############################################################################## # # # ATOVS and AVHRR Preprocessing Package (AAPP) # # Version 6.10 Release Notes # # 22 June 2009 # # # ############################################################################## 1. Package contents ------------------- The following files are contained in this update release (with file sizes in bytes): RELEASE_NOTE_AAPP_6_10.txt 2803 This release note AAPP_update_6_10.tgz 30494 Source code and data This is an incremental update; users need to have installed version 6.1 and updates 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8 and 6.9. 2. Purpose ---------- Following the launch of NOAA-19, EUMETSAT have conducted an analysis of the MHS brightness temperatures and have determined that some changes are required to the NOAA-19 calibration parameters related to the antenna pattern, specifically the space view correction (in AAPP module mhs_clparams.dat) and the Earth view scan-dependent corrections (in fdf.dat). EUMETSAT have calculated new corrections by revising the noise floor in the pre-launch antenna characterisation. With the new corrections, the level 1c brightness temperatures for MHS channel 1 (89GHz) are lowered by approximately 0 to 4K (depending on scan position and scene temperature) while channels 3 and 4 are lowered by approximately 0.2K to 0.6K. Channels 2 and 5 are not changed. With the new corrections, the brightness temperatures are more consistent with those of NOAA-18 and MetOp-A. This update only affects NOAA-19. 3. Installation --------------- a. Copy the tgz file to your AAPP top directory (i.e. the directory containing AAPP, metop-tools and iasi-tools) b. Unpack it using the command tar -xvmzf AAPP_update_6_10.tgz or if your system does not support the "-z" option in tar, use gunzip -c AAPP_update_6_10.tgz | tar -xmf - c. Go to the AAPP_6 top directory and type make 4. License ---------- To use this software, users need to have registered for AAPP v6 with the NWP SAF (www.nwpsaf.org), and to have agreed to the terms of the license agreement. 5. Version control information ------------------------------ The source package (AAPP_update_6_10.tgz) corresponds to Subversion Revision 158 in the AAPP repository held at the Met Office. 6. Detailed list of changes --------------------------- Key: M=Modified, A=Added, D=Deleted M AAPP/src/calibration/libmhscl/mhs_clparams.dat M AAPP/src/preproc/libatovin/fdf.dat