ENSO-monsoon relationships in the CCSM3 coupled runs

Edwin K. SchneiderGeorge Mason University/COLA

ContributorsBen Kirtman (the ideas and direction)Dughong Min (the work)E. Schneider (the travel)

Our ActivitiesInvestigate ENSO-Monsoon relationship in CCSM3 for NVWG collaborative paperT85 and T42 coupled control runsSST forced AGCM simulations

Progress to DatePreliminary look at T85 coupled control run CAM2_T85_B30_009Generate quick-look data set accessible by external usersSome analysis

Quick-Look DatasetGDS or GrADS-Data (DODS) serverDODS URL: http://dataportal.ucar.edu:9191/dods/CAM2_T85_B30_009/atmoscam3000 months (250 years)Fields (from AGCM output)Precipitation (deep and shallow convective, large scale)Wind stress (zonal and meridional)Surface temperature

Using the GDS DatasetIn principle use GrADS to do analysis on data at dataportal. This turns out to be too slow to be practical.In practice write GrADS script to read data from dataportal and write on local workstation. Then do analysis on data at local workstation (so its really the DODS capability, not the GrADS that is important).

Sample UNIX Script## creates binary direct access dataset for year 1 of surface temp.cat tmp.gs'sdfopen http://dataportal.ucar.edu:9191/dods/CAM2_T85_B30_009/atmoscamset gxout fwriteset fwrite /data/tmp/schneide/ccsmts.dataset t 1 12d tsquitEORgradsdods -lc "run tmp.gs"rm tmp.gs

ENSO: DJF Correlation with DJF NINO4 Precipitation

ENSO: DJF Correlation with DJF NINO4 Precipitation

JJAS Correlation with JJAS Indian Monsoon RainfallSSTP

JJAS Correlation with JJAS NINO4 Precipitation

DJF (+1) Correlation with JJAS Indian Monsoon Rainfall

Bottom LineCCSM3 T85 captures a robust ENSO-Asian monsoon relationship that has many similarities to that observed.Very good compared to other CGCMsSimilar to that seen in previous versions of CCSMCCSM3 T42 undoubtedly also goodCCSM3 ENSO mechanism and structure have unrealistic features.