Molecular dissipation of turbulent fluctuations in the convective mixed layer part II: Height variations of characteristic time scales and experimental test of molecular dissipation models

1983 ◽  
Vol 27 (3) ◽  
pp. 257-279 ◽  
Author(s):  
H. Isaka ◽  
B. Guillemet
Keyword(s):  
Time Scales ◽  
Mixed Layer ◽  
Experimental Test ◽  
Characteristic Time ◽  
Turbulent Fluctuations ◽  
Convective Mixed Layer

scholarly journals Characteristics of Large-Scale Orographic Precipitation in a Linear Perspective

2011 ◽  
Vol 12 (1) ◽  
pp. 27-44 ◽  
Author(s):  
Michael Kunz
Keyword(s):  
Time Scales ◽  
Characteristic Time ◽  
Large Scale ◽  
Linear Perspective ◽  
Horizontal Wind ◽  
Small Scale ◽  
Orographic Precipitation ◽  
Observation Data ◽  
Horizontal Wind Speed ◽  
Precipitation Patterns

Abstract Simulations of orographic precipitation over the low mountain ranges of southwestern Germany and eastern France with two different physics-based linear precipitation models are presented. Both models are based on 3D airflow dynamics from linear theory and consider advection of condensed water and leeside drying. Sensitivity studies for idealized conditions and a real case study show that the amount and spatial distribution of orographic precipitation is strongly controlled by characteristic time scales for cloud and hydrometeor advection and background precipitation due to large-scale lifting. These parameters are estimated by adjusting the model results on a 2.5-km grid to observed precipitation patterns for a sample of 40 representative orography-dominated stratiform events (24 h) during a calibration period (1971–80). In general, the best results in terms of lowest rmse and bias are obtained for characteristic time scales of 1600 s and background precipitation of 0.4 mm h−1. Model simulations of a sample of 84 events during an application period (1981–2000) with fixed parameters demonstrate that both models are able to reproduce quantitatively precipitation patterns obtained from observations and reanalyses from a numerical model [Consortium for Small-scale Modeling (COSMO)]. Combining model results with observation data shows that heavy precipitations over mountains are restricted to situations with strong atmospheric forcings in terms of synoptic-scale lifting, horizontal wind speed, and moisture content.

An Observational Study of Wind Profiles in the Baroclinic Convective Mixed Layer

1999 ◽  
Vol 90 (1) ◽  
pp. 47-82 ◽  
Author(s):  
Margaret a. Lemone ◽  
Mingyu Zhou ◽  
Chin-Hoh Moeng ◽  
Donald H. Lenschow ◽  
L. Jay Miller ◽  
...  
Keyword(s):  
Observational Study ◽  
Mixed Layer ◽  
Convective Mixed Layer ◽  
Wind Profiles

scholarly journals Superconducting fluctuations and characteristic time scales in amorphous WSi

2018 ◽  
Vol 97 (17) ◽  
Author(s):  
Xiaofu Zhang ◽  
Adriana E. Lita ◽  
Mariia Sidorova ◽  
Varun B. Verma ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Time Scales ◽  
Characteristic Time ◽  
Superconducting Fluctuations

scholarly journals Properties of Phase Solitons in an Optically Driven Semiconductor Ring Laser

2019 ◽  
Vol 9 (20) ◽  
pp. 4351
Author(s):  
Ghafour Hashemvand Shakarab ◽  
Reza Kheradmand ◽  
Mohammad Agha Bolorizadeh ◽  
Franco Prati
Keyword(s):  
Time Scales ◽  
Propagation Velocity ◽  
Ring Laser ◽  
Characteristic Time ◽  
Carrier Lifetime ◽  
Large Range ◽  
Semiconductor Ring Laser

A semiconductor ring laser with a long cavity supports propagating localised structures with a chiral charge, named phase solitons. In this paper we study the dependence of the velocity and of the duration of the phase solitons on the characteristic time scales of the laser, namely the photon lifetime and the carrier lifetime. We show numerically that phase solitons are stable over a large range of those parameters and verify that the propagation velocity decreases linearly with the ratio of the carrier lifetime to the photon lifetime, while the duration is proportional to the ratio of the carrier lifetime to the cavity roundtrip time.

Characteristic time scales for the adsorption process for fibrinogen on silica

Langmuir ◽  
1992 ◽  
Vol 8 (2) ◽  
pp. 514-517 ◽  
Author(s):  
P. Schaaf ◽  
P. Dejardin ◽  
A. Johner ◽  
A. Schmitt
Keyword(s):  
Time Scales ◽  
Characteristic Time ◽  
Adsorption Process

Mixed Layer Heat Balance on Intraseasonal Time Scales in the Northwestern Tropical Atlantic Ocean*

2005 ◽  
Vol 18 (20) ◽  
pp. 4168-4184 ◽  
Author(s):  
Gregory R. Foltz ◽  
Michael J. McPhaden
Keyword(s):  
Time Scales ◽  
Mixed Layer ◽  
Heat Balance ◽  
Dominant Role ◽  
Surface Wind ◽  
Local Heat ◽  
Warm Pool ◽  
Surface Mixed Layer ◽  
Tropical Atlantic ◽  
Equatorial Atlantic

Abstract Recent observations have shown evidence of intraseasonal oscillations (with periods of approximately 1–2 months) in the northern and southern tropical Atlantic trade winds. In this paper, the oceanic response to the observed intraseasonal wind variability is addressed through an analysis of the surface mixed layer heat balance, focusing on three locations in the northwestern tropical Atlantic where in situ measurements from moored buoys are available (14.5°N, 51°W; 15°N, 38°W; and 18°N, 34°W). It is found that local heat storage at all three locations is balanced primarily by wind-induced latent heat loss, which is the same mechanism that is believed to play a dominant role on interannual and decadal time scales in the region. It is also found that the intraseasonal wind speed oscillations are linked to changes in surface wind convergence and convection over the western equatorial Atlantic warm pool. These atmospheric circulation anomalies and wind-induced SST anomalies potentially feed back on one another to affect longer time-scale variability in the region.

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