source: TI01-discovery/trunk/schema/numsim/NMM/higem/HiGEM_HADGEM_6.1_control.xml @ 1149

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/TI01-discovery/trunk/schema/numsim/NMM/higem/HiGEM_HADGEM_6.1_control.xml@1149
Revision 1149, 15.1 KB checked in by hearnsha, 14 years ago (diff)

Updated with friday afternoon changes

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1<?xml version="1.0" encoding="UTF-8"?>
2<NS_Simulated xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3    xmlns:xlink="http://www.w3.org/1999/xlink" xsi:noNamespaceSchemaLocation="../../NumSim.xsd">
4    <!-- Note that this is a handcoded example XML file which should not be regarded as
5        authoratative about the Higem control run, Charlotte Pascoe, May 2006 -->
6    <NS_CodeBase>
7        <NS_Description>This is the HiGEM codebase</NS_Description>
8        <NS_Model>
9            <NS_Name>HiGEM V6.1 Control (xbpjt)</NS_Name>
10            <NS_Category>GCM</NS_Category>
11            <NS_RelatedModel
12                xlink:href="http://www.higem.nerc.ac.uk/"
13                xlink:title="HiGEM">
14                <NS_Relationship>This is the first HiGEM climate run </NS_Relationship>
15            </NS_RelatedModel>
16            <NS_References>
17                <NS_Reference>http://www2.met-office.gov.uk/research/nwp/publications/papers/unified_model/umdp15_v6.0.pdf</NS_Reference>
18            </NS_References>
19            <NS_Component><!-- ATMOSPHERE -->
20                <NS_Name>Atmosphere</NS_Name>
21                <NS_ComponentType>Atmosphere</NS_ComponentType>
22                <NS_Description><!-- SPACE AND TIME -->
23                    The atmospheric component of HiGEM has 38 vertical levels
24                    with a horizontal resolution of 1.25 degrees of latitude by 0.83 degrees of longitude,
25                    which produces a global grid of 288 x 217 grid cells. This is equivalent to a surface
26                    resolution of about 139 km x 92 km at the Equator, reducing to 98 km x 92 km
27                    at 45 degrees of latitude (comparable to a spectral resolution of Nblah).
28                    The atmospheric timestep period is 20 minutes (72 timesteps per 1 days).
29                </NS_Description>               
30                <NS_Component><!-- Radiation Scheme -->
31                    <NS_Name>Radiation Scheme</NS_Name>
32                    <NS_Description> 
33                        A general 2-stream radiation code including cloud microphysics.
34                        The radiation scheme uses 6 spectral bands in the solar (shortwave) wavelenths
35                        and 9 bands in the terrestrial thermal (longwave) wavelengths.
36                        The radiative effects of CO2 and ozone are explicitly represented as well as oxygen, methane, N2O, CFC-11 and CFC-12.
37                        The LW and SW radiative effects of climatological distributions of sulphate, seasalt, soot and biomass aerosols are included.
38                        A cloud area parameterisation produces an Area Cloud Fraction which replaces the bulk value used in the radiation code.
39                        Mixed phase clouds containing both ice and water are segregated into separate sub-clouds for radiation calculations.
40                    </NS_Description>
41                    <NS_References>
42                        <NS_Reference>
43                            JM Edwards, Slingo A, 1996: Studies with a flexible new radiation code. 1. Choosing a configuration for a large-scale model
44                      QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, 122(531) 689-719
45                        </NS_Reference>
46                    </NS_References>
47                </NS_Component>
48                <NS_Component><!-- Land Surface Scheme -->
49                    <NS_Name>Land Surface Scheme</NS_Name>
50                    <NS_ComponentType>LandSurface</NS_ComponentType>
51                    <NS_Description>
52                        The surface albedo is a function of snow depth and the temperature of the snow over sea ice.
53                        The surface hydrology uses the MOSES-II (Met Office Surface Exchange Scheme).
54                        The vegetation distribution is fixed.
55                        Using coastal tiling allows both land and sea to co-exist in the same gridbox.
56                        There are 9 land surface tiles per grid cell.
57                    </NS_Description>
58                    <NS_References>
59                        <NS_Reference>
60                            JA. CURRY, SCHRAMM JL, EBERT EE: 1995: SEA-ICE ALBEDO CLIMATE FEEDBACK MECHANISM.
61                            JOURNAL OF CLIMATE 8 (2): 240-247
62                        </NS_Reference>
63                    </NS_References>
64                </NS_Component>
65                <NS_Component><!-- Boundary Layer Scheme -->
66                    <NS_Name>Boundary Layer Scheme</NS_Name>
67                    <NS_ComponentType>Atmosphere</NS_ComponentType>
68                    <NS_Description>
69                        The boundary layer scheme explicitly parameterises the top-of-mixed-layer entrainment.
70                        It uses a formulation of the surface exchange coefficients based directly on Monin-Obukhov stability functions.
