NOPR Community:http://nopr.niscpr.res.in/handle/123456789/255682026-10-09T21:39:44Z2026-10-09T21:39:44ZOn the stability of atmospheric surface layer along the monsoon rough region over IndiaPatil, M NParasnis, S Shttp://nopr.niscpr.res.in/handle/123456789/305972016-07-20T05:11:57Z2001-10-01T00:00:00ZTitle: On the stability of atmospheric surface layer along the monsoon rough region over India
Authors: Patil, M N; Parasnis, S S
Abstract: <span style="mso-bidi-language:HI">Stability characteristics in the atmospheric
surface layer over dry convection, moist convection and alternate deep moist/unsaturated
convection zones of the monsoon trough have been explored using the tower data
of wind and temperature obtained during monsoon trough boundary layer
experiment (MONTBLEX). In general, different characteristics in three
sub-layers of a 1-30 m layer were observed before, during and after the onset
of monsoon. Before onset of the monsoon, 1-4 m layer was stably stratified over
dry convection (western end) and moist convection (eastern
<span style="mso-bidi-language:HI">end) zones of the monsoon trough. After the onset
of monsoon, inversion in this layer was not noticed. These results may possibly
be attributed to the local effect.
</span></span>
Page(s): 266-2722001-10-01T00:00:00ZCharacteristics of turbulence in the atmospheric surface layer over a complex terrainMurthy, B SDharmaraj, Thttp://nopr.niscpr.res.in/handle/123456789/305962016-07-20T05:11:07Z2001-10-01T00:00:00ZTitle: Characteristics of turbulence in the atmospheric surface layer over a complex terrain
Authors: Murthy, B S; Dharmaraj, T
Abstract: <span style="mso-bidi-language:HI">Measurements of fluctuating wind components and
temperature have been made in the atmospheric surface layer over a complex
terrain in the campus of the Indian Institute of Tropical Meteorology, Pune,
using sonic anemorneter at 5.2 m above the surface. Characteristics of
turbulence, i.e. spectra of wind velocity components and turbulence statistics
of wind are presented. The peak of normalized <i>w</i>-spectrum over a complex
terrain for near-neutral condition was found to be ~ 0.6 as compared to ~ 0.4
over homogeneous terrain. The non-dimensional frequency maximum for <i>w</i>-component
spectrum was observed to be 0.9 as compared to ~ 0.5 over homogeneous terrain.
Empirical formulae for standard deviation of velocity components have been
tested against observations over hilly terrain. Vertical flux of turbulence
kinetic energy as a function of stability is also discussed.
</span>
Page(s): 260-2652001-10-01T00:00:00Z<span style="mso-bidi-language:HI">A model study of the atmospheric heating rates due to O<sub>3</sub>, H<sub>2</sub>O and O<sub>2</sub> </span>Lal, Mhttp://nopr.niscpr.res.in/handle/123456789/305952016-07-20T05:09:38Z2001-10-01T00:00:00ZTitle: <span style="mso-bidi-language:HI">A model study of the atmospheric heating rates due to O<sub>3</sub>, H<sub>2</sub>O and O<sub>2</sub> </span>
Authors: Lal, M
Abstract: <span style="mso-bidi-language:HI">The height distribution of solar heating rate due
to ozone, water vapour and oxygen molecule from ground to 100 km altitude has
been examined in this study. The cooling rate due to infrared emission of CO<sub>2</sub>,
O<sub>3</sub> and water vapour molecules
<span style="mso-bidi-language:HI">has also been studied for middle atmospheric
region. The heating and cooling rates have been calculated for midlatitude and equinox
condition. The diurnal variation of net radiative temperature change in
tropospheric and stratospheric region causes <span style="mso-bidi-font-family:
Arial;mso-bidi-language:HI">I
<span style="mso-bidi-language:HI">generation of waves, which propagate in the
mesospheric region and affects the climatology of the upper atmosphere. The heating
rate due to water vapour is found to be important in the troposphere, ozone
heating is Significant in the stratosphere,
<span style="mso-bidi-language:HI">and oxygen heating rate is found to be important
in the mesospheric region. The maximum ozone heating rate in the stratospheric
region is found to be ~ 15 K/day. The cooling rate is due to CO<sub>2</sub> is
very significant in the stratospheric region and its found to be about -12
K/day. The net radiative temperature change due to heating and cooling has been
obtained to be similar to the atmospheric temperature profile.
</span></span></span></span></span>
Page(s): 254-2592001-10-01T00:00:00ZStudy of travelling ionospheric disturbances using IPS array at RajkotJadeja, A KJadav, R MVats, Hari OmIyer, K Nhttp://nopr.niscpr.res.in/handle/123456789/305942016-07-20T05:06:24Z2001-10-01T00:00:00ZTitle: Study of travelling ionospheric disturbances using IPS array at Rajkot
Authors: Jadeja, A K; Jadav, R M; Vats, Hari Om; Iyer, K N
Abstract: <span style="mso-bidi-language:HI">Using a novel radio astronomical technique, the
presence of travelling ionospheric disturbances (TIDs) are detected from
observations of radio star signals by the interplanetary scintillation (IPS)
system at Rajkot for the first time in India.
<span style="mso-bidi-language:HI">The periods of the TIDs (20-24 min) and
north-south component of their velocity (66-273 m/s)<i> </i>indicate that they
belong to the medium scale category. The results are discussed in the light of
a model of atmospheric gravity waves (AGWs) originating in auroral electrojet
region and propagating meridionally equatorward.
</span></span>
Page(s): 249-2532001-10-01T00:00:00Z