**Model Information of Potential Use to the IPCC Lead Authors and the
AR4**

**BCC-CM1**

20 December, 2005

# Model identity:

A.  Institution, sponsoring agency, country

Beijing Climate Center, National Climate Center, China Meteorological
Administration, No.46, S.Road, Zhongguancun Str., Beijing 100081, China

B.  Model name (and names of component atmospheric, ocean, sea ice, etc.
    models)

Name of the coupled GCM: BCC-CM1

Name of AGCM: BCC T63

Name of OGCM: IAP T63

Name of sea ice model: thermodynamic

Name of land model: NCC/BATS/Sun snow

C.  Vintage (i.e., year that model version was first used in a published
    application)

**2000**

D.  General published references and web pages

Ding, Yihui, Yunqi Ni, Xuehong Zhang, Weijing Li, Min Dong, Zong-Ci
Zhao, Zechun Li, Wenhai Shen eds., 2000, Introduction to the short-term
climate prediction model system, China Meteorological Press, Beijing,
China, 500pp in Chinese;

Climate System Modeling Division (CSMD), 2005, An introduction to The
Fist-generation Operational Climate Model at National Climate Center,
Advances in Climate System Modeling, 1, 14pp, in both Chinese and
English;

<http://ncc.cma.gov.cn/english>

E.  References that document changes over the last \~5 years (i.e.,
    since the IPCC TAR) in the coupled model or its components. We are
    specifically looking for references that document changes in some
    aspect(s) of model performance.

Dong, M. ed., 2001, Introduction to National Climate Center Atmospheric
general Circulation Model documentation -- basic principles and
applications, China Meteorological Press, 152pp, in Chinese

Ding, Yihui, Ying Xu, Zong-Ci Zhao, Yong Luo and Xuejie Gao, 2004,
Climate change scenarios over east Asia and China in the future 100
years, Climate Change Newsletter 2003/2004, 2-4, in English;

Climate System Modeling Division (CSMD), 2005, An introduction to The
Fist-generation Operational Climate Model at National Climate Center,
Advances in Climate System Modeling, 1, 14pp, in both Chinese and
English;

F.  IPCC model version\'s global climate sensitivity (KW^-1^m^2^) to
    increase in CO~2~ and how it was determined (slab ocean expt.,
    transient expt\--Gregory method, ±2K Cess expt., etc.)

G.  Contacts (name and email addresses), as appropriate, for:

    1.  coupled model (Dr. Ying Xu, xuying@cma.gov.cn)

    2.  atmosphere (Dr. Ying Xu, xuying@cma.gov.cn)

    3.  ocean (Dr. Yongqiang Yu, <yyq@lasg.iap.ac.cn> )

    4.  sea ice (Dr. Ying Xu, xuying@cma.gov.cn)

    5.  land surface (Dr. Yong Luo, yluo@cma.gov.cn)

    6.  vegetation (Dr. Xuejie Gao, gaox@cma.gov.cn)

    7.  other?

# Besides atmosphere, ocean, sea ice, and prescription of land/vegetated surface, what can be included (interactively) and was it active in the model version that produced output stored in the PCMDI database?

A.  atmospheric chemistry? *No.*

B.  interactive biogeochemistry? *No**.***

C.  what aerosols and are indirect effects modeled? *Sulfate aerosols*.

D.  dynamic vegetation? *No**.***

E.  ice-sheets? *No***.**

# List the community based projects (e.g., AMIP, C4MIP, PMIP, PILPS, etc.) that your modeling group has participated in and indicate if your model results from each project should carry over to the current (IPCC) version of your model in the PCMDI database.

> *Coupled GCM: CMIP2, 20C3M*
>
> *AGCM: EAMIP*

# Component model characteristics (of current IPCC model version):

A.  Atmosphere *(Dong, M. ed., 2001, Introduction to National Climate
    Center Atmospheric general Circulation Model documentation -- basic
    principles and applications, China Meteorological Press, 152pp, in
    Chinese)*

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1.  resolution:

> *T63 (1.875lon x 1.875lat), L16*

2.  numerical scheme/grid (advective and time-stepping schemes; model
    top; vertical coordinate and number of layers above 200 hPa and
    below 850 hPa)

> *model top at 25hPa, hybrid P-σ coordinates (E-ta), There are 8 layers
> above 200hPa and 3 layers below 850hPa. reference-atmospheric scheme,
> mass-conservation scheme, improved semi-Lagrange method, Morcrette
> Scheme and k-distributive parameterization scheme, Gregory mass flux
> scheme, finite difference method, a semi-implicit time-stepping
> scheme*

3.  list of prognostic variables (be sure to include, as appropriate,
    liquid water, chemical species, ice, etc.). Model output variable
    names are not needed, just a generic descriptive name (e.g.,
    temperature, northward and eastward wind components, etc.)

