Title: Preliminary Results from Stratus 03 Cruise on RV Revelle Fairall, Zuidema, Hare, Kollias, Tomlinson
1Preliminary Results from Stratus 03 Cruise on R/V
RevelleFairall, Zuidema, Hare, Kollias,
TomlinsonWCRP/CLIVAR/VAMOS Panel Meeting
7Guayaquil, EcuadorMarch 2004
2PACS STRATUS 2003
- left Manta Ecuador, went to 85W line, traveled
south to 20S - stayed at WHOI buoy from Nov. 15 21 (12 UTC)
- traveled east along 20S to Arica Chile
- data taken Nov. 13 Nov. 24
Aerosol measurements taken (new) but no C-band
radar
- Differences from the (October) EPIC 2001 cruise
- fewer thinner clouds less drizzle,
- particularly at the buoy (now at stratus deck
edge) - diurnal cycle in large-scale subsidence in
- inversion/cloud-top height weaker?
- SSTs 1K warmer cloudbase higher
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5Observation Systems
Cloud Radar and Microwave Radiometer
Climate Reference Buoy
6Above-BL moisture appears to subside into the BL,
separated by 4 days, coinciding with a rising
cloud top and drizzle at surface (JD 324).
Pink indicates radar-derived cloud top
7BL winds from SE, above-BL-winds more variable
(synoptics?)
Both virtual potential temperature and LCL show
influence of drizzle
885W, 20S Inversion less developed in Nov. 2003
than Oct. 2001 Boundary layer warmer 1.5K,
higher moisture content, less RH
RH
T
T
q
q
q
v
e
PACS03
q
EPIC01
9Clouds at buoy thin compared to the rest of the
cruise (and to EPIC 2001)
10Chris Fairalls simple aerosol counter compares
well to Don Collins aerosol measurements (rgt0.1
micron)
11Aerosol indirect effectWithin well-mixed
non-precipitating clouds, expect -dlnr/dlnN 0.3
sometimes its there,
sometimes not
12What is the relationship between drizzle,
aerosol, and liquid water path ?
13As well as surface fluxes.
14Comparison of Cloud Diurnal CycleEpic2001 vs
Stratus2003
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