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admin: Welcome all to today's chat on "Present
Scenarion in Atmospheric Sciences" . Dr. Atma Ram Jain is here
with us as an expert. Please ask your questions
Vivek Panwar: hello sir can i start questioning
Vivek:tropopause have different height at different places,
why it is so?
Dr. Atma Ram Jain: hello Vivek, yes you can ask question to
Dr. Jain
Vivek Panwar: how u define this present scenario of
atmospheric sciences
Dr. Atma Ram Jain: Present Scenario is very exciting and
future is very bright
Vivek Panwar: In India where we can start our future in
atmospheric sciences means tell me the name of some good
laboratories
Vivek Panwar: In India where we can start our future in
atmospheric sciences means tell me the name of some good
laboratories
Dr. Atma Ram Jain: There are number of excellent laboratories
which covers the different components of Atmospheric Sciences
including environmental studies so of the laboratories are
Dr. Atma Ram Jain: NEERI , NPL , PRL , NARL , SAC Ahemdabad,
SPL Trivendrum, IIGM Mumbai, IITM Pune and NCMRWF Noida,
Dr. Atma Ram Jain: and so on
rishu gautam: good aftar noon sir
Dr. Atma Ram Jain: Rishi Good After noon
Vivek Panwar: What is the basic requirement to enter in these
laboratories?
Dr. Atma Ram Jain: Ask your Question
rishu gautam: i am cofused about tropopause temperature. Can
u please tell me the exact defination of Tropopause
rishu gautam: i am cofused about tropopause temperature. Can
u please tell me the exact defination of Tropopause
Dr. Atma Ram Jain: Vivek, Most of the laboratories take students at
masters level and provide a research fellowship programme for
training and research for full time Job as a Scinetist, However a
Phd Degree or Few years research experince with one or two
publication would be helpful
Dr. Atma Ram Jain: Rishu, There are number of defination of
tropopause but most commonly used defination are as follows
Vivek Panwar:Now a days Stratosphere troposphere exchange is
an hot topic
Vivek Panwar: how can we define it
Dr. Atma Ram Jain: 1. Based on Lapes rate as given by WMO i.e
tropopause is the level where the lapes rate is less then to 2
degree kelvin per kilometere and remain so for 2 more kilometer
Vivek Panwar: what is your opinion about greenhouse gas
emission
Dr. Atma Ram Jain: This defination is most commonaly used by
operational people
Dr. Atma Ram Jain: The second defination is based on CPT i.e
lowest temparture obeserved of the tempratured profile
rishu gautam: what is WMO ?
Dr. Atma Ram Jain: Vivek, The tropopause is a temprature
inversion layer but still there is some mass exchange does take
place thorugh the tropopause, The mass exhande between troposhere
and stratosphere aur between stratosphere and troposphere forms part
of troposphere stratosphereic exchange studies
Vivek: What is potential vorticity?
Dr. Atma Ram Jain: Rishu, WMO stands for worl Metrological
Organisation, This is UNO organisation which keep track of various
matrological data and carries out validation of various data
collected by the groups in different countries
Dr. Atma Ram Jain: Vivek, Potential Vorticity is a measure of
roatation or circulation in terms of potential temprature
Vivek Panwar: what is the probable sources of tropospheric
ozone???
Dr. Atma Ram Jain: Vivek, Green House gas emission have been
like CO2 have been continiously growing at an alarming rate
resulting in global climate change which is most evident from
melting of galciour in arcetic , Antartica , Himalayas and Alps
Vivek: How can convection be studies for earlier periods with
temperature data only
rishu gautam: what is anamoly ? and how will we define
anamoly ?
Dr. Atma Ram Jain: if this continue we in our country will
face serious problem of fresh water for drinking and agricultural
purposes
Dr. Atma Ram Jain: Vivek, There are basicaly three sources of
troposheric ozone, 1. local production , 2 leekage from the
stratosphere that is tropopause and 3. horizental advection from the
other regions of the world
brotati: Sir, What are scope in atmospheric sciences after
class XII
Dr. Atma Ram Jain: Vivek, the sea surface temprature
distribution can give some idea of the convective activity
mohit: hello sir
suresh: hello sir
Dr. Atma Ram Jain: higher sea surface temprature intense will
be the convection, however monitoring of outgoing long wave
radiation i.e OLR is a better way for study the convectivity
Vivek Panwar: What is the role of Indian tropics in STE
rishu gautam: what is anamoly ? and how will we define
anamoly ?
Dr. Atma Ram Jain: Rishu, Anamoly in any parameter is just
defined as a departure from the long term mean value of the
parameter
Dr. Atma Ram Jain: brotati, After 12th you should go gor
Graduation in Sciences with Physics , Math and Chemistry after
graduation you can do MSc with Physics aur metrology or space
science , I understand that Government of India encourages student
to go for sciences and under talent search even provide scholarship
for bright student
mohit: is there any satellite to study tropical weather and
climate?
