2006/12/29. MISMO workshop Yokohama, 25 November, 2008
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1 Global cloud-resolving simulations of MJO events in November January multiscale structure /12/29 MTSAT-1R NICAM Tomoe NASUNO, Masaki SATOH, Hiroaki MIURA, NICAM development group FRCGC, JAMSTEC MISMO workshop Yokohama, 25 November, 2008
2 Capability of global cloud-resolving simulations Explicit i representation of Multi-scale, Multi-process, Cross-latitudinal interactions Storm track Diurnal variation over maritime continent Indian dipole /ENSO Tropical cyclogenesis Madden-Julian Oscillation Australian Monsoon Equatorial waves NICAM 3.5-km mesh 29 Dec. 2006
3 NICAM 3.5-km mesh Aquaplanet case Cloud top height (km) Temperature z = 2m Cold pools, downdrafts Cloud water Content (g/kg) z = 1k km
4 Experimental setup (an MJO event Dec.2006-Jan.2007) Horizontal mesh size: 14 km, 7 km, 3.5 km Vertical domain: 0 m ~ 38,000 m, 40-levels l (stretch t grid) Initial conditions: NCEP tropospheric analyses data (6 hourly, 1.0x1.0 degree grids) :00:00 (14- and 7-km run) 1-month integration :00:00 (3.5-km run) 7-day integration Boundary conditions: Reynolds SST, Sea ICE (weekly data) ETOPO-5 topography, Matthews vegetation UGAMP ozone climatology (for AMPI2) Miura et al. 2007; An Madden-Julian Oscillation event simulated using a global lcloud-resolving l model. Science, 318, 1763(2007); doi: /science start end MISMO field observation Onset of Australian Monsoon by Dr. Wheeler (BMRC) matw/maproom/olr_modes/h.6.all.eq.html /OLR /h h
5 NOAA OLR MTSAT TBB NICAM dx=3.5 km 25 Dec Jan NICAM dx=14 km MTSAT (T.Nakazawa) 15 Dec Dec NICAM dx=7 km 15 Jan Jan. 2007
6 References (Nov 2006-Jan 2007 simulations) Miura, H., M. Satoh, T. Nasuno, A. T. Noda, and K. Oouchi, 2007: An Madden-Julian Oscillation event simulated using a global cloud-resolving model. Science, 318, : overview Satoh, M., 2008: Numerical simulations of heavy rainfalls by a global cloud-resolving model. J. Disaster Research, 3, : overview, diurnal cycle Inoue, T., M. Satoh, H. Miura, and B. Mapes, 2008: Characteristics of cloud size of deep convection simulated by a global cloud resolving model over the western tropical Pacific. J. Meteor. Soc. Japan, in press. : cluster size distribution ( vs. MTSAT) Masunaga, H., M. Satoh, and H. Miura, 2008: A joint satellite and global CRM analysis of an MJO event: Model diagnosis. J. Geophys. Res., 113, D17210, doi: /2008jd : condensates (vs. TRMM, CloudSat/CALIPSO) Fudeyasu, H., Y. Wang, M. Satoh, T. Nasuno, H. Miura, and W. Yanase, 2008: The global cloud-system-resolving model NICAM successfully simulated the lifecycles of two real tropical cyclones. Geophys. Res. Lett., in press : TC formation and lifecycles Nasuno, T., H. Miura, M. Satoh, A. T. Noda, and K. Ouchi, 2008: Multi-scale organization of convection in a global numerical simulation of the December 2006 MJO event using explicit moist processes. J. Meteor. Soc. Japan, in revision : multiscale Sato, T. et al. (submitted): diurnal cycle of precipitation Taniguchi et al (in preparation) : EOF analysis (vs. NCEP) Miura (submitted) : sensitivity experiments
7 Hovmöller diagrams: precipitation, temperature Precipitation (10S-5N) TRMM PR NICAM NC dx=7 km T (975 hpa) NCEP Eastward m/s km (1-2 day) NICAM dx=7 km Miura et al. 2007; An Madden-Julian Oscillation event simulated using a global cloud-resolving model. Science, 318, 1763(2007); doi: /science
