1 | MODULE trcdms_medusa |
---|
2 | !!====================================================================== |
---|
3 | !! *** MODULE trcdms_medusa *** |
---|
4 | !! TOP : MEDUSA |
---|
5 | !!====================================================================== |
---|
6 | !! History : |
---|
7 | !! - ! 2014-08 (J. Palmieri - A. Yool) added for UKESM1 project |
---|
8 | !! - ! 2017-05 (A. Yool) add extra Anderson scheme |
---|
9 | !! - ! 2018-10 (A. Yool) Add air-sea DMS flux |
---|
10 | !!---------------------------------------------------------------------- |
---|
11 | #if defined key_medusa && defined key_roam |
---|
12 | !!---------------------------------------------------------------------- |
---|
13 | !! MEDUSA DMS surface concentration |
---|
14 | !!---------------------------------------------------------------------- |
---|
15 | !! trc_dms_medusa : |
---|
16 | !!---------------------------------------------------------------------- |
---|
17 | USE oce_trc |
---|
18 | USE trc |
---|
19 | USE sms_medusa |
---|
20 | USE lbclnk |
---|
21 | USE prtctl_trc ! Print control for debugging |
---|
22 | USE in_out_manager ! I/O manager |
---|
23 | |
---|
24 | USE yomhook, ONLY: lhook, dr_hook |
---|
25 | USE parkind1, ONLY: jprb, jpim |
---|
26 | |
---|
27 | IMPLICIT NONE |
---|
28 | PRIVATE |
---|
29 | |
---|
30 | PUBLIC trc_dms_medusa ! called in trc_bio_medusa |
---|
31 | PUBLIC dms_flux_ocn ! called in air_sea |
---|
32 | |
---|
33 | !!* Substitution |
---|
34 | # include "domzgr_substitute.h90" |
---|
35 | !!---------------------------------------------------------------------- |
---|
36 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
---|
37 | !! $Id$ |
---|
38 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
39 | !!---------------------------------------------------------------------- |
---|
40 | |
---|
41 | |
---|
42 | CONTAINS |
---|
43 | |
---|
44 | !======================================================================= |
---|
45 | ! |
---|
46 | SUBROUTINE trc_dms_medusa( chn, chd, mld, xqsr, xdin, xlim, & !! inputs |
---|
47 | & dms_andr, dms_simo, dms_aran, dms_hall, dms_andm) !! outputs |
---|
48 | ! |
---|
49 | !======================================================================= |
---|
50 | !! |
---|
51 | !! Title : Calculates DMS ocean surface concentration |
---|
52 | !! Author : Julien Palmieri and Andrew Yool |
---|
53 | !! Date : 08/08/14 |
---|
54 | !! |
---|
55 | !! DMS module is called in trc_bio's huge jk,jj,ji loop |
---|
56 | !! --> DMS concentration is calculated in a specific cell |
---|
57 | !! (no need of ji,jj,jk) |
---|
58 | !! |
---|
59 | !! AXY (13/03/15): amend to include all four schemes tested |
---|
60 | !! during winter/spring 2015; these are: |
---|
61 | !! |
---|
62 | !! 1. Anderson et al. (2001); this uses fields |
---|
63 | !! of surface chl, irradiance and nutrients |
---|
64 | !! to empirically estimate DMS via a broken |
---|
65 | !! stick approach |
---|
66 | !! |
---|
67 | !! 2. Simo & Dachs (2002); this uses fields of |
---|
68 | !! surface chl and mixed layer depth |
---|
69 | !! |
---|
70 | !! 3. Aranami & Tsunogai (2004); this is an |
---|
71 | !! embellishment of Simo & Dachs |
---|
72 | !! |
---|
73 | !! 4. Halloran et al. (2010); this is an |
---|
74 | !! alternative embellishment of Sim & Dachs |
---|
