JRF applications

CSIR-JRF register numbers
200167 of June 2008
200377 of December 2008

PRL application register number 01383.
IISc application register number 355797

IIT Kharagpur application send on 24th March 2009


Applied for IITM JRF
(Advertisement No:PER/4/ 2009 dt. 19 May 09)

SPL VSSC application number RBZ7V51

Space application centre 01091409000022


Joined IITM as Research Fellow under Dr SuryaChandra Rao on 15 sep 2009

control structors in GrADS

Prompt 'Enter the folder name: '
pull fld
'!mkdir ../'fld
prompt 'enter the year as yyyy :'
pull yyyy
prompt 'enter the month as number 1 to 12 :'
pull n
if(n=1)
mmm='jan'
endif
if(n=2)
mmm='feb'
endif
if(n=3)
mmm='mar'
endif
if(n=4)
mmm='apr'
endif
if(n=5)
mmm='may'
endif
if(n=6)
mmm='jun'
endif
if(n=7)
mmm='jul'
endif
if(n=8)
mmm='aug'
endif
if(n=9)
mmm='sep'
endif
if(n=10)
mmm='oct'
endif
if(n=11)
mmm='nov'
endif
if(n=12)
mmm='dec'
endif
prompt mmm' '
prompt

dd=1
while(dd<=30)

'reinit'
'sdfopen slp.'yyyy'.nc'

'set lat 5 25'
'set lon 60 90'
'set time 'dd''mmm''yyyy''

'set grads off'
'set gxout shaded'
'd slp'
'cbarn'
'draw title slp 'yyyy' 'mmm' 'dd' '
'printim ../'fld'/slp'yyyy''n''dd'.jpg white'

dd=dd+1
endwhile

Trend using 3year running mean (Grads)

*warning:this is a very difficult job using the extreme of your processors ability.
*so be careful... the program take very much time
*trend analysis
'!mkdir trend3out'
'reinit'
'open rf_5103.ctl'
'clear'
'set lat 10'
'set lon 75'
'set time 01Oct1951 31Dec2003'
'set grads off'
'define r=aave(rf,lon=70,lon=80,lat=8,lat=13)'

'define s0=ave(r,time=01Oct,time=31Dec)'
'd s0'

'draw title Rain trend 1951-2003 '
'printim trend3out/rain_trend0.jpg white'

i=1
while(i<=50)

'define s'i'=ave(s'i-1',t-365,t+365)'
'undefine s'i-1
'clear'
'd s'i''
'draw title Rain trend 1951-2003 '
'printim trend3out/rain_trend'i'.jpg white'

i=i+1
endwhile

Interannual variation of rainfall as bar chart(GrADS)

'reinit'
'open rf_5103.ctl'
'set lat 10'
'set lon 75'
'set grads off'
'set time 01jan1951 31Dec2003'
'define valr=aave(rf,lon=70,lon=80,lat=8,lat=13)'
'define mean=ave(valr,time=1oct,time=31dec)'
'set gxout bar'
'd mean'
'fprintf mean unni.txt'

penta-day running mean (GrADS)

'!mkdir rain9'
yyyy=1951
while(yyyy<=2003)

'reinit'
'open rf_5103.ctl'
'set lat 10'
'set lon 75'

'set time 01Oct'yyyy' 31Dec'yyyy
'set grads off'
'define r=aave(rf,lon=70,lon=80,lat=8,lat=13)'
'define pent=ave(r,t-2,t+2)'
'd pent'
'define mean=ave(r,time=01Oct'yyyy',time=31Dec'yyyy')'
'd mean'
'draw title Rain 'yyyy' '
'printim rain9/rain'yyyy'.jpg white'

yyyy=yyyy+1
endwhile

RMS of deviation(grads)

'!mkdir rain7'
yyyy=1951
while(yyyy<=2003)

'reinit'
'open rf_5103.ctl'
'set lat 10'
'set lon 75'

