[2956] | 1 | MODULE tide_mod |
---|
| 2 | !!================================================================================= |
---|
| 3 | !! *** MODULE tide_mod *** |
---|
| 4 | !! Compute nodal modulations corrections and pulsations |
---|
| 5 | !!================================================================================= |
---|
| 6 | !!--------------------------------------------------------------------------------- |
---|
| 7 | !! OPA 9.0 , LODYC-IPSL (2003) |
---|
| 8 | !!--------------------------------------------------------------------------------- |
---|
| 9 | USE dom_oce ! ocean space and time domain |
---|
| 10 | USE phycst |
---|
| 11 | USE daymod |
---|
| 12 | |
---|
| 13 | IMPLICIT NONE |
---|
| 14 | PRIVATE |
---|
| 15 | |
---|
| 16 | REAL(wp) :: sh_T, sh_s, sh_h, sh_p, sh_p1, & |
---|
| 17 | sh_xi, sh_nu, sh_nuprim, sh_nusec, sh_R, & |
---|
| 18 | sh_I, sh_x1ra, sh_N |
---|
| 19 | |
---|
| 20 | INTEGER,PUBLIC, PARAMETER :: & |
---|
| 21 | jpmax_harmo = 19 ! maximum number of harmonic |
---|
| 22 | |
---|
[3670] | 23 | TYPE, PUBLIC :: tide |
---|
[2956] | 24 | CHARACTER(LEN=4) :: cname_tide |
---|
| 25 | REAL(wp) :: equitide |
---|
| 26 | INTEGER :: nutide |
---|
| 27 | INTEGER :: nt,ns,nh,np,np1,shift |
---|
| 28 | INTEGER :: nksi,nnu0,nnu1,nnu2,R |
---|
| 29 | INTEGER :: nformula |
---|
| 30 | END TYPE tide |
---|
| 31 | |
---|
| 32 | TYPE(tide), PUBLIC, DIMENSION(jpmax_harmo) :: Wave |
---|
| 33 | |
---|
| 34 | !! * Accessibility |
---|
| 35 | PUBLIC tide_harmo |
---|
| 36 | PUBLIC nodal_factort |
---|
| 37 | PUBLIC tide_init_Wave |
---|
| 38 | |
---|
| 39 | CONTAINS |
---|
| 40 | |
---|
| 41 | SUBROUTINE tide_init_Wave |
---|
| 42 | |
---|
| 43 | # include "tide.h90" |
---|
| 44 | |
---|
| 45 | END SUBROUTINE tide_init_Wave |
---|
| 46 | |
---|
| 47 | SUBROUTINE tide_harmo( pomega, pvt, put , pcor, ktide ,kc) |
---|
| 48 | |
---|
| 49 | INTEGER, DIMENSION(kc), INTENT( in ) :: & |
---|
| 50 | ktide ! Indice of tidal constituents |
---|
| 51 | |
---|
| 52 | INTEGER, INTENT( in ) :: & |
---|
| 53 | kc ! Total number of tidal constituents |
---|
| 54 | |
---|
| 55 | REAL (wp), DIMENSION(kc), INTENT( out ) :: & |
---|
| 56 | pomega ! pulsation in radians/s |
---|
| 57 | |
---|
| 58 | REAL (wp), DIMENSION(kc), INTENT( out ) :: & |
---|
| 59 | pvt, & ! |
---|
| 60 | put, & ! |
---|
| 61 | pcor ! |
---|
| 62 | |
---|
| 63 | CALL astronomic_angle |
---|
| 64 | CALL tide_pulse(pomega, ktide ,kc) |
---|
| 65 | CALL tide_vuf( pvt, put, pcor, ktide ,kc) |
---|
| 66 | |
---|
| 67 | END SUBROUTINE tide_harmo |
---|
| 68 | |
