RETRIEVAL OF TEMPERATURE AND MOISTURE PROFILES OVER BRAZIL USING THE ICI INVERSION SYSTEM João C. Carvalho 1, Lydie. Lavanant 2, Nelson J. Ferreira 1,

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Presentation transcript:

RETRIEVAL OF TEMPERATURE AND MOISTURE PROFILES OVER BRAZIL USING THE ICI INVERSION SYSTEM João C. Carvalho 1, Lydie. Lavanant 2, Nelson J. Ferreira 1, Fernando M. Ramos 1 CONCLUSIONS Areas with high and low water vapor content associated with different air masses are correctly represented by ICI inversion model, especially in oceanic areas. On the other hand, over land, there are regions where the errors are significant. In general, the ICI shows large discrepancy (from CPTEC analysis) over high elevations areas such as the Andes Mountains, and also in the boundary of the air masses (high moisture gradient). The best agreement is found over sea and in areas with large water vapor content. Based on these results one can conclude that in general, the ICI temperature retrievals has achieved a good quality levels, with mean errors around 1.5 K. ABSTRACT This work shows the ability of ATOVS for retrieving temperature and moisture profiles for different atmospheric conditions over Brazil. The analysis was done using the Inversion Coupled with Image (ICI) model, developed at the Centre de Météorologie Spatiale (CMS). To accomplish this work we used 35 days of NOAA-15 satellite data over southeastern Brazil for the 02/23/ /08/2000 period. The ATOVS and AVHRR Processing Package (AAPP) model was used to perform the ingestion and pre- processing of the HRPT data. The obtained temperature and moisture profiles are compared with radiosonde data for different locations in Brazil. Also, the retrieved horizontal fields of temperature and moisture were analyzed for different pressure levels. RMS error of first guess temperature profiles derived from ICI and ICI inversion profiles (over land and sea) for temperature (surface to 10 hPa) and moisture (surface to 500 hPa) profiles over Brazil. VARIABLEGUESS (landICI (land)GUESS (sea)ICI (sea) Data points Temperature (K) Specific Humidity (g/kg) Statistics error for NOAA-15 concerning the mean and standard deviation for land (left) and sea (right) situations of the inversions compared to a) temperature and b) humidity. RMSE of the ICI – radiosonde profiles: a) over land (140 profiles) and b) over sea (22 profiles). 850 hPa specific humidity field and TPWC (mm) derived from NOAA-15: (left) CPTEC analysis; (center) ICI model; (right) ICI - CPTEC analysis. Orbits: 9325 and Date 02/28/2000 at 09h28 and 11h09. Error statistics concerning the bias and the standard deviation (stdev) of the difference between the simulated and measured brightness temperature. The statistics were performed for the 02/28/2000 to 03/08/2000 period, using NOAA-15 data. 1 Instituto Nacional de Pesquisas Espaciais São Jose dos Campos, Brazil 2 Centre de Météorologie Spatiale, Météo France Lannion, France 500 hPa and 850 hPa temperature fields derived from NOAA-15: (left) CPTEC analysis; (center) ICI model; (right) ICI - CPTEC analysis. Orbits: 9325 and Date 02/28/2000 at 09h28 and 11h hPa specific humidity field and TPWC (mm) derived from NOAA-15: (left) CPTEC analysis; (center) ICI model; (right) ICI - CPTEC analysis. Orbits: 9332 and Date 02/28/2000 at 21h54 and 23h hPa and 850 hPa temperature fields derived from NOAA-15: (left) CPTEC analysis; (center) ICI model; (right) ICI - CPTEC analysis. Orbits: 9332 and Date 02/28/2000 at 21h54 and 23h36.