CRTM Working Group Report Paul van Delst and Yong Han Joint Center for Satellite Data Assimilation JCSDA 7 th Workshop on Satellite Data Assimilation May 12-13, 2009

Members At the JCSDA –Yong Han, Paul van Delst, Quanhua Liu, Yong Chen, Banghua Yan, Ron Vogel, David Groff, Tong Zhu, and Fuzhong Weng. Core Team Members –Ben Ruston (NRL), Zhiquan Liu (AFWA/NCAR), Emily Liu (GMAO), Dan Birkenheuer (ESRL), and Ye Hong (NPOESS/Aerospace) Collaborating Team Members –Ralf Bennartz, Tom Greenwald (UWisc-Madison); Ping Yang (Texas A&M); Jean-Luc Moncet, Vivienne Payne, and Alan Lipton (AER Inc.)

CWG Meeting #3, Jul2008 All parties provided updates of work since CWG #2, Apr2008. Action Item summary: –Respond to AER on spectroscopy priorities (P.van Delst and Y. Han). [Occurred after CWG#4] –Address land MW desert emissivity bias (B.Yan and WZheng), produce new empirical emissivity (B.Yan). [Nearly complete – see CRTM poster] –Investigate large CRTM Jacobians responsible for the large stratopause temperature increments at GMAO (Y. Chen and E. Liu). –Address large ocean surface MW emissivity error at high frequency and any other outstanding bias issue in GFS (Q. Liu and B. Yan). –Complete generation of FengYun-3 coefficients (Y. Chen and Y. Han). –Improve User Guide. (P. van Delst). [Still needs much work!] Meeting minutes are downloadable at:

CWG Meeting #4, Feb2009 Delayed due to focus on v1.2 release of CRTM here at JCSDA. All parties provided updates of work since CWG #3, Jul2008. Action Item summary: –Obtain IPO cal/val report that includes updated ATMS instrument characterization (F. Weng). –Contact T. Auligne (AFWA/NCAR) about adding cloudy radiance code to the appropriate CRTM version. (P. van Delst) –Make CRTM historical releases available on CRTM ftp site. (P. van Delst) –Add channel selection for CRTM processing and emissivity. (P. van Delst) –Organize visit of T. Greenwald (UWisc) to the JCSDA to work on SOI integration. (P. van Delst) –Discuss precipitation particle sizes with Z. Liu (AFWA/NCAR) (F. Weng) –Coordinate discussion for continuation of AER funding. (Y. Han) Meeting minutes are downloadable at:

CWG Communications A topic that was discussed at the last meeting was how to improve the level of communication amongst CWG members. Some of the recommendations: –One person to keep track of issues and touch base with each individual group. (Split between PvD and YH) –Bi-monthly contact with members. –CWG shares JCSDA monthly highlights reports, or recent updates, amongst members. A bi-monthly is now sent to the CWG mailing list detailing the activities of the JCSDA members. We still need to further improve communication amongst members, but need to determine best procedure without further burdening members (i.e. with yet more reporting requirements). New CRTM trac page may be useful?

CRTM Repository and trac SCM page The new, public, EMC subversion server is now online and operational. CRTM is one of the projects on that server. Authenticated users can now checkout code directly from the repository. For the first time, all JCSDA CRTM developers have access to the same repository. CWG members (and other users) can apply for server accounts and access. The server also uses the trac SCM tool: –Wiki –Timelines and roadmaps/milestones –Source browser with revision histories –Ticketing system Use Wiki for information sharing amongst CWG members?

CRTM Wiki

CRTM Timeline

CRTM Roadmap

CRTM Browser

CRTM Ticket System

CRTM Testing Meeting, Apr2009 With online repository, JCSDA members discussed testing procedures. Action items (none complete): –Automate the build and test of the CRTM (P. van Delst) –For automation, only overall functional test to be used. Need to determine what needs to be added to that (All) –Coordinate CRTM-in-GSI testing so that we end with a testing harness amenable to automation (Y. Chen and P. van Delst) –Update CRTM Coding Review and Acceptance Guidelines (P. van Delst) –Generic perturbation routines for testing (Volunteers?) –Obtain a “bad” profile set for testing (Volunteers?) –Input data sanitiser for the CRTM that is user selectable (P. van Delst) Decided to use a standard set of instruments for testing: –MetOp-A microwave and IR broadband instruments. –MetOp-A IASI: 19 channels that correspond to the HIRS/4 central frequencies, plus channels 2463 and 5569 for trace gases.

CRTM URLs CRTM trac page CRTM repository (for checkouts, commits, etc) CRTM ftp site ftp://ftp.emc.ncep.noaa.gov/jcsda/CRTM CRTM Announcement mailing list: CRTM CWG mailing list: CRTM Developers mailing list: