Download - The (dynamically-driven) diurnal cycle in the SEP * Does it exist? * Does it impact clouds?
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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 GeophysicsUniversidad de Chile
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SubtropicalHigh
CoastaljetSCu deck
SAM
ITCZAndes M
ts.Storm Track
L
H
VAMOS: Dynamical link between South American Monsoonand SEP, first suggested by Gandau and Silva-Dias (1998)
Key atmospheric features over the SEP
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◄ Mean diurnal cycle of vertical velocity at 800 hPa
MM5 resultsSON simulation
Garreaud and Muñoz 2004
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wIsosurface w < -0.1 mm/sOct-Nov 2008 mean
WRF Simulation 21 UTC 18 LT24z
03z
Cup 30 m/s 100 km/h
Csun 15º/h 1500 km/h W C
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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
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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).
MM5-1D Experiments (no advection)21ºS, 76ºW, 17 Nov 2001
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BAMS 2004
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QJRMS 2009
ECMWF
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20ºS 85ºW 20ºS 75ºW
ACP 2010
’ hourly departure from 3-day mean
at 2.5 km
R/B Soundings during VOCALS-REx (add all Stratus Cruises!!!)
30 m/s
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Zonal Wind (U) Meridional Wind (V) Temperature (T)Iq
uiqu
e (2
1°S
)M
ichi
lla (
22.5
°S)
Pap
oso
(25°
S)
N
N
S
S
WE
Coastal range
Andes Mnt
Coastal range
Andes Mnt
Coastal range
Andes Mnt
Observed coastal diurnal cyclesPaposo & Iquique: VOCAL-REx (Oct-Nov 2008)
Michilla: DICLIMA (January 1998)
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JClim 2009
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Observations of the Diurnal Cycle of Marine Stratocumulus Clouds and Precipitation
Casey Burleyson1, Sandra Yuter1, and Simon de Szoeke2
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JCim 2008
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JCim 2008
At this point, dominance of 12-h harmonic due to superposition of 24-h solar cycle and 24-h upsidence wave
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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 v Yes* Surface divergence Yes* Cloud top height Could be* Cloud fraction Could
be* Cloud LWP ???
Still pending origin of UpW….
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ACP 2010
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JAS 2005
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QJRMS 2009
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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
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• Significant diurnal cycle in up to 5 km ASL• Subsidence interrupted by period of upward motion• Cooling largely produced by vertical advection
W C W C W C
MM5 results. SON simulation.
Garreaud and Muñoz 2004
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QJRMS 2009
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QJRMS 2009