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Update on the CAM family
CAM3 CAM4 CAM5
Cécile Hannay and Rich Neale (AMP)
Thanks to: Gohkan Danabasoglu, Peter Gent, Alice Bertini, Andrew Gettelman, Dave Bailey.
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
New development
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
New development • Prognostic precipitation (MG2) • New ice nucleation • MAM4 (primary carbon mode) • 32-level model • Modifications to the dust • New optical properties • New energy formulation • Change FV vertical remapping • Consistent topography files for FV • Add “capability” to do prognostic
stratospheric volcanic sulfate (Change mode widths + mode exchange)
• CLUBB • UNICON
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
CAM5.4
June 2015
UW
UW
ZM
MG2
Park
RRTMG
MAM4
FV
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
CAM5.5
2015 UW
UNICON
UNICON
MG2
Park
RRTMG
MAM4
FV
CAM5.5
2015 CLUBB
CLUBB
ZM
MG2
CLUBB
RRTMG
MAM4
FV
CAM5.4
June 2015
UW
UW
ZM
MG2
Park
RRTMG
MAM4
FV
The CAM family
= New parameterization/dynamics
Model CAM4 CCSM4
CAM5.1 CESM1.0.3
CAM5.3 CESM1.2.0
Release Apr 2010 June 2011 June 2013 PBL HB UW UW
Shallow conv. Hack UW UW
Deep conv. ZM ZM ZM
Microphysics RK MG MG
Macrophysics RK Park Park
Radiation CAMRT RRTMG RRTMG
Aerosols BAM MAM3 MAM3
Dynamics FV FV SE
CAM5.5
2015 UW
UNICON
UNICON
MG2
Park
RRTMG
MAM4
FV
CAM5.5
2015 CLUBB
CLUBB
ZM
MG2
CLUBB
RRTMG
MAM4
FV
CAM5.4
June 2015
UW
UW
ZM
MG2
Park
RRTMG
MAM4
FV
CESM-CAM5.4: Initial results • Coupled run started from Large Ensemble at year 402 • 70-year simulation (and counting)
TS stabilizes after 40 yrs RESTOM ~ -0.1 W/m2
CESM-CAM5.4 versus large-ensemble
Obs Large-ens CAM5.4
SWCF (W/m2) -47.1(*) -48.4 -50.9
LWCF (W/m2) 26.0 (*) 22.7 25.8
Precipitable H20 (mm) 24.6 (*) 23.6 24.4
SST (Celsius) 20.3 (**) 19.8 19.7
AODVIS - 0.106 0.139
Global means
(*) = present day value (**) pre-industrial value
better worst
SWCF (W/m2)
CAM5.4 Large-ensemble
Model
Obs
DJF
Large-ensemble gets “good SWCF” for the “wrong reason”
DJF
Model
Obs
LWCF biases (W/m2) Mean = -3.71 ; RMSE=6.52
Large ensemble
CAM5.4
Mean = -0.31 ; RMSE=5.91
CAM5.4 gets “good LWCF” for the “wrong reason”
SSTs biases (K) Mean = -0.24 ; RMSE=0.91
Large ensemble
CAM5.4
Mean =-0.35; RMSE=0.99
CAM5.4 is slightly colder (0.1K)
Surface stresses (N/m2)
CAM5.4: Increased surface stresses amplitude
CAM5.4 Large-ensemble
RMSE Bias
Large-ens 0.78 1.46
CAM5.4 0.75 1.08
Taylor diagrams
Nino3.4 CAM5.4 Large-ensemble
Ice thickness (meters) Large-ensemble
• Sea-ice is thinner than in large ensemble
• Maybe a concern for 20th century • Increase albedo ?
Difference
CAM5.4
Sea Surface salinity (compared to Levitus)
Large-ensemble
Reduced salinity
CAM5.4
Ocean Mixed Layer Depth
CAM5.4 – Large ensemble
Increased Mixed Layer Depth (good !)
NB: likely for the wrong reason (colder SSTs + stronger surface stresses)
Decreased Mixed Layer Depth (bad !)
Summary: Initial results for CESM-CAM5.4
Compared to the large-ensemble,
CESM CAM5.4 shows:
• Slightly colder SSTs
• Cloud forcing: locally better and locally worst
• Slightly better Taylor diagrams
• Increased surface stresses amplitude
• Nino3.4: Very large amplitude
• Increased mixed layer depth in Southern ocean
• Thinner sea-ice (change albedo?)
Thanks
Nino3.4: Observations