo-occlusion. A conceptual model of the pseudo
-occlusion is developed in which the key elements are (1) a moist, relatively warm, low-level jet associated with the polartrough, and (2) a major upper-level jet streak associated with the polar front. The polartrough conveyor belt and the polar front
Les dépressions peu creusées qui se développent rapidement à la faveur d'expulsions froides aux latitudes élevées du continent nord-américain (exemple des 25-28 janvier 1977) présentent de nombreux points communs avec les polar lows ou polartroughs
A case study of a subsynoptic disturbance in a polar outbreak
A subsynoptic disturbance, occurring in an outbreak of polar air over northwestern Europe, is studied by using routine observational data. The disturbance showed a characteristic length scale of about 150km, a time scale of 4hours, caused a surface
, which activated a weak trough filled with potentially unstable air. (JPB).
Geomorphologic characteristics and origin of the valley bottom troughs at the site of three Gorges Dam
This paper describes valley bottom troughs of the Changiang River and infers the geomorphology development of troughs. The deep troughs are formed by river downcutting along the structural zones on the background of regional tectonic uplift. Trough
deepening is due to jet currents with pebbles. The trend of the troughs is controlled is controlled by lenghtways fissure structures.
The remarkable development of tectonic land forms the Nankai and Suruga Troughs indicates that horizontal compressive interactions between the northern part of the Philippine Sea Plate and Southwest Japan have been active and accumulative
as tectonic deformations of the continental margin through the Quaternary up to the present. The continental slope facing the Nankai and Suruga Troughs is highly deformed and more active than the oceanic trench itself.
Submarine landforms preserved in bathymetric troughs on the Antarctic continental shelf show that the style of ice stream retreat across the shelf following the last glacial maximum varied between different troughs. Three styles of retreat
of local controls in the form of bathymetry and drainage basin size. These data provide important constraints for numerical models that attempt to predict the dynamics of large polar ice sheets.
Outlet glacier trough size-drainage area relationships, Fiordland, New Zealand
This paper reports on an investigation into aspects of the Fiordland block morphogenesis, specifically the relationship between fiord trough size and the area of the catchment supplying the ice to the outlet glacier trough.
Climatic variation ; Cold area ; Ice wedge ; Model ; Numerical model ; Palaeo-environment ; Periglacial features ; Polar region
criticisms focus on : the implications of trough evolution for cracking behaviour; the extent to which epigenetic, low-centred polygons represent the population of ice-wedge networks; and the modelled initiation of polygons in drained thaw lakes.
A 2D model for characterising first-order variability in sublimation of buried glacier ice, Antarctica : assessing the influence of polygon troughs, desert pavements and shallow subsurface salts
Antarctica ; Cold area ; Glacier ; Ice ; Ice wedges ; Microclimate ; Model ; Numerical model ; Patterned ground ; Periglacial features ; Permafrost ; Polar region ; Sublimation ; Temperature
Antártica ; Helero ; Hendidura de hielo ; Hielo ; Microclima ; Modelo ; Modelo numérico ; Pergelisol ; Periglaciar ; Región polar ; Suelo figurado ; Temperatura ; Zona fría
By using heretofore unpublished bathymetry and geophysical data, the trend of the Chinook Trough megatrend has been determined from the Juan de Fuca Ridge in the Gulf of Alaska to the Izu-Bonin trench. This study will present the bathymetry
Piston cores and single-channel seismic reflection data were collected during the Deep Freeze 85 and 86 expeditions to determine the late Quaternary history of the area. Seismic data in the bay show a rugged seafloor, with numerous deep troughs
prominent feature of the wind field. The areas of organized precipitation are well related to synoptic systems seen in the 850 mb flow (the quasi-stationary Burma-India through, the disturbances forming on the through, the confluence zone along the polar
(baiu) front, and the tranverse trough extending eastward from the Plateau). (JPB).
Regional-scale troughing over the southwestern United States: temporal climatology, teleconnections, and climatic impact
This study provides a detailed climatology of southwestern troughing that focuses on: the temporal frequency of these events; the teleconnective circulation changes that are associated with their development; and the importance of these systems
The excavation of the Storglaciären trough during the Quaternary
The results from several years of monitoring the suspended-sediment transport in the proglacial Tarfalajåkk Creek are used to calculate the time necessary for the creation of the Storglaciären glacial trough in the Kennekaise massif, northern Sweden.
Proximal troughs and ice movements in Gotland, southern Sweden
La dépression proximale (proximal trough), une forme d'origine glaciaire ignorée jusqu'à ce jour, est présentée comme un élément déterminant dans l'étude des mouvements de la glace. Analyses de stries, formes orientées, texture, pétrographie des
The geomorphology of valley-floor troughs illustrated from depositional sequences in the Durance valley, south-east France
with a consideration of the types, origins, and significance of valley-floor troughs. The landform of the Durance trough are then discussed, followed by an outline of methods employed in this study. The discussion considers the results, elaborates on the various