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diahth.F90 in NEMO/releases/release-4.0/src/OCE/DIA – NEMO

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source: NEMO/releases/release-4.0/src/OCE/DIA/diahth.F90 @ 11097

Last change on this file since 11097 was 11097, checked in by agn, 5 years ago
corrected . or. byg in diahth.F90
Property svn:keywords set to `Id`
File size: 17.1 KB

Rev	Line
[3]	1	MODULE diahth
	2	!!======================================================================
	3	!! * MODULE diahth *
	4	!! Ocean diagnostics: thermocline and 20 degree depth
	5	!!======================================================================
[1485]	6	!! History : OPA ! 1994-09 (J.-P. Boulanger) Original code
[11091]	7	!! ! 1996-11 (E. Guilyardi) OPA8
[1485]	8	!! ! 1997-08 (G. Madec) optimization
[11091]	9	!! ! 1999-07 (E. Guilyardi) hd28 + heat content
[5836]	10	!! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module
	11	!! 3.2 ! 2009-07 (S. Masson) hc300 bugfix + cleaning + add new diag
[1485]	12	!!----------------------------------------------------------------------
[3]	13	!!----------------------------------------------------------------------
	14	!! 'key_diahth' : thermocline depth diag.
	15	!!----------------------------------------------------------------------
[1577]	16	!! dia_hth : Compute varius diagnostics associated with the mixed layer
[3]	17	!!----------------------------------------------------------------------
	18	USE oce ! ocean dynamics and tracers
	19	USE dom_oce ! ocean space and time domain
	20	USE phycst ! physical constants
[6140]	21	!
[3]	22	USE in_out_manager ! I/O manager
[2715]	23	USE lib_mpp ! MPP library
[2528]	24	USE iom ! I/O library
[3]	25
	26	IMPLICIT NONE
	27	PRIVATE
	28
[2715]	29	PUBLIC dia_hth ! routine called by step.F90
[11091]	30	PUBLIC dia_hth_init ! routine called by nemogcm.F90
[3]	31
[11096]	32	LOGICAL, PUBLIC :: ll_diahth !: Compute further diagnostics of ML and thermocline depth
[11091]	33
[3]	34	!!----------------------------------------------------------------------
[9598]	35	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[1152]	36	!! $Id$
[10068]	37	!! Software governed by the CeCILL license (see ./LICENSE)
[3]	38	!!----------------------------------------------------------------------
	39	CONTAINS
	40
[2715]	41
[3]	42	SUBROUTINE dia_hth( kt )
[11090]	43	!!---------------------------------------------------------------------
	44	!! * ROUTINE dia_hth *
	45	!!
	46	!! ** Purpose : Computes
	47	!! the mixing layer depth (turbocline): avt = 5.e-4
	48	!! the depth of strongest vertical temperature gradient
	49	!! the mixed layer depth with density criteria: rho = rho(10m or surf) + 0.03(or 0.01)
[11091]	50	!! the mixed layer depth with temperature criteria: abs( tn - tn(10m) ) = 0.2
	51	!! the top of the thermochine: tn = tn(10m) - ztem2
	52	!! the pycnocline depth with density criteria equivalent to a temperature variation
	53	!! rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC)
[11090]	54	!! the barrier layer thickness
	55	!! the maximal verical inversion of temperature and its depth max( 0, max of tn - tn(10m) )
	56	!! the depth of the 20 degree isotherm (linear interpolation)
	57	!! the depth of the 28 degree isotherm (linear interpolation)
	58	!! the heat content of first 300 m
	59	!!
[11091]	60	!! ** Method :
[11090]	61	!!-------------------------------------------------------------------
	62	INTEGER, INTENT( in ) :: kt ! ocean time-step index
	63	!!
	64	INTEGER :: ji, jj, jk ! dummy loop arguments
	65	INTEGER :: iid, ilevel ! temporary integers
[11091]	66	INTEGER, DIMENSION(jpi,jpj) :: ik20, ik28 ! levels
[11090]	67	REAL(wp) :: zavt5 = 5.e-4_wp ! Kz criterion for the turbocline depth
	68	REAL(wp) :: zrho3 = 0.03_wp ! density criterion for mixed layer depth
	69	REAL(wp) :: zrho1 = 0.01_wp ! density criterion for mixed layer depth
	70	REAL(wp) :: ztem2 = 0.2_wp ! temperature criterion for mixed layer depth
	71	REAL(wp) :: zthick_0, zcoef ! temporary scalars
	72	REAL(wp) :: zztmp, zzdep ! temporary scalars inside do loop
	73	REAL(wp) :: zu, zv, zw, zut, zvt ! temporary workspace
[11091]	74	REAL(wp), DIMENSION(jpi,jpj) :: zabs2 ! MLD: abs( tn - tn(10m) ) = ztem2
	75	REAL(wp), DIMENSION(jpi,jpj) :: ztm2 ! Top of thermocline: tn = tn(10m) - ztem2
	76	REAL(wp), DIMENSION(jpi,jpj) :: zrho10_3 ! MLD: rho = rho10m + zrho3
	77	REAL(wp), DIMENSION(jpi,jpj) :: zpycn ! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC)
	78	REAL(wp), DIMENSION(jpi,jpj) :: ztinv ! max of temperature inversion
	79	REAL(wp), DIMENSION(jpi,jpj) :: zdepinv ! depth of temperature inversion
	80	REAL(wp), DIMENSION(jpi,jpj) :: zrho0_3 ! MLD rho = rho(surf) = 0.03
	81	REAL(wp), DIMENSION(jpi,jpj) :: zrho0_1 ! MLD rho = rho(surf) = 0.01
	82	REAL(wp), DIMENSION(jpi,jpj) :: zmaxdzT ! max of dT/dz
	83	REAL(wp), DIMENSION(jpi,jpj) :: zthick ! vertical integration thickness
	84	REAL(wp), DIMENSION(jpi,jpj) :: zdelr ! delta rho equivalent to deltaT = 0.2
	85	! note: following variables should move to local variables once iom_put is always used
	86	REAL(wp), DIMENSION(jpi,jpj) :: zhth !: depth of the max vertical temperature gradient [m]
	87	REAL(wp), DIMENSION(jpi,jpj) :: zhd20 !: depth of 20 C isotherm [m]
	88	REAL(wp), DIMENSION(jpi,jpj) :: zhd28 !: depth of 28 C isotherm [m]
	89	REAL(wp), DIMENSION(jpi,jpj) :: zhtc3 !: heat content of first 300 m [W]
[3]	90
[11096]	91	IF (iom_use("mlddzt") .OR. iom_use("mldr0_3") .OR. iom_use("mldr0_1")) THEN
[11091]	92	! ------------------------------------------------------------- !
	93	! thermocline depth: strongest vertical gradient of temperature !
	94	! turbocline depth (mixing layer depth): avt = zavt5 !
	95	! MLD: rho = rho(1) + zrho3 !
	96	! MLD: rho = rho(1) + zrho1 !
	97	! ------------------------------------------------------------- !
	98	zmaxdzT(:,:) = 0._wp
	99	IF( nla10 > 1 ) THEN
[11090]	100	DO jj = 1, jpj
	101	DO ji = 1, jpi
[11091]	102	zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1)
[11090]	103	zrho0_3(ji,jj) = zztmp
	104	zrho0_1(ji,jj) = zztmp
[11091]	105	zhth(ji,jj) = zztmp
[11090]	106	END DO
	107	END DO
[11091]	108	ELSE IF (iom_use("mlddzt")) THEN
	109	DO jj = 1, jpj
	110	DO ji = 1, jpi
	111	zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1)
	112	zhth(ji,jj) = zztmp
	113	END DO
	114	END DO
	115	ELSE
	116	zhth(:,:) = 0._wp
[11094]	117
[11090]	118	ENDIF
[3]	119
[11090]	120	DO jk = jpkm1, 2, -1 ! loop from bottom to 2
	121	DO jj = 1, jpj
	122	DO ji = 1, jpi
	123	!