71                        It uses a subgrid diagnosis of cloud-base height in order to improve the accuracy of the buoyancy flux integral
72                        which is used to diagnose the depth of mixing in stratocumulus clouds.                                       
73                        The boundary layer scheme splits the radiative heating increments into separate LW and SW contributions. 
74                        It uses a Richardson number based mixing scheme and orographic roughness fields.
75                        The scheme accounts for the radiative coupling and the thermal capacity of the vegetation canopy.
76                    </NS_Description>
77                    <NS_References>
78                        <NS_Reference>Lock, A. P. 2001: The numerical representation of entrainment in parametrizations of boundary layer turbulent mixing.
79                            MWR, 129, 1148-1163
80                        </NS_Reference>
81                        <NS_Reference>Lock, A. P., A. R. Brown, M. R. Bush, G. M. Martin, R. N. B. Smith et al. 2000:
82                            A new boundary layer mixing scheme. Part I: scheme description and SCM tests. MWR, 128, 3187-3199
83                        </NS_Reference>
84                    </NS_References>
85                </NS_Component>
86                <NS_Component><!-- Convection Scheme -->
87                    <NS_Name>Convection Scheme</NS_Name>
88                    <NS_ComponentType>Atmosphere</NS_ComponentType>
89                    <NS_Description>
90                        Convection is able to transport momentum in the vertical.
91                        The inital convective plume mass flux is determined by a CAPE based clousure scheme.
92                        The radiative representation of anvils modifies the convective cloud amount (CCA) to vary with height during deep convection.
93                        Excluding precipitation from the water path means that the radiation scheme does not 'see' the convective rain and snow.
94                        The accurate treatment of precipitation phase change ensures that precipitation does not change phase if the associated latent
95                        cooling would take the temperature below the freezing point again.
96                    </NS_Description>
97                    <NS_References>
98                        <NS_Reference></NS_Reference>
99                        <NS_Reference></NS_Reference>
100                    </NS_References>
101                </NS_Component>
102                <NS_Component><!-- Gravity Wave Scheme -->
103                    <NS_Name>Gravity Wave Scheme</NS_Name>
104                    <NS_ComponentType>Atmosphere</NS_ComponentType>
105                    <NS_Description>
106                        The orographic gravitity wave scheme also includes flow blocking.
107                        The gravity wave constant is 1.00e+05 and defines the magnitude of the parametrized response.
108                        The critical Froude number is 4.00 and determines the proportion of that drag attributed to flow blocking and gravity wave drag respectively.
109                        The spectral gravity wave scheme is not used.
110                    </NS_Description>
111                    <NS_References>
112                        <NS_Reference>Webster S., A.R. Brown, D.R. Cameron and C.P. Jones, 2003:
113                            Improvements to the Representation of Orography in the Met Office Unified Model.
114                            Quarterly Journal of the Royal Meteorological Society, 129 (591): 1989-2010 Part B.
115                        </NS_Reference>
116                    </NS_References>
117                </NS_Component>
118                <NS_Component><!-- Precipitation and Cloud Scheme -->
119                    <NS_Name>Precipitation and Cloud Scheme</NS_Name>
120                    <NS_ComponentType>Atmosphere</NS_ComponentType>
121                    <NS_Description> The large scale precipitation scheme contains a full microphysical calculation of the cloud phase and
122                        generation of precipitation with water vapour, cloud liquid water and ice particle content as prognostic variables.
123                        Microphysical processes are treated as transfer terms between water vapour, liquid, ice, and rain.
124                        The fraction of cloud ice content that is pristine ice crystals and snow aggregate particles are treated
125                        seperately in the microphysical transfer terms.     
126                        Condensation can occur before grid scale supersaturation and the vapour is condensed to cloud water.
127                        The conversion from vapour to liquid or frozen cloud water is reversible.
128                        A RHcrit parametrization causes the cloud scheme to use 3D diagnosed critical relative humidity.
129                        A cloud area parametrization produces an Area Cloud Fraction which replaces the Bulk value in much of the radiation code.
