Hi Alex, Just to clarify…wouldn't you always be plotting the 5-year average bias when computing a "bias" for a 5-year climatology? It looks like the bias is systematic for the 5 years, but not identical.
Paul From: Alex Goodman <alex.good...@colostate.edu<mailto:alex.good...@colostate.edu>> Date: Wednesday, June 4, 2014 3:53 PM To: "Boustani, Maziyar (398F)" <maziyar.boust...@jpl.nasa.gov<mailto:maziyar.boust...@jpl.nasa.gov>> Cc: Paul Loikith <paul.c.loik...@jpl.nasa.gov<mailto:paul.c.loik...@jpl.nasa.gov>>, "dev@climate.apache.org<mailto:dev@climate.apache.org>" <dev@climate.apache.org<mailto:dev@climate.apache.org>> Subject: Re: Model Observation Evaluation exmaple Hi Mazi, I am in agreement with Paul. It is also clear from a quick inspection of your plots that the model bias for each year is identical, so plotting just the 5-year average bias would give you sufficient information. You might want to take a quick glance at IPCC AR5 WG I, Ch. 9 [1] for some good examples. Thanks, Alex [1] - http://www.climatechange2013.org/images/report/WG1AR5_Chapter09_FINAL.pdf On Wed, Jun 4, 2014 at 4:48 PM, Boustani, Maziyar (398F) <maziyar.boust...@jpl.nasa.gov<mailto:maziyar.boust...@jpl.nasa.gov>> wrote: Here is the attached [1]. [1]: http://oi58.tinypic.com/w7yo2q.jpg …………………… Maziyar Boustani Software Engineer - GIS Developer Science Data Understanding Group Jet Propulsion Laboratory, California Institute of Technology 4800 Oak Grove Drive, Pasadena, CA, 91109 maziyar.boust...@jpl.nasa.gov<mailto:maziyar.boust...@jpl.nasa.gov> On Jun 4, 2014, at 3:35 PM, Loikith, Paul C (329C-Affiliate) wrote: Hi Mazi, This should be one plot total. When you compute a bias, conventionally it's just one bias for the entire time period so there should be one plot. You could have multiple plots if you were computing the bias for all 4 seasons, but for annual there should only be one. When you say you temporally regridded to 365 days, what do you mean by this? The model and obs data are monthly, correct? So shouldn't you just be computing the mean difference between the obs and the model? Please let me know if you need further clarification. Thanks, Paul From: <Boustani>, "Maziyar (398F)" <maziyar.boust...@jpl.nasa.gov<mailto:maziyar.boust...@jpl.nasa.gov>> Date: Wednesday, June 4, 2014 3:12 PM To: Paul Loikith <paul.c.loik...@jpl.nasa.gov<mailto:paul.c.loik...@jpl.nasa.gov>>, "good...@apache.org<mailto:good...@apache.org>" <good...@apache.org<mailto:good...@apache.org>> Cc: "dev@climate.apache.org<mailto:dev@climate.apache.org>" <dev@climate.apache.org<mailto:dev@climate.apache.org>> Subject: Model Observation Evaluation exmaple Hi Paul and Alex, I ran a test code to evaluate one model [1] with one observation[2]. You can find the result as attached. This has been temporally regrided for 356 day, so we going to have 5 years of data and that is why we have 5 plots. Do you guys thinks this is correct to have one plot for each time or it should be one plot for entire time? Metric = Bias parameter_id = 38 dataset_id = 10 min_lat = 0 max_lat = 20 min_lon = 0 max_lon = 20 start_time = 2000-01-01 00:00:00 end_time = 2004-12-01 00:00:00 [1] : AFRICA_UQAM-CRCM5_CTL_ERAINT_MM_50km_1989-2008_tas.nc (variable = TAS) [2] : CRU3.1 Daily-Mean Temperature (parmeter_id = 38) <model_vs_obs_bias.png> …………………… Maziyar Boustani Software Engineer - GIS Developer Science Data Understanding Group Jet Propulsion Laboratory, California Institute of Technology 4800 Oak Grove Drive, Pasadena, CA, 91109 maziyar.boust...@jpl.nasa.gov<mailto:maziyar.boust...@jpl.nasa.gov> <model_vs_obs_bias.png> -- Alex Goodman Graduate Research Assistant Department of Atmospheric Science Colorado State University