---|
| 69 | SUBROUTINE astronomic_angle |
---|
| 70 | |
---|
| 71 | !!---------------------------------------------------------------------- |
---|
| 72 | !! |
---|
| 73 | !! tj is time elapsed since 1st January 1900, 0 hour, counted in julian |
---|
| 74 | !! century (e.g. time in days divide by 36525) |
---|
| 75 | !!---------------------------------------------------------------------- |
---|
| 76 | |
---|
| 77 | REAL(wp) :: cosI,p,q,t2,t4,sin2I,s2,tgI2,P1,sh_tgn2,at1,at2 |
---|
| 78 | REAL(wp) :: zqy,zsy,zday,zdj,zhfrac |
---|
| 79 | |
---|
| 80 | zqy=AINT((nyear-1901.)/4.) |
---|
| 81 | zsy=nyear-1900. |
---|
| 82 | |
---|
| 83 | zdj=dayjul(nyear,nmonth,nday) |
---|
| 84 | zday=zdj+zqy-1. |
---|
| 85 | |
---|
| 86 | zhfrac=nsec_day/3600. |
---|
| 87 | |
---|
| 88 | !---------------------------------------------------------------------- |
---|
| 89 | ! Sh_n Longitude of ascending lunar node |
---|
| 90 | !---------------------------------------------------------------------- |
---|
| 91 | |
---|
| 92 | sh_N=(259.1560564-19.328185764*zsy-.0529539336*zday-.0022064139*zhfrac)*rad |
---|
| 93 | !---------------------------------------------------------------------- |
---|
| 94 | ! T mean solar angle (Greenwhich time) |
---|
| 95 | !---------------------------------------------------------------------- |
---|
| 96 | sh_T=(180.+zhfrac*(360./24.))*rad |
---|
| 97 | !---------------------------------------------------------------------- |
---|
| 98 | ! h mean solar Longitude |
---|
| 99 | !---------------------------------------------------------------------- |
---|
| 100 | |
---|
| 101 | sh_h=(280.1895014-.238724988*zsy+.9856473288*zday+.0410686387*zhfrac)*rad |
---|
| 102 | !---------------------------------------------------------------------- |
---|
| 103 | ! s mean lunar Longitude |
---|
| 104 | !---------------------------------------------------------------------- |
---|
| 105 | |
---|
| 106 | sh_s=(277.0256206+129.38482032*zsy+13.176396768*zday+.549016532*zhfrac)*rad |
---|
| 107 | !---------------------------------------------------------------------- |
---|
| 108 | ! p1 Longitude of solar perigee |
---|
| 109 | !---------------------------------------------------------------------- |
---|
| 110 | |
---|
| 111 | sh_p1=(281.2208569+.01717836*zsy+.000047064*zday+.000001961*zhfrac)*rad |
---|
| 112 | !---------------------------------------------------------------------- |
---|
| 113 | ! p Longitude of lunar perigee |
---|
| 114 | !---------------------------------------------------------------------- |
---|
| 115 | |
---|