	124	zzdep = gdepw_n(ji,jj,jk)
	125	zztmp = ( tsn(ji,jj,jk-1,jp_tem) - tsn(ji,jj,jk,jp_tem) ) / zzdep * tmask(ji,jj,jk) ! vertical gradient of temperature (dT/dz)
	126	zzdep = zzdep * tmask(ji,jj,1)
[1577]	127
[11091]	128	IF( zztmp > zmaxdzT(ji,jj) ) THEN
[11090]	129	zmaxdzT(ji,jj) = zztmp ; zhth (ji,jj) = zzdep ! max and depth of dT/dz
	130	ENDIF
[1577]	131
[11091]	132	IF( nla10 > 1 ) THEN
[11090]	133	zztmp = rhop(ji,jj,jk) - rhop(ji,jj,1) ! delta rho(1)
	134	IF( zztmp > zrho3 ) zrho0_3(ji,jj) = zzdep ! > 0.03
	135	IF( zztmp > zrho1 ) zrho0_1(ji,jj) = zzdep ! > 0.01
	136	ENDIF
[1577]	137
[11090]	138	END DO
	139	END DO
	140	END DO
[1577]	141
[11090]	142	IF (iom_use("mlddzt")) CALL iom_put( "mlddzt", zhth*tmask(:,:,1) ) ! depth of the thermocline
[11091]	143	IF( nla10 > 1 ) THEN
[11090]	144	IF (iom_use("mldr0_3")) CALL iom_put( "mldr0_3", zrho0_3*tmask(:,:,1) ) ! MLD delta rho(surf) = 0.03
	145	IF (iom_use("mldr0_1")) CALL iom_put( "mldr0_1", zrho0_1*tmask(:,:,1) ) ! MLD delta rho(surf) = 0.01
	146	ENDIF
	147	ENDIF
[3]	148
[11096]	149	IF (iom_use("mld_dt02") .OR. iom_use("topthdep") .OR. iom_use("mldr10_3") .OR. &
	150	& iom_use("pycndep") .OR. iom_use("tinv") .OR. iom_use("depti")) THEN
[11091]	151	DO jj = 1, jpj
	152	DO ji = 1, jpi
	153	zztmp = gdepw_n(ji,jj,mbkt(ji,jj)+1)
	154	zabs2 (ji,jj) = zztmp
	155	ztm2 (ji,jj) = zztmp
	156	zrho10_3(ji,jj) = zztmp
	157	zpycn (ji,jj) = zztmp
	158	END DO
	159	END DO
	160	ztinv (:,:) = 0._wp
	161	zdepinv(:,:) = 0._wp
	162
[11090]	163	IF (iom_use("pycndep")) THEN
	164	! Preliminary computation
	165	! computation of zdelr = (dr/dT)(T,S,10m)*(-0.2 degC)
	166	DO jj = 1, jpj
	167	DO ji = 1, jpi
	168	IF( tmask(ji,jj,nla10) == 1. ) THEN
	169	zu = 1779.50 + 11.250 * tsn(ji,jj,nla10,jp_tem) - 3.80 * tsn(ji,jj,nla10,jp_sal) &
	170	& - 0.0745 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem) &
	171	& - 0.0100 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_sal)
	172	zv = 5891.00 + 38.000 * tsn(ji,jj,nla10,jp_tem) + 3.00 * tsn(ji,jj,nla10,jp_sal) &
	173	& - 0.3750 * tsn(ji,jj,nla10,jp_tem) * tsn(ji,jj,nla10,jp_tem)
	174	zut = 11.25 - 0.149 * tsn(ji,jj,nla10,jp_tem) - 0.01 * tsn(ji,jj,nla10,jp_sal)
	175	zvt = 38.00 - 0.750 * tsn(ji,jj,nla10,jp_tem)
	176	zw = (zu + 0.698zv) (zu + 0.698*zv)
	177	zdelr(ji,jj) = ztem2 * (1000.(zutzv - zvt*zu)/zw)
	178	ELSE
	179	zdelr(ji,jj) = 0._wp
	180	ENDIF
	181	END DO
	182	END DO
[11091]	183	ELSE
	184	zdelr(:,:) = 0._wp
[11090]	185	ENDIF
[1577]	186
[11090]	187	! ------------------------------------------------------------- !
	188	! MLD: abs( tn - tn(10m) ) = ztem2 !
	189	! Top of thermocline: tn = tn(10m) - ztem2 !
	190	! MLD: rho = rho10m + zrho3 !
	191	! pycnocline: rho = rho10m + (dr/dT)(T,S,10m)*(-0.2 degC) !
	192	! temperature inversion: max( 0, max of tn - tn(10m) ) !
	193	! depth of temperature inversion !
	194	! ------------------------------------------------------------- !
	195	DO jk = jpkm1, nlb10, -1 ! loop from bottom to nlb10
	196	DO jj = 1, jpj
	197	DO ji = 1, jpi
	198	!
	199	zzdep = gdepw_n(ji,jj,jk) * tmask(ji,jj,1)
	200	!
