When I run the model for a year, the water temperature is cooling constantly. I use this header for my grid (Lake, close boundary). What can be the reason?
Thank you
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#define SOLVE3D
#define USE_MPI
#define RADIATION_2D
#define UV_ADV
#define UV_COR
#define UV_LDRAG
#define UV_VIS2
#define MIX_S_UV
#define MIX_GEO_TS
#define SPLINES_VDIFF
#define SPLINES_VVISC
#define DJ_GRADPS
#define TS_DIF2
#undef TS_DIF4
#define SALINITY
#define GLS_MIXING
#if defined GLS_MIXING || defined MY25_MIXING
# define KANTHA_CLAYSON
# define N2S2_HORAVG
# define RI_SPLINES
#else
# define ANA_VMIX
#endif
#define ANA_SMFLUX
#define ANA_BTFLUX
#define ANA_BSFLUX
#define ANA_SSFLUX
/* General */
#define CURVGRID
#define MASKING
#undef WET_DRY
#define NONLIN_EOS
/* Surface Forcing */
#ifdef SOLVE3D
# define CORE_FORCING
# define BULK_FLUXES
# undef CCSM_FLUXES
# if defined BULK_FLUXES || defined CCSM_FLUXES
# undef LONGWAVE_OUT
# undef LONGWAVE
# undef ANA_SRFLUX
# define SOLAR_SOURCE
#endif
/* Output */
#define AVERAGES
#undef PERFECT_RESTART
#ifdef PERFECT_RESTART
# define RST_SINGLE
#endif