| 116 | sh_p=(334.3837214+40.66246584*zsy+.111404016*zday+.004641834*zhfrac)*rad |
---|
| 117 | |
---|
| 118 | sh_N =mod(sh_N ,2*rpi) |
---|
| 119 | sh_s =mod(sh_s ,2*rpi) |
---|
| 120 | sh_h =mod(sh_h, 2*rpi) |
---|
| 121 | sh_p =mod(sh_p, 2*rpi) |
---|
| 122 | sh_p1=mod(sh_p1,2*rpi) |
---|
| 123 | |
---|
| 124 | cosI=0.913694997 -0.035692561 *cos(sh_N) |
---|
| 125 | |
---|
| 126 | sh_I=acos(cosI) |
---|
| 127 | |
---|
| 128 | sin2I=sin(sh_I) |
---|
| 129 | sh_tgn2=tan(sh_N/2.0) |
---|
| 130 | |
---|
| 131 | at1=atan(1.01883*sh_tgn2) |
---|
| 132 | at2=atan(0.64412*sh_tgn2) |
---|
| 133 | |
---|
| 134 | sh_xi=-at1-at2+sh_N |
---|
| 135 | |
---|
| 136 | if (sh_N > rpi) sh_xi=sh_xi-2.0*rpi |
---|
| 137 | |
---|
| 138 | sh_nu=at1-at2 |
---|
| 139 | |
---|
| 140 | !---------------------------------------------------------------------- |
---|
| 141 | ! For constituents l2 k1 k2 |
---|
| 142 | !---------------------------------------------------------------------- |
---|
| 143 | |
---|
| 144 | tgI2=tan(sh_I/2.0) |
---|
| 145 | P1=sh_p-sh_xi |
---|
| 146 | |
---|
| 147 | t2=tgI2*tgI2 |
---|
| 148 | t4=t2*t2 |
---|
| 149 | sh_x1ra=sqrt(1.0-12.0*t2*cos(2.0*P1)+36.0*t4) |
---|
| 150 | |
---|
| 151 | p=sin(2.0*P1) |
---|
| 152 | q=1.0/(6.0*t2)-cos(2.0*P1) |
---|
| 153 | sh_R=atan(p/q) |
---|
| 154 | |
---|
| 155 | p=sin(2.0*sh_I)*sin(sh_nu) |
---|
| 156 | q=sin(2.0*sh_I)*cos(sh_nu)+0.3347 |
---|
| 157 | sh_nuprim=atan(p/q) |
---|
| 158 | |
---|
| 159 | s2=sin(sh_I)*sin(sh_I) |
---|
| 160 | p=s2*sin(2.0*sh_nu) |
---|
| 161 | q=s2*cos(2.0*sh_nu)+0.0727 |
---|
| 162 | sh_nusec=0.5*atan(p/q) |
---|
| 163 | |
---|
| 164 | END SUBROUTINE astronomic_angle |
---|
| 165 | |
---|
| 166 | SUBROUTINE tide_pulse( pomega, ktide ,kc) |
---|
| 167 | !!---------------------------------------------------------------------- |
---|
| 168 | !! *** ROUTINE tide_pulse *** |
---|
| 169 | !! |
---|
| 170 | !! ** Purpose : Compute tidal frequencies |
---|
| 171 | !! |
---|
| 172 | !!---------------------------------------------------------------------- |
---|
| 173 | !! * Arguments |
---|
| 174 | INTEGER, DIMENSION(kc), INTENT( in ) :: & |
---|
| 175 | ktide ! Indice of tidal constituents |
---|
| 176 | |
---|
| 177 | INTEGER, INTENT( in ) :: & |
---|
| 178 | kc ! Total number of tidal constituents |
---|
| 179 | |
---|
| 180 | REAL (wp), DIMENSION(kc), INTENT( out ) :: & |
---|
| 181 | pomega ! pulsation in radians/s |
---|
| 182 | |
---|
| 183 | !! * Local declarations |
---|
| 184 | INTEGER :: jh |
---|
| 185 | REAL(wp) :: zscale = 36525*24.0 |
---|