75 | !! and is included because it is formally |
---|
76 | !! published (and different from the above) |
---|
77 | !! |
---|
78 | !! AXY (25/05/17): add extra "corrected" Anderson scheme |
---|
79 | !! |
---|
80 | !! 5. As Anderson et al. (2001) but modified to |
---|
81 | !! more accurately reflect nutrient limitation |
---|
82 | !! status of phytoplankton community |
---|
83 | !! |
---|
84 | !! AXY (08/07/15): amend to remove Julien's original calculation |
---|
85 | !! as this is now superfluous; the four schemes |
---|
86 | !! are calculated and one is chosen to be passed |
---|
87 | !! to the atmosphere in trc_bio_medusa |
---|
88 | !! |
---|
89 | !======================================================================= |
---|
90 | |
---|
91 | USE yomhook, ONLY: lhook, dr_hook |
---|
92 | USE parkind1, ONLY: jprb, jpim |
---|
93 | |
---|
94 | IMPLICIT NONE |
---|
95 | ! |
---|
96 | REAL(wp), INTENT( in ) :: chn !! non-diatom chlorophyll (mg/m3) |
---|
97 | REAL(wp), INTENT( in ) :: chd !! diatom chlorophyll (mg/m3) |
---|
98 | REAL(wp), INTENT( in ) :: mld !! mix layer depth (m) |
---|
99 | REAL(wp), INTENT( in ) :: xqsr !! surface irradiance (W/m2) |
---|
100 | REAL(wp), INTENT( in ) :: xdin !! surface DIN (mmol N/m3) |
---|
101 | REAL(wp), INTENT( in ) :: xlim !! surface DIN limitation (mmol N/m3) |
---|
102 | REAL(wp), INTENT( inout ) :: dms_andr !! DMS surface concentration (nmol/L) |
---|
103 | REAL(wp), INTENT( inout ) :: dms_simo !! DMS surface concentration (nmol/L) |
---|
104 | REAL(wp), INTENT( inout ) :: dms_aran !! DMS surface concentration (nmol/L) |
---|
105 | REAL(wp), INTENT( inout ) :: dms_hall !! DMS surface concentration (nmol/L) |
---|
106 | REAL(wp), INTENT( inout ) :: dms_andm !! DMS surface concentration (nmol/L) |
---|
107 | ! |
---|
108 | REAL(wp) :: CHL, cmr, sw_dms |
---|
109 | REAL(wp) :: Jterm, Qterm |
---|
110 | !! temporary variables |
---|
111 | REAL(wp) :: fq1,fq2,fq3 |
---|
112 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
---|
113 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
---|
114 | REAL(KIND=jprb) :: zhook_handle |
---|
115 | |
---|
116 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_DMS_MEDUSA' |
---|
117 | |
---|
118 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
---|
119 | |
---|
120 | ! |
---|
121 | !======================================================================= |
---|
122 | ! |
---|
123 | ! AXY (13/03/15): per remarks above, the following calculations estimate |
---|
124 | ! DMS using all of the schemes examined for UKESM1 |
---|
125 | ! |
---|
126 | CHL = 0.0 |
---|
127 | CHL = chn+chd !! mg/m3 |
---|
128 | cmr = CHL / mld |
---|
129 | ! |
---|
130 | ! AXY (13/03/15): Anderson et al. (2001) |
---|
131 | !! JPALM --19-12-2017-- Tunable through the namelist |
---|
132 | !! within dmsmin - dmscut - dmsslp |
---|
133 | Jterm = xqsr + 1.0e-6 |
---|
134 | !! this next line makes a hard-coded assumption about the |
---|
135 | !! half-saturation constant of MEDUSA (which should be |
---|
136 | !! done properly; perhaps even scaled with the proportion |
---|
137 | !! of diatoms and non-diatoms) |
---|
138 | Qterm = xdin / (xdin + 0.5) |
---|
139 | fq1 = log10(CHL * Jterm * Qterm) |
---|
140 | if (fq1 > dmscut) then |
---|
141 | dms_andr = (dmsslp * (fq1 - dmscut)) + dmsmin |
---|
142 | else |
---|
143 | dms_andr = dmsmin |
