The southerly jet along the Chilean coast and its

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Presentation transcript:

The southerly jet along the Chilean coast and its relationship with the SCu cloud deck Ricardo Muñoz and René Garreaud (rgarreau@dgf.uchile.cl) Department of Geophysics Universidad de Chile

Surface wind maximum (jet) off Central Chile coast QuikScat data, 1997-2003, 0.25º

...Jet is largely due to the strong southerly wind along the coast... ...little diurnal variations in zonal wind, somewhat stronger variations in meridional wind at lower latitudes...

Seasonal variation of Vmax J J J J

Seasonal variation of PM-AM diff. in V J J

Seasonal variation of PM-AM diff. in U

MM5 simulation - October 2000 CIMAR-6 Vertical grid spacing: 25 m Horizontal grid spacing: 45 km MBL param.: Gayno-Seaman

U Easterly J V J W T J Height-latitude cross section at 73.5W 1500 m 1000 500 V J W T J 35S 30S 25S

U Easterly J V J W T J Height-longitude cross section at 29S 1500 m 1000 500 V J W T J 78W 75W 72W

Jet dynamics

Force balance at 312 m ASL

Synoptic variability (daily std): North-south displacement of the Jet along the chilean coast (25-40S)

V controlled by dp/dy also seems to hold for synoptic-scale variability

Synoptic-scale variations in the southerly Jet associated with changes in the Sc deck ...Jet under clear skies...

Results from CIMAR-6 Modeling effort: Two contrasting periods... ...Jet under clear skies...

However clear skies are due to Offshore-flow and subsidence

...and cloudy skies due to onshore-flow