| 186 | REAL(wp) :: zomega_T= 13149000.0 |
---|
| 187 | REAL(wp) :: zomega_s= 481267.892 |
---|
| 188 | REAL(wp) :: zomega_h= 36000.76892 |
---|
| 189 | REAL(wp) :: zomega_p= 4069.0322056 |
---|
| 190 | REAL(wp) :: zomega_n= 1934.1423972 |
---|
| 191 | REAL(wp) :: zomega_p1= 1.719175 |
---|
| 192 | !!---------------------------------------------------------------------- |
---|
| 193 | |
---|
| 194 | DO jh=1,kc |
---|
| 195 | pomega(jh) = zomega_T * Wave(ktide(jh))%nT & |
---|
| 196 | + zomega_s * Wave(ktide(jh))%ns & |
---|
| 197 | + zomega_h * Wave(ktide(jh))%nh & |
---|
| 198 | + zomega_p * Wave(ktide(jh))%np & |
---|
| 199 | + zomega_p1* Wave(ktide(jh))%np1 |
---|
| 200 | pomega(jh) = (pomega(jh)/zscale)*rad/3600. |
---|
| 201 | END DO |
---|
| 202 | |
---|
| 203 | END SUBROUTINE tide_pulse |
---|
| 204 | |
---|
| 205 | SUBROUTINE tide_vuf( pvt, put, pcor, ktide ,kc) |
---|
| 206 | !!---------------------------------------------------------------------- |
---|
| 207 | !! *** ROUTINE tide_vuf *** |
---|
| 208 | !! |
---|
| 209 | !! ** Purpose : Compute nodal modulation corrections |
---|
| 210 | !! |
---|
| 211 | !! ** Outputs : |
---|
| 212 | !! vt: Pase of tidal potential relative to Greenwich (radians) |
---|
| 213 | !! ut: Phase correction u due to nodal motion (radians) |
---|
| 214 | !! ft: Nodal correction factor |
---|
| 215 | !! |
---|
| 216 | !! ** Inputs : |
---|
| 217 | !! tname: array of constituents names (dimension<=nc) |
---|
| 218 | !! nc: number of constituents |
---|
| 219 | !! |
---|
| 220 | !!---------------------------------------------------------------------- |
---|
| 221 | !! * Arguments |
---|
| 222 | INTEGER, DIMENSION(kc), INTENT( in ) :: & |
---|
| 223 | ktide ! Indice of tidal constituents |
---|
| 224 | INTEGER, INTENT( in ) :: & |
---|
| 225 | kc ! Total number of tidal constituents |
---|
| 226 | REAL (wp), DIMENSION(kc), INTENT( out ) :: & |
---|
| 227 | pvt, & ! |
---|
| 228 | put, & ! |
---|
| 229 | pcor ! |
---|
| 230 | !! * Local declarations |
---|
| 231 | INTEGER :: jh |
---|
| 232 | !!---------------------------------------------------------------------- |
---|
| 233 | |
---|
| 234 | DO jh =1,kc |
---|
| 235 | ! Phase of the tidal potential relative to the Greenwhich |
---|
| 236 | ! meridian (e.g. the position of the fictuous celestial body). Units are |
---|
| 237 | ! radian: |
---|
| 238 | pvt(jh) = sh_T *Wave(ktide(jh))%nT & |
---|
| 239 | +sh_s *Wave(ktide(jh))%ns & |
---|
| 240 | +sh_h *Wave(ktide(jh))%nh & |
---|
| 241 | +sh_p *Wave(ktide(jh))%np & |
---|
| 242 | +sh_p1*Wave(ktide(jh))%np1 & |
---|
| 243 | +Wave(ktide(jh))%shift*rad |
---|
| 244 | ! |
---|
| 245 | ! Phase correction u due to nodal motion. Units are radian: |
---|
| 246 | put(jh) = sh_xi *Wave(ktide(jh))%nksi & |
---|
| 247 | +sh_nu *Wave(ktide(jh))%nnu0 & |
---|
| 248 | +sh_nuprim*Wave(ktide(jh))%nnu1 & |
---|
| 249 | +sh_nusec *Wave(ktide(jh))%nnu2 & |
---|
| 250 | +sh_R *Wave(ktide(jh))%R |
---|
| 251 | |
---|
| 252 | ! Nodal correction factor: |
---|
| 253 | pcor(jh) = nodal_factort(Wave(ktide(jh))%nformula) |
---|
| 254 | END DO |
---|
| 255 | |
---|
| 256 | END SUBROUTINE tide_vuf |
---|
| 257 | |
---|
| 258 | recursive function nodal_factort(kformula) result (zf) |
---|
| 259 | !!---------------------------------------------------------------------- |
---|
| 260 | INTEGER, INTENT(IN) :: kformula |
---|
| 261 | REAL(wp) :: zf |
---|
| 262 | REAL(wp) :: zs,zf1,zf2 |
---|
| 263 | |
---|
| 264 | SELECT CASE (kformula) |
---|
| 265 | |
---|
| 266 | !! formule 0, solar waves |
---|
| 267 | |
---|
| 268 | case ( 0 ) |
---|
| 269 | zf=1.0 |
---|
| 270 | |
---|
| 271 | !! formule 1, compound waves (78 x 78) |
---|
| 272 | |
---|
| 273 | case ( 1 ) |
---|
| 274 | zf=nodal_factort(78) |
---|
| 275 | zf=zf*zf |
---|
| 276 | |
---|
| 277 | !! formule 2, compound waves (78 x 0) === (78) |
---|
| 278 | |
---|
| 279 | case ( 2 ) |
---|
| 280 | zf1=nodal_factort(78) |
---|
| 281 | zf=nodal_factort(0) |
---|
| 282 | zf=zf1*zf |
---|
| 283 | |
---|
| 284 | !! formule 4, compound waves (78 x 235) |
---|
| 285 | |
---|
| 286 | case ( 4 ) |
---|
| 287 | zf1=nodal_factort(78) |
---|
| 288 | zf=nodal_factort(235) |
---|
| 289 | zf=zf1*zf |
---|
| 290 | |
---|
| 291 | !! formule 5, compound waves (78 *78 x 235) |
---|
| 292 | |
---|
| 293 | case ( 5 ) |
---|
| 294 | zf1=nodal_factort(78) |
---|
| 295 | zf=nodal_factort(235) |
---|
| 296 | zf=zf*zf1*zf1 |
---|
| 297 | |
---|
| 298 | !! formule 6, compound waves (78 *78 x 0) |
---|
| 299 | |
---|
| 300 | case ( 6 ) |
---|
| 301 | zf1=nodal_factort(78) |
---|
| 302 | zf=nodal_factort(0) |
---|
| 303 | zf=zf*zf1*zf1 |
---|
| 304 | |
---|
| 305 | !! formule 7, compound waves (75 x 75) |
---|
| 306 | |
---|
| 307 | case ( 7 ) |
---|
| 308 | zf=nodal_factort(75) |
---|
| 309 | zf=zf*zf |
---|
| 310 | |
---|
| 311 | !! formule 8, compound waves (78 x 0 x 235) |
---|
| 312 | |
---|
| 313 | case ( 8 ) |
---|
| 314 | zf=nodal_factort(78) |
---|
| 315 | zf1=nodal_factort(0) |
---|
| 316 | zf2=nodal_factort(235) |
---|
| 317 | zf=zf*zf1*zf2 |
---|
| 318 | |
---|
| 319 | !! formule 9, compound waves (78 x 0 x 227) |
---|
| 320 | |
---|
| 321 | case ( 9 ) |
---|
| 322 | zf=nodal_factort(78) |
---|
| 323 | zf1=nodal_factort(0) |
---|
| 324 | zf2=nodal_factort(227) |
---|
| 325 | zf=zf*zf1*zf2 |
---|
| 326 | |
---|
| 327 | !! formule 10, compound waves (78 x 227) |
---|
| 328 | |
---|
| 329 | case ( 10 ) |
---|
| 330 | zf=nodal_factort(78) |
---|
| 331 | zf1=nodal_factort(227) |
---|
| 332 | zf=zf*zf1 |
---|
| 333 | |
---|
| 334 | !! formule 11, compound waves (75 x 0) |
---|
| 335 | |
---|
| 336 | case ( 11 ) |
---|
| 337 | zf=nodal_factort(75) |
---|
| 338 | zf=nodal_factort(0) |
---|
| 339 | zf=zf*zf1 |
---|
| 340 | |
---|
| 341 | !! formule 12, compound waves (78 x 78 x 78 x 0) |
---|
| 342 | |
---|
| 343 | case ( 12 ) |
---|
| 344 | zf1=nodal_factort(78) |
---|
| 345 | zf=nodal_factort(0) |
---|
| 346 | zf=zf*zf1*zf1*zf1 |
---|
| 347 | |
---|
| 348 | !! formule 13, compound waves (78 x 75) |
---|
| 349 | |
---|
| 350 | case ( 13 ) |
---|
| 351 | zf1=nodal_factort(78) |
---|
| 352 | zf=nodal_factort(75) |
---|
| 353 | zf=zf*zf1 |
---|
| 354 | |
---|
| 355 | !! formule 14, compound waves (235 x 0) === (235) |
---|
| 356 | |
---|
| 357 | case ( 14 ) |
---|
| 358 | zf=nodal_factort(235) |
---|
| 359 | zf1=nodal_factort(0) |
---|
| 360 | zf=zf*zf1 |
---|
| 361 | |
---|
| 362 | !! formule 15, compound waves (235 x 75) |
---|
| 363 | |
---|
| 364 | case ( 15 ) |
---|
| 365 | zf=nodal_factort(235) |
---|
| 366 | zf1=nodal_factort(75) |
---|
| 367 | zf=zf*zf1 |
---|
| 368 | |
---|
| 369 | !! formule 16, compound waves (78 x 0 x 0) === (78) |
---|
| 370 | |
---|
| 371 | case ( 16 ) |
---|
| 372 | zf=nodal_factort(78) |
---|
| 373 | zf1=nodal_factort(0) |
---|
| 374 | zf=zf*zf1*zf1 |
---|
| 375 | |
---|
| 376 | !! formule 17, compound waves (227 x 0) |
---|
| 377 | |
---|
| 378 | case ( 17 ) |
---|
| 379 | zf1=nodal_factort(227) |
---|
| 380 | zf=nodal_factort(0) |
---|
| 381 | zf=zf*zf1 |
---|
| 382 | |
---|
| 383 | !! formule 18, compound waves (78 x 78 x 78 ) |
---|
| 384 | |
---|
| 385 | case ( 18 ) |
---|
| 386 | zf1=nodal_factort(78) |
---|
| 387 | zf=zf1*zf1*zf1 |
---|
| 388 | |
---|
| 389 | !! formule 19, compound waves (78 x 0 x 0 x 0) === (78) |
---|
| 390 | |
---|
| 391 | case ( 19 ) |
---|
| 392 | zf=nodal_factort(78) |
---|
| 393 | zf1=nodal_factort(0) |
---|
| 394 | zf=zf*zf1*zf1 |
---|
| 395 | |
---|
| 396 | !! formule 73 |
---|
| 397 | |
---|
| 398 | case ( 73 ) |
---|
| 399 | zs=sin(sh_I) |
---|
| 400 | zf=(2./3.-zs*zs)/0.5021 |
---|
| 401 | |
---|
| 402 | !! formule 74 |
---|
| 403 | |
---|
| 404 | case ( 74 ) |
---|
| 405 | zs=sin(sh_I) |
---|
