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