S S cientific cientific A A dvisory dvisory C C ommittee ommittee (SAC) Review: 2010 (SAC) Review: 2010 S S cientific cientific A A dvisory dvisory C C ommittee ommittee (SAC) Review: 2010 (SAC) Review: 2010 Characterization of “Atmospheric Boundary Layer” with the aid of Numerical Atmospheric Models and Field Experiments: Research Highlights (2009-2010) Characterization of “Atmospheric Boundary Layer” with the aid of Numerical Atmospheric Models and Field Experiments: Research Highlights (2009-2010) D. Bala Subrahamanyam B oundary L ayer P hysics and A tmospheric M odelling Space Physics Laboratory, VSSC, Thiruvananthapuram D. Bala Subrahamanyam B oundary L ayer P hysics and A tmospheric M odelling Space Physics Laboratory, VSSC, Thiruvananthapuram
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Balloon-borne Pisharoty GPS Ascents(14-15 January 2010)
(Upper Air Meteorological Measurements)
0800 LT1000 LT1230 LT1430 LT
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Reduction in incoming
solar radiation by a magnitude of about 600
Wm-2
39
40
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Delayed Onset of Sea Breeze on TSE Day !!!
42
Shrinking of Sea Breeze Front (Vertical Thickness) due to TSEControl Day ~ 700 m; TSE Day ~ 300 m
43
Shrinking of Sea Breeze Front (Vertical Thickness) due to TSE gradually vanished after the eclipse
Control Day ~ 500 m; TSE Day ~ 400 m
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Rapid Fall in the altitude of maximum convection (corresponding to minimum in delta theta)
OVER TO NEXT THEME: MOKSHA ---->
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Monsoon Onset over Kerala through Systematic Horizontal Advection
(MOKSHA)
Monsoon Onset over Kerala through Systematic Horizontal Advection
(MOKSHA)
46
MOKSHA: Motivation and Background...Normal Dates of Onset of South-West Monsoon
Courtesy: IMD Website
(www.imd.gov.in)
47
MOKSHA: Motivation and BackgroundMOKSHA: Motivation and Background
Courtesy: IMD Website
(www.imd.gov.in)
48
MOKSHA: Motivation and Background...Advancement of Indian South-West Monsoon
MOKSHA: Motivation and Background...Advancement of Indian South-West Monsoon
49
MOKSHA: Motivation and Background...Advancement of Indian South-West Monsoon
MOKSHA: Motivation and Background...Advancement of Indian South-West Monsoon
50
MOKSHA: Objectives ...MOKSHA: Objectives ...
➢What is the response of “Atmospheric Boundary Layer” to the Indian Summer Monsoon during its onset phase over Kerala ?
➢Whether the intrusion of moisture within the ABL from neighboring oceans during the onset phase of SW-monsoon is really systematic resulting into subsequent rainfalls (As shown through onset dates !!!)
➢What could be the possible role of ABL dynamics in SW-monsoon associated precipitation and whether both have got any feedback mechanism governing the rainfall intensities ?
....
Essentially MOKSHA does not aim at prediction of Monsoon !!!!
51
MOKSHA: Science Plan Conceived ...MOKSHA: Science Plan Conceived ...
Preliminary Earmarked Objectives:-
➢Investigation in modulations in mixed layer heights and ABL characteristics over the Kerala Coast with the onset of SW-monsoon.
➢Study of spatial homogeneity/heterogeneity in rainfall during onset phase of SW-monsoon over Kerala.
➢Quantitative Investigation of intrusion of moisture from Oceans to landmass (Kerala) during onset phase of SW-monsoon with the aid of Regional Atmospheric Models.
➢Generation (Gathering) of ABL measurements database during onset phase of SW-monsoon.
52
MOKSHA: Pilot Phase (2009)MOKSHA: Pilot Phase (2009)
Database:May 20 – June 01, 2009:One Pisharoty Sonde per day simultaneously from TERLS (Thumba) and SNOM (Cochin)
May 15 – Sept 15, 2009:Surface layer meteorological observations from about 37 ISRO AWS stations within Kerala under PRWONAM Network
++ All other ABL instruments at ATS, TERLS.
53
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
54
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
Formal Date of SW-Monsoon Onset: 23 May 2009
55
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
How systematic was the horizontal advection of moisture and associated rainfall over Kerala in SW-monsoon (2009) !!!
56
Rainfall Vs. Mixed Layer Heights
OVER TO NEXT THEME: HRM ---->
57
High-resolution Regional Model (HRM) Simulations in support of GSLV-D3 and
PSLV-C14 Launch:
Towards improvements in Model Simulations
Anurose T. J. and D. Bala Subrahamanyam
High-resolution Regional Model (HRM) Simulations in support of GSLV-D3 and
PSLV-C14 Launch:
Towards improvements in Model Simulations
Anurose T. J. and D. Bala Subrahamanyam
58
End Users
Provided for HRM by DWD
Topographical Data
Initial data (Analysis)
Lateral Boundary Data
ModelProducts
RegionalNWP
System: HRM
General Structure of Regional NWP System: High-resolution Regional Model (HRM): An Overview
General Structure of Regional NWP System: High-resolution Regional Model (HRM): An Overview
59
Launch Commit Criteria Requirements ...
(1) Probability of Occurrence of thunderstorms during different stage fuel fillings(2) Location of Thunderstorms in the near-proximity of launch site(3) Rainfall Intensity and duration (4) Maximum Possible magnitudes of surface layer winds during movement of launch vehicle(5) Maximum expected change in altitudinal profiles of winds over SHAR....
60
+18 Hrs Forecast
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+24 Hrs Forecast
62
HRM Predictions Vs. NCEP/NCAR Reanalysis
63
Impact of high-resolution topography in Regional Atmospheric Models....
Two Different Cases: Case 1: HRM Orography is higher than the GME Orography
(A mountain's realistic elevation is under-estimated in Global Model)
Case 2: HRM Orography is lower than the GME Orography(A Flat ground is over-estimated as an elevated mountain in Global Model)
Sensitivity of Precipitation to Convective Schemes..
67
Experiences Gained:
Choice of Model Domain: How to avoid Steep topography ??
Choice of Topography (Expense: Model Run Time): Global Model to Regional Models
Choice of Convective Schemes: Widespread rainfall over isolated rainfall ?
Choice of Grid Size (and Model Time Step): As per Users' Need
68
FUTURE PROJECTIONS ....HRM Verification studies with three different topographical datasets (0.25, 0.10 and 0.0625 deg. resolutions)
Data Assimilation (TEMP, SYNOP + Satellite Observations) in HRM for improving the forecast quality...
Continuation of Sea/Land Breeze Circulation Study (Observations + Model) with special emphasis on the dynamics of formation of the return flow (++ AACCR)
MOKSHA – Next Phase (++ ADB)
Indigestion of Field Experiments Database into the Model
69
FUTURE PROJECTIONS (Long Terms....)
Our Preparedness for Future Generation Global Models (Global Centres are pushing the regional centres for smaller and smaller grid size models)
Let us no more remain “just” the Users of a “model”.....Lets us contribute something (HRM Scheduler...)
Expansion of ABLN&C network stations and to augment the basic minimum experimental set-up and their usage in Regional Climate Models