| 406 | zf=zs*zs/0.1578 |
---|
| 407 | |
---|
| 408 | !! formule 75 |
---|
| 409 | |
---|
| 410 | case ( 75 ) |
---|
| 411 | zs=cos (sh_I/2) |
---|
| 412 | zf=sin (sh_I)*zs*zs/0.3800 |
---|
| 413 | |
---|
| 414 | !! formule 76 |
---|
| 415 | |
---|
| 416 | case ( 76 ) |
---|
| 417 | zf=sin (2*sh_I)/0.7214 |
---|
| 418 | |
---|
| 419 | !! formule 77 |
---|
| 420 | |
---|
| 421 | case ( 77 ) |
---|
| 422 | zs=sin (sh_I/2) |
---|
| 423 | zf=sin (sh_I)*zs*zs/0.0164 |
---|
| 424 | |
---|
| 425 | !! formule 78 |
---|
| 426 | |
---|
| 427 | case ( 78 ) |
---|
| 428 | zs=cos (sh_I/2) |
---|
| 429 | zf=zs*zs*zs*zs/0.9154 |
---|
| 430 | |
---|
| 431 | !! formule 79 |
---|
| 432 | |
---|
| 433 | case ( 79 ) |
---|
| 434 | zs=sin(sh_I) |
---|
| 435 | zf=zs*zs/0.1565 |
---|
| 436 | |
---|
| 437 | !! formule 144 |
---|
| 438 | |
---|
| 439 | case ( 144 ) |
---|
| 440 | zs=sin (sh_I/2) |
---|
| 441 | zf=(1-10*zs*zs+15*zs*zs*zs*zs)*cos(sh_I/2)/0.5873 |
---|
| 442 | |
---|
| 443 | !! formule 149 |
---|
| 444 | |
---|
| 445 | case ( 149 ) |
---|
| 446 | zs=cos (sh_I/2) |
---|
| 447 | zf=zs*zs*zs*zs*zs*zs/0.8758 |
---|
| 448 | |
---|
| 449 | !! formule 215 |
---|
| 450 | |
---|
| 451 | case ( 215 ) |
---|
| 452 | zs=cos (sh_I/2) |
---|
| 453 | zf=zs*zs*zs*zs/0.9154*sh_x1ra |
---|
| 454 | |
---|
| 455 | !! formule 227 |
---|
| 456 | |
---|
| 457 | case ( 227 ) |
---|
| 458 | zs=sin (2*sh_I) |
---|
| 459 | zf=sqrt (0.8965*zs*zs+0.6001*zs*cos (sh_nu)+0.1006) |
---|
| 460 | |
---|
| 461 | !! formule 235 |
---|
| 462 | |
---|
| 463 | case ( 235 ) |
---|
| 464 | zs=sin (sh_I) |
---|
| 465 | zf=sqrt (19.0444*zs*zs*zs*zs+2.7702*zs*zs*cos (2*sh_nu)+.0981) |
---|
| 466 | |
---|
| 467 | END SELECT |
---|
| 468 | |
---|
| 469 | end function nodal_factort |
---|
| 470 | |
---|
| 471 | function dayjul(kyr,kmonth,kday) |
---|
| 472 | ! |
---|
| 473 | !*** THIS ROUTINE COMPUTES THE JULIAN DAY (AS A REAL VARIABLE) |
---|
| 474 | ! |
---|
| 475 | INTEGER,INTENT(IN) :: kyr,kmonth,kday |
---|
| 476 | INTEGER,DIMENSION(12) :: idayt,idays |
---|
| 477 | INTEGER :: inc,ji |
---|
| 478 | REAL(wp) :: dayjul,zyq |
---|
| 479 | |
---|
| 480 | DATA idayt/0.,31.,59.,90.,120.,151.,181.,212.,243.,273.,304.,334./ |
---|
| 481 | idays(1)=0. |
---|
| 482 | idays(2)=31. |
---|
| 483 | inc=0. |
---|
| 484 | zyq=MOD((kyr-1900.),4.) |
---|
| 485 | IF(zyq .eq. 0.) inc=1. |
---|
| 486 | DO ji=3,12 |
---|
| 487 | idays(ji)=idayt(ji)+inc |
---|
| 488 | END DO |
---|
| 489 | dayjul=idays(kmonth)+kday |
---|
| 490 | |
---|
| 491 | END FUNCTION dayjul |
---|
| 492 | |
---|
| 493 | END MODULE tide_mod |
---|