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The (dynamically-driven) diurnal cycle in the SEP * Does it exist? * Does it impact clouds?

The (dynamically-driven) diurnal cycle in the SEP * Does it exist? * Does it impact clouds?. René D. Garreaud , Ricardo Muñoz , Dave Rahn and José Rutllant Department of Geophysics Universidad de Chile. Key atmospheric features over the SEP.

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The (dynamically-driven) diurnal cycle in the SEP * Does it exist? * Does it impact clouds?

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  1. The (dynamically-driven) diurnal cycle in the SEP* Does it exist?* Does it impact clouds? René D. Garreaud, Ricardo Muñoz, Dave Rahn and José Rutllant Department of Geophysics Universidad de Chile

  2. Key atmospheric features over the SEP VAMOS: Dynamical link between South American Monsoon and SEP, first suggested by Gandau and Silva-Dias (1998) SAM Storm Track Coastal jet Andes Mts. SCu deck L ITCZ Subtropical High H

  3. MM5 results SON simulation ◄Mean diurnal cycle of vertical velocity at 800 hPa Garreaud and Muñoz 2004

  4. Isosurface w < -0.1 mm/s Oct-Nov 2008 mean WRF Simulation w 03z 24z 21 UTC  18 LT Cup 30 m/s  100 km/h Csun 15º/h  1500 km/h WC

  5. MM5-1D Experiments (no advection) Impact dependent on location / interference with solar cycle 21ºS, 76ºW, 17 Nov 2001 Diurnal cycle in w and solar radiation Diurnal cycle in solar radiation only

  6. MM5-1D Experiments (no advection) 21ºS, 76ºW, 17 Nov 2001 WMEAN WVAR Significant drying (and little cooling) during nighttime hours when upsidence prevails. Larger entrainment at the top of a deeper MBL. (WLS influence the size of the eddied).

  7. BAMS 2004

  8. QJRMS 2009 ECMWF

  9. ACP 2010 R/B Soundings during VOCALS-REx (add all Stratus Cruises!!!) ’ hourly departure from 3-day mean  at 2.5 km 20ºS 85ºW 20ºS 75ºW 30 m/s

  10. Meridional Wind (V) Temperature (T) Zonal Wind (U) Iquique (21°S) Michilla (22.5°S) Paposo (25°S) Observed coastal diurnal cycles Paposo & Iquique: VOCAL-REx (Oct-Nov 2008) Michilla: DICLIMA (January 1998) Andes Mnt N Coastal range S Andes Mnt Coastal range Andes Mnt E N Coastal range W S

  11. JClim 2009

  12. Observations of the Diurnal Cycle of Marine Stratocumulus Clouds and Precipitation Casey Burleyson1, Sandra Yuter1, and Simon de Szoeke2

  13. JCim 2008

  14. JCim 2008 At this point, dominance of 12-h harmonic due to superposition of 24-h solar cycle and 24-h upsidence wave

  15. From pre-VOCALS and VOCALS-REx data, the upsidence wave (propagating offshore from the Southern Peruvian / Northern Chile coast) has an impact in the diurnal cycle of: * Mid-troposheric  and vYes * Surface divergence Yes * Cloud top height Could be * Cloud fraction Could be * Cloud LWP ???Still pending origin of UpW….

  16. ACP 2010

  17. JAS 2005

  18. QJRMS 2009

  19. A distinctive feature of this Sc deck is its particularly pronounced diurnal cycle in cloud amount (Minnis and Harrison 1984; Rozendaal et al. 1995) and LWP (Bretherton et al. 2003; Wood et al. 2002), that is highly relevant to the quantification of the true impact of Sc on climate (Bergman and Salby 1997). Bretherton et al. 1999

  20. MM5 results. SON simulation. WCWCWC • Significant diurnal cycle in  up to 5 km ASL • Subsidence interrupted by period of upward motion • Cooling largely produced by vertical advection Garreaud and Muñoz 2004

  21. QJRMS 2009

  22. QJRMS 2009

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