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Volumn 7, Issue 1, 2015, Pages 215-225

Short-term time step convergence in a climate model

Author keywords

climate model; convergence; numerical error; time integration

Indexed keywords

EARTH ATMOSPHERE; EQUATIONS OF MOTION; ERRORS; NUMERICAL MODELS; PARAMETERIZATION; TESTING;

EID: 84928780295     PISSN: None     EISSN: 19422466     Source Type: Journal    
DOI: 10.1002/2014MS000368     Document Type: Article
Times cited : (34)

References (49)
  • 1
    • 0011459187 scopus 로고
    • Difference schemes for multidimensional problems
    • Bagrinovskii, K. A., and, S. K. Godunov, (1957), Difference schemes for multidimensional problems, Dokl. Akad. Nauk SSSR, 115, 431-433.
    • (1957) Dokl. Akad. Nauk SSSR , vol.115 , pp. 431-433
    • Bagrinovskii, K.A.1    Godunov, S.K.2
  • 2
    • 67650512618 scopus 로고    scopus 로고
    • A new moist turbulence parameterization in the Community Atmosphere Model
    • Bretherton, C. S., and, S. Park, (2009), A new moist turbulence parameterization in the Community Atmosphere Model, J. Clim., 22, 3422-3448, doi: 10.1175/2008JCLI2556.1.
    • (2009) J. Clim. , vol.22 , pp. 3422-3448
    • Bretherton, C.S.1    Park, S.2
  • 3
    • 0003644743 scopus 로고    scopus 로고
    • NCAR Tech. Note NCAR/TN-424+STR, Natl. Cent. for Atmos. Res., Boulder, Colo., doi: 10.5065/D6QV3JG3
    • Bryan, F. O., B. G. Kauffman, W. G. Large, and, P. R. Gent, (1996), The NCAR CSM flux coupler, NCAR Tech. Note NCAR/TN-424+STR, Natl. Cent. for Atmos. Res., Boulder, Colo., doi: 10.5065/D6QV3JG3.
    • (1996) The NCAR CSM Flux Coupler
    • Bryan, F.O.1    Kauffman, B.G.2    Large, W.G.3    Gent, P.R.4
  • 5
    • 84923065772 scopus 로고    scopus 로고
    • Advanced two-moment microphysics for global models. Part I: Off-line tests and comparisons with other schemes
    • Gettelman, A., and, H. Morrison, (2014), Advanced two-moment microphysics for global models. Part I: Off-line tests and comparisons with other schemes, J. Clim., doi: 10.1175/JCLI-D-14-00102.1.
    • (2014) J. Clim.
    • Gettelman, A.1    Morrison, H.2
  • 6
    • 52949134806 scopus 로고    scopus 로고
    • A new two-moment bulk stratiform cloud microphysics scheme in the Community Atmosphere Model, version 3 (CAM3). Part II: Single-column and global results
    • Gettelman, A., H. Morrison, and, S. J. Ghan, (2008), A new two-moment bulk stratiform cloud microphysics scheme in the Community Atmosphere Model, version 3 (CAM3). Part II: Single-column and global results, J. Clim., 21, 3660-3679, doi: 10.1175/2008JCLI2116.1.
    • (2008) J. Clim. , vol.21 , pp. 3660-3679
    • Gettelman, A.1    Morrison, H.2    Ghan, S.J.3
  • 7
    • 77957575116 scopus 로고    scopus 로고
    • Global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the Community Atmosphere Model
    • Gettelman, A., X. Liu, S. J. Ghan, H. Morrison, S. Park, A. J. Conley, S. A. Klein, J. Boyle, D. L. Mitchell, and, J.-F. L. Li, (2010), Global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the Community Atmosphere Model, J. Geophys. Res., 115, D18216, doi: 10.1029/2009JD013797.
    • (2010) J. Geophys. Res. , vol.115 , pp. D18216
    • Gettelman, A.1    Liu, X.2    Ghan, S.J.3    Morrison, H.4    Park, S.5    Conley, A.J.6    Klein, S.A.7    Boyle, J.8    Mitchell, D.L.9    Li, J.-F.L.10
  • 8
    • 84885998549 scopus 로고    scopus 로고
    • Microphysical process rates and global aerosol-cloud interactions
    • Gettelman, A., H. Morrison, C. R. Terai, and, R. Wood, (2013), Microphysical process rates and global aerosol-cloud interactions, Atmos. Chem. Phys., 13, 9855-9867, doi: 10.5194/acp-13-9855-2013.
