Modifications to atmospheric physical parameterisations aimed at improving SST simulations in the ACCESS coupled model

Sun, Zhian; Franklin, Charmaine; Zhou, Xiaobing; Ma, Yanhui; Okely, Patricia; Bi, Daohua; Hirst, Anthony C.; Shonk, Jonathan K. P.; Puri, Kamal

doi:10.22499/2.6301.015

Cited by 8 publications

(11 citation statements)

References 46 publications

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“…This has been demonstrated by Fig. 6 in Sun et al () in which we have shown that the implementation of a new ice cloud fraction scheme (Franklin et al , ) leads to an increase of high‐level cloud fraction in the ACCESS model and results in a reduction of SO warm bias (Fig. 6c vs. 6b in Sun et al, ).…”

Section: Experiments With the Access Modelsupporting

confidence: 69%

“… Land surface scheme: The Community Atmosphere Biosphere Land Exchange (CABLE: Kowalczyk et al , ) replaces the Met Office's Surface Exchange Scheme (MOSES). Radiation: The triple‐cloud scheme (Shonk et al , ) is used to represent the effect of cloud horizontal inhomogeneity on the radiation. Clouds: A modified ice cloud fraction parametrization by Franklin et al () and the area cloud fraction correction scheme described by Boutle and Morcrette () have been used. Boundary layer: A modified air–sea flux exchange scheme (Sun et al , ) has been used. …”

Section: Methodsmentioning

confidence: 99%

“…These modifications have been applied to experiments in the Coupled Model experiments (CMIP) but not in the Atmospheric Model only (AMIP) and NWP simulations. It should be noted that although these changes have led to certain improvements in the ACCESS coupled model simulations in the Northern Hemisphere and Tropics, the SO warm bias is not improved (Sun et al , ). Although the model versions used in NWP and climate simulations are different, the problem of warm biases in the SO region exists in all these models.…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products

Luo

Sun

Zheng

et al. 2015

Quart J Royal Meteoro Soc

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Radiation field and cloud properties over the Southern Ocean area generated by the Australian Community Climate and Earth System Simulator (ACCESS) are evaluated using multiple‐satellite products from the Fast Longwave And Shortwave radiative Fluxes (FLASHFlux) project and NASA/GEWEX surface radiation budget (SRB) data. The cloud properties are also evaluated using the observational simulator package COSP, a synthetic brightness temperature model (SBTM) and cloud liquid‐water path data (UWisc) from the University of Wisconsin satellite retrievals. All of these evaluations are focused on the Southern Ocean area in an effort to understand the reasons behind the short‐wave radiation biases at the surface. It is found that the model overestimates the high‐level cloud fraction and frequency of occurrence of small ice‐water content and underestimates the middle and low‐level cloud fraction and water content. In order to improve the modelled radiation fields over the Southern Ocean area, two main modifications have been made to the physical schemes in the ACCESS model. Firstly the autoconversion rate at which the cloud water is converted into rain and the accretion rate in the warm rain scheme have been modified, which increases the cloud liquid‐water content in warm cloud layers. Secondly, the scheme which determines the fraction of supercooled liquid water in mixed‐phase clouds in the parametrization of cloud optical properties has been changed to use one derived from CALIPSO data which provides larger liquid cloud fractions and thus higher optical depths than the default scheme. Sensitivity tests of these two schemes in ACCESS climate runs have shown that applying either can lead to a reduction of the solar radiation reaching the surface and reduce the short‐wave radiation biases.

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Section: Experiments With the Access Modelsupporting

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products

Luo

Sun

Zheng

et al. 2015

Quart J Royal Meteoro Soc

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“…A detailed description of this scheme and its evaluation within the ACCESS model are provided by Sun et al (2013). This implementation differs from the simpler scaling scheme implemented in GA1.0 to account for cloud inhomogeneity (Hewitt et al 2011).…”

Section: Access13mentioning

confidence: 99%

The ACCESS coupled model: description, control climate and evaluation

Bi¹,

Dix²,

Marsland³

et al. 2013

Self Cite

440

273

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The Australian Community Climate and Earth System Simulator coupled model (ACCESS-CM) has been developed at the Centre for Australian Weather and Climate Research (CAWCR), a partnership between CSIRO 1 and the Bureau of Meteorology. It is built by coupling the UK Met Office atmospheric unified model (UM), and other sub-models as required, to the ACCESS ocean model, which consists of the NOAA/GFDL 2 ocean model MOM4p1 and the LANL 3 sea-ice model CICE4.1, under the CERFACS 4 OASIS3.2-5 coupling framework. The primary goal of the ACCESS-CM development is to provide the Australian climate community with a new generation fully coupled climate model for climate research, and to participate in phase five of the Coupled Model Inter-comparison Project (CMIP5). This paper describes the ACCESS-CM framework and components, and presents the control climates from two versions of the ACCESS-CM, ACCESS1.0 and AC-CESS1.3, together with some fields from the 20 th century historical experiments, as part of model evaluation. While sharing the same ocean sea-ice model (except different setups for a few parameters), ACCESS1.0 and ACCESS1.3 differ from each other in their atmospheric and land surface components: the former is configured with the UK Met Office HadGEM2 (r1.1) atmospheric physics and the Met Office Surface Exchange Scheme land surface model version 2, and the latter with atmospheric physics similar to the UK Met Office Global Atmosphere 1.0 including modifications performed at CAWCR and the CSIRO Community Atmosphere Biosphere Land Exchange land surface model version 1.8. The global average annual mean surface air temperature across the 500-year preindustrial control integrations show a warming drift of 0.35 °C in ACCESS1.0 and 0.04 °C in AC-CESS1.3. The overall skills of ACCESS-CM in simulating a set of key climatic fields both globally and over Australia significantly surpass those from the preceding CSIRO Mk3.5 model delivered to the previous coupled model inter-comparison. However, ACCESS-CM, like other CMIP5 models, has deficiencies in various aspects, and these are also discussed.

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“…A full evaluation of results presented by Sun et al [14]. Only surface radiation and sea surface temperature (SST) are shown here due to the limit of page length limit.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of a scheme representing cloud inhomogeneous structure in the Australian Community Climate and Earth System Simulator (ACCESS)

Sun¹,

Franklin²,

Zhou³

et al. 2013

AIP Conference Proceedings

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Modifications to atmospheric physical parameterisations aimed at improving SST simulations in the ACCESS coupled model

Cited by 8 publications

References 46 publications

Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products

Evaluation of ACCESS model cloud properties over the Southern Ocean area using multiple‐satellite products

The ACCESS coupled model: description, control climate and evaluation

Evaluation of a scheme representing cloud inhomogeneous structure in the Australian Community Climate and Earth System Simulator (ACCESS)

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