EPIC 2001 SE Pacific Stratocumulus Cruise 9-24 October 2001 Chris Bretherton and Sandra Yuter (U. Wash.) Chris Fairall, Taneil Uttal (NOAA/ETL) Bob Weller.

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Presentation transcript:

EPIC 2001 SE Pacific Stratocumulus Cruise 9-24 October 2001 Chris Bretherton and Sandra Yuter (U. Wash.) Chris Fairall, Taneil Uttal (NOAA/ETL) Bob Weller (WHOI)

Goals Document cloud and boundary layer structure in the SE Pacific Assess the importance of drizzle processes to cloud thickness and extent Compare results with other Sc regimes and with large-scale models Maintain WHOI IMET buoy at 20S 85W

NOAA/ETL (surface met., fluxes, mm radar, lidar) Participants

UNAM (aerosol concentration and characterization)

Participants WHOI (CTDs, IMET buoy)

Participants University of Washington (sondes, 5 cm scanning radar, meth blue, cloud photos)

EPIC Sc cruise 9-24 Oct. 2001

3 hr rawinsonde launches (Kim Comstock, UW)

cld top cld base LCL Cloud top and dBZ (MMCR), base (ceilometer), LCL (surf. met.)

[m s -1 ] ECMWF VERTICAL VELOCITY [dBZ] Diurnal Cycle

Sample of C-band scanning radar and coincident MMCR dBZ

Meth Blue Rain Rate Number/second Z=58R 1.1

Remotely-sensed cloud microphysics (Rob Wood, UW) …UNAM also found a strong diurnal signal in submicron aerosol conc.

MODIS 10/16/2001; 10:00 Local (16:00 UTC) cm g m mm Liquid water pathDroplet concentrationEffective radius SHIP 250 km

Comparison of 6-day mean 20S 85W profiles with models All models (esp CAM) have too shallow a PBL. CAM2 LWC all in lowest 3 levels ( m). Observed LWC mainly at m. (Peter Caldwell, UW)

Conclusions A remarkable dataset was gathered documenting both spatial and diurnal variability of the SE Pacific Sc regime Pronounced diurnal cycle, amplified by subsidence wave from S America. Mesoscale drizzle cells ubiquitous, especially at night; rain mostly evaporates above surface, sensitive to cld drop conc. Boundary layer deeper than current global models; well-mixed in early evening.