    • (2013) Atmos. Chem. Phys. , vol.13 , pp. 9855-9867
    • Gettelman, A.1    Morrison, H.2    Terai, C.R.3    Wood, R.4
  • 9
    • 84923025690 scopus 로고    scopus 로고
    • Advanced two-moment microphysics for global models. Part II: Global model solutions and aerosol-cloud interactinos
    • Gettelman, A., H. Morrison, S. Santos, P. Bogenschutz, and, P. H. Caldwell, (2014a), Advanced two-moment microphysics for global models. Part II: Global model solutions and aerosol-cloud interactinos, J. Clim., doi: 10.1175/JCLI-D-14-00103.1.
    • (2014) J. Clim.
    • Gettelman, A.1    Morrison, H.2    Santos, S.3    Bogenschutz, P.4    Caldwell, P.H.5
  • 10
    • 84907016682 scopus 로고    scopus 로고
    • Corrigendum to "microphysical process rates and global aerosol-cloud interactions" published in Atmos. Chem. Phys., 13, 9855-9867, 2013
    • Gettelman, A., H. Morrison, C. R. Terai, and, R. Wood, (2014b), Corrigendum to "Microphysical process rates and global aerosol-cloud interactions" published in Atmos. Chem. Phys., 13, 9855-9867, 2013, Atmos. Chem. Phys., 14, 9099-9103, doi: 10.5194/acp-14-9099-2014.
    • (2014) Atmos. Chem. Phys. , vol.14 , pp. 9099-9103
    • Gettelman, A.1    Morrison, H.2    Terai, C.R.3    Wood, R.4
  • 11
    • 84896522325 scopus 로고    scopus 로고
    • Optimization-based limiters for the spectral element method
    • Guba, O., M. A. Taylor, and, A. St.-Cyr, (2014), Optimization-based limiters for the spectral element method, J. Comput. Phys., 267, 176-195, doi: 10.1016/j.jcp.2014.02.029.
    • (2014) J. Comput. Phys. , vol.267 , pp. 176-195
    • Guba, O.1    Taylor, M.A.2    St.-Cyr, A.3
  • 13
    • 50849139199 scopus 로고    scopus 로고
    • Radiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models
    • Iacono, M., J. Delamere, E. Mlawer, M. Shephard, S. Clough, and, W. Collins, (2008), Radiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models, J. Geophys. Res., 113, D13103, doi: 10.1029/2008JD009944.
    • (2008) J. Geophys. Res. , vol.113 , pp. D13103
    • Iacono, M.1    Delamere, J.2    Mlawer, E.3    Shephard, M.4    Clough, S.5    Collins, W.6
  • 14
    • 45549097950 scopus 로고    scopus 로고
    • A baroclinic instabilitiy test case for atmospheric model dynamical cores
    • Jablonowski, C., and, D. L. Williamson, (2006), A baroclinic instabilitiy test case for atmospheric model dynamical cores, Q. J. R. Meteorol. Soc., 132, 2943-2975, doi: 10.1256/qj.06.12.
    • (2006) Q. J. R. Meteorol. Soc. , vol.132 , pp. 2943-2975
    • Jablonowski, C.1    Williamson, D.L.2
  • 15
    • 79952767655 scopus 로고    scopus 로고
    • Parameterization improvements and functional and structural advances in Version 4 of the Community Land Model
    • et al., doi: 10.1029/2011MS000045
    • Lawrence, D. M., et al. (2011), Parameterization improvements and functional and structural advances in Version 4 of the Community Land Model, J. Adv. Model. Earth Syst., 3, M03001, doi: 10.1029/2011MS000045.
