BOW-TIE — August and September 2024
Ship based measurement campaign on-board the German RV METEOR.

Cape Verde

10th of AugustBarbados
24th of September

BOW-TIE — August and September 2024
A rough estimate suggests
about 3 to 5 EarthCARE
overpasses.

BOW-TIE — August and September 2024
Focus is on the Atlantic intertropical convergence zone

Location of the ITCZ on the 15th of August 2001 as indicated by the column water vapour field (ERA5).

CWV / mmWhy the intertropical convergence zone?
• As the rising branch of the Hadleycirculation it structures the global
circulation system• ⅓ of the global precipitation falls
within the associated latitudinal band
• Associated with a longstanding bias inclimate models• Classic picture: A line of surface
convergence with clouds andprecipitation centered around it

Scientific motivation
BOW-TIE seeks to understand how air-mass properties and meso-scale processes, influence thestructure and dynamics of the inter-tropical convergence zone.

Snapshots from VIIRS (NOAA-20) from the 1st of July 2021 until the 15th of July 2021 in the East Atlantic (26°W to 20°W)

BOW-TIE instrumentation — Atmosphere
Atmospheric profiles of Humidity, Wind, Temperature, Clouds, and Aerosol(RAMAN LiDAR - 1064, 532, 355 nm, Radiosondes, Wind LiDAR, W-band cloud radar, Drones*)
3D Precipitation field (PICCOLO: CSU Sea-Pol C-band scanning Rain Radar*)Cloud base height, Cloud Water and Water Content(Ceilometer, Microwave radiometer, GPS Met.)
Precipitation, Surface Wind Speed and Direction, Sea-Surface Temperature, Surface fluxes, Aerosols(Disdrometer, Infrared Thermometer, Sea snakes, Onboard Weather Station, Ultra-Sonic
Anemometer/Thermometer, Open-path gas analyser, Aerosol Spectrometer)+ Upper ocean measurements*Funding decision still pending

BOW-TIE instrumentation — Atmosphere
Atmospheric profiles of Humidity, Wind, Temperature, Clouds, and Aerosol(RAMAN LiDAR - 1064, 532, 355 nm, Radiosondes, Wind LiDAR, W-band cloud radar, Drones*)
3D Precipitation field (PICCOLO: CSU Sea-Pol C-band scanning Rain Radar*)Cloud base height, Cloud Water and Water Content(Ceilometer, Microwave radiometer, GPS Met.)
Precipitation, Surface Wind Speed and Direction, Sea-Surface Temperature, Surface fluxes, Aerosols(Disdrometer, Infrared Thermometer, Sea snakes, Onboard Weather Station, Ultra-Sonic
Anemometer/Thermometer, Open-path gas analyser, Aerosol Spectrometer)+ Upper ocean measurements*Funding decision still pending

SHIP-STABILIZED 94 GHZ RADAR, MICROWAVE RADIOMETER
Set-up from EUREC4A also planned for BOW-TIE on the RV METEOR – Navigation Deck

LU stabilized
Cloud Radar

MPI-Met HHCeilometer

LU MWR

Sketch: RV Meteor Handbook

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Application of Cloudnet retrieval algorithms
LIMRAD94
stabilized cloudradar

Hydrometeor target classification

ship-motion corrected

LIMHAT-MWR

Illingworth et al., 2007
Tukkianen et al., 2020

MPI-HH
Ceilometer

Higher level Cloudnet products
Liquid water content (LWC)
Ice water content (IWC)
Droplet effective radius
Ice crystal effective radius
Droplet number concentration
https://cloudnet.fmi.fi

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

94 GHz FMCW Doppler cloud radar (RPG) in ship stabilization
platform-Passive stabilization mount
two axis cardanic mount: allows for freeswinging of radar
max. tilt angle of radar: +- 20 deg
150 kg stabilization weights
wind fence to limit wind drag on radar
motion sensors: radar in-built, Arduino,
RV Meteor Seapath in center of ship
First voyage: eurec4a

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

94 GHz FMCW Doppler cloud radar (RPG) in ship stabilization
platform-Passive stabilization mount
two axis cardanic mount: allows for freeswinging of radarmax. tilt angle of radar: +- 20 deg
150 kg stabilization weights
wind fence to limit wind drag on radar
motion sensors: radar in-built, Arduino,
RV Meteor Seapath in center of ship
First voyage: eurec4aFree-swing

