| 1 | !---------------------------------------------------------------------- |
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| 2 | ! NEMO system team, System and Interface for oceanic RElocable Nesting |
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| 3 | !---------------------------------------------------------------------- |
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| 4 | ! |
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| 5 | ! DESCRIPTION: |
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| 6 | !> @brief This module defines physical constant. |
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| 7 | !> |
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| 8 | !> @author |
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| 9 | !> J.paul |
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| 10 | ! REVISION HISTORY: |
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| 11 | !> @date November, 2013 - Initial Version |
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| 12 | !> @date September, 2015 |
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| 13 | !> - add physical constant to compute meshmask |
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| 14 | !> @date January, 2019 |
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| 15 | !> - half reduce epsilon value |
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| 16 | !> |
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| 17 | !> @note Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 18 | !---------------------------------------------------------------------- |
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| 19 | MODULE phycst |
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| 20 | |
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| 21 | USE kind ! F90 kind parameter |
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| 22 | |
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| 23 | IMPLICIT NONE |
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| 24 | ! NOTE_avoid_public_variables_if_possible |
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| 25 | |
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| 26 | PUBLIC :: dp_pi !< pi |
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| 27 | PUBLIC :: dp_eps !< epsilon value |
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| 28 | PUBLIC :: dp_rearth !< earth radius [m] |
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| 29 | PUBLIC :: dp_deg2rad !< degree to radian ratio |
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| 30 | PUBLIC :: dp_rad2deg !< radian to degree ratio |
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| 31 | PUBLIC :: dp_delta !< |
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| 32 | PUBLIC :: dp_omega !< earth rotation parameter [s-1] |
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| 33 | PUBLIC :: dp_day !< day [s] |
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| 34 | PUBLIC :: dp_siyea !< sideral year [s] |
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| 35 | PUBLIC :: dp_siday !< sideral day [s] |
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| 36 | |
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| 37 | REAL(dp), PUBLIC :: rday = 24.*60.*60. !: day [s] |
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| 38 | REAL(dp), PUBLIC :: rsiyea !: sideral year [s] |
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| 39 | REAL(dp), PUBLIC :: rsiday !: sideral day [s] |
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| 40 | |
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| 41 | REAL(dp), PARAMETER :: dp_pi = 3.14159274101257_dp |
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| 42 | REAL(dp), PARAMETER :: dp_eps = 0.5 * EPSILON(1._dp) |
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| 43 | REAL(dp), PARAMETER :: dp_rearth = 6371229._dp !m |
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| 44 | REAL(dp), PARAMETER :: dp_deg2rad = dp_pi/180.0 |
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| 45 | REAL(dp), PARAMETER :: dp_rad2deg = 180.0/dp_pi |
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| 46 | |
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| 47 | REAL(dp), PARAMETER :: dp_day = 24.*60.*60. |
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| 48 | REAL(dp), PARAMETER :: dp_siyea = 365.25_dp * dp_day * & |
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| 49 | & 2._dp * dp_pi / 6.283076_dp |
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| 50 | REAL(dp), PARAMETER :: dp_siday = dp_day / ( 1._dp + dp_day / dp_siyea ) |
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| 51 | |
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| 52 | REAL(dp), PARAMETER :: dp_delta=1.e-6 |
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| 53 | REAL(dp), PARAMETER :: dp_omega= 2._dp * dp_pi / dp_siday |
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| 54 | |
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| 55 | END MODULE phycst |
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| 56 | |
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