scholarly journals High initial-time sensitivity of medium-range forecasting observed for a stratospheric sudden warming

2010 ◽  
Vol 37 (16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yuhji Kuroda
Keyword(s):  
Initial Time ◽  
Stratospheric Sudden Warming ◽  
Time Sensitivity ◽  
Medium Range

scholarly journals Global characteristics of the westward-propagating quasi-16-day wave with zonal wavenumber 1 and the connection with the 2012/2013 SSW revealed by ERA-Interim

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Wei Li ◽  
Chunming Huang ◽  
Shaodong Zhang
Keyword(s):  
Baroclinic Instability ◽  
Polar Vortex ◽  
Meridional Wind ◽  
Local Source ◽  
High Latitudes ◽  
Stratospheric Sudden Warming ◽  
Weather Forecasts ◽  
Zonal Wavenumber ◽  
Medium Range ◽  
One Year

AbstractWe analyze global characteristics of the westward-propagating quasi-16-day wave (Q16DW) with zonal wavenumber 1 (W1) in the troposphere and stratosphere using zonal wind, meridional wind, vertical velocity, temperature, geopotential, and potential vorticity data from the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Re-Analysis during one year from December 2012 to November 2013. The amplitudes of the W1 Q16DW are larger in the stratosphere than in the troposphere, and remarkable amplitudes are found at middle and high latitudes in the Northern Hemisphere (NH). More detailed analyses on the temporal variation in the W1 Q16DW show that this wave is significantly enhanced during the 2012/2013 Stratospheric Sudden Warming (SSW) event, and the strong wave most likely provides additional forcing on the splitting of the displaced polar vortex. Analysis of the Eliassen–Palm flux (EP flux) and its divergence of the interaction between W1 Q16DW and quasi-stationary planetary waves with wavenumber 1 during the 2012/2013 SSW event reveals that it causes an upward heat flux and exerts a westward acceleration on the background winds, indicating that this interaction plays an important role in the eastward stratospheric jet reversal. Moreover, the wave is amplified in the occurrence region of barotropic and/or baroclinic instability, suggesting a local source of the growing W1 Q16DW during this SSW event.

About definition of the local entropy rate of production in experiment of pulse electric heating

2020 ◽  
pp. 29-34
Author(s):  
Alexandr V. Kostanovskiy ◽  
Margarita E. Kostanovskaya
Keyword(s):  
Thermal Diffusivity ◽  
Electric Heating ◽  
Thermal Capacity ◽  
Entropy Rate ◽  
Initial Time ◽  
Local Entropy ◽  
Linear Mode ◽  
Electric Capacity ◽  
Definition Of ◽  
Pulse Electric

Work is devoted to studying of a linear mode thermodynamic – a mode which is actively investigated now. One of the main concepts of a linear mode – local entropy rate of production. The purpose of given article consists in expansion of a circle of problems for which it is possible to calculate a local entropy rate of production, namely its definition, using the experimental “time-temperature” curves of heating/cooling. “Time-temperature” curves heating or cooling are widely used in non-stationary thermophysical experiments at studying properties of substances and materials: phase transitions of the first and second sort, a thermal capacity, thermal diffusivity. The quantitative substantiation of the formula for calculation of the local entropy rate of production in which it is used thermogram (change of temperature from time) which is received by a method of pulse electric heating is resulted. Initial time dependences of electric capacity and temperature are measured on the sample of niobium in a microsecond range simultaneously. Conformity of two dependences of the local entropy rate of production from time is shown: one is calculated under the known formula in which the brought electric capacity is used; another is calculated, using the thermogram.

Medium-range Orders in Amorphous Alloys and Their Role on the Plasticity: A Molecular Dynamics Viewpoint Study

2010 ◽  
Vol 48 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Chang-Myeon Lee ◽  
Mirim Lee ◽  
Kwang-Ryeol Lee ◽  
Kyung-Han Kang ◽  
Byeong-Joo Lee ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Amorphous Alloys ◽  
Medium Range

Driver Knowledge and Beliefs About Antilock Brake Systems: Have Preconditions for Behavioral Adaptation Been Met?

2001 ◽  
Vol 1779 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Martin Lee-Gosselin ◽  
Pierre-Sébastien Fournier ◽  
Isabelle Béchard
Keyword(s):  
Behavioral Adaptation ◽  
Standard Equipment ◽  
Telephone Interviews ◽  
Advantages And Disadvantages ◽  
Knowledge And Beliefs ◽  
Behavioral Adaptations ◽  
Open Questions ◽  
Medium Range ◽  
Level Of Knowledge ◽  
Light Duty Vehicles

Some studies suggest that the benefits of antilock brake systems (ABS) may be offset through behavioral adaptation, such as driving faster or following closer. Whether preconditions for behavioral adaptation exist was examined by investigating driver knowledge and beliefs about ABS. Telephone interviews were conducted throughout Quebec early in 1999 with principal drivers of a stratified random sample of 404 drivers with currently registered light-duty vehicles, registered to the same person for at least 18 months. The response rate was 82 percent of 492 reached. Only medium-range and high-end 1990-1995 vehicles, for which ABS was either standard equipment or unavailable, were selected. The protocol involved mostly open questions that encouraged respondents to reveal their knowledge and beliefs with minimal prompting. The results indicated an important lack of understanding, on the part of a majority of drivers, regarding the functioning and use of ABS. This varied from an inability to identify conditions in which ABS is favorable or unfavorable to serious misconceptions; about 25 percent were wrong about whether their vehicle was ABS equipped. Cognitive preconditions for behavioral adaptations—sometimes increased prudence—were found for a minority of this sample, and there may be a relationship between a low level of knowledge and the perceived possibility of driving faster with these brakes. There appears to be a case for improved public and dealer-delivered information on the advantages and disadvantages of ABS in different driving conditions, which if balanced should not increase unsafe behavioral adaptation.

Medium Range Atmospheric Forecast System: Evaluation Plan.

1985 ◽  
Author(s):  
P. A. Petit ◽  
H. D. Hamilton ◽  
R. L. Elsberry
Keyword(s):  
System Evaluation ◽  
Forecast System ◽  
Evaluation Plan ◽  
Medium Range
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