> *Temperature, northward and eastward wind components, surface
> pressure, specific humidity, ice water, liquid water*

4.  name, terse descriptions, and references (journal articles, web
    pages) for all major parameterizations. Include, as appropriate,
    descriptions of:

    a.  clouds

> *NEW-ECMWF (Simpson, JAS, 1971, 449-455; Morcrette, JGR, 1991, 96, D5,
> 9121-9132; Shen et al., 2000; Sang, 2000; Dong and Ping, 2001)*

b.  Convection

> *Improved Gregory scheme (Gregory and Rowntree, 1990, MWR, July; Ping
> et al., 2000)*

c.  boundary layer

> *boundary layer (Sang, 2000), snow (Sun and Jin, 2000)*

d.  SW, LW radiation

> *NEW/ECMWF1989 (Morcrette, JGR, 1991, 96, D5, 9121-9132; Shen et al.,
> 2000)*

e.  Any special handling of wind and temperature at top of model

> *The vertical velocity is set to be zero at top of model.*

B.  Ocean *(Zhang et al., 2000, Introduction to Oceanic General
    Circulation Model Technic Report, 120pp, in Chinese; Zhang, X.-H.,
    G.Y.Shi, H.Liu, and Y.Q.Yu, 2000, IAP* Global Ocean-Atmosphere-Land
    System Model, Beijing, Science Press, in English)

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1.  resolution

> *L30, 1.875oX1.875o*

2.  numerical scheme/grid, including advection scheme, time-stepping
    scheme, vertical coordinate, free surface or rigid lid, virtual salt
    flux or freshwater flux

> *Uniform longitude-latitude grid without shift poles.*
>
> *Leap-frog time integration scheme.*
>
> *Free surface.*
>
> *Eta vertical coordinate.*
>
> *Freshwater flux.*

3.  list of prognostic variables and tracers

> *Sea surface height, temperature, salinity, horizontal velocity*

4.  name, terse descriptions, and references (journal articles, web
    pages) for all parameterizations. Include, as appropriate,
    descriptions of:

> a.       eddy parameterization
>
> *GM90 scheme from MOM2 (Gent, P.R., McWilliams, J.C., 1990. Isopycnal
> mixing in ocean circulation models. Journal of Physical Oceanography,
> 20, 150-155.)*
>
> b.      bottom boundary layer treatment and/or sill overflow treatment
>
> *No*
>
> c.       mixed-layer treatment
>
> *PP scheme within 30S-30N (Pacanowski, R.C., Philander, G., 1981.
> Parametrization of vertical mixing in numerical models of the tropical
> ocean. Journal of Physical Oceanography 11, 1442-1451.)*
>
> *vertical mixing is treated as a constant outside the tropic area.*
>
> d.      sunlight penetration
>
> *MOM2\'s method described by Rosati, A and K., Miyakoda(1988, J. Phys.
> Oceanogr., 18, 1601-1626.)*
>
> e.       tidal mixing
>
> *No*
>
> f.        river mouth mixing
>
> *No*
>
> g.       mixing isolated seas with the ocean
>
> *No*
>
> h.       treatment of North Pole \"singularity\" (filtering, pole
> rotation, artificial island?)
>
> *Filtering with a artificial island at the polar.*

C.  sea ice

> *thermodynamic sea ice*

1.  horizontal resolution, number of layers, number of thickness
    categories

2.  numerical scheme/grid, including advection scheme, time-stepping
    scheme,

3.  list of prognostic variables

4.  completeness

5.  treatment of salinity in ice

6.  brine rejection treatment

7.  treatment of the North Pole \"singularity\" (filtering, pole
    rotation, artificial island?)

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D.  land / ice sheets (some of the following may be omitted if
    information is clearly included in cited references. *(Sun and Jin,
    2000; Dong, M. ed., 2001, Introduction to National Climate Center
    Atmospheric general Circulation Model documentation -- basic
    principles and applications, China Meteorological Press, 152pp, in
    Chinese; CSMD, 2005 in both English and Chinese)*

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1.  resolution (tiling?), number of layers for heat and water

2.  treatment of frozen soil and permafrost

3.  treatment of surface runoff and river routing scheme

4.  treatment of snow cover on land

5.  description of water storage model and drainage

6.  surface albedo scheme

7.  vegetation treatment (canopy?)