    • (2011) J. Adv. Model. Earth Syst. , vol.3 , pp. M03001
    • Lawrence, D.M.1
  • 16
    • 2442585001 scopus 로고    scopus 로고
    • A "vertically Lagrangian" finite-volume dynamical core for global models
    • Lin, S.-J., (2004), A "vertically Lagrangian" finite-volume dynamical core for global models, Mon. Weather Rev., 132, 2293-2307, doi: 10.1175/1520-0493(2004)132 <2293:AVLFDC >2.0.CO;2.
    • (2004) Mon. Weather Rev. , vol.132 , pp. 2293-2307
    • Lin, S.-J.1
  • 17
    • 84861693185 scopus 로고    scopus 로고
    • Toward a minimal representation of aerosols in climate models: Description and evaluation in the Community Atmosphere Model CAM5
    • et al., doi: 10.5194/gmd-5-709-2012
    • Liu, X., et al. (2012), Toward a minimal representation of aerosols in climate models: Description and evaluation in the Community Atmosphere Model CAM5, Geosci. Model Dev., 5 (3), 709-739, doi: 10.5194/gmd-5-709-2012.
    • (2012) Geosci. Model Dev. , vol.5 , Issue.3 , pp. 709-739
    • Liu, X.1
  • 18
    • 71149116178 scopus 로고    scopus 로고
    • Sensitivity studies of different aerosol indirect effects in mixed-phase clouds
    • Lohmann, U., and, C. Hoose, (2009), Sensitivity studies of different aerosol indirect effects in mixed-phase clouds, Atmos. Chem. Phys., 9, 8917-8934, doi: 10.5194/acp-9-8917-2009.
    • (2009) Atmos. Chem. Phys. , vol.9 , pp. 8917-8934
    • Lohmann, U.1    Hoose, C.2
  • 19
    • 34547341225 scopus 로고    scopus 로고
    • Cloud microphysics and aerosol indirect effects in the global climate model ECHAM5-HAM
    • Lohmann, U., P. Stier, C. Hoose, S. Ferrachat, S. Kloster, E. Roeckner, and, J. Zhang, (2007), Cloud microphysics and aerosol indirect effects in the global climate model ECHAM5-HAM, Atmos. Chem. Phys., 7, 3425-3446, doi: 10.5194/acp-7-3425-2007.
    • (2007) Atmos. Chem. Phys. , vol.7 , pp. 3425-3446
    • Lohmann, U.1    Stier, P.2    Hoose, C.3    Ferrachat, S.4    Kloster, S.5    Roeckner, E.6    Zhang, J.7
  • 20
    • 0000241853 scopus 로고
    • Deterministic nonperiodic flow
    • Lorenz, E. N., (1963), Deterministic nonperiodic flow, J. Atmos. Sci., 20, 130-141, doi: 10.1175/1520-0469(1963)020 <0130:DNF >2.0.CO;2.
    • (1963) J. Atmos. Sci. , vol.20 , pp. 130-141
    • Lorenz, E.N.1
  • 21
    • 79960983921 scopus 로고    scopus 로고
    • Effects of time step size on the simulation of tropical climate in NCAR-CAM3
    • Mishra, S. K., and, S. Sahany, (2011), Effects of time step size on the simulation of tropical climate in NCAR-CAM3, Clim. Dyn., 37, 689-704, doi: 10.1007/s00382-011-0994-4.
    • (2011) Clim. Dyn. , vol.37 , pp. 689-704
    • Mishra, S.K.1    Sahany, S.2
  • 22
    • 57149129466 scopus 로고    scopus 로고
    • The impact of the time step on the intensity of ITCZ in an aquaplanet GCM
    • Mishra, S. K., J. Srinivasan, and, R. S. Nanjundiah, (2008), The impact of the time step on the intensity of ITCZ in an aquaplanet GCM, Mon. Weather Rev., 136, 4077-4091, doi: 10.1175/2008MWR2478.1.
    • (2008) Mon. Weather Rev. , vol.136 , pp. 4077-4091
    • Mishra, S.K.1    Srinivasan, J.2    Nanjundiah, R.S.3
  • 23
    • 0000453046 scopus 로고    scopus 로고
    • Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave
    • Mlawer, E. J., S. J. Taubman, P. D. Brown, M. J. Iacono, and, S. A. Clough, (1997), Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave., J. Geophys. Res., 102, 16,663-16,682, doi: 10.1029/97JD00237.
