JASMINE (Webster et al, 2002) In the year- 1999. Joint Air-Sea Monsoon Interaction Experiment Joint venture between US
1. Shrinking of Tropical Tropopause Layer during Disturbed conditions over Bay of Bengal with JASMINE Measurements
2. JASMINE (Webster et al, 2002) In the year- 1999
10. Data (Webster et al, 2002)
10-15 May (STAR 1) & 21-26 May, 1999 (STAR 2) periods
Mean and Turbulence parameters
Mom and Heat Fluxes Fluxes at 17.7 m height from Sonic Anemometer & Humidity flux at 14.8 m height from IR Hygrometer
SST at 0.05 m depth from Sea Snake Sensor,
Mean Wind and Mean temperatures at heights 14.8 m from ETL (aspirated Vaisala HMP-235) & at 9.6 m from IMET systems
Data received after stringent quality checks by ETL, NOAA group. We independently carried out several quality checks.
Upper air measurements of temperature, humidity, wind & temperature
Vertical resolution of 30-45 m were from Rawin sondes (NCAR ATD)
Frequency: 6-8 per day
Total number of profiles= 163 during 4-31 May
Number of valid profiles during STAR 1= 41,
Number during STAR 2= 32
11. Synoptic Conditions during the period of Analysis
18. Various Tropopause Altitudes identification in GPS Radiosonde profiles
20. Lapse Rate Minimum Altitude (LRMA) Gettelman and Foster (2002)
21. Tropopause variations during Disturbed and Undisturbed conditions
32. Average and std dev of CPTA, CPTT, LRMA, TTL Thickness, Theta at LRMA
34. Do we see any Links between Tropopause layer variations and the Surface parameters during convective conditions? CAPE (Convective Available Potential Energy) is vertical integrated buoyancy Surface Equivalent Potential Temperature, Since the altitude at which convection detrains is constrained by CAPE and ?e at the surface.
39. What causes “CPTA cooler at lower heights” during Disturbed conditions ?
43. Possible mechanisms: