Structures of the Monsoon Low–Level Flow and the Monsoon Boundary Layer over the East Central Arabian Sea

Meyer, W. D.; Rao, Gandikota V.

doi:10.1175/1520-0469(1985)042<1929:sotmlf>2.0.co;2

Cited by 11 publications

(8 citation statements)

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“…Any individual value falling within 93 standard deviations from the mean is retained and the rest is replaced by mean 93 standard deviations. The quality check was performed earlier by VISWANADHAM et al (1997) following MEYER and RAO (1985). The same procedures are adopted for the present data sets.…”

Section: Experiment Data and Quality Checkmentioning

confidence: 99%

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Some Atmospheric Surface Layer Characteristics over Varanasi from MONTBLEX-90

Viswanadham

Satyanarayana²

1999

Pure and Applied Geophysics

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An attempt has been made to study the atmospheric surface layer characteristics such as Richardson number (Ri). Monin-Obukhov length scale (L), friction velocity (U * ), friction temperature (q * ), roughness length (Z 0 ), turbulent kinetic energy (TKE), ratio of eddy conductivity to eddy diffusivity (K m /K h ) over a semi-moist convective regime. Data which were collected at Varanasi (25°18%N, 83°E) as part of the experiment known as MONTBLEX-90 (Monsoon Trough Boundary Layer Experiment) during the summer monsoon season was used in the present study. The variation of the above parameters with stability has been discussed. The differences within the surface layer are also pointed out. Some broad features are found to coincide with that of BUSINGER et al. (1971). The heterogeneity and the anisotropic turbulence typical of monsoon tropical atmosphere are shown to be responsible for the deviations noticed within the surface layer.

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Section: Experiment Data and Quality Checkmentioning

confidence: 99%

“…Strong convection in the tropics can lead to a smaller ratio than 0.74. MEYER and RAO (1985) obtained values of K m and K h at heights from 140 m to approximately 330 m over the marine monsoon environment. The K m /K h values were more than 3.…”

Section: Figurementioning

confidence: 99%

Some Atmospheric Surface Layer Characteristics over Varanasi from MONTBLEX-90

Viswanadham

Satyanarayana²

1999

Pure and Applied Geophysics

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“…The general data quality requirements, instrumental response times, etc., of the aircraft are described in Kuettner et al (1979). The quality checks and selection procedures are given specifically in Meyer (1982) and Meyer and Rao (1985). Briefly, the turbulence data on level runs were selected for further processing if there were no excessive spikes in the time series of u, v, w, T, and pv or unnaturally large energy in the high frequency domain of their power spectra.…”

Section: Generalmentioning

confidence: 99%

“…Briefly, the turbulence data on level runs were selected for further processing if there were no excessive spikes in the time series of u, v, w, T, and pv or unnaturally large energy in the high frequency domain of their power spectra. The analyses techniques of the present study are similar to those of Lenschow and Stephens (1980) and Meyer and Rao (1985). These consist of removing linear trends, discarding the mean values, suppressing extreme values (greater than 2 x standard deviation) and applying a Lanczos filter to remove wavelengths greater than 4 km.…”

Section: Generalmentioning

confidence: 99%

Features of thermals in stable wake and neutral stratifications in the disturbed monsoon boundary layer

Roadcap

Rao

1986

Boundary-Layer Meteorol

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Thermals, detined as humidity excesses, seem to exhibit distinct features in the disturbed Indian Monsoon Boundary Layer (BL) depending on whether they occur in the stable wake regions, called S in this study, oftropical squalls, or in the neutral regions of the advancing squalls, called N. The stable S region developed weak but gradually increasing ascending motion in the BL while the N region showed strong upward motion at the top of the surface layer (85 m) decreasing steadily thereafter. Similar differences also appear in the other mean thermal fields such as temperature and humidity.The present study agrees with that of Lenschow and Stephens in that there is an increase of thermal cover (area covered by thermals) with height. Our study points out additionally that this happens only within the stable wake region. In the neutral region, the thermal cover is fairly constant.It appears that thermal parameters such as vertical velocity are good indicators of the atmospheric BL structure.

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“…Synoptic and mesoscale disturbances leading to low level convergence and vertical motions of humid air help the formation of stratiform/cumulus clouds. The monsoon cloud conditions strongly in¯uence the stability characteristics and turbulent exchange processes of the monsoon boundary layer (MEYER and RAO, 1985).…”

Section: Introductionmentioning

confidence: 99%

Observation of Double-mixing Line Structure in the Convective Boundary Layer During the Summer Monsoon Season

Murthy¹,

Parasnis²

2002

Pure and Applied Geophysics

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Ð The special aerological observations carried out as a part of Land Surface Processes Experiment (LASPEX) were used to investigate the thermodynamic structure of the convective boundary layer during the summer monsoon of 1997. The analysis suggested that the convective boundary layer top was found at 700 hPa which was associated with h e minimum and h es maximum values. Double-mixing line structure was noticed in the conserved variable diagrams which was possibly attributed to the radiative warming/evaporation of falling precipitation.

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Structures of the Monsoon Low–Level Flow and the Monsoon Boundary Layer over the East Central Arabian Sea

Cited by 11 publications

References 0 publications

Some Atmospheric Surface Layer Characteristics over Varanasi from MONTBLEX-90

Some Atmospheric Surface Layer Characteristics over Varanasi from MONTBLEX-90

Features of thermals in stable wake and neutral stratifications in the disturbed monsoon boundary layer

Observation of Double-mixing Line Structure in the Convective Boundary Layer During the Summer Monsoon Season

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