Agenda:
2:00 - 2:05 pm, Gil Compo, co-Chair CRFT- Introduction
2:05 - 2:25 pm, Craig Long, CPC - Improving the stratosphere in reanalysis
2:25 - 2:30 pm, Discussion
2:35 - 2:55 pm, Gil Compo, CIRES and PSD - Improving the prognostic ozone parameterization in the NCEP GFS and CFS for climate reanalysis and operational forecasts
2:55 - 3:00 pm, Discussion and planning for next call
Ek, land data assimilation
Dong, benchmark diagnostics for CFSR and 20CR
Yu, Evaluating CFSR air-sea heat, freshwater, and momentum fluxes in the context of the global energy and freshwater budgets
Presentations:
Notes:
Re: operational analysis stratosphere compared to reanalysis
Gil,
For some parameters the variance between the various reanalyses has decreased approching the present. This is true for QBO winds. Model biases at the top of their models still exits. Biases can always be eliminated. The anomalies may be of more importance. The variance of the anomalies of the various reanalyses for the recent 5-10 years is much lower than the 1980's. This is due to more satellite observations. There may always be some difference between one reanalysis vs another, for instance, the ERA-I gives more weight to radiosondes than MERRA does. An interesting comparison in the near future between the reanalyses will be to see how their sfc+radiosonde only runs compare and how different they are with the runs including satellite data.
Craig
Re: Climate Reanalysis Task Force Telecon - 30 October 2013
In the Q&A of Craig's talk there was a comment that some of the issues may be attributed attributed to NOAA7 Ch2 (SSU?) problems. I didn't know the voice. I'm curious if between Craig and who mentioned that channel, if I could get a brief synopsis from them of the problem and why that channel might be a problem, or related to Craig's problem. 1) I want to search through MERRA O-F to see if I can see a problem there and 2) recommend to the DA group we flag the data for that channel if need be.
MERRA used a Goddard RTM for SSU, because CRTM was not ready when MERRA started. However, MERRA2 will be using CRTM for SSU. We are having a meeting 10/31, but we expect to begin MERRA2 once all the i's are dotted and t's crossed (1 week, maybe?) If this April data should be flagged, I need to get on it soon. Any guidance is appreciated!
Re: Climate Reanalysis Task Force Telecon - 30 October 2013
Mike,
That was Jack Woolen discussing the NOAA-7 SSU issue. Jack noticed that when we begin using NOAA-7 SSU data in 1981 that model errors increase. The NOAA-7 SSU Channels 2 and 3 had rapid cell pressure changes during the first year or two. (See figure 2 of Kobayashi et al, QJRMS 135, 2009) The CRTM should know about these cell pressures changes and the forward model should make correct radiances. Even so, our in house expert, Cheng-Zhi Zho cautions us about using NOAA-7 data. We are going to run a test for the period when both NOAA-6 and NOAA-7 data are available to see if just usng NOAA-6 improves things.
Craig
Re: Climate Reanalysis Task Force Telecon - 30 October 2013
That helps, much thanks! Also, I am now getting the emails of TF comments and updates.
operational analysis stratosphere compared to reanalysis