ISU Atmospheric Component
Update – Part I
3rd RASM Workshop 2012 Fall
Justin Glisan
Iowa State University
Update
• Spectral nudging paper accepted by J. Clim.
– Research funded through original DOE RACM grant
– Co-authors: W.J. Gutowski, J.J Cassano, & M.E. Higgins
• Remaining two papers will be submitted to JGR
• Postdoctoral SOMs research
2
J.Clim. Paper Background
• Long and short PAW simulations were run on the
RACM domain
• A systematic, atmosphere-deep circulation bias
formed within the northern Pacific storm track
• Various remedies tested, but with little success
• Spectral or interior nudging was introduced
J. Clim. Paper Conclusions
• Winter behavior more sensitive to nudging
• Improve Cold Season Mean and Extreme Behavior
– Stronger SN for precipitation
– Weaker SN for surface temperatures
• Improve Warm Season Mean and Extreme Behavior
– Weaker SN for precipitation
– Stronger SN for surface temperatures
Optimal range for pan-Arctic simulations:
1/8th – 1/16th the WRF default
4
ISU Atmospheric Component
Update – Part II
3rd RASM Workshop 2012 Fall
Brandon J. Fisel
Iowa State University
Department of Geological and Atmospheric Sciences
Tucson, AZ 13-15 November
OVERVIEW
 Leap day in RASM
 Solved!
 WRF BC’s file name bug
 ISU plans
3rd RASM November 2012
RASM LEAP DAY
 Possible shift in WRF calendar?
 Compared lagged ERA-Interim (-48, -24,
+24 hrs) with RASM (bad leap, nonspectral, no Feb. 29).
 e.g., -48 hr lag -> ERA-Interim:1992Feb-28-00 UTC – RASM:1992-Mar-0100 UTC.
 Nothing suggestive of a WRF calendar
problem (boundary discontinuities
continue through simulation).
3rd RASM November 2012
r31RBa2 (-48 hrs)
r31RBa2 (-24 hrs)
r31RBa2 (+24 hrs)
RASM LEAP DAY
 LBC tendencies are computed on-the-fly
in real.exe (share/module_bc ->
stuff_bdytend subroutine).
 Modifications made to met_em files.
 2 methods:
 1) blend (Seefeldt)
3rd RASM November 2012
Method 1:
met_em.d01.1992-02-28_00:00:00.nc ->
met_em.d01.1992-02-28_12:00:00.nc ->
met_em.d01.1992-02-29_00:00:00.nc ->
met_em.d01.1992-02-29_12:00:00.nc ->
met_em.d01.1992-03-01_00:00:00.nc ->
met_em.d01.1992-02-28_00:00:00.nc
met_em.d01.1992-02-28_06:00:00.nc
met_em.d01.1992-02-28_12:00:00.nc
met_em.d01.1992-02-28_18:00:00.nc
met_em.d01.1992-02-29_00:00:00.nc
February 29 06, 12 and 18 UTC times left alone because those times are not
important to RASM and will be removed from wrfbdy and wrffdda files after
real.exe is completed.
RASM LEAP DAY
 LBC tendencies are computed on-the-fly
in real.exe (share/module_bc ->
stuff_bdytend subroutine).
 Modifications made to met_em files.
 2 methods:
 1) blend (Seefeldt)
 2) time-stagger
3rd RASM November 2012
Method 1:
met_em.d01.1992-02-28_00:00:00.nc ->
met_em.d01.1992-02-28_12:00:00.nc ->
met_em.d01.1992-02-29_00:00:00.nc ->
met_em.d01.1992-02-29_12:00:00.nc ->
met_em.d01.1992-03-01_00:00:00.nc ->
met_em.d01.1992-02-28_00:00:00.nc
met_em.d01.1992-02-28_06:00:00.nc
met_em.d01.1992-02-28_12:00:00.nc
met_em.d01.1992-02-28_18:00:00.nc
met_em.d01.1992-02-29_00:00:00.nc
Method 2:
met_em.d01.1992-02-28_12:00:00.nc -> met_em.d01.1992-02-28_12:00:00.nc
met_em.d01.1992-02-28_18:00:00.nc -> met_em.d01.1992-02-28_18:00:00.nc
met_em.d01.1992-03-01_00:00:00.nc -> met_em.d01.1992-02-29_00:00:00.nc
February 29 06, 12 and 18 UTC times left alone because those times are not
important to RASM and will be removed from wrfbdy and wrffdda files after
real.exe is completed.
After modification of met_em files, real.exe is run like usual. Following
generation of wrfbdy and wrffdda files, February 29 is removed from files.
Scripts available on Garnet to make modifications to met_em and BC files.
r30RB1g
r31RBa31 (method 1)
r31RBa32 (method 2)
r31RBa31-r31RBa32
RASM LEAP DAY
 LBC tendencies are computed on-the-fly
in real.exe (share/module_bc ->
stuff_bdytend subroutine).
 Modifications made to met_em files.
 2 methods:
 1) blend (Seefeldt)
 2) time-stagger
 both methods produced similar
results; method 2 more simple
 New files ready for use in RASM.
3rd RASM November 2012
WRF BC NAME BUG
 Namelist setting allows user to specify a
different name for BC files.