---|
144 | endif |
---|
145 | ! |
---|
146 | ! AXY (13/03/15): Simo & Dachs (2002) |
---|
147 | fq1 = (-1.0 * log(mld)) + 5.7 |
---|
148 | fq2 = (55.8 * cmr) + 0.6 |
---|
149 | if (cmr < 0.02) then |
---|
150 | dms_simo = fq1 |
---|
151 | else |
---|
152 | dms_simo = fq2 |
---|
153 | endif |
---|
154 | ! |
---|
155 | ! AXY (13/03/15): Aranami & Tsunogai (2004) |
---|
156 | fq1 = 60.0 / mld |
---|
157 | fq2 = (55.8 * cmr) + 0.6 |
---|
158 | if (cmr < 0.02) then |
---|
159 | dms_aran = fq1 |
---|
160 | else |
---|
161 | dms_aran = fq2 |
---|
162 | endif |
---|
163 | ! |
---|
164 | ! AXY (13/03/15): Halloran et al. (2010) |
---|
165 | fq1 = (-1.0 * log(mld)) + 5.7 |
---|
166 | fq2 = (55.8 * cmr) + 0.6 |
---|
167 | fq3 = (90.0 / mld) |
---|
168 | if (cmr < 0.02) then |
---|
169 | dms_hall = fq1 |
---|
170 | else |
---|
171 | dms_hall = fq2 |
---|
172 | endif |
---|
173 | if (mld > 182.5) then |
---|
174 | dms_hall = fq3 |
---|
175 | endif |
---|
176 | ! |
---|
177 | ! AXY (25/05/17): modified Anderson et al. (2001) |
---|
178 | Jterm = xqsr + 1.0e-6 |
---|
179 | !! this version fixes the hard-coded assumption above |
---|
180 | Qterm = xlim |
---|
181 | fq1 = log10(CHL * Jterm * Qterm) |
---|
182 | if (fq1 > 1.72) then |
---|
183 | dms_andm = (8.24 * (fq1 - 1.72)) + 2.29 |
---|
184 | else |
---|
185 | dms_andm = 2.29 |
---|
186 | endif |
---|
187 | |
---|
188 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
---|
189 | END SUBROUTINE trc_dms_medusa |
---|
190 | |
---|
191 | |
---|
192 | !======================================================================= |
---|
193 | !======================================================================= |
---|
194 | !======================================================================= |
---|
195 | |
---|
196 | |
---|
197 | !======================================================================= |
---|
198 | ! |
---|
199 | SUBROUTINE dms_flux_ocn( wind_10m, tstar, dms_conc, i_dms_flux, & !! inputs |
---|
200 | & f_dms ) !! outputs |
---|
201 | ! |
---|
202 | !======================================================================= |
---|
203 | !! |
---|
204 | !! Title : Calculates DMS air-sea exchange |
---|
205 | !! Author : Andrew Yool, based on UKMO original code |
---|
206 | !! Date : 11/10/18 |
---|
207 | !! |
---|
208 | !! Air-sea DMS flux is normally calculated by the UM atmosphere, |
---|
209 | !! as part of its aerosols; however, the OMIP simulation for CMIP6 |
---|
210 | !! is ocean-only and does not include the UM; consequently, this |
---|
211 | !! code has been added to permit ocean-only UKESM1 to produce an |
---|
212 | !! air-sea DMS flux in addition to surface DMS which, hitherto, |
---|
213 | !! was all it would produce; code is largely copy-pasted from the |
---|
214 | !! UKMO original (UM code block is dms_flux_4A.F90); the code |
---|
215 | !! here is hard-wired to use single input values (i.e. not a 2D |
---|
216 | !! area) and make use of the Liss & Merlivat (1986) function |
---|
217 | !! |
---|
218 | !! This DMS function is called from air_sea.F90 |
---|
219 | |
---|
220 | !--------------------------------------------------------------------- |
---|
221 | ! Purpose: To calculate the flux of DMS (as kg m-2 s-1 of sulphur) |
---|
222 | ! from the ocean surface as a function of its concentration |
---|
