The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology
The Community Atmosphere Biosphere Land Exchange (CABLE) model has been coupled to the UK Met Office Unified Model (UM) within the existing framework of the Australian Community Climate and Earth System Simulator (ACCESS), replacing the Met Office Surface Exchange Scheme (MOSES). Here we investigate...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-08-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/9/2771/2016/gmd-9-2771-2016.pdf |
| _version_ | 1811241279942557696 |
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| author | E. A. Kowalczyk L. E. Stevens R. M. Law I. N. Harman M. Dix C. N. Franklin Y.-P. Wang |
| author_facet | E. A. Kowalczyk L. E. Stevens R. M. Law I. N. Harman M. Dix C. N. Franklin Y.-P. Wang |
| author_sort | E. A. Kowalczyk |
| collection | DOAJ |
| description | The Community Atmosphere Biosphere Land Exchange (CABLE) model has
been coupled to the UK Met Office Unified Model (UM) within the existing
framework of the Australian Community Climate and Earth System Simulator
(ACCESS), replacing the Met Office Surface Exchange Scheme (MOSES). Here we
investigate how features of the CABLE model impact on present-day surface
climate using ACCESS atmosphere-only simulations. The main differences
attributed to CABLE include a warmer winter and a cooler summer in the
Northern Hemisphere (NH), earlier NH spring runoff from snowmelt, and smaller
seasonal and diurnal temperature ranges. The cooler NH summer temperatures in
canopy-covered regions are more consistent with observations and are
attributed to two factors. Firstly, CABLE accounts for aerodynamic and
radiative interactions between the canopy and the ground below; this
placement of the canopy above the ground eliminates the need for a separate
bare ground tile in canopy-covered areas. Secondly, CABLE simulates larger
evapotranspiration fluxes and a slightly larger daytime cloud cover fraction.
Warmer NH winter temperatures result from the parameterization of cold
climate processes in CABLE in snow-covered areas. In particular, prognostic
snow density increases through the winter and lowers the diurnally resolved
snow albedo; variable snow thermal conductivity prevents early winter heat
loss but allows more heat to enter the ground as the snow season progresses;
liquid precipitation freezing within the snowpack delays the building of the
snowpack in autumn and accelerates snow melting in spring. Overall we find
that the ACCESS simulation of surface air temperature benefits from the
specific representation of the turbulent transport within and just above the
canopy in the roughness sublayer as well as the more complex snow scheme in
CABLE relative to MOSES. |
| first_indexed | 2024-04-12T13:34:09Z |
| format | Article |
| id | doaj.art-c46dbaa457314a53a2455f19a1fe025d |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-04-12T13:34:09Z |
| publishDate | 2016-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-c46dbaa457314a53a2455f19a1fe025d2022-12-22T03:31:05ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032016-08-01982771279110.5194/gmd-9-2771-2016The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatologyE. A. Kowalczyk0L. E. Stevens1R. M. Law2I. N. Harman3M. Dix4C. N. Franklin5Y.-P. Wang6CSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaCSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaCSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaCSIRO Oceans and Atmosphere, Yarralumla, ACT, 2600, AustraliaCSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaCSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaCSIRO Oceans and Atmosphere, Aspendale, VIC, 3195, AustraliaThe Community Atmosphere Biosphere Land Exchange (CABLE) model has been coupled to the UK Met Office Unified Model (UM) within the existing framework of the Australian Community Climate and Earth System Simulator (ACCESS), replacing the Met Office Surface Exchange Scheme (MOSES). Here we investigate how features of the CABLE model impact on present-day surface climate using ACCESS atmosphere-only simulations. The main differences attributed to CABLE include a warmer winter and a cooler summer in the Northern Hemisphere (NH), earlier NH spring runoff from snowmelt, and smaller seasonal and diurnal temperature ranges. The cooler NH summer temperatures in canopy-covered regions are more consistent with observations and are attributed to two factors. Firstly, CABLE accounts for aerodynamic and radiative interactions between the canopy and the ground below; this placement of the canopy above the ground eliminates the need for a separate bare ground tile in canopy-covered areas. Secondly, CABLE simulates larger evapotranspiration fluxes and a slightly larger daytime cloud cover fraction. Warmer NH winter temperatures result from the parameterization of cold climate processes in CABLE in snow-covered areas. In particular, prognostic snow density increases through the winter and lowers the diurnally resolved snow albedo; variable snow thermal conductivity prevents early winter heat loss but allows more heat to enter the ground as the snow season progresses; liquid precipitation freezing within the snowpack delays the building of the snowpack in autumn and accelerates snow melting in spring. Overall we find that the ACCESS simulation of surface air temperature benefits from the specific representation of the turbulent transport within and just above the canopy in the roughness sublayer as well as the more complex snow scheme in CABLE relative to MOSES.http://www.geosci-model-dev.net/9/2771/2016/gmd-9-2771-2016.pdf |
| spellingShingle | E. A. Kowalczyk L. E. Stevens R. M. Law I. N. Harman M. Dix C. N. Franklin Y.-P. Wang The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology Geoscientific Model Development |
| title | The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology |
| title_full | The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology |
| title_fullStr | The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology |
| title_full_unstemmed | The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology |
| title_short | The impact of changing the land surface scheme in ACCESS(v1.0/1.1) on the surface climatology |
| title_sort | impact of changing the land surface scheme in access v1 0 1 1 on the surface climatology |
| url | http://www.geosci-model-dev.net/9/2771/2016/gmd-9-2771-2016.pdf |
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