PARSAX An Informal Look at Radar Technology and Applications within TU Delft

4Sep/100

The impact of drizzle on cloud lifetime

Recently it became known that researchers from Atmospheric Remote Sensing group in TU Delft (prof. dr. ir. H. Russchenberg) received the financial support for their project proposal from the Netherlands Space Office (NSO).They are going to combine ground-based and space-borne observations to look into the formation of drizzling clouds under different weather conditions. The project results will enable a better description of the impact of drizzle formation on cloud lifetime, such that it can help to better understand the role of clouds in the Earth's climate.

GO-AO/24: The impact of drizzle on cloud lifetime: an observation strategy using joint ground and satellite remote sensing

Low-level liquid water clouds highly influence the Earth's climate due to their shortwave radiative forcing, but the extent to which they relate to global warming is still under debate. Key here is a proper description of the cloud microphysical structure, lifetime and the meteorological regime. Drizzle formation is often regarded as a major factor effecting the cloud lifetime. This effect has been shown to occur under specific circumstances, e.g. maritime stratocumulus, but unambiguous evidence on a global scale has not been delivered yet. Its quantitative impact on climate change is still uncertain. 

In many satellite techniques the often occurring drizzle formation is neglected. These techniques assume that clouds are adiabatic in which droplets grow while they ascend. In drizzling clouds the droplets grow while they descend. This limits the applicability of space-based retrievals of the cloud microphysical structure. 

Drizzling clouds

Drizzling clouds

Detailed studies of the height-time structure of drizzling clouds can be performed from the ground, using remote sensing tools at so-called anchor stations. These stations are, however, not well-suited for studies of the horizontal structures. Combination with satellites is a prerequisite for obtaining a large scale overview.

In this project we will combine ground-based and space-borne observations to measure the evolution of the temporal-spatial structure of drizzling clouds under different meteorological conditions. The project results will enable a better description of the impact of drizzle formation on cloud lifetime, such that it can help to better understand the role of clouds in the Earth's climate.

NSO Office page

Filed under: Events, Funding No Comments
3Sep/100

Radars in AMS Journals: August 2010

 Journal of Applied Meteorology and ClimatologyJournal of Applied Meteorology and Climatology, Volume 49, Issue 8 (August 2010)

  • Boodoo, S., D. Hudak, N. Donaldson, M. Leduc, 2010: Application of Dual-Polarization Radar Melting-Layer Detection Algorithm. J. Appl. Meteor. Climatol., 49, 1779–1793. - link
  • Jameson, A. R., A. B. Kostinski, 2010: On the Enhanced Temporal Coherency of Radar Observations in Precipitation. J. Appl. Meteor. Climatol., 49, 1794–1804. - link

Journal of Atmospheric and Oceanic Technology, Volume 27, Issue 8 (August 2010)

  • Kim, D-S., M. Maki, D-I. Lee, 2010: Retrieval of Three-Dimensional Raindrop Size Distribution Using X-Band Polarimetric Radar Data. J. Atmos. Oceanic Technol., 27, 1265–1285. - link
  • Park, Shinju, Frédéric Fabry, 2010: Simulation and Interpretation of the Phase Data Used by the Radar Refractivity Retrieval Algorithm. J. Atmos. Oceanic Technol., 27, 1286–1301. - link 

Bulletin of the American Meteorological Society, Volume 91, Issue 8 (August 2010)

  • Bartello, P., B. J. Devenish, J. D. Haigh, J. C. Vassilicos, 2010: Clouds and Turbulence. Bull. Amer. Meteor. Soc., 91, 1087–1089. - link
    The Turbulence Workshop Summary
2Sep/100

Workshop “Waveform-Agile Radar: Signals, Algorithms, and Systems”

The European Microwave Week 2010, Paris, France

During the European Microwave Week 2010 at the end of September, the 7th European Radar Conference (EuRAD 2010), the major European forum to discuss the present status and the future trends in the field of radar technology and subsystems, radar system design and evaluation, and pertaining applications, will be held. This year this annual meeting will take place from 30 September to 1 October 2010 in Paris, France.

he 7th European Radar Conference (EuRAD) 2010In the frame of this conference we organize a workshop WHF01 "Waveform-Agile Radar: Signals, Algorithms, and Systems". At this workshop, top researchers-lecturers in the field of waveform agility will review the state of the art in the field of waveform diversity theory, radar waveforms' design, processing algorithms, and their implementation in modern radar systems, and discuss current and future applications of waveform diversity for radar. PARSAX radar system will be presented as an example of the flexible radar platform in which many aspects of waveform agility can be easily implemented.

The workshop will start October 1 at 13:40 in the Dupin 1 Room of the CNIT La Défense, Paris, France and includes three lectures:

  • Waveform Diversity: Past, Present, and Future
    by dr. Alfonso Farina, Selex, Italy
  • Space-Time Diversity and Coding for Active Antenna Arrays
    by Prof. dr. François Le Chevalier, Thales, France
  • PARSAX: Waveform-Agile Polarimetric Radar
    by dr. Oleg Krasnov, T.U Delft

There are still four weeks until this event ant the registration is still open. Welcome!