	201	zztmp = tsn(ji,jj,nla10,jp_tem) - tsn(ji,jj,jk,jp_tem) ! - delta T(10m)
	202	IF( ABS(zztmp) > ztem2 ) zabs2 (ji,jj) = zzdep ! abs > 0.2
	203	IF( zztmp > ztem2 ) ztm2 (ji,jj) = zzdep ! > 0.2
	204	zztmp = -zztmp ! delta T(10m)
	205	IF( zztmp > ztinv(ji,jj) ) THEN ! temperature inversion
	206	ztinv(ji,jj) = zztmp ; zdepinv (ji,jj) = zzdep ! max value and depth
	207	ENDIF
[1577]	208
[11090]	209	zztmp = rhop(ji,jj,jk) - rhop(ji,jj,nla10) ! delta rho(10m)
	210	IF( zztmp > zrho3 ) zrho10_3(ji,jj) = zzdep ! > 0.03
	211	IF( zztmp > zdelr(ji,jj) ) zpycn (ji,jj) = zzdep ! > equi. delta T(10m) - 0.2
	212	!
	213	END DO
	214	END DO
	215	END DO
[1577]	216
[11090]	217	IF (iom_use("mld_dt02")) CALL iom_put( "mld_dt02", zabs2*tmask(:,:,1) ) ! MLD abs(delta t) - 0.2
	218	IF (iom_use("topthdep")) CALL iom_put( "topthdep", ztm2*tmask(:,:,1) ) ! T(10) - 0.2
	219	IF (iom_use("mldr10_3")) CALL iom_put( "mldr10_3", zrho10_3*tmask(:,:,1) ) ! MLD delta rho(10m) = 0.03
	220	IF (iom_use("pycndep")) CALL iom_put( "pycndep" , zpycn*tmask(:,:,1) ) ! MLD delta rho equi. delta T(10m) = 0.2
[11091]	221	IF (iom_use("tinv")) CALL iom_put( "tinv" , ztinv*tmask(:,:,1) ) ! max. temp. inv. (t10 ref)
	222	IF (iom_use("depti")) CALL iom_put( "depti" , zdepinv*tmask(:,:,1) ) ! depth of max. temp. inv. (t10 ref)
[11090]	223	ENDIF
[1577]	224
[11096]	225	IF(iom_use("20d") .OR. iom_use("28d")) THEN
[11090]	226	! ----------------------------------- !
	227	! search deepest level above 20C/28C !
	228	! ----------------------------------- !
	229	ik20(:,:) = 1
	230	ik28(:,:) = 1
	231	DO jk = 1, jpkm1 ! beware temperature is not always decreasing with depth => loop from top to bottom
	232	DO jj = 1, jpj
	233	DO ji = 1, jpi
	234	zztmp = tsn(ji,jj,jk,jp_tem)
	235	IF( zztmp >= 20. ) ik20(ji,jj) = jk
	236	IF( zztmp >= 28. ) ik28(ji,jj) = jk
	237	END DO
	238	END DO
	239	END DO
[3]	240
[11090]	241	! --------------------------- !
	242	! Depth of 20C/28C isotherm !
	243	! --------------------------- !
	244	DO jj = 1, jpj
	245	DO ji = 1, jpi
	246	!
	247	zzdep = gdepw_n(ji,jj,mbkt(ji,jj)+1) ! depth of the oean bottom
	248	!
	249	iid = ik20(ji,jj)
[11091]	250	IF( iid /= 1 ) THEN
[11090]	251	zztmp = gdept_n(ji,jj,iid ) & ! linear interpolation
	252	& + ( gdept_n(ji,jj,iid+1) - gdept_n(ji,jj,iid) ) &
	253	& * ( 20.*tmask(ji,jj,iid+1) - tsn(ji,jj,iid,jp_tem) ) &
	254	& / ( tsn(ji,jj,iid+1,jp_tem) - tsn(ji,jj,iid,jp_tem) + (1.-tmask(ji,jj,1)) )
	255	zhd20(ji,jj) = MIN( zztmp , zzdep) * tmask(ji,jj,1) ! bound by the ocean depth
[11091]	256	ELSE
[11090]	257	zhd20(ji,jj) = 0._wp
	258	ENDIF
	259	!