Strap-down

à Conclusion: Stabilization platform performed satisfactory during eurec4aà Experienced roll+pitch angles generally < 0.4 +-0.31° (mean +- std dev)*
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

BOW-TIE is part of ORCESTRACWV / mm

HALO

ATR42 - SAFIRE

Barbados
CloudObservatory

RV METEORESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Conclusion• BOW-TIE is a ship based measurement
campaign in the tropical Atlantic in
August and September 2024
• The scientific focus is on the dynamic andthermodynamic structure of theIntertropical Convergence Zone
• About 3 to 5 EarthCARE overpasses are
expected• Different on-board atmosphericmeasurements may be useful for satellite
validation (e.g. radiosondes)• Core instrument for validation is the WBand Radar from the University of Leipzig(Heike Kalesse-Los )INSTRUMENT NAMEINSITUTCONTACT PERSON

Microwave radiometer (HATPRO)

Uni Leipzig

Heike Kalesse-Los (heike.kalesse@uni-leipzig.de)GPS met.

MPI-M

Pierre Bosser (pierre.bosser@ensta-bretagne.fr)

Disdrometer (x2)

MPI-M

Friedhelm Jansen (friedhelm.jansen@mpimet.mpg.de)

LIDAR

MPI-M

Ilya Serikov (ilya.serikov@mpimet.mpg.de)Ceilometer

MPI-M

Friedhelm Jansen (friedhelm.jansen@mpimet.mpg.de)Infrared Thermometer (skin temp.)

University of Southampton

Werenfried Wimmer (w.wimmer@soton.ac.uk)

Sea snakes (SST)NOAA

Elizabeth Thompson (elizabeth.thompson@noaa.gov)

Radiosondes

MPI-M

Björn Brügmann (bjoern.bruegmann@mpimet.mpg.de)

Flux measurements

Uni. Hamburg

Felix Ament (felix.ament@uni-hamburg.de)Aerosol measurements

TROPOS

Mira Pöhlker (mira.poehlker@tropos.de)

Sea-Pol

FSU

Allison Wing (awing@fsu.edu)

DronesIGF PAN

Dariusz Baranowski (d.baranowski@igf.edu.pl)

DronesTU Delft

Geet George (g.george@tudelft.nl)

SunphotometerNASA

Alexander Smirnov (alexander.smirnov-1@nasa.gov)

Wind LIDAR* (stabelized)

MPI-M

Ilya Serikov (ilya.serikov@mpimet.mpg.de)Wind LIDAR* (stabelized?)TU Delft

Louise Nuijens (Louise.Nuijens@tudelft.nl)

Wind LIDAR* (stabelized?)

U Leipzig

Matthias Tesche (matthias.tesche@uni-leipzig.de)

W-Band Radar (stabelized with cardanicmount)

U Leipzig

Heike Kalesse-Los (heike.kalesse@uni-leipzig.de)Micro Rain RadarU Leipzig

Heike Kalesse-Los (heike.kalesse@uni-leipzig.de)CPICS (on Rosette)

HEREON

Klas Möller (Klas.Moeller@hereon.de)

UVP-6 HF (on Rosette)

HEREON

Klas Möller

WireWalker (Drifting)

HEREON

Klas Möller

UVP-6 LP (on Glider)

HEREON

Klas MöllerVPR (towed Camera)

HEREON

Klas Möller

Plankton Net

HEREON

Klas Möller

FlowCam

HEREON

Klas Möller

Ocean Gliders

GEOMAR

Marcus Dengler (mdengler@geomar.de)

Microstructure system

GEOMAR

Marcus Dengler

Drifting buoy

GEOMAR

Marcus Dengler

CTD/Rosette system

GEOMAR

Marcus Dengler

underway CTD system

GEOMAR

Marcus Dengler

Mooring equipment

GEOMAR

Marcus Dengler

Biogeochemical analysis

MPI für Marine MikrobiologieWiebke Mohr (wmohr@mpi-bremen.de)94 GHZ FMCW DOPPLER CLOUD RADAR (RPG) IN SHIP
STABILIZATION PLATFORM@eurec4a:

New @BOWTIE:
Sensor combination

Initialize &compensate if
accelation > 1g

Attitude angle PDF

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy