1. 24-November-2004CONAE Workshop, Argentina Retrieving SO 2 from TOVS data Laboratory study Dr Fred Prata

2. 24-November-2004CONAE Workshop, Argentina

3. 24-November-2004CONAE Workshop, Argentina Lab Study In this study you will read in a HIRS (TOVS) data file and process the data to produce a map of SO 2 column amounts. You will be able to vary the mapping parameters and see how the software works. The study concentrates on the Cerro Negra eruption on the Galapagos islands in November 1979. There are also pre-processed SO 2 retrievals (.SO2 file extension) for Pinatubo (D267), for Hudson (D220), for Hekla (D230, D232) and for Reventador (D307). These can be read in and mapped. Brightness temperatures for other channels 6.7, 7.3, 11 and 9.6 µm can also be mapped. Refer to the accompanying Swatch document (pdf file) for more details.

4. 24-November-2004CONAE Workshop, Argentina Cerro Negra Eruption Nov 1979 Read data Driver: Galapagos.drv_01 File: HIRS.N05.Y79.D317.AS Cloud height: 8 km Process data Plotting exercise Repeat for Day 318

5. 24-November-2004CONAE Workshop, Argentina Start IDL At the command prompt type: @hirs_start_up.bat Select Driver file from the Menu (use Galapagos.drv_01) Select HIRS data file to read (use HIRS.N05.Y79.D317.AS) Update parameters Process Quicklook Basic Instructions (Refer to the Swatch PDF document in this folder)

6. 24-November-2004CONAE Workshop, Argentina Read an Output file (data previously processed) File: HIRS.N11.Y91.D167.SO2 Plotting exercise Use different channels and use “Display Parameter”

7. 24-November-2004CONAE Workshop, Argentina Change parameters and re-plot (time, geographical coords) Use Display Parameter (select a channel to display) Read in a 2nd file and re-peat (use HIRS.N05.Y79.D318.AS) Read Output File (select.SO2 files - these are already processed so there is no need to Process)

8. 24-November-2004CONAE Workshop, Argentina

9. 24-November-2004CONAE Workshop, Argentina