On the role of the Planetary Boundary Layer in the numerical simulation of a severe cyclonic storm Nargis using a mesoscale model

2012 ◽  
Vol 63 (3) ◽  
pp. 1471-1496 ◽  
Author(s):  
S. S. V. S. Ramakrishna ◽  
N. Vijaya Saradhi ◽  
C. V. Srinivas
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Planetary Boundary Layer ◽  
Mesoscale Model ◽  
Cyclonic Storm ◽  
Severe Cyclonic Storm

Impact of Moisture Transport and Boundary Layer Processes on a Very Severe Cyclonic Storm Using the WRF Model

2019 ◽  
Vol 176 (12) ◽  
pp. 5445-5461 ◽  
Author(s):  
S. S. V. S. Ramakrishna ◽  
Nellipudi Nanaji Rao ◽  
B. Ravi Srinivasa Rao ◽  
P. Srinivasa Rao ◽  
C. V. Srinivas ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Moisture Transport ◽  
Wrf Model ◽  
Cyclonic Storm ◽  
Boundary Layer Processes ◽  
Severe Cyclonic Storm

scholarly journals An investigation of ozone and planetary boundary layer dynamics over the complex topography of Grenoble combining measurements and modeling

2003 ◽  
Vol 3 (1) ◽  
pp. 797-825 ◽  
Author(s):  
O. Couach ◽  
I Balin ◽  
R. Jiménez ◽  
P. Ristori ◽  
S. Perego ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Planetary Boundary Layer ◽  
Land Surface ◽  
Mesoscale Model ◽  
Ozone Production ◽  
Horizontal Wind ◽  
Maximum Height ◽  
Complex Topography ◽  
Atmospheric Measurements ◽  
Model Calculations

Abstract. This paper concerns an evaluation of ozone (O3) and planetary boundary layer (PBL) dynamics over the complex topography of the Grenoble region through a combination of measurements and mesoscale model (METPHOMOD) predictions for three days, during July 1999. The measurements of O3 and PBL structure were obtained with a Differential Absorption Lidar (DIAL) system, situated 20 km south of Grenoble at Vif (310 m a.s.l.). The combined lidar observations and model calculations are in good agreement with atmospheric measurements obtained with an instrumented aircraft (METAIR). Ozone fluxes were calculated using lidar measurements of ozone vertical profiles concentrations and the horizontal wind speeds measured with a Radar Doppler wind profiler (DEGREANE). The ozone flux patterns indicate that the diurnal cycle of ozone production is controlled by local thermal winds. The convective PBL maximum height was some 2700 m above the land surface while the nighttime residual ozone layer was generally found between 1200 and 2200 m. Finally we evaluate the magnitude of the ozone processes at different altitudes in order to estimate the photochemical ozone production due to the primary pollutants emissions of Grenoble city and the regional network of automobile traffic.

Sensitivity of MM5 and WRF mesoscale model predictions of surface winds in a typhoon to planetary boundary layer parameterizations

2009 ◽  
Vol 51 (1) ◽  
pp. 63-77 ◽  
Author(s):  
Ji Hye Kwun ◽  
You-Keun Kim ◽  
Jang-Won Seo ◽  
Ju Hee Jeong ◽  
Sung Hyup You
Keyword(s):  
Boundary Layer ◽  
Planetary Boundary Layer ◽  
Mesoscale Model ◽  
Surface Winds ◽  
Model Predictions

scholarly journals Observation of the Diurnal Cycle in the Low Troposphere of West Africa

2008 ◽  
Vol 136 (9) ◽  
pp. 3477-3500 ◽  
Author(s):  
Marie Lothon ◽  
Frédérique Saïd ◽  
Fabienne Lohou ◽  
Bernard Campistron
Keyword(s):  
Boundary Layer ◽  
Water Vapor ◽  
West Africa ◽  
Planetary Boundary Layer ◽  
Diurnal Cycle ◽  
Dry Season ◽  
Nocturnal Jet ◽  
The Impact ◽  
Made In

Abstract The authors give an overview of the diurnal cycle of the low troposphere during 2006 at two different sites, Niamey (Niger) and Nangatchori (Benin). This study is partly based on the first observations of UHF wind profilers ever made in West Africa in the context of the African Monsoon Multidisciplinary Analysis (AMMA) project. Also used are the radiosoundings made in Niamey and ground station observations at Nangatchori, which allow for the study of the impact of the dynamics on the water vapor cycle and the turbulence observed at the ground. Profiler measurements revealed a very consistent year-round nocturnal low-level jet maximal around 0500 UTC and centered at 400-m above the ground, with wind speed around 15 m s−1. This jet comes either from the northeast during the dry season or from the southwest during the wet season, in relation with the position of the intertropical discontinuity. The radiosoundings made in Niamey highlight both the role of the nocturnal jet in bringing water vapor from the south during the night when the intertropical discontinuity has reached the vicinity of the considered area at the end of the dry season and the role of the daytime planetary boundary layer in mixing this water vapor within a larger depth of the troposphere. The planetary boundary layer processes play a large role in the diurnal cycle of the position of the intertropical discontinuity itself. The observations of turbulence made at the ground in Nangatchori showed that the best signature of the nocturnal jet close to surface can be seen in the turbulent kinetic energy and skewness of the air vertical velocity, rather than on the mean wind itself. They reveal the downward transport of momentum from the jet core aloft to the surface.

scholarly journals Role of Patchy Snow Cover on the Planetary Boundary Layer Structure during Late Winter Observed in the Central Tibetan Plateau

2012 ◽  
Vol 90C (0) ◽  
pp. 145-155 ◽  
Author(s):  
Kenichi UENO ◽  
Shiori SUGIMOTO ◽  
Hiroyuki TSUTSUI ◽  
Kenji TANIGUCHI ◽  
Zeyong HU ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Tibetan Plateau ◽  
Snow Cover ◽  
Planetary Boundary Layer ◽  
Layer Structure ◽  
Late Winter ◽  
Boundary Layer Structure ◽  
Central Tibetan Plateau
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