    • (1997) J. Geophys. Res. , vol.102 , pp. 16
    • Mlawer, E.J.1    Taubman, S.J.2    Brown, P.D.3    Iacono, M.J.4    Clough, S.A.5
  • 24
    • 52949143833 scopus 로고    scopus 로고
    • A new two-moment bulk stratiform cloud microphysics scheme in the NCAR Community Atmosphere model (CAM3), Part I: Description and numerical tests
    • Morrison, H., and, A. Gettelman, (2008), A new two-moment bulk stratiform cloud microphysics scheme in the NCAR Community Atmosphere model (CAM3), Part I: Description and numerical tests, J. Clim., 21, 3642-3659, doi: 10.1175/2008JCLI2105.1.
    • (2008) J. Clim. , vol.21 , pp. 3642-3659
    • Morrison, H.1    Gettelman, A.2
  • 25
    • 85058204074 scopus 로고    scopus 로고
    • A standard test for AGCMs including their physical parameterizations: I: The proposal
    • Neale, R. B., and, B. J. Hoskins, (2000), A standard test for AGCMs including their physical parameterizations: I: The proposal, Atmos. Sci. Lett., 1, 101-107, doi: 10.1006/asle.2000.0022.
    • (2000) Atmos. Sci. Lett. , vol.1 , pp. 101-107
    • Neale, R.B.1    Hoskins, B.J.2
  • 26
    • 56649113912 scopus 로고    scopus 로고
    • The impact of convection on ENSO: From a delayed oscillator to a series of events
    • Neale, R. B., J. H. Richter, and, M. Jochum, (2008), The impact of convection on ENSO: From a delayed oscillator to a series of events, J. Clim., 21, 5904-5924, doi: 10.1175/2008JCLI2244.1.
    • (2008) J. Clim. , vol.21 , pp. 5904-5924
    • Neale, R.B.1    Richter, J.H.2    Jochum, M.3
  • 28
    • 84874797242 scopus 로고    scopus 로고
    • The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments
    • Neale, R. B., J. Richter, S. Park, P. H. Lauritzen, S. J. Vavrus, P. J. Rasch, and, M. Zhang, (2013), The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments, J. Clim., 26, 5150-5168, doi: 10.1175/JCLI-D-12-00236.1.
    • (2013) J. Clim. , vol.26 , pp. 5150-5168
    • Neale, R.B.1    Richter, J.2    Park, S.3    Lauritzen, P.H.4    Vavrus, S.J.5    Rasch, P.J.6    Zhang, M.7
  • 29
    • 67650512617 scopus 로고    scopus 로고
    • The University of Washington shallow convection and moist turbulence schemes and their impact on climate simulations with the Community Atmosphere Model
    • Park, S., and, C. S. Bretherton, (2009), The University of Washington shallow convection and moist turbulence schemes and their impact on climate simulations with the Community Atmosphere Model, J. Clim., 22, 3449-3469, doi: 10.1175/2008JCLI2557.1.
    • (2009) J. Clim. , vol.22 , pp. 3449-3469
    • Park, S.1    Bretherton, C.S.2
  • 30
    • 84907050064 scopus 로고    scopus 로고
    • Integrating cloud processes in the Community Atmosphere Model, version 5
    • Park, S., C. S. Bretherton, and, P. J. Rasch, (2014), Integrating cloud processes in the Community Atmosphere Model, version 5., J. Clim., 27, 6821-6855, doi: 10.1175/JCLI-D-14-00087.1.
    • (2014) J. Clim. , vol.27 , pp. 6821-6855
    • Park, S.1    Bretherton, C.S.2    Rasch, P.J.3
  • 31
    • 45349102060 scopus 로고    scopus 로고
    • Introduction of prognostic rain in ECHAM5: Design and single column model simulations
    • Posselt, R., and, U. Lohmann, (2008), Introduction of prognostic rain in ECHAM5: Design and single column model simulations, Atmos. Chem. Phys., 8, 2949-2963, doi: 10.5194/acp-8-2949-2008.
