SUBROUTINE dustdevil(ngrid,nlay,nq, pplev,pu,pv,pt, ptsurf,pq2, & pdqdev,pdqs_dev) use tracer_mod, only: alpha_devil use surfdat_h, only: z0_default USE comcstfi_h IMPLICIT NONE c======================================================================= c c c VERSION SPECIAL TRACEURS : c Parameterization of dust devil activities c to estimate dust lifting c The dust devil activity is estimated based on c Renno et al. 1998 (JAS 55, 3244-3252) c c It is proportional to (1-b)*Fs c c With b= [ps**(rcp+1) - ptop**(rcp+1)] / [(ps-ptop)*(rcp+1)* ps**rcp] c with ptop pressure of the top of the boundary layer c rcp = R/cp c c and Fs the surface sensible heat flux = Cd*|U|*(T(1) -Tsurf) c c======================================================================= c----------------------------------------------------------------------- c declarations: c ------------- c arguments: c ---------- INTEGER ngrid,nlay REAL pplev(ngrid,nlay+1) REAL pt(ngrid,nlay) REAL pu(ngrid,nlay) REAL pv(ngrid,nlay) REAL pq2(ngrid,nlay+1) REAL ptsurf(ngrid) c Traceurs : integer nq real pdqdev(ngrid,nlay,nq) real pdqs_dev(ngrid,nq) c local: c ------ INTEGER ig,l,iq real Cd, z1 save Cd LOGICAL firstcall SAVE firstcall REAL devila(ngrid) integer ltop(ngrid) real b,rho,Fs,wind REAL q2top , seuil SAVE q2top , seuil DATA q2top/.5/ ! value of q2 at the top of PBL DATA seuil/.3/ ! value of minimum dust devil activity for dust lifting DATA firstcall/.true./ c TEMPORAIRE AVEC ANLDEVIL : ************* c real b_diag(ngrid) c real localtime(ngrid) c common/temporaire/localtime c real ztop(ngrid),magwind(ngrid),t1(ngrid) c real rcp ,cpp c rcp = kappa c cpp = r/rcp c ********************************** c----------------------------------------------------------------------- c initialisation c -------------- IF (firstcall) THEN write(*,*) 'In dustdevil :' write(*,*) ' q2top= ',q2top,' seuil= ', seuil c A rough estimation of the horizontal drag coefficient Cd c (the scale heigh is taken to be 13 km since we are typically c dealing with daytime temperature around 250K. c z1= -0.5*13.e3*log(pplev(1,2)/pplev(1,1)) Cd = (0.4/log(z1/z0_default))**2 firstcall=.false. c Temporaire c open(77,file='devil') ENDIF c----------------------------------------------------------------------- c Initialisation do iq=1,nq do l=1,nlay do ig=1,ngrid pdqdev(ig,l,iq)= 0 end do end do end do c----------------------------------------------------------------------- c Determining the top of the boundary layer c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ do ig=1,ngrid do l=2,nlay-1 if (pq2(ig,l).lt.q2top)then ltop(ig)=l goto 99 end if enddo 99 continue c *************************************** cc if (ptsurf(ig).gt.255)then c write(*,*) 'tsurf, ztop (km): ', ig, c & ptsurf(ig), -12.*log(pplev(ig,ltop(ig))/pplev(ig,1)) c if ((ptsurf(ig).gt.50.).and.( c & (-12.*log(pplev(ig,ltop(ig))/pplev(ig,1))).gt.60.))then c do l=1,nlay c write(*,*) l, c & -12.*log(pplev(ig,l)/pplev(ig,1)),pq2(ig,l) c end do c end if cc end if c *************************************** enddo c *************************************** c do ig=100,148 c write(*,*)'time,tsurf,ztop', localtime(ig),ptsurf(ig), c & -12.*log(pplev(ig,ltop(ig))/pplev(ig,1)) c end do c *************************************** c Calculation : dust devil intensity c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ do ig=1,ngrid c -------------------------------------------------- c 1) Version 1 : sensible heat flux using actual wind : c Wind magnitude: c wind = sqrt(pu(ig,1)**2+pv(ig,1)**2) c c -------------------------------------------------- c 2) Version 2 : sensible heat flux using wind = 15 m/s wind = 15. c ---------------------------------------------------- c Density : rho=pplev(ig,1)/(R*pt(ig,1)) c Sensible heat flux (W.m-2) (>0 if up) Fs= rho*cpp*Cd * wind & * (ptsurf(ig) -pt(ig,1)) b= (pplev(ig,1)**(rcp+1) - pplev(ig,ltop(ig))**(rcp+1)) / & ( (pplev(ig,1)-pplev(ig,ltop(ig)))*(rcp+1)*pplev(ig,1)**rcp) c b_diag(ig) = b ! TEMPORAIRE (pour diagnostique) c Energy flux available to drive dust devil (W.m-2) : (1-b)*Fs c Dust devil activity : devila(ig)= max( 0. , (1-b)*Fs - seuil ) enddo c c lifted dust (kg m-2 s-1) (<0 when lifting) c ~~~~~~~~~~ do iq=1,nq do ig=1,ngrid pdqs_dev(ig,iq)= - alpha_devil(iq) * devila(ig) end do end do c Injection of dust in the atmosphere (up to the top of pbl) c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ do iq=1,nq do ig=1,ngrid if (devila(ig).ne.0.) then do l=1,ltop(ig) pdqdev(ig,l,iq)=-pdqs_dev(ig,iq)*g/ & (pplev(ig,1)-pplev(ig,ltop(ig))) end do end if end do end do c ********************************************************* c TEMPORAIRE AVEC ANLDEVIL: c IF (ngrid.gt.1) THEN c do ig=2,ngrid-1 c write(77,88) lati(ig)*180./pi,localtime(ig), c & -12.*log(pplev(ig,ltop(ig))/pplev(ig,1)), c & devil(ig),min(sqrt(pu(ig,1)**2+pv(ig,1)**2),40.), c & ptsurf(ig)-pt(ig,1),ptsurf(ig),pplev(ig,1) c end do c88 format (f7.3,1x,f7.3,1x,f6.3,1x,f6.4,1x,f7.4,1x, c & f7.3,1x,f7.3,1x,f9.3) c do ig=1,ngrid c ztop(ig) = -12.*log(pplev(ig,ltop(ig))/pplev(ig,1)) c magwind(ig) = sqrt(pu(ig,1)**2+pv(ig,1)**2) c t1(ig) =max(ptsurf(ig)- pt(ig,1),0.) c end do c call WRITEDIAGFI(ngrid,'dqs_dev','dqs devil', c & 'kg.m-2.s-1',2,pdqs_dev) c call WRITEDIAGFI(ngrid,'wind','wind', c & 'm.s-1',2,magwind) c call WRITEDIAGFI(ngrid,'ztop','top pbl', c & 'km',2,ztop) c call WRITEDIAGFI(ngrid,'tsurf','tsurf', c & 'K',2,ptsurf) c call WRITEDIAGFI(ngrid,'T1','T(1)', c & 'K',2,t1) c call WRITEDIAGFI(ngrid,'b','b', c & ' ',2,b_diag) c END If c ********************************************************* RETURN END