Modelling incoming radiation on a linear disturbance and its impact on the ground thermal regime in discontinuous permafrost

2013 ◽  
Vol 27 (13) ◽  
pp. 1854-1865 ◽  
Author(s):  
T. J. Williams ◽  
W. L. Quinton
Keyword(s):  
Thermal Regime ◽  
Incoming Radiation ◽  
Discontinuous Permafrost ◽  
Linear Disturbance

scholarly journals Active layer thermal regime in two climatically contrasted sites of the Antarctic Peninsula region

2016 ◽  
Vol 42 (2) ◽  
pp. 457 ◽  
Author(s):  
F. Hrbáček ◽  
M. Oliva ◽  
K. Laska ◽  
J. Ruiz-Fernández ◽  
M. A. De Pablo ◽  
...  
Keyword(s):  
Active Layer ◽  
Antarctic Peninsula ◽  
Thermal Regime ◽  
Active Layer Thickness ◽  
Mean Annual Temperature ◽  
Climate Trends ◽  
Ground Temperatures ◽  
Air Temperatures ◽  
Discontinuous Permafrost ◽  
The Antarctic

Permafrost controls geomorphic processes in ice-free areas of the Antarctic Peninsula (AP) region. Future climate trends will promote significant changes of the active layer regime and permafrost distribution, and therefore a better characterization of present-day state is needed. With this purpose, this research focuses on Ulu Peninsula (James Ross Island) and Byers Peninsula (Livingston Island), located in the area of continuous and discontinuous permafrost in the eastern and western sides of the AP, respectively. Air and ground temperatures in as low as 80 cm below surface of the ground were monitored between January and December 2014. There is a high correlation between air temperatures on both sites (r=0.74). The mean annual temperature in Ulu Peninsula was -7.9 ºC, while in Byers Peninsula was -2.6 ºC. The lower air temperatures in Ulu Peninsula are also reflected in ground temperatures, which were between 4.9 (5 cm) and 5.9 ºC (75/80 cm) lower. The maximum active layer thickness observed during the study period was 52 cm in Ulu Peninsula and 85 cm in Byers Peninsula. Besides climate, soil characteristics, topography and snow cover are the main factors controlling the ground thermal regime in both areas.

The thermal regime of intertidal permafrost, George River estuary, Ungava Bay, Quebec

1992 ◽  
Vol 29 (2) ◽  
pp. 249-259 ◽  
Author(s):  
Michel Allard ◽  
Richard Fortier ◽  
Maurice K. Seguin
Keyword(s):  
Thermal Regime ◽  
Freezing Point ◽  
River Estuary ◽  
Storm Surges ◽  
Intertidal Sediments ◽  
Climatic Variations ◽  
Discontinuous Permafrost ◽  
Water Percolation ◽  
George River ◽  
Drill Holes

Permafrost in tidal-marsh sediments was studied along the estuary of George River, Ungava Bay, northern Quebec. In this macrotidal environment, wide tidal flats and marshes lie in bays along the shoreline. Discontinuous permafrost bodies occur in the silty sediments underlying the marshes in the upper part of the intertidal zone, where submersions by large tides and storm surges are rare and where the icefoot freezes to the ground in winter. The permafrost is about 5 m thick, saline, and ice poor. According to logged thermal data, a freezing-point depression of 0.9 °C is estimated for the intertidal sediments. Tidal submersions during the ice-free season have a transient warming effect on the soil profile due to water percolation in the active layer and delay freeze back at the beginning of winter. Observations in shallow drill holes and along a thermistor cable indicate that the intertidal permafrost degraded at the Kangiqsualujjuaq observation site from 1984 to 1987. From 1987 to 1990, observations and logged data clearly show aggradation and cooling of the permafrost. Those changes in ground thermal regime are the result of recent climatic variations.

MONITORING OF THE THERMOABRASIONAL AND ACCUMULATIVE COASTS NEAR THE UNDERWATER GAS PIPELINE ROUTE ACROSS THE BAYDARATSKAYA BAY, KARA SEA

2017 ◽  
Author(s):  
Nataliya Belova ◽  
Nataliya Belova ◽  
Alisa Baranskaya ◽  
Alisa Baranskaya ◽  
Osip Kokin ◽  
...  
Keyword(s):  
Thermal Regime ◽  
Storm Surges ◽  
Gas Pipeline ◽  
The Arctic ◽  
Yamal Peninsula ◽  
Permafrost Degradation ◽  
Nearshore Zone ◽  
Barrier Beach ◽  
Energy Dissipater ◽  
Pipeline Route

The coasts of Baydaratskaya Bay are composed by loose frozen sediments. At Yamal Peninsula accumulative coasts are predominant at the site where pipeline crosses the coast, while thermoabrasional coast are prevail at the Ural coast crossing site. Coastal dynamics monitoring on both sites is conducted using field and remote methods starting from the end of 1980s. As a result of construction in the coastal zone the relief morphology was disturbed, both lithodynamics and thermal regime of the permafrost within the areas of several km around the sites where gas pipeline crosses coastline was changed. At Yamal coast massive removal of deposits from the beach and tideflat took place. The morphology of barrier beach, which previously was a natural wave energy dissipater, was disturbed. This promoted inland penetration of storm surges and permafrost degradation under the barrier beach. At Ural coast the topsoil was disrupted by construction trucks, which affected thermal regime of the upper part of permafrost and lead to active layer deepening. Thermoerosion and thermoabrasion processes have activated on coasts, especially at areas with icy sediments, ice wedges and massive ice beds. Construction of cofferdams resulted in overlapping of sediments transit on both coasts and caused sediment deficit on nearby nearshore zone areas. The result of technogenic disturbances was widespread coastal erosion activation, which catastrophic scale is facilitated by climate warming in the Arctic.

AUTONOMOUS HEAT SUPPORT SYSTEM OF ELECTRONIC BLOCKS OF SPACE APPLIANCES

2018 ◽  
pp. 72-78
Author(s):  
A. V. Gorbunov ◽  
Yu. A. Zhukov ◽  
E. V. Korotkov ◽  
A. V. Lekanov ◽  
V. G. Porpylev ◽  
...  
Keyword(s):  
Thermal Regime ◽  
Autonomous System ◽  
Supply Voltage ◽  
Operating Temperature ◽  
Electronic Devices ◽  
Space Technology ◽  
Structural Scheme ◽  
Spacecraft Design ◽  
Temperature Controlled ◽  
Operating Temperature Range

The vast majority of electronic devices on-Board Russian spacecraft is placed on a temperature-controlled mounting surface is ON, however, in some tasks there is a necessity to place a separate electronic units out thermostated panels on remote spacecraft design. The article presents an autonomous system of providing thermal regime of electronic blocks of spacecraft and objects of space technology that require maintaining the operating temperature and are unable to be installed on the thermostatic landing surfaces of spacecraft. The proposed autonomous system of providing thermal regime can operate autonomously in the extended operating temperature range of the installation surface from -80 to +80 °C when the supply voltage changes in the range from 75 to 550% of the nominal value. The review of the existing solutions is presented, the substantiation of the proposed decision is given, the structural scheme of autonomous system of providing thermal regime is given and its description and an example of application is given.

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