BBC2 Overview

• Scientific aims

• Atmospheric conditions

• Events

Scientific aims

• Measured three dimensional LWC fields for radiative transfer calculations– Victor Venema (Uni Bonn), Clemens Simmer (Uni. Bonn), Markus

Quante (GKSS)

• Getting infrared images of cloud top and base with ground and aircraft based infrared imager – Jean-François Millot (CELAR)

• Error quantification of in-situ validation measurements for cloud retrievals with ground based remote sensing – Victor Venema (Uni Bonn), Clemens Simmer (Uni. Bonn), Markus

Quante (GKSS)

•  Scattering of radar waves by small scale cloud structures– Victor Venema (Uni Bon)

•  

• Microphysical cloud properties for correction algorithms of remote sensing data– Dagmar Nagel,(GKSS)

• Combining balloon-borne drop microphysical with aircraft and ground-based radiation measurements– Manfred Wendisch(Uni. Leipzi)

• Aircraft observations of solar radiation, turbulence and chemistry in shallow cumulus clouds– Han van Dop (IMAU), Keith M. Wilson (IMAU)

• Balloon-borne Lagrangian Study of the Indirect Aerosol Effect upon Cloud Microphysical Properties– Michael H Smith(Uni. Leeds)

• Validation of cloud parameter retrievals from MSG and AVHRR – Arnout Feijt (KNMI, Rob Roebeling (KNMI)

• Clear-sky shortwave radiation closure– Wouter Knap (KNMI), Piet Stammes (KNM)

• Turbulent structure of the convective boundary layer including the entrainment zone– Fred Bosveld (KNMI), Henk Klein Baltink (KNMI), Cindy Werner G&NS),

Jordi Vila WUR), Eddy Moors (WUR), Alex Vermeulen (ECN)

• Quality of Water Vapour Profiles and Boundary layer height observations – Iwan Holleman (KNMI), Sylvia Balag (KNMI)

• Validation of combined lidar and radar derived Ice Cloud radiative and micophysical properties.– Dave Donovan (KNMI) 

• Occurance of oriented ice crystals.– Dave Donovan (KNMI), S. Crewell (Uni. Bonn)

• Rain– Remco Uijlenhoet (WUR) 

• Cloud microphysics and radiation– Frederique Parol (Uni Lille)

•  

• Validation of cloud and aerosol data products from SCIAMACHY

– Piet Stammes (KNMI), Juan Acarreta (KNMI) • Entrainment in cumulus clouds

– A. Pier Siebesma (KNMI), Stephan de Roode (IMAU)

• Evaluating Statistical Cloud Schemes

– A. Pier Siebesma (KNMI)

• Trigger Function of Cumulus Convection– A. Pier Siebesma (KNMI)

• Top-Entrainment of the (Clear and) Scu topped boundary Layer– A. Pier Siebesma (KNMI)

• Measurements of aerosol particle size distributions and lidar profiles during BBC2– Gerrit de Leeuw (TNO-FEL)

Scientific aims

• Cloud measuring techniques (ground based and satellite)

• Cloud-radiation interactions

• Cloud free radiative transfer

• Cloud process studies (atmospheric modeling, precipitation)

Scientific aims

• Focus aircraft flights

– Water clouds with no cirrus on top

• stratified

• cumuli > 5 octa’s

– Cloud free conditions

Overview Atmospheric Conditions BBC2

Front

2km = 0oC

Front

Front

Cirrus shield

Front

Cloud free

Cirrus shield

Clear

Trailingcirrus

Cu

Cu 5+

Subsidence inversion

name: Erik van Meijgaarddate: 2003-05-08 06:24 UTC

Situation and Forecast for Thursday May 8th A rather inactive cold front is approaching from Britain and is expected to cross the Netherlands the coming night. High clouds associated with the front are currently over the North Sea touching North Holland but have a tendency to move NE. A warm front regenerated from an earlier frontal zone over Central Europe is moving NNE across France. Scattered thin cirrus associated with this front is already over the south east of the Netherlands.

Front

Cu 5+ Cu 5+ Cu 5+

Front

Subsidence inversion

Unstable air showers

Unstable air

BBCUnstable air

Front Unstable airFront

Unstable airStCuClear

Cu Old StCu

Cu

Unstable air

Cu in unstable air Unstable

air

Front Front Front

Front Front

StCuStCu

StCu

M

2km = 0oC

Cloud free

Clear Cu

Cu 5+

Subsidence inversion

M: test D: test

D M P: 8-9:30 9 May event

Communicating with the press

Communicating with high level in the ministry

Have a social event for Rotterdam/Cabauw/De Bilt

9 May Event at Cabauw

9 May event

Cu 5+ Cu 5+ Cu 5+

Unstable air Unstable air

Unstable air

Unstable airStCuClear

Cu Old StCu

Cu

D M P

D P: 10-12P

D M PD M P

D M P D M P

M: NS-CabauwScience Meeting De Bilt

Cu in

unstable air

Cu StCu

StCu

StCu

M P: NS-Cabauw

M M

Science Meeting Cabauw

BBC2 - BBQ

BBC2 - BBQ

Summary

• We were very lucky with the weather (good choice …)

• We had magnificant support from outside– Meteorologist (FP, De Bilt, Rotterdam)– Air trafic control (Schiphol and the Army)– Army for radiosonde launches, security, radiocar

• We have a great set of measurements comparible to the ARM-site data sets that should be brought into an easily accessible data base

Summary

• To make the efforts worthwhile– We should do the research we planned ++– The actual research has only started

• Outlook– We are bound to meet again in the next few years