	260	iid = ik28(ji,jj)
[11091]	261	IF( iid /= 1 ) THEN
[11090]	262	zztmp = gdept_n(ji,jj,iid ) & ! linear interpolation
	263	& + ( gdept_n(ji,jj,iid+1) - gdept_n(ji,jj,iid) ) &
	264	& * ( 28.*tmask(ji,jj,iid+1) - tsn(ji,jj,iid,jp_tem) ) &
	265	& / ( tsn(ji,jj,iid+1,jp_tem) - tsn(ji,jj,iid,jp_tem) + (1.-tmask(ji,jj,1)) )
	266	zhd28(ji,jj) = MIN( zztmp , zzdep ) * tmask(ji,jj,1) ! bound by the ocean depth
[11091]	267	ELSE
[11090]	268	zhd28(ji,jj) = 0._wp
	269	ENDIF
[3]	270
[11090]	271	END DO
	272	END DO
	273	CALL iom_put( "20d", zhd20 ) ! depth of the 20 isotherm
	274	CALL iom_put( "28d", zhd28 ) ! depth of the 28 isotherm
	275	ENDIF
	276
	277	! ----------------------------- !
	278	! Heat content of first 300 m !
	279	! ----------------------------- !
	280	IF (iom_use("hc300")) THEN
	281	! find ilevel with (ilevel+1) the deepest W-level above 300m (we assume we can use e3t_1d to do this search...)
	282	ilevel = 0
	283	zthick_0 = 0._wp
[11091]	284	DO jk = 1, jpkm1
[11090]	285	zthick_0 = zthick_0 + e3t_1d(jk)
	286	IF( zthick_0 < 300. ) ilevel = jk
	287	END DO
	288	! surface boundary condition
[11091]	289	IF( ln_linssh ) THEN ; zthick(:,:) = sshn(:,:) ; zhtc3(:,:) = tsn(:,:,1,jp_tem) * sshn(:,:) * tmask(:,:,1)
	290	ELSE ; zthick(:,:) = 0._wp ; zhtc3(:,:) = 0._wp
[11090]	291	ENDIF
	292	! integration down to ilevel
	293	DO jk = 1, ilevel
	294	zthick(:,:) = zthick(:,:) + e3t_n(:,:,jk)
	295	zhtc3 (:,:) = zhtc3 (:,:) + e3t_n(:,:,jk) * tsn(:,:,jk,jp_tem) * tmask(:,:,jk)
	296	END DO
	297	! deepest layer
	298	zthick(:,:) = 300. - zthick(:,:) ! remaining thickness to reach 300m
	299	DO jj = 1, jpj
	300	DO ji = 1, jpi
	301	zhtc3(ji,jj) = zhtc3(ji,jj) + tsn(ji,jj,ilevel+1,jp_tem) &
	302	& * MIN( e3t_n(ji,jj,ilevel+1), zthick(ji,jj) ) * tmask(ji,jj,ilevel+1)
	303	END DO
	304	END DO
	305	! from temperature to heat contain
	306	zcoef = rau0 * rcp
	307	zhtc3(:,:) = zcoef * zhtc3(:,:)
	308	CALL iom_put( "hc300", zhtc3*tmask(:,:,1) ) ! first 300m heat content
	309	ENDIF
	310	!
[3]	311	END SUBROUTINE dia_hth
	312
	313
[11091]	314	SUBROUTINE dia_hth_init
	315	!!---------------------------------------------------------------------------
	316	!! * ROUTINE dia_hth_init *
	317	!!
	318	!! ** Purpose: Initialization for ML and thermocline depths
	319	!!
[11096]	320	!! ** Action : If any upper ocean diagnostic required by xml file, set in dia_hth
[11091]	321	!!---------------------------------------------------------------------------
	322	!
	323	IF(lwp) THEN
	324	WRITE(numout,*)
	325	WRITE(numout,*) 'dia_hth_init : heat and salt budgets diagnostics'
	326	WRITE(numout,*) '~~~~~~~~~~~~ '
	327	ENDIF
[11096]	328	ll_diahth = iom_use("mlddzt") .OR. iom_use("mldr0_3") .OR. iom_use("mldr0_1") .OR. &
	329	& iom_use("mld_dt02") .OR. iom_use("topthdep") .OR. iom_use("mldr10_3") .OR. &
[11097]	330	& iom_use("pycndep") .OR. iom_use("tinv") .OR. iom_use("depti").OR. &
[11096]	331	& iom_use("20d") .OR. iom_use("28d") .OR. iom_use("hc300")
[11091]	332	IF(lwp) THEN
[11096]	333	WRITE(numout,*) ' output upper ocean diagnostics (T) or not (F) ll_diahth = ', ll_diahth
[11091]	334	ENDIF
	335	!
	336	END SUBROUTINE dia_hth_init
[3]	337	END MODULE diahth

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