    • (2008) Atmos. Chem. Phys. , vol.8 , pp. 2949-2963
    • Posselt, R.1    Lohmann, U.2
  • 32
    • 62749126696 scopus 로고    scopus 로고
    • Sensitivity of the total anthropogenic aerosol effect to the treatment of rain in a global climate model
    • Posselt, R., and, U. Lohmann, (2009), Sensitivity of the total anthropogenic aerosol effect to the treatment of rain in a global climate model, Geophys. Res. Lett., 36, L02805, doi: 10.1029/2008GL035796.
    • (2009) Geophys. Res. Lett. , vol.36 , pp. L02805
    • Posselt, R.1    Lohmann, U.2
  • 33
    • 1542607870 scopus 로고    scopus 로고
    • A comparison of the CCM3 model climate using diagnosed and predicted condensate parameterizations
    • Rasch, P. J., and, J. E. Kristjánsson, (1998), A comparison of the CCM3 model climate using diagnosed and predicted condensate parameterizations, J. Clim., 11, 1587-1614, doi: 10.1175/1520-0442(1998)011 <1587:ACOTCM >2.0.CO;2.
    • (1998) J. Clim. , vol.11 , pp. 1587-1614
    • Rasch, P.J.1    Kristjánsson, J.E.2
  • 34
    • 84867703870 scopus 로고    scopus 로고
    • Idealized tropical cyclone simulations of intermediate complexity: A test case for AGCMs
    • Reed, K. A., and, C. Jablonowski, (2012), Idealized tropical cyclone simulations of intermediate complexity: A test case for AGCMs, J. Adv. Model. Earth Syst., 4, M04001, doi: 10.1029/2011MS000099.
    • (2012) J. Adv. Model. Earth Syst. , vol.4 , pp. M04001
    • Reed, K.A.1    Jablonowski, C.2
  • 35
    • 44449134118 scopus 로고    scopus 로고
    • Effects of convective momentum transport on the atmospheric circulation in the Community Atmosphere Model, version 3
    • Richter, J. H., and, P. J. Rasch, (2008), Effects of convective momentum transport on the atmospheric circulation in the Community Atmosphere Model, version 3, J. Clim., 21, 1487-1499, doi: 10.1175/2007JCLI1789.1.
    • (2008) J. Clim. , vol.21 , pp. 1487-1499
    • Richter, J.H.1    Rasch, P.J.2
  • 36
    • 0031082736 scopus 로고    scopus 로고
    • The accumulation of rounding errors and port validation for global atmospheric models
    • Rosinski, J. M., and, D. L. Williamson, (1997), The accumulation of rounding errors and port validation for global atmospheric models, SIAM J. Sci. Comput., 18, 552-564, doi: 10.1137/S1064827594275534.
    • (1997) SIAM J. Sci. Comput. , vol.18 , pp. 552-564
    • Rosinski, J.M.1    Williamson, D.L.2
  • 37
    • 77956210438 scopus 로고    scopus 로고
    • Two-moment bulk stratiform cloud microphysics in the GFDL AM3 GCM: Description, evaluation, and sensitivity tests
    • Salzmann, M., Y. Ming, J.-C. Golaz, P. A. Ginoux, H. Morrison, A. Gettelman, M. Krämer, and, L. J. Donner, (2010), Two-moment bulk stratiform cloud microphysics in the GFDL AM3 GCM: Description, evaluation, and sensitivity tests, Atmos. Chem. Phys., 10, 8037-8064, doi: 10.5194/acp-10-8037-2010.
    • (2010) Atmos. Chem. Phys. , vol.10 , pp. 8037-8064
    • Salzmann, M.1    Ming, Y.2    Golaz, J.-C.3    Ginoux, P.A.4    Morrison, H.5    Gettelman, A.6    Krämer, M.7    Donner, L.J.8
  • 38
    • 0019711229 scopus 로고
    • An energy and angular-momentum conserving vertical finite difference scheme and hybrid vertical coordinates
    • Simmons, A. J., and, D. M. Burridge, (1981), An energy and angular-momentum conserving vertical finite difference scheme and hybrid vertical coordinates, Mon. Weather Rev., 109, 758-766, doi: 10.1175/1520-0493(1981)109 <0758:AEAAMC >2.0.CO;2.
