| 379 | | }}} |
| 380 | | |---------------- |
| 381 | | {{{#!td style="vertical-align:top" |
| 382 | | [=#ocean '''ocean'''] |
| 383 | | }}} |
| 384 | | {{{#!td style="vertical-align:top" |
| 385 | | L |
| 386 | | }}} |
| 387 | | {{{#!td style="vertical-align:top" |
| 388 | | .F. |
| 389 | | }}} |
| 390 | | {{{#!td |
| 391 | | Parameter to switch on ocean mode runs.\\\\ |
| 392 | | By default PALM is configured to simulate atmospheric flows. However, starting from version 3.3, '''ocean''' = ''.T.'' allows simulation of ocean turbulent flows. Setting this switch has several effects:\\\\ |
| 393 | | * An additional prognostic equation for salinity is solved.[[BR]] |
| 394 | | |
| 395 | | * The potential temperature in buoyancy and stability-related terms is replaced by potential density.[[BR]] |
| 396 | | |
| 397 | | * Potential density is calculated from the equation of state for seawater after each time step, using the algorithm proposed by Jackett et al. (2006, J. Atmos. Oceanic Technol., 23, 1709-1728).[[BR]] |
| 398 | | |
| 399 | | So far, only the initial hydrostatic pressure is entered into this equation.[[BR]] |
| 400 | | |
| 401 | | * z=0 (sea surface) is assumed at the model top (vertical grid index k=[#nzt nzt] on the w-grid), with negative values of z indicating the depth.[[BR]] |
| 402 | | |
| 403 | | * Initial profiles are constructed (e.g. from [#pt_vertical_gradient pt_vertical_gradient] / [#pt_vertical_gradient_level pt_vertical_gradient_level]) starting from the sea surface, using surface values given by [#pt_surface pt_surface], [#sa_surface sa_surface], [#ug_surface ug_surface], and [#vg_surface vg_surface].[[BR]] |
| 404 | | |
| 405 | | * Zero salinity flux is used as default boundary condition at the bottom of the sea.[[BR]] |
| 406 | | |
| 407 | | * If switched on, random perturbations are by default imposed to the upper model domain from zu(nzt*2/3) to zu(nzt-3).\\\\ |
| 408 | | Relevant parameters to be exclusively used for steering ocean mode runs are [#bc_sa_t bc_sa_t], [#bottom_salinityflux bottom_salinityflux], [#sa_surface sa_surface], [#sa_vertical_gradient sa_vertical_gradient], [#sa_vertical_gradient_level sa_vertical_gradient_level], and [#top_salinityflux top_salinityflux].\\\\ |
| 409 | | Section [[4.4.2]] gives an example for appropriate settings of these and other parameters necessary for ocean mode runs. |
