Welcome to Rajeev's Home

 My Scientific Interests

* Atmospheric Aerosols


Remote sensing of aerosols using satellites:


Developed the algorithm for retrieval of aerosol optical depth (AOD)from the 
top-of-atmosphere irradiance in the visible and near IR wavelengths observed over the 
oceans by satellites. The algorithm takes accounts for multiple scattering by aerosols
and molecules and the wind dependent surface albedo. Employing this algorithm, AOT has 
been retrieved using NOAA14-AVHRR data to study the aerosol transport over Indian Ocean
during the NE monsoon season, as part of Indian Ocean Experiment (INDOEX).

Other satellite based studies using : IRS-P3-MOSB, CERES
 
Aerosol studies using Lidars:

Developed an iterative method for the inversion of multiwavelength lidar backscattered
signals to obtain altitude resolved aerosol size distribution (ASD) and altutude 
profiles of aerosol backscattering coefficient. The method has two versions : one forthe 
inversion of a 2-frequency lidar (shape-constraint ASD) and the other for a 
multiwavelength lidar (shape-constraint-free ASD).
 
Aerosol stratification in the nocturnal boundary layer:
(Using Continuous Wave Lidar)

Studied the aerosol stratification in the nighttime boundary layer at the coastal station-
Trivandrum (8.5N, 77.5E), India using a continuous wave lidar. This study revealed aerosol
depletion in the turbulent layers in of atmospheric boundary layer.
 
Aerosol Radiative Forcing

Radiative forcing due to aerosols is being studied using the AOT retrieved using AVHRR
data and the shortwave flux measured by CERES (on board TRMM) over Indian Ocean.
 


* Dynamics of the Low Latitude Middle Atmosphere


(Observations made using Meteor Wind Radar at Trivandrum, India)
(This is my Ph.D thesis!)
Atmospheric Tides in the upper mesosphere and 
lower thermosphere region: 


In diurnal tide (1,1) mode, which is predicted to be the only prominent 
diurnal mode at the low latitude middle atmosphere by tidal theory, is 
not actually the dominent mode. (1,-2) amplitude is usually larger than
(1,1) mode at the equatorial mesopause region. Semi-diurnal and 
ter-diurnal amplitudes are as large as the diurnal amplitude. 
The ter-diurnal tide is not directly generated by the solar forcing, 
but is resulting from the non-linear interaction between diurnal and 
semi-diurnal tides. 
Temperature variations at the mesopause region:

Developed a new methodology for determining temporal variations in 
temperature using the meteor-trail decay rate. Tidal temperature 
fields obatined using this new method is in perfect agreement with 
the tidal fields in wind reported above.
Annual and Semi-Annual Oscillations (AO and SAO)
at the equatorial mesopause:

Above method was used to study the annual and semi-annual variations 
in temperature. The SAO amplitude is higher than the AO amplitudes. 
This was predicted by theory as well - a process generated by the 
gravity waves and high phase speed Kelvin waves.
 


Publications in refereed international journals: 13

Presentations in National and International Symposiums: 16

 

Some of the wonderful and gifted people I could work with:



(This is not a complete list)
Professor V.Ramanathan 
Dr.B.V.Krishna Murthy
Dr.C.Raghava Reddi
Dr.K.Parameswaran
Dr.(Mrs.)Geetha Ramkumar













Visit Indian Space Research Organization (My parent department) 


Visit C4/SIO/UCSD where I did my Post-Doc. 


C4 - Our Lab : Center for Clouds, Chemistry and Climate  

Scripps Institution of Oceanography  

University of California, San Diego  

About me


Education:


B.Sc (Physics)     : S.N.College, Varkala, Trivandrum
                     University of Kerala, India
                     
M.Sc (Physics)     : University Center, Karyavattom, Trivandrum
                     University of Kerala, India

Ph.D (Atmos. Phys) : Space Physics Lab., VSSC, Trivandrum
                     University of Kerala, India

Post-Doctoral Res. : Center for Clouds, Chemistry and Climate
                     Scripps Institution of Oceanography
                     University of California, San Diego, USA



Personal Life:


 
 
Thank GOD for blessing me with JAYA,my simple(but elegant)
loving wife and our wonderful,naughty little daughter! 
They fill my life with joy and happiness.


The Indian Links
INDIA : A Great Nation



Map of INDIA



News Papers and Lot More : Kerala



Map of Kerala 



Mahesh's : Worth Visiting



History of INDIA  



 Wild Life in INDIA  



INDIA : Art and Culture



Malayalam Songs : Jyotheesh 



 Indian Music : Hindi and Regional Film Songs 







Write to me



               

               
               
               
               
               
               

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