    • (1981) Mon. Weather Rev. , vol.109 , pp. 758-766
    • Simmons, A.J.1    Burridge, D.M.2
  • 39
    • 77953620703 scopus 로고    scopus 로고
    • A compatible and conservative spectral element method on unstructured grids
    • Taylor, M. A., and, A. Fournier, (2010), A compatible and conservative spectral element method on unstructured grids, J. Comput. Phys., 229, 5879-5895, doi: 10.1016/j.jcp.2010.04.008.
    • (2010) J. Comput. Phys. , vol.229 , pp. 5879-5895
    • Taylor, M.A.1    Fournier, A.2
  • 40
    • 33846547718 scopus 로고    scopus 로고
    • Time step sensitivity of nonlinear atmospheric models: Numerical convergence, truncation error growth, and ensemble design
    • Teixeira, J., C. A. Reynolds, and, K. Judd, (2007), Time step sensitivity of nonlinear atmospheric models: Numerical convergence, truncation error growth, and ensemble design, J. Atmos. Sci., 64, 175-189, doi: 10.1175/JAS3824.1.
    • (2007) J. Atmos. Sci. , vol.64 , pp. 175-189
    • Teixeira, J.1    Reynolds, C.A.2    Judd, K.3
  • 42
    • 84907016622 scopus 로고    scopus 로고
    • Short ensembles: An efficient method for discerning climate-relevant sensitivities in atmospheric general circulation models
    • Wan, H., P. J. Rasch, K. Zhang, Y. Qian, H. Yan, and, C. Zhao, (2014), Short ensembles: An efficient method for discerning climate-relevant sensitivities in atmospheric general circulation models, Geosci. Model Dev., 7, 1961-1977, doi: 10.5194/gmd-7-1961-2014.
    • (2014) Geosci. Model Dev. , vol.7 , pp. 1961-1977
    • Wan, H.1    Rasch, P.J.2    Zhang, K.3    Qian, Y.4    Yan, H.5    Zhao, C.6
  • 43
    • 84875381154 scopus 로고    scopus 로고
    • The effect of time steps and time-scales on parametrization suites
    • Williamson, D. L., (2013), The effect of time steps and time-scales on parametrization suites, Q. J. R. Meteorol. Soc., 139, 548-560, doi: 10.1002/qj.1992.
    • (2013) Q. J. R. Meteorol. Soc. , vol.139 , pp. 548-560
    • Williamson, D.L.1
  • 44
    • 0037670504 scopus 로고    scopus 로고
    • Dependence of aqua-planet simulations on time step
    • Williamson, D. L., and, J. G. Olson, (2003), Dependence of aqua-planet simulations on time step, Q. J. R. Meteorol. Soc., 129, 2049-2064, doi: 10.1256/qj.02.62.
    • (2003) Q. J. R. Meteorol. Soc. , vol.129 , pp. 2049-2064
    • Williamson, D.L.1    Olson, J.G.2
  • 45
  • 48
    • 39549095502 scopus 로고
    • Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian Climate Centre general circulation model
    • Zhang, G. J., and, N. A. McFarlane, (1995), Sensitivity of climate simulations to the parameterization of cumulus convection in the Canadian Climate Centre general circulation model, Atmos. Ocean, 33, 407-446, doi: 10.1080/07055900.1995.9649539.
    • (1995) Atmos. Ocean , vol.33 , pp. 407-446
    • Zhang, G.J.1    McFarlane, N.A.2
  • 49
    • 0346639253 scopus 로고    scopus 로고
    • A modified formulation of fractional stratiform condensation rate in the NCAR Community Atmospheric Model (CAM2)
    • Zhang, M., W. Lin, C. S. Bretherton, J. J. Hack, and, P. J. Rasch, (2003), A modified formulation of fractional stratiform condensation rate in the NCAR Community Atmospheric Model (CAM2), J. Geophys. Res., 108 (D1), 4035, doi: 10.1029/2002JD002523.
    • (2003) J. Geophys. Res. , vol.108 , Issue.D1 , pp. 4035
    • Zhang, M.1    Lin, W.2    Bretherton, C.S.3    Hack, J.J.4    Rasch, P.J.5


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