CAM5.1

CAM5.1 development simulations


1. Overview

CAM5.1 = CAM5..0 + bugfixes + retunings

Bugfixes
1. A fix to immersion freezing (small changes)
2. Fixing the diagnostic output FICE to trap for roundoff errors (diagnostic only)
3. Bug fix for subgrid cloud water treatment in contact nucleation (small changes)
4. Bug fix for size of snow particles used in radiation (they get smaller by a factor of 3 and more reflective: some impact).
5. Fix to guarantee the in-stratus LWC to be within the specified range even when the cloud fraction is very small ( < 1.e-5 )
6 Fix to prevent model crash by dividing by near zero cloud fraction in the droplet activation routine

Tuning parameters in CAM5.1

  CAM5.1 (1 deg) CAM5.1 (2deg : 156jp) CAM5 (2deg
Dcs 400 400 325
dp1 0.1 0.1 0.04
dp2 500 500 675
rhminl 0.8975 0.8875 0.89
c0_lnd 0.0059 0.0059 0.0020
c0_ocn 0.0450 0.0450 0.0150
dust_emis_fact 0.35 0.35 0.43
rpen 10 5 10


Dcs = 400.
dp1 = 0.1_r8
dp2 = 500.0_r8
cldfrc_rhminl = 0.90D0 ->0.8975D0 (for coupled)
zmconv_c0_lnd = 0.0059D0
zmconv_c0_ocn = 0.0450D0
dust_emis_fact=0.35D0
div24del2flag = 4 (not a tuning parameter)


 

2. Simulations with CAM5 1 degree

CAM standalone

Casename
Description
Diagnostics
Comments
b40_1850_1d_b08c5cn_138j Coupled simulation : 1850 control, 1 degree w/ obs


cam5_0_39_1d_1850_u266 CAM standalone simulation, 1 degree
Use 1850 aerosol, greenhouse gases and SSTs
w/ obs
w/ b40_1850_1d_b08c5cn_138j


cam5_0_39_1d_u265 CAM standalone simulation, 1 degree
Use 2000 aerosol, greenhouse gases and SSTs

w/ obs
w/ cam5_0_39_1d_1850_u266


cam5_0_40_1d_pia_u267 CAM standalone simulation, 1 degree
Use 2000 greenhouse gases and SSTs
+ pre-industrial aerosol

w/ obs
w/ cam5_0_39_1d_u265

Traditional way to compute AIE:
Indirect effect is deduced by comparing
cam5_0_39_1d_u265 and cam5_0_40_1d_pia_u267
dSWCF: - W/m2
dLWCF: W/m2
dFSNTC: -W/m2
dFLNTC:- W/m2

cam5_0_39_1d_1850_pda_u266 CAM standalone simulation, 1 degree
Use: 1850 greenhouse gases and 1850 SSTs
+ present day aerosol
w/ obs
w/ cam5_0_39_1d_1850_u266

Indirect effect can be deduced by comparing
cam5_0_39_1d_1850_u266 and cam5_0_39_1d_1850_pda_u266
dSWCF: -1.77 W/m2
dLWCF: 0.6 W/m2
dFSNTC: -0.28 W/m2
dFLNTC: -0.10 W/m2

cam5_0_39_1d_1850_u265 CAM standalone simulation, 1 degree
Use 1850 aerosol and greenhouse gases
+ present day SSTs
w/ obs
w/ cam5_0_39_1d_1850_u266


 

Coupled simulation

Casename
Description
Diagnostics
Comments
b40_1850_1d_b08c5cn_138j

1850 control
year 194: rhminl = 0.90->0.8975

RESTOM
TS

w/ obs (yr 11-30)

w/ obs (yr 31-50)
w/ obs (yr 50-69)
w/ obs (yr 120-139)
w/ obs (yr 200-209) - rhminl =0.8975


rhminl = .8975 vs0.90

w/ b40_1850_1d_b08c5cn_137j

w/ b40.1850.track1.1deg.006
w/ b40_1850_c02c_76jpf

nino3.4

nino3


b40_20th_1d_b08c5cn_138j

20th century simulation

RESTOM
TS

w/ obs
w/ b40_1850_1d_b08c5cn_138j

nino3
nino3.4


b40_20th_1d_b08c5cn_139jp

20th century simulation

RESTOM
TS

w/ obs
w/ b40_1850_1d_b08c5cn_138j

nino3
nino3.4


 

 

SOM simulation

Casename
Description
Diagnostics
Comments
e40_1850_1d_b08c5cn_138f SOM run
Hybrid from b40_1850_1d_b08c5cn_138j at year 232
q fluxes computed over period 182-231
RESTOM
TS
w/ b40_1850_1d_b08c5cn_138j