223 | ! in seawater and of windspeed. The sea-air exchange can |
---|
224 | ! be determined according to one of three commonly-used |
---|
225 | ! parametrization schemes, those of Liss & Merlivat (1986), |
---|
226 | ! Wanninkhof (1992) or Nightingale et al. (2000). The routine |
---|
227 | ! is called by Aero_Ctl. |
---|
228 | ! |
---|
229 | ! Method: The Schmidt number |
---|
230 | ! for DMS is calculated as in Saltzman et al. (1993), and |
---|
231 | ! used with the windspeed to determine the mass transfer (or |
---|
232 | ! "piston") velocity according to the desired parametrization. |
---|
233 | ! This is then used to determine the sea-air mass flux of DMS |
---|
234 | ! as a function of sea-water DMS concentration. High surface |
---|
235 | ! temperatures (caused by the land portion of a gridbox when |
---|
236 | ! coastal tiling is not active) cause negative Sc values which |
---|
237 | ! would give a floating-point error in the k_DMS calculation, |
---|
238 | ! so the Tstar values are capped. This shouldn't be a problem |
---|
239 | ! when coastal tiling is on as then the Tstar values passed in |
---|
240 | ! are those for sea only. |
---|
241 | ! |
---|
242 | ! Code Owner: Please refer to the UM file CodeOwners.txt |
---|
243 | ! This file belongs in section: Aerosols |
---|
244 | ! |
---|
245 | ! Code Description: |
---|
246 | ! Language: Fortran 90 |
---|
247 | ! This code is written to UMDP3 v8 programming standards |
---|
248 | ! |
---|
249 | !--------------------------------------------------------------------- |
---|
250 | |
---|
251 | USE yomhook, ONLY: lhook, dr_hook |
---|
252 | USE parkind1, ONLY: jprb, jpim |
---|
253 | |
---|
254 | IMPLICIT NONE |
---|
255 | ! |
---|
256 | REAL(wp), INTENT( in ) :: wind_10m !! 10m wind (m/s) |
---|
257 | REAL(wp), INTENT( in ) :: tstar !! SST (degrees C) |
---|
258 | REAL(wp), INTENT( in ) :: dms_conc !! surface DMS (nmol / l) |
---|
259 | INTEGER, INTENT(in) :: i_dms_flux !! gas transfer choice |
---|
260 | ! |
---|
261 | REAL(wp), INTENT( inout ) :: f_dms !! DMS flux (kg S m-2 s-1) |
---|
262 | |
---|
263 | ! Local variables: |
---|
264 | REAL :: sc ! Schmidt number |
---|
265 | REAL :: k_dms ! Piston velocity of DMS (cm h-1) |
---|
266 | REAL :: t_c ! Surface temperature in degrees Celsius |
---|
267 | ! Piston velocities for gases with Schmidt numbers of 600 & 660 resp. (cm h-1) |
---|
268 | REAL :: k_600 |
---|
269 | REAL :: k_660 |
---|
270 | REAL :: n ! Schmidt number exponent |
---|
271 | REAL, PARAMETER :: t_max = 47.0 !! Max T to avoid breaking the Sc fit (C) |
---|
272 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
---|
273 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
---|
274 | REAL(KIND=jprb) :: zhook_handle |
---|
275 | |
---|
276 | CHARACTER(LEN=*), PARAMETER :: RoutineName='DMS_FLUX_OCN' |
---|
277 | |
---|
278 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
---|
279 | |
---|
280 | |
---|
281 | ! Calculate the Schmidt number (Sc): |
---|
282 | t_c = MIN(tstar, t_max) |
---|
283 | sc = 2674.0 - (147.12*t_c) + (3.726*t_c**2) & |
---|
284 | - (0.038*t_c**3) |
---|
285 | |
---|
286 | ! Determine the mass transfer (or "piston") velocity (k_DMS) over sea |
---|
287 | ! according to the specified parametrization scheme: |
---|
288 | |
---|
289 | if (i_dms_flux .eq. 1) then |
---|
