Feasibility of Deriving Surface and Atmospheric Parameters over Land using TRMM-TMI B. S. Gohil, Atul K. Varma and A. K. Mathur Oceanic Sciences Division.

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Presentation transcript:

Feasibility of Deriving Surface and Atmospheric Parameters over Land using TRMM-TMI B. S. Gohil, Atul K. Varma and A. K. Mathur Oceanic Sciences Division Meteorology and Oceanography Group Space Applications Centre (ISRO) Ahmedabad , India.

TB ( ,p) = TB DN  (  )(1-  (T S, ,p)) +T S  (T S, ,p)  (  )+TB UP The brightness temperature received by microwave radiometer looking towards earth in non-scattering atmosphere in a thermodynamic equilibrium is given by: TB DN TBUP Surface Ts,  TB TB S    For attenuation by atmospheric gases – Liebe (1992) model  Absorption by non-precipitating clouds – Paris (1971)

Emissivities of (1) first year ice, (2) multiyear ice and (3) open water at H-polarization and 50 o incidence angle (Pedersen, 1988) Assumption:  V19   V23   V37 =  V  H19   H23   H37 =  H  V or  H  0

Constitution of database , T S, TB UP, TB DN, CLW, WV T S – from Climatology Pressure profiles simulated from hydrostatic equation  V and  H are proxy  V is moved from 0.4 tp 1.0 and  H such that  H <  V  V-H =  V -  H = 0 to 0.6 ParameterMinMaxMeanSD SST (K) WV (g/cm 2 ) CLW (g/cm 2 )

Simulation of Water Vapor profiles RH is linearly varied from surface to tropopause RH is varied at the surface Temperature Lapse Rate of Standard Atmosphere are adopted WV profile is derived using RH and T profiles If clouds present RH = 100% at the base of the clouds Surface Tropopause (16 km) RH=0

Simulation of Clouds Case: 1 Case: 2 Case: 3 Freezing level  CLW is maximum at freezing level  CLW (max) = 5% or 10% of cloud thickness in gm/m 3  Raining clouds have not been considered

Minimization Wi is weight, that for water vapor taken as: 0.5 for 19 GHz 0.8 for 23 GHz 0.7 for 37 GHz

TMI Characteristics

Examples of IWV

IWV-July

IWV - July

IWV - July

IWV - June

IWV - June

Examples of Emissivity

Emissivity (V) -July

Emissivity (V) - July

Emissivity - July

Emissivity - June

Emissivity - June

Examples of Emissivity Diff. (V-H)

Emissivity Difference (V-H) -July

Emissivity Difference (V-H) -July

Emissivity Difference (V-H) -July

Emissivity Difference (V-H) -June

Emissivity Difference (V-H) -June

Examples of Land Surface Temperature (LST)

LST -July

LST -July

LST -July

LST -June

LST -June

Examples of CLW

CLW - July

CLW – July

CLW - July

CLW - June

CLW - June

TMI DERIVED GEOPHYSICAL PARAMETERS OVER LAND (JUN 3, ’03-15GMT) (Gohil, et al, 2003)Abs

Comparison NCEP Reanalysis Jun 03, 2003 (Daily Mean) TMI Derived WVC over Land (Jun 03, 2003/15 GMT)(Over ocean – Wentz Product)

Conclusion Study shows good prospects for estimation of Atmospheric and Surface parameters, especially water vapor over land. Study needs to be more refined with more case studies and inter-comparison/validation.

Thanks