8 Hovmöller diagrams: precipitation, zonal wind Precipitation (10S-5N) TRMM PR NICAM NC dx=7 km U (975 hpa) NCEP Eastward m/s km (1-2 day) NICAM dx=7 km Miura et al. 2007; An Madden-Julian Oscillation event simulated using a global cloud-resolving model. Science, 318, 1763(2007); doi: /science
9 Zonal wind (4-day running mean subtracted) NCEP NICAM NC dx=7 km 3N-3S 3S average Black lines: IR TBB Black lines: OLR, white: precipitation
10 Zonal velocity contour: temperature Vertical structure; composite along gust front 3N-3S 3S average (a) (b) Deviations i from time average Temperature contour: condensate Condensate contour: vertical velocity
11 symmetric Single 30-day series of Precipitation, cloud water + cloud ice zonal wavenumber-frequency spectra IGW (n=3) IGW (n=1) Kelvin 5 m/s MJO Divided by Background Spectra: anti-symmetric 40 (10) times 1-2-1filter IGW (n=2) MRG, EIGW(n=0) No tapering No tapering Not detrended
12 Zonal velocity contour: temperature Vertical structure; composite along gust front 3N-3S 3S average (a) (b) Deviations i from time average Temperature contour: condensate Meridional Velocity contour: zonal velocity
13 Zonal velocity contour: temperature Vertical structure; composite along gust front 3N-3S 3S average (a) (b) Deviations i from time average Temperature contour: condensate Meridional Velocity contour: zonal velocity
14 MISMO JAMSTEC
15 Precipitation (10S-5N) TRMM PR NICAM NC dx=7 km Column integrated cloud water 2Jan 2007 Eastward m/s km (1-2 day) 6 Jan 2007 Isobel rainband rainband Miura et al. 2007; An Madden-Julian Oscillation event simulated using a global cloud-resolving model. Science, 318, 1763(2007); doi: /science
16 NICAM (dx=7km) Similar feature in observations?? (Dr. H. Yamada) B A
17 NICAM (dx dx=7km) Similar feature in observations?? (Dr. H. Yamada) B A
18 NICAM (dx dx=7km) Similar feature in observations?? (Dr. H. Yamada) B A
19 NICAM (dx dx=7km) Similar feature in observations?? (Dr. H. Yamada) B A
20 NICAM (dx dx=7km) Similar feature in observations?? (Dr. H. Yamada) B A
21 Precipitation (10S-5N) TRMM PR NICAM NC dx=7 km Eastward m/s km (1-2 day) Miura et al. 2007; An Madden-Julian Oscillation event simulated using a global cloud-resolving model. Science, 318, 1763(2007); doi: /science
22 Vertical structure; composite along gust front area-average Rainband db 3N-3S 3S average NICAM (dx=7km) E front E background Zonal velocity contour: Vertical velocity E front E rear Temperature contour: Condensate Squall-type cluster
23 Summary Global cloud-reolving simulation of a boreal winter MJO event (December 2006-January 2007) eastward propagating convective signal m s -1, km scale, 2 day period (< superclusters), consisted of cloud clusters similar to those observed by Dunkerton and Crum (1995), Ichikawa and Yasunari (2007) exist regardless of the MJO. accompanied with squall-type clusters when the vertical easterly shear associated with the MJO was enhanced (major system?). at least two types of wave disturbances were relevant to the organization of the squall-type clusters 1. equatorially trapped gravity waves (10( m s - 1, km scale 2. modified mixed Rossby-gravity waves 2000 km scale Nonlinear interactions of wave disturbances & moist convection Upscale effects of convection on the MJO-scale dynamics
24 B A B A
25 meridional wind (4-day running mean subtracted) NCEP NICAM NC dx=7 km 3N-3S 3S average Black lines: IR TBB Black lines: OLR, white: precipitation
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