Topic 7: remote sensing of cloud particles and properties;

validation etc.

CALIPSO horizontally-oriented ice crystals in cirrus Noel &

Chepfer, JGR, 2010

“Oriented crystals are conspicuouslyabsent in warm ice clouds directly above Antarctica”

“Oriented crystal appear rarely in the CALIOP data set: 6% of optically thin ice cloud layers contain∼oriented crystals; within those layers less than 10% of crystals are oriented (generally 1–5%)”

CALIPSO / CloudSat validation in the Arctic with RALI aircraft, Delanoe et al.,

JAMC, 2013Combined radar-lidar gives closer IWC content to in-situ measurements (relative to cloud particle imager)

DARDAR (combined satellite) & RALI retrievals generally similar

CALIPSO validation in mid-latitude clouds using

in-situ (LNG) lidar – Mioche et al., JGR, 2010

CIRRUSCIRRUS

In-situ obs.

CALIPSO optical properties: validation in the tropics with airborne lidar – Hvlaka et al.,

JGR, 