a few specific questions in coastal meteorologyvocals coastal component workshop santiago, chile....
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![Page 1: A few specific questions in coastal meteorologyVOCALS Coastal Component Workshop Santiago, Chile. 3-4 April 2007 A few specific questions in coastal meteorology René Garreaud, José](https://reader035.vdocuments.mx/reader035/viewer/2022071407/60fe3c081f51af5db60f7300/html5/thumbnails/1.jpg)
VOCALS Coastal Component Workshop Santiago, Chile. 3-4 April 2007
A few specific questionsin coastal meteorology
René Garreaud, José Rutllant, Ricardo Muñoz,Jorge Carrasco, Mark Falvey, Laura Gallardo, Lionel Renault
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AQUA VIS Image50% Coastal Meteorology here
POCS (drifting from the coast?)Continental air pollution
Solid-broken SCu deck
Coastal diurnal clearing
Persistent cloudy regions
Synoptic-scale clearing
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Among several interesting features of the sfc. ws field, we focus on the coastal jet off central Chile and the low-speed area around 18°S. Also notice the wind maximum @ 15°S only present during JJA
...the remaining 50% of coastal meteorology
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V
U
θ
w
V
U
θ
w
Simulated (MM5) structure of the coastal jet
V > 18 m/sGarreaud and Muñoz 2005
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WHOI Stratus-2004 Cruise
WS>15 m/s
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vvHCfu
yp
yvv
xvu
tv d r−+
∂∂
−=∂∂
+∂∂
+∂∂
ρ1
Steady-state Dynamics
vuHdC
fvxp
yuv
xuu
tu r−+
∂∂
=∂∂
+∂∂
+∂∂
ρ1
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SQ1-Climatological near-coastal wind máxima around 30°S:
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Max UpwellingMin SST
ExpansionFan?
SQ1-Climatological near-coastal wind máxima around 30°S:
Structure? Wind-SST feedback or expansion fan Effect?
• Aircraft zonal coastal jet missions • Radiosonde from R/V• Modeling: control(?) + sens. runs J2J1
SSTFront
Coastal JetCore: v∼∂p/∂y
74°W
72°W
70°W
30°S
28°S
32°S
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Jet-structure in mean field producedby frequent (weekly) jet events
σ
63% of days 37% of days
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SQ3. Coastal Jet under Clear Skies…Why?(+300 W/m2 reaching the surface)
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Coastal clearing could be produced by offshore advection of dry air and/or enhanced subsidence…what are the relative roles?
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Renault et al. 2006
SQ4. Impacts of Jet Events on SST
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Renault et al. 2006
Impacts of Jet Events on SST
Wind, SST and SST anomalies
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To understand/quantify the response of the surface ocean to coastal jet events we propose ship-borne observations, aircraft observations (at onset, height and demise of the event), as wellas modeling experiments (in progress, WRF+ROMS)
Renault/Falvey
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Rob Wood, 2006
Near-stagnation zone at 18°SCollocated with maximum en CDC
Topographically induced? How deep?Sometime flush?
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MM5 simulation, Sep-Oct 2003, single domain, 30 km hor. res. (blue dots)
120-hr backward and forward 3-D trajectories were calculated for 920 selected points (red dots), every 6 hr at 6 vertical levels (990, 950, 900,
860, 830, 800 hPa aprox.)
Garreaud, Falvey, Muñoz
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910
820
710620
Trajectory information (lat,lon,pres,temp,rh) was saved every 3 hours.Quite a bit of data: 6 × 920 ×(24/6) ×50 ×(120/3) ×5 = 220 Mill !!
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P0=995 hPa(near surface)
P0=950 hPaMBL
P0=850 hPaInversion
-36 hr
+36 hr
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Show for each starting point (p0=900 hPa), the proportion of trajectories that have passed over continental topography at above surface altitudes of less than 2000 m
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Key features of diurnal cycleMax. amplitude of V-wind off northern ChileNocturnal decoupling of wind on coastal stripCoastal clearing
0 2 4 6 8 10 12 14 16 18 200
2
4
6
8
10
12
14
16
18
20Velocidad LDV versus Quikscat
Vel Quikscat (m/s)
Vel
LD
V (
m/s
)
PMAM
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MM5 Model Results for Sep-Oct 2003 (Muñoz 2007)
Coastal gradient of pressure exhibits a large diurnal cycle off N. ChileAfternoon decrease in sfc. pressure associated with subsidence diurnal cycleHow the AMBL reacts to the diurnal cyle of W?