 Bug – name overwritten to the default
value (WRF v. 3.2 – 3.4.1).
 issue with new leap-day BC file names
 WRF unable to find new Feb. files
 Mediation_integrate.F
3rd RASM November 2012
IF ( .NOT. lbc_opened ) THEN
CALL construct_filename1 ( bdyname , 'wrfbdy' , grid%id , 2 )
WRITE(message,*)'Opening: ',TRIM(bdyname)
CALL wrf_debug(100,TRIM(message))
CALL open_r_dataset ( grid%lbc_fid, TRIM(bdyname) , grid , config_flags ,
"DATASET=BOUNDARY", ierr )
IF ( ierr .NE. 0 ) THEN
WRITE( message, * ) 'med_latbound_in: error opening ',TRIM(bdyname), ' for
reading. IERR = ',ierr
CALL WRF_ERROR_FATAL( message )
ENDIF
CALL construct_filename2a ( bdyname , grid%bdy_inname , grid%id , 2 , "
")
IF ( .NOT. lbc_opened ) THEN
WRITE(message,*)'Opening: ',TRIM(bdyname)
CALL open_r_dataset ( grid%lbc_fid, TRIM(bdyname) , grid , config_flags ,
"DATASET=BOUNDARY", ierr )
IF ( ierr .NE. 0 ) THEN
WRITE( message, * ) 'med_latbound_in: error opening ',TRIM(bdyname), ' for
reading. IERR = ',ierr
CALL WRF_ERROR_FATAL( message )
ENDIF
WRF BC NAME BUG
 Namelist setting allows user to specify a
different name for BC files.
 Bug – name overwritten to the default
value (WRF v. 3.2 – 3.4.1).
 issue with new leap-day BC file names
 WRF unable to find new Feb. files
 Mediation_integrate.F
 WRF folks will implement this fix in the
next version.
3rd RASM November 2012
OVERVIEW
 Leap day in RASM

ISU plans
 Ongoing work
 Key questions
 Diagnostics
 Observational and GCM data
 Coupler/WRF output
3rd RASM November 2012
ISU PLANS
-
ONGOING WORK
 Ongoing regimes and extremes work:
 Expanded the analysis to 17 years (1991 –
2007) using 6-member ensemble CORDEX
simulations.
 Key questions:
 Is there a similar breakdown in the
occurrence of seasonal regime behavior?
 Do we see more persistent regime behavior
becoming the “norm” during summer in recent
years when sea ice is rapidly declining?
3rd RASM November 2012
ISU PLANS
-
QUESTIONS
 ISU research questions:
 What effect does rapid loss in sea ice have on
the energy/moisture budgets? Also in the
future?
 Current and future spatial variations in
energy/moisture budgets and relation to
regime behavior change for same spatial
areas? What effect is there on extremes in
these regions?
3rd RASM November 2012
ISU PLANS
-
QUESTIONS
 ISU research questions (continued):
 If sea ice continues to rapidly decline thereby
also delaying the re-freezing of sea ice,
allowing more heat to be released by the ocean
into the atmosphere, what effect does this
have on future regime behavior?
 How will regimes change in the future? Will
the change in regime behavior be regionally
dependent?
 What effect would changing regime behavior
have on extremes in the future Arctic? A more
extreme Arctic?
3rd RASM November 2012
ISU PLANS
-
DIAGNOSTICS
 Diagnostics:
 Monthly, seasonal and long-term (~20 years)
energy/moisture budget computations.
 Temporal and spatial variations on
energy/moisture budget terms on
interannual and decadal time scales.
 How do modeled (RASM) versus prescribed
(stand-alone WRF) SST affect regime
behavior?
 Do RASM simulations have similar regime
behavior over the same time period?
3rd RASM November 2012
ISU PLANS
-
DIAGNOSTICS
 Diagnostics (continued):
 Sensitivity of RASM energy and moisture
budgets to model resolution.
 How does the NAO and AO affect regime
behavior?
 Influence of feedbacks in RASM versus standalone WRF (cice+ocn+vic+datm).
 What is the interannual and decadal
variability of the net radiation from the ocean?
3rd RASM November 2012
ISU PLANS
-
OBS DATA
 Observation data:
 ERA-Interim (BC’s)
 Global Precipitation Climatology Project
 GEWEX Continental Scale International
Project (GAPP) Surface Radiation Budget
(SRB)
 Pathfinder high resolution surface radiative
fluxes
 Canadian Meteorological Centre daily snow
depth analysis data
 Global Snow-Water-Equivalent Depth
Coefficient-of-Variation Classification
3rd RASM November 2012
ISU PLANS
-
OBS DATA
 Observation data (continued):
 Atmospheric Radiation Measurement (ARM)
Climate Research Facility
 AMSR-E/Aqua Daily 12.5 km Brightness
Temperature, Sea-Ice Concentration, & Snow
Depth Polar Grids
3rd RASM November 2012
ISU PLANS
-
GCM DATA
 GCM data:
 For future RASM simulations, what GCM BC’s
should be used? (e.g., ECHAM5 and HADCM3)
 Sea ice declining faster than in GCM’s. Future
sea-ice decline in RASM vs. GCM’s?
Sea ice (brown) declining faster
than GCM ensemble mean (solid
black).
Image courtesy of:
Stroeve et al., 2007. GRL
doi:10.1029/2007GL029703
3rd RASM November 2012
ISU PLANS
-
OTHER DATA
 Coupler and WRF data:
 Instantaneous vs. average output.
 Need instantaneous values of state variables
for budget studies.
 T, Q, U, V, ect.
3rd RASM November 2012
SUMMARY
 WRF leap-day issue solved.
 WRF namelist bug submitted to wrfhelp.
 ISU will evaluate energy/moisture budgets in
RASM with focus on physical links between
budgets and regimes/extremes.
 GCM data – what GCMs?
 Need instantaneous values for energy/moisture
budget studies.
3rd RASM November 2012