This year is the "spin up" of the SOM runs
All the other runs are started from the end of this run (year 22)

e40_1850_1d_b08c5cn_140f SOM run - 1XCO2
Hybrid from e40_1850_1d_b08c5cn_138f at year 22
RESTOM
TS


e40_1850_2co2_1d_b08c5cn_141f SOM run - 2XCO2
Hybrid from e40_1850_1d_b08c5cn_138f at year 22
RESTOM
TS
w/ e40_1850_1d_b08c5cn_140f


e40_1850_pda_1d_b08c5cn_142f SOM run - 1XCO2 + present day aerosol
Hybrid from e40_1850_1d_b08c5cn_138f at year 22
RESTOM
TS
w/ e40_1850_1d_b08c5cn_140f


e40_1850_2co2pda_1d_b08c5cn_143f SOM run - 2XCO2 + present day aerosol
Hybrid from e40_1850_1d_b08c5cn_138f at year 22
RESTOM
TS
w/ e40_1850_1d_b08c5cn_140f


 


 

3. Simulation with CAM5 - 2 degree

 

CAM standalone

Casename
Description
Diagnostics
Comments
cam5_0_17_u255 CAM5.0 release (before bugfixes and retunings)

w/ obs


cam5_0_39_u265 CAM standalone simulation, 2 degree (using 1 degree tunings)
Use 2000 aerosol, greenhouse gases and SSTs

w/ obs
w/ cam5_0_17_u255
w/ cam5_0_39_1d_u265


cam5_0_40_pia_u268 CAM standalone simulation, 2 degree (using 1 degree tunings)
Use 2000 greenhouse gases and SSTs
+ pre-industrial aerosl

w/ cam5_0_39_u265

compute AIE

Coupled simulation

Casename
Description
Diagnostics
Comments
b40_1850_2d_b16c5cn_140jp Use tunings from 1 degree run (as in 138j)

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j

buggy version of the model

b40_1850_2d_b16c5cn_142jp Same as b40_1850_2d_b16c5cn_140jp
+ Dcs = 400->325

RESTOM
TS
w /obs
w/ b40_1850_2d_b16c5cn_140jp

w/ b40_1850_1d_b08c5cn_138j

too large impact in the high latitude

 

buggy version of the model

b40_1850_2d_b16c5cn_144jp Same as b40_1850_2d_b16c5cn_140jp
+ rhminl = 0.8975->0.88

RESTOM
TS
w/ obs
w/ b40_1850_2d_b16c5cn_140jp
w/ b40_1850_1d_b08c5cn_138j

too large impact over teh tropics

buggy version of the model

b40_1850_2d_b16c5cn_145jp Same as b40_1850_2d_b16c5cn_140jp
+ rpen=10->5
RESTOM
TS
w/ obs
w/ b40_1850_2d_b16c5cn_140jp
w/ b40_1850_1d_b08c5cn_138j

buggy version of the model

b40_1850_2d_b16c5cn_146jp Same as b40_1850_2d_b16c5cn_140jp
+ rpen=10->3
w/ obs
w/ b40_1850_2d_b16c5cn_140jp
w/ b40_1850_1d_b08c5cn_138j

buggy version of the model

b40_1850_2d_b16c5cn_147jp Same as b40_1850_2d_b16c5cn_140jp
+ rpen=10->7

RESTOM
TS
w/ obs
w/ b40_1850_2d_b16c5cn_140jp
w/ b40_1850_1d_b08c5cn_138j

buggy version of the model

b40_1850_2d_b16c5cn_149jp Same as b40_1850_2d_b16c5cn_140jp
but start as an hybrid from CAM5.0 + using land IC from CAM5.1

RESTOM
TS

w/ obs
w/ b40_1850_2d_b16c5cn_140jp
w/ b40_1850_1d_b08c5cn_138j

buggy version of the model

b40_1850_2d_b18c5cn_151jp

Use tunings from 1 degree run (as in 138j)
Start from a CAM5 run excpet for the land IC that was taken from 138j and interpolated on a 2 degree grid

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j


b40_1850_2d_b18c5cn_152jp

Same as b40_1850_2d_b18c5cn_151jp
+rhminl=0.8975->0.88
Hybrid run 151jp at year 7

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j
w/ b40_1850_2d_b18c5cn_151jp


b40_1850_2d_b18c5cn_153jp

Same as b40_1850_2d_b18c5cn_151jp
+Dcs = 400->325 microns
Hybrid run 151jp at year 7

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j
w/ b40_1850_2d_b18c5cn_151jp


b40_1850_2d_b18c5cn_154jp

Same as b40_1850_2d_b18c5cn_151jp
+rpen = 10->5
Hybrid run 151jp at year 7

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j

w/ b40_1850_2d_b18c5cn_151jp


b40_1850_2d_b18c5cn_155jp

Same as b40_1850_2d_b18c5cn_154jp
+rhminl=0.8975->0.885
Hybrid run 154jp at year 28 1

RESTOM
TS
w /obs
w/ b40_1850_1d_b08c5cn_138j

w/ b40_1850_2d_b18c5cn_154jp


b40_1850_2d_b18c5cn_156jp

Same as b40_1850_2d_b18c5cn_154jp
+rhminl=0.8975->0.8875
Hybrid run 154jp at year 28

RESTOM
TS
nino3.4
nino3

w /obs

w/ b40_1850_1d_b08c5cn_138j
w/ b40_1850_2d_b18c5cn_154jp
w/ b40.1850.track1.1deg.006