'set time 01Oct'yyyy' 31Dec'yyyy
'set grads off'
'define r=aave(rf,lon=70,lon=80,lat=8,lat=13)'
'd r'
'define mean=ave(r,time=01Oct'yyyy',time=31Dec'yyyy')'
'define dev=((r-mean)*(r-mean))'
'define rmsdev=sqrt(ave(dev,time=01Oct'yyyy',time=31Dec'yyyy'))'

'd mean-rmsdev'

'd mean'

'd mean+rmsdev'


'draw title Rain 'yyyy' '
'printim rain7/rain'yyyy'.jpg white'

yyyy=yyyy+1
endwhile

Mean and mean deviation (grads)

'!mkdir rain4'
yyyy=1951
while(yyyy<=2003)

'reinit'
'open rf_5103.ctl'
'set lat 10'
'set lon 75'

'set time 01Oct'yyyy' 31Dec'yyyy
'set grads off'
'define r=aave(rf,lon=70,lon=80,lat=8,lat=13)'
'd r'
'define mean=ave(r,time=01Oct'yyyy',time=31Dec'yyyy')'
'define dev=abs(r-mean)'
'define mdev=ave(dev,time=01Oct'yyyy',time=31Dec'yyyy')'

'd mean-mdev'

'd mean'

'd mean+mdev'


'draw title Rain 'yyyy' '
'printim rain4/rain'yyyy'.jpg white'

yyyy=yyyy+1
endwhile

rf_5103.ctl

DSET rf_5103.grd

TITLE 1.0 degr analyzed grids 1951-2003

UNDEF -99.90

XDEF 35 LINEAR 66.5 1.0

YDEF 32 LINEAR 6.5 1.0

ZDEF 1 linear 1 1

TDEF 19358 LINEAR 1jan1951 1DY

VARS 1

rf 0 99 GRIDDED RAINFALL

ENDVARS

Hoffmuller (latitude-time)

prompt 'Enter the keyword: '
pull key
'!mkdir hoff_'key
lon=0
while lat<180


'reinit'
'sdfopen monmeandata/'key'.mon.mean.nc'
'q file'
'set lat -90 90
'set lon 'lon
'set t 1 12'
'set xyrev on'
'd 'key
'draw xlab Longitude'
'draw ylab Time'



'printim hoff_'key'/'lat'.jpg white'

lat=lat+1
endwhile

Litrature review

1.
On the variability and prediction of rainfall in the postmonsoon season over india
by Nityanad Sigh and N.A. Sontakke,Indian Institute of Tropical Meteorology,Pune
published in International journal of climatology(1999), page 309-339.

2.
Objective ditermination of Northeast Monsoon Onset dates over costal Tamil Nadu for
the period of1901-'90 by Y.E.A Raj, Regional Meteorological Centre, Madras
published in Mausam(1992)43,3 page 273-282.

3.
Inter and Intra-seasonal variation of thermodynamic parameters of the atmosphere
over costal Tamil Nadu during Northeast Monsoon
by Y.E.A Raj, Regional Meteorological Centre, Madras
published in Mausam(1996)47,3 page 259-268

4.
Unrevelling the mystery of Indion Ocean Monsoon failure during El-Nino
by K. Krishnakumar, Balaji Rajagopalan, Martin Hoerling, Gary Bales, Mark Cane

5.
Air-Sea interaction on a seasonal scale over North Indian Ocean Part 1
Inter-anual variation of seasurface temperature and Indian summer Monsoon Rainfall
by P.V. Joseph and P.V. Pillai,Meteorological office, Pune
Published on Mausam(1984) 35,3 Pages 323-330

6.
Air-Sea interaction on a seasonal scale over North Indian Ocean Part 2
Monthly mean atmospheric and oceanic parameters during 1972 and 1973
by P.V. Joseph and P.V. Pillai,Meteorological office, Pune
Published on Mausam(1986) 37,2 Pages 159-168

7.
An Ocean Atmosphere interaction mechanism for the active break cycle of the
Asian Summer Monsoon by P.V. Joseph and T.P. Sabin
published in Climate Dynamics(2008)30 Pages 553-566.