On the use of the GPCI for the tuning and the validation of the new ARPEGE GCM’s physics GCSS-GPCI / BLCL-RICO 18-21 sept 2006 P. Marquet, CNRM. Toulouse.

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On the use of the GPCI for the tuning and the validation of the new ARPEGE GCM’s physics GCSS-GPCI / BLCL-RICO sept 2006 P. Marquet, CNRM. Toulouse. Météo-France. (20-sept-2006) + ARPEGE CLIMATE & N.W.P. team + Meso-Scale CNRM team + ENM (School of Met.) + CERFACS + IPSL-LMD …

Introduction The aim of the study :  Run the French Météo-France (CNRM) ARPEGE-CLIMAT GCM (T63-L31) for GEWEX-PCI (STD / NEW1 / NEW2) …  Send the results for the inter-comparison : done / Joao … + Impact studies :  Test of STANDARD versus NEW physics (Turb, Conv,  -Phys)  Comparisons with the previous EPCI ; with the AMMA-CI…  Impact of the explicit Top PBL entrainment ?  Comparisons with SCM cases ?

The Climate ARPEGE physics : STANDARD / NEW1 / NEW2 STANDARD / V3-V4NEW1 / mixed / NEW2 / IPCC / full-Diagnostic Diag+Prog full-Prognostic TURBDIAG. Mellor-YamadaDIAG. M&YPROGN. / C.B.R.  e /  t = 0  e /  t = 0  e /  t = P + Dif – Dis moist PDF / Bougeaultmoist PDF / moist PDF / Bougeault Bougeault / Bechtold Micro-PhysDIAG. PROGN. PROGN. Smith/KesslerSmith/Kessler Bulk - Lopez q_liq / q_ice q_liq / q_ice q_cloud / q_rain Shallow part in TURB, but why ?Mass-Flux Mass-Flux Convection + Mass-Flux Bougeault ?CAPE / Germy CAPE / Gueremy DeepMass-Flux / BougeaultMass-FluxMass-Flux ConvectionConvergence of HUCAPE / Gueremy CAPE / Gueremy Top-PBLNO YES YES EntrainmentGrenier & Breth. Grenier & Breth.

Sc/St Cu Cb Equator 1st Cross Section 2nd Cross Section U.S.A GPCI = Gewex Pacific Cross-section Intercomparison GCM runs Arpege / V4.5 : 2 years : 1998 and days of spin-up in June (lost) + JJA every 3 h NEW1 : TKE-GY +  -phys-GY + CVGY + LPBLE / or not NEW2 : TKE-CBR + LOPEZ + CVGY + LPBLE / or not

(a) I.W.V. EPCI = Eurocs Pacific Cross-section Intercomparison (c) C. C. (diag) (b) L.W.P. (diag) Versus : SCM / EUROCS Cumulus (L40)

EPCI = Eurocs Pacific Cross-section Intercomparison ArpegeMPI ECMWF JMAMetORACMO HIRLAM KF HIRLAM ST ERA (3-6h) Cloud Cover

EPCI = Eurocs Pacific Cross-section Intercomparison ARPEGE-V3 ANA-ECMWF Met-Office Cloud Cover

GPCI = Gewex Pacific Cross-section Intercomparison ANA-ECMWF ARPEGE-V3 ARP-V4-STD ARP-NEW2 + LPBLE Cloud Cover

GPCI = Gewex Pacific Cross-section Intercomparison Cloud Cover More realistic results with NEW2 + LPBLE : Top-PBL Entrainment = OK  RICO ? ARP-NEW2 + LPBLE ARP-NEW2 ANA-ECMWF

RICO L31 (GCM) Cloud Cover NEW2_noentNEW2

GPCI = Gewex Pacific Cross-section Intercomparison ARP-STD Athens (2005) : Pb OMEGA (Pa/s) !! ARP-NEW2 More realistic results with NEW2 (+ LPBLE) ARP-NEW2 + LPBLE

GPCI = Gewex Pacific Cross-section Intercomparison K6 = ARP-NEW2 V4 = ARP-STD K4 = ARP-NEW2 + LPBLE I.W.V. EPCI No more >0 biases with NEW2… (b).W.P. but a <0 one !!   RICO ? ARP-STD ARP-NEW2 + LPBLE GPCI

NEW2 NEW2_noent [ T  ] & [ q_v  ] => [ RH  ] ? RICO L31 (GCM) RELAT. HUM. STD

GPCI = Gewex Pacific Cross-section Intercomparison K6 = ARP-NEW2 V4 = ARP-STD L.W.P. K4 = ARP-NEW2 + LPBLE L.W.P. EPCI NEW2 : better than STD-V4 NEW2 with LPBLE even better… ARP-STD ARP-NEW2 + LPBLE ARP-NEW2 GPCI ARP-NEW2 + LPBLE

GPCI = Gewex Pacific Cross-section Intercomparison K6 = ARP-NEW2 V4 = ARP-STD Cloud Cover Less >0 biases with NEW2 K4 = ARP-NEW2 + LPBLE C. C. Less <0 biases with NEW2 + LBLPE EPCI ARP-STD ARP-NEW2 + LPBLE GPCI

AMMA = African Monsoon Multidisciplinary Analysis CROSS : 20S-40N average over : 10W-10E MAP-2D : the points located within: 10S-30N 35W-30E

Cross-Section AMMA GCM runs Arpege / V4.5 : CNRM/EAC + ENM/UFR 2 years : 2000 (dry) and 2003 (moist) + one year (lost) of spin-up (1999 et 2002) NEW1 : TKE-GY +  -phys-GY + CVGY + LPBLE / or not NEW2 : TKE-CBR + LOPEZ + CVGY + LPBLE / or not SST : Reynolds OI-v2 (daily interpolations) Altitude + Surf : a standard ARPEGE state (not ERA40) Aerosols : FMR(15) + Tegen < GMAP < CEPMMT Output :  t=3h / NetCdF (similar to EPCI/GPCI)

3D Simulations + transect : impact of the Top PBL l’entrainment. “NEW2” Prognostic Physics : TKE-CBR + Lopez + CVs-GY (1) Better simulations of SC/Cu over the Golf of Guynea if LPBLE=.TRUE. … more low level clouds, at least… but ? LPBLE = F LPBLE = T

3D Simulations + transect : impact of the Top PBL l’entrainment. “NEW2” Prognostic Physics : TKE-CBR + Lopez + CVs-GY (2) More realistic indeed with LPBLE=TRUE “Omega” : Re-analysis NMC : LPBLE = T LPBLE = F

Conclusions Results  An (internal) validation of the ARPEGE physics…  An improvement with Top PBL entr. and with the new convection and the new micro-physics…  A real interest for the GPCI ; but jointly with SCM and GCM global analyses : the EUROCS’ method…  Problems with the diurnal cycle ?  Validation of Cloud Cover (Obs. / Ana.) ? => Radiation !  Results for “T”, “q_v” and “q_l”… but for the wind ? for R.H. ? Questions :