8.  list of prognostic variables

9.  ice sheet characteristics (How are snow cover, ice melting, ice
    accumulation, ice dynamics handled? How are the heat and water
    fluxes handled when the ice sheet is melting?)

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E.  coupling details *(Zhang et al., 2000, Introduction to Oceanic
    General Circulation Model Technic Report, 120pp, in Chinese)*

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1.  frequency of coupling

*One day for oceanic model and one hour for atmospheric, land and sea
ice models.*

2.  Are heat and water conserved by coupling scheme?

*No.*

3.  list of variables passed between components:

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a.  atmosphere -- ocean

b.  atmosphere -- land

c.  land -- ocean

d.  sea ice -- ocean

e.  sea ice -- atmosphere

*a,b,c,d,e*

4.  Flux adjustment? (heat?, water?, momentum?, annual?, monthly?).

*Heat and momentum adjustment*

# Simulation Details (report separately for each IPCC simulation contributed to database at PCMDI):

A.  IPCC \"experiment\" name

B.  Describe method used to obtain initial conditions for each component
    model

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1.  If initialized from a control run, which month/year.

2.  For control runs, describe spin-up procedure.

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C.  For pre-industrial and present-day control runs, describe radiative
    forcing agents (e.g., non-anthropogenic aerosols, solar variability)
    present. Provide references or web pages containing further
    information as to the distribution and temporal changes in these
    agents.

D.  For perturbation runs, describe radiative forcing agents (e.g.,
    which greenhouse gases, which aerosols, ozone, land surface changes,
    etc.) present. Provide references or web pages containing further
    information as to the distribution and temporal changes in these
    agents.

*A. PDcntrl*

*B. Firstly, the each component model is integrated with the observed
climatologically forcing, e.g. 30 model years for atmospheric model, and
3000 model years for OGCM. Secondly, the coupled model was integrated 50
years from the last year of uncoupled model integration, which can be
defined as CGCM spin-up. Finially, the initial condition of the
experiment "PDcntr " is from the last year of the CGCM spin-up
integration in the second step.*

*C. No non-antropogenic aerosols included. Solar constant is 1365
W/M\*M.*

*D. /*

*A. 20C3M*

*B. The initial conditions of 20C3M ensemble simulations are from the
1st in March, Jun, Sep, Dec of year 1870 by atmosphere model,
respectively.*

*C./*

*D. CO2, N2O, CH4, CFC11, CFC12; climatologic mean ozone data from*
<ftp://sprite.llnl.gov/pub/covey/IPCC_4AR_Forcing/>

*A. SRESA2*

*B. The initial conditions of SRESA2 ensemble simulations are from the
1st January of year 1880,it is from control experiments, isn'tt from
experiment 20C3M.*

*C./*

*D. CO2, N2O, CH4, CFC11, CFC12; climatologic mean ozone; data from*
<ftp://sprite.llnl.gov/pub/covey/IPCC_4AR_Forcing/>

*A. SRESB1*

*B. The initial conditions of SRESB1 ensemble simulations are from the
1st January of year 1880,it is from control experiments, isn'tt from
experiment 20C3M.*

*D. CO2, N2O, CH4, CFC11, CFC12; climatologic mean ozone ; data from*
<ftp://sprite.llnl.gov/pub/covey/IPCC_4AR_Forcing/>

*A. 1%to2x*

*B. The initial conditions of 1%to2x ensemble simulations are from the
1st January of model'year 1980.*

*C./*

*D. CO2 increases by 1% per year from 280ppm. The other forcing is same
as PDcntr.*

*A. 1%to4x*

*B. The initial conditions of 1%to4x ensemble simulations are from the
1%to2x*

*C./*

*D. CO2 increases by 1% per year from 560ppm. The other forcing is same
as PDcntr.*

*A. AMIP*

*B. The initial conditions of AMIP ensemble simulations are from the 1st
in March, Jun, Sep, Dec of year 1978 by atmosphere model, respectively.*

*D. CO2, N2O, CH4, CFC11, CFC12; climatologic mean ozone ; data from
<ftp://sprite.llnl.gov/pub/covey/IPCC_4AR_Forcing/>*