post ( physics of stratocumulus top) hermann gerber, p.i. gcss/cfmip meeting, 7-12 june, 2009 ubc,...

POSTPOST ( (Physics of Stratocumulus Top)Physics of Stratocumulus Top)

Hermann Gerber, P.I.GCSS/CFMIP Meeting, 7-12 June, 2009UBC, Vancouver, Canada

IntroductionIntroduction

University of Warsaw Szymon Malinowski, Wojciech Kumula, Krysztof Haman Gerber Scientific Hermann GerberUniversity of Utah Steven Krueger, Samantha HillUniversity of Washington Rob WoodColorado State University Takanobu YamaguchiUniversity of California, UCSC Patrick Chuang, Dione Lee RossiterUniversity of California, UCI Djamal Kheli, Carl FrieheDesert Research Institute Jim Hudson NPGS Qing WangNCAR Stuart Beaton, Wojciech GrabowskiCIRPAS Haflidi Jonsson, Roy Woods, Jesus GalvanNRL Arunas Kuciauskas, Shouping Wang, Anthony Bucholtz

PARTICIPANTS

SPONSORS

National Science FoundationOffice of Naval Research

(Stevens et al., B.A.M.S., 2003, 38)

MontereyPOST

DYCOMS II

ENTRAINMENT VELOCITY vs BUOYANCY JUMP

POST

DYCOMS II

1000-hz PVM and UFT Data

Issues

Approach

High-resolution Lagrangian aircraft measurements in unbroken Sc

What are the properties and role of the EIL (Entrainment Interface Layer)?

Is isothermal entrainment of conditioned EIL air the rule?

Are details of processes at Sc top necessary for accurate we estimates,or do knowledge of surface fluxes, interface jumps, and radiation suffice?

How important is CTEI?

Does Sc modeling from microphysical- to meso-scales compare favorably with POST observations?

Can existing parameterizations of we be improved?

CIRPAS TWIN OTTER

45.7 cm

55.9 cm

~60 cm

14 cm

38.1 cm 8.9 cm

21.6 cm

PVM

UFT

L-alphaUCI

L-alphaNCAR

L-alphaLycor, UCI

INSTRUMENTATION on T.O. NOSE

GustProbe (40 hz)

(40 hz)

(40 hz)

(1000 hz)

(1000 hz)

(100 hz)

http://www.eol.ucar.edu/projects/post/http://www.eol.ucar.edu/projects/post/

POST FLIGHTS:

July 16 – Aug. 15, 2008 17 flights (~5 hr. each)8 night-time flights9 day-time flights15 Lagrangian flights

20 km

Twin Otter Vertical Flight Track

Sc Top

Sc base

FLIGHT TO10

POST Web Page:POST Web Page:

http://www.eol.ucar.edu/projects/posthttp://www.eol.ucar.edu/projects/post

Suggested POST Web Page Browsing: POST Field Catalog,Suggested POST Web Page Browsing: POST Field Catalog,Science Team Meeting (5-6 Feb, 2009), Initial Analysis by Qing Science Team Meeting (5-6 Feb, 2009), Initial Analysis by Qing Wang at MeetingWang at Meeting