Vivek: Sir, is there any role of water vapour in decreasing
ozone in stratosphere
Muneesh: Hi, Sir, I am Muneesh.
Vivek: Sir, is there any role of water vapour in decreasing
ozone in stratosphere
Muneesh: Why is it so very difficult to predict weather? Why
do we rely on statistical methods so much?
Dr. Atma Ram Jain: Vivek, tropics over india and in other
longitute zone participates actively in strotosphereic and
tropospheric exhange i.e STE this is because tropics are the sources
region of intensed convection and cyclonic activity hence this
region acts as a heat engine converting additional heat available
over the tropics into mechanical energy in the form of intensed
winds including very large vertical velocities, convecting activity
thus carries the boundry layer air and lower troposhperic air to
higher hieghts to the upper troposhpere and sometimes into the lower
stratosphere
Dr. Atma Ram Jain: This air which is carried by the
convection higher up by convectic and cyclonic activity is then
carried over to Higher latitute by the ciruclation like Brewer
Doption
Dr. Atma Ram Jain: Mohit , Yes there are number of statellite
for this purpose india's Kalpana 1 is one such satellite
Vivek Panwar: What is radiative forcing?
Vivek Panwar: What is radiative forcing?
rishu gautam: what isdefference between potential temp. and
Normal Temp.
Dr. Atma Ram Jain: Vivek, yes Increase in water vapour tends
to delay the recovery of stratosphereic ozone and vice versa
rishu gautam: what is the defference between potential temp.
and Normal Temp.
Vivek: Tropics being the source region of heat engine driving
the enhanced vertical winds and enhances vertical winds are found in
the most convective zone, is it so?
Dr. Atma Ram Jain: Muneesh,prediction of weather is so
difficult because number of parameters and there variablity is
involved , However with the improved instrumentation the accuracy of
the data is improved, Now a days there is more dependence on the
modeling aspect of the forcasting rather then the stastical
parameter there is a good amount of success in predicting weather
now for period of less than 5 days but periods higher than 5 days
problem still persists beacuse that requires much more varsetile
models for prediction
Dr. Atma Ram Jain: vivek,radiative forcing is the change in
atmospheric parameters beacuse of the radiation energy at various
hight levels
brotati: Sir, I would like to know the scope of atmospheric
sciences after Class XII
Dr. Atma Ram Jain: Rishu, Potential temprature is defined in
terms of standard pressure say 1000 mili bar where as the normal
temprature is the actual atmospheric temprature measured by insitu
instruments
Dr. Atma Ram Jain:Vivek, your can you put this question in a
better way
Dr. Atma Ram Jain: brotati, I have replied your question
Muneesh: When do we use analytical methods for prediction of
weather? When do we use statistical methods?
Dr. Atma Ram Jain: Vivek, that is true tropic being the
source region
Vivek Panwar:What is radiative forcing
Dr. Atma Ram Jain: Muneesh, Statistical methods are used when
actual observation data is limited other wise it is always desirable
to use analytical methods and this is possible enhanced
computational power avialble now for weather modeling
suresh: why atmosphere temprature change frequently?
Vivek Panwar: Is there any role of circulation cells(Hadley
cell , ferrel cell, Polar) in STE
Muneesh: With global warming and climate change, what new
approaches we shall need for prediction of Indian Monsson?
Dr. Atma Ram Jain: Suresh, Atmospheric temprature depends on
many factors like topography radiation recieved and wind system etc.
its a dynamical balance between various parameter and a temprature
is one of them if it is very hot at a particuler location the hot
air rises up resulting in decreaing pressure at that particular
location and bringing cold air from the sides which immeditaly cools
down the temprature this is what is atmospheric convection
Dr. Atma Ram Jain: Vivek, circulation plays an important role
in atmospheric dynamism
Dr. Atma Ram Jain: Muneesh, we need to be very careful in
monitoring various atmosphereic parameters build a long time series
observation and then use analytical modeling techniques to predict
or forcast of effect of global warming and climate change and inturn
indian monsoon
Muneesh: Sir, how successful is the monsoon prediction model
of IMD?
Dr. Atma Ram Jain:Muneesh, It is difficult to say
Dr. Atma Ram Jain: Hello Dr. Kar please ask question
sckar: Hello Sir
sckar:I know that you have been associated with the MST
radar facility earlier. Can you tell about future programs related
to that in india
Dr. Atma Ram Jain:Dr.Kar, one of the ongoing programme is
MIDAS and palnning another prog. SAFE i.e. from the troposhperic and
stratospheric studies. For details you can have a look at their
website.
sckar: Thank you Sir, all these are observational programmes
or you also have some modeling studies?
admin:Dear Firends, thank you for participating in the chat
session . If you have any more quastions to ask from Dr. JAin,
please send your queries to atma.jain@gmail.com
admin: We wind up the session as of now. Thanks
suresh:thanking you sir
sckar:Thank you.
Our email address is info@vigyanprasar.gov.in
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