130                    </NS_Description>
131                    <NS_References>
132                        <NS_Reference>Wood et al. ,2002: Atmos. Res., 65, 109-128</NS_Reference>
133                        <NS_Reference>http://cgam.nerc.ac.uk/dev/um/docs/UM45_sci/p026.pdf</NS_Reference>
134                        <NS_Reference>http://cgam.nerc.ac.uk/dev/um/docs/UM45_sci/p029.pdf</NS_Reference>
135                     </NS_References>
136                </NS_Component>
137                <NS_Component><!-- Advection and Diffusion -->
138                    <NS_Name>Advection and Diffusion</NS_Name>
139                    <NS_ComponentType>Atmosphere</NS_ComponentType>
140                    <NS_Description>
141                        A semi-lagrangian advection scheme is used.
142                        The advection of potential temperature, moisture, density and winds are treated separately.
143                        Moisture is conserved using a non-hydrostatic scheme.
144                        A conservative horizontal diffusion scheme is used.
145                        Vertical diffusion is switched off.
146                    </NS_Description>
147                    <NS_References>
148                        <NS_Reference>
149                            http://www2.met-office.gov.uk/research/nwp/publications/papers/unified_model/umdp15_v6.0.pdf
150                        </NS_Reference>
151                    </NS_References>
152                </NS_Component>
153                <NS_Component><!-- Aerosols -->
154                    <NS_Name>Aerosols</NS_Name>
155                    <NS_ComponentType>Atmosphere</NS_ComponentType>
156                    <NS_Description>
157                        The aerosol parameterisation includes a sulphur cycle, soot scheme and biomass aerosol scheme.
158                        The sulphur cycle includes SO2 emissions from the surface, chimneys and volcanoes.
159                        The sulphur cycle also uses an interactive dimethyl sulphide scheme.
160                        The biomass scheme includes emissions from the surface and from high levels.
161                    </NS_Description>
162                </NS_Component>
163                <NS_Component><!-- Rivers -->
164                    <NS_Name>Rivers</NS_Name>
165                    <NS_ComponentType>LandSurface</NS_ComponentType>
166                    <NS_Description>
167                        All rivers flow with an effective velocity of 0.4 m/s and a meander ratio of 1.4.
168                        River outflow to the ocean is included.
169                    </NS_Description>
170                </NS_Component>
171            </NS_Component>
172            <!-- OCEAN -->
173            <NS_Component>
174                <NS_Name>Ocean</NS_Name>
175                <NS_ComponentType>Ocean</NS_ComponentType>
176                <NS_Description><!-- SPACE AND TIME -->
177                    The oceanic component of HiGEM has 40 vertical levels with
178                    a horizontal resolution of 0.333 degrees of latitude by 0.333 degrees of longitude,
179                    which produces a global grid of 1082 x 540 grid cells. This is equivalent to a surface
180                    resolution of about 37 km x 37 km at the Equator, reducing to 26 km x 37 km
181                    at 45 degrees of latitude (comparable to a spectral resolution of Nblah).
182                    The atmospheric timestep period is 20 minutes (72 timesteps per 1 days).   
183                    The ocean GCM includes a polar island as standard.
184                </NS_Description>
185                <NS_References>
186                    <NS_Reference></NS_Reference>
187                </NS_References>
188                <NS_Component>
189                    <NS_Name>Filtering</NS_Name>
190                    <NS_ComponentType>Ocean</NS_ComponentType>
191                    <NS_Description>
192                        Fourier filtering is used to decrease the effective resolution of the model at
193high latitudes, allowing a longer timestep to be used. See UMDP 40. Different
194filtered regions can be chosen for tracers and velocity and for the northern
195and southern hemispheres. In the northern hemisphere, filtering starts at
196'First tracer/velocity row in northern hemisphere to be filtered' and goes
197right up to the north pole. The filtering removes scales less than the grid
198scale on the row defined by 'Tracer/velocity row used to define basic zonal
199dimension'. The equator-most row to be filtered in each hemisphere determines
200the minimum effective gridlength retained by the filtering.
201                    </NS_Description>
202                    <NS_References></NS_References>
203                </NS_Component>
204               
205            </NS_Component>
206            <NS_Component>
207                <NS_Name>Sea Ice</NS_Name>
208                <NS_ComponentType>Cryosphere</NS_ComponentType>
209                <NS_Description> </NS_Description>
210                <NS_References>
211                    <NS_Reference> </NS_Reference>
212                </NS_References>
213            </NS_Component>
214            <NS_Component>
215                <NS_Name>Atmos-Ocean Coupler</NS_Name>
216                <NS_ComponentType>Coupler</NS_ComponentType>
217                <NS_Description> </NS_Description>
218            </NS_Component>
219        </NS_Model>
220    </NS_CodeBase>
221    <NS_Experiment>
222        <NS_Description></NS_Description>
223        <NS_BoundaryCondition NS_Type="Present Day">
224            <NS_Description></NS_Description>
225        </NS_BoundaryCondition>
226        <NS_InitialCondition NS_Type="Unknown">
227            <NS_Description></NS_Description>
228        </NS_InitialCondition>
229    </NS_Experiment>
230</NS_Simulated>
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