290 | ! ---------------------------------------------------------------------- |
---|
291 | ! Liss & Merlivat (1986) |
---|
292 | IF (wind_10m .le. 3.6) THEN |
---|
293 | k_600 = 0.17 * wind_10m |
---|
294 | n = -2.0/3.0 |
---|
295 | ELSEIF ( wind_10m .gt. 3.6 .AND. wind_10m .le. 13.0 ) THEN |
---|
296 | k_600 = (2.85 * wind_10m) - 9.65 |
---|
297 | n = -0.5 |
---|
298 | ELSE |
---|
299 | k_600 = (5.90 * wind_10m) - 49.3 |
---|
300 | n = -0.5 |
---|
301 | END IF |
---|
302 | k_dms = k_600 * (sc / 600.0)**n |
---|
303 | elseif (i_dms_flux .eq. 2) then |
---|
304 | ! ---------------------------------------------------------------------- |
---|
305 | ! Wanninkhof (1992) |
---|
306 | k_660 = 0.31 * wind_10m**2 |
---|
307 | n = -0.5 |
---|
308 | k_dms = k_660 * (sc / 660.0)**n |
---|
309 | elseif (i_dms_flux .eq. 3) then |
---|
310 | ! ---------------------------------------------------------------------- |
---|
311 | ! Nightingale et al. (2000) |
---|
312 | k_600 = (0.222 * wind_10m**2) + (0.333 * wind_10m) |
---|
313 | n = -0.5 |
---|
314 | k_dms = k_600 * (sc / 600.0)**n |
---|
315 | else |
---|
316 | ! ---------------------------------------------------------------------- |
---|
317 | ! You shouldn't be here |
---|
318 | k_dms = 0.0 |
---|
319 | endif |
---|
320 | |
---|
321 | ! Finally, calculate the sea-air flux of DMS as a function of k_DMS |
---|
322 | ! and dissolved DMS concentration. The former requires a conversion |
---|
323 | ! from cm hour-1 to ms-1, and the latter from nanomoles per litre to |
---|
324 | ! kg[S] m-3, to return the flux in kg[S] m-2 sec-1. |
---|
325 | |
---|
326 | f_dms = (k_dms / 3.6e5) * (dms_conc * 32.0e-9) |
---|
327 | |
---|
328 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
---|
329 | END SUBROUTINE dms_flux_ocn |
---|
330 | |
---|
331 | |
---|
332 | !======================================================================= |
---|
333 | !======================================================================= |
---|
334 | !======================================================================= |
---|
335 | |
---|
336 | #else |
---|
337 | !!====================================================================== |
---|
338 | !! Dummy module : No MEDUSA bio-model |
---|
339 | !!====================================================================== |
---|
340 | |
---|
341 | CONTAINS |
---|
342 | |
---|
343 | !======================================================================= |
---|
344 | ! |
---|
345 | SUBROUTINE trc_dms_medusa( kt ) !! EMPTY Routine |
---|
346 | ! |
---|
347 | ! |
---|
348 | INTEGER, INTENT( in ) :: kt |
---|
349 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
---|
350 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
---|
351 | REAL(KIND=jprb) :: zhook_handle |
---|
352 | |
---|
353 | CHARACTER(LEN=*), PARAMETER :: RoutineName='TRC_DMS_MEDUSA' |
---|
354 | |
---|
355 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
---|
356 | |
---|
357 | ! |
---|
358 | |
---|
359 | WRITE(*,*) 'trc_dms_medusa: You should not have seen this print! error?' |
---|
360 | |
---|
361 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
---|
362 | END SUBROUTINE trc_dms_medusa |
---|
363 | #endif |
---|
364 | |
---|
365 | !!====================================================================== |
---|
366 | END MODULE trcdms_medusa |
---|
367 | |
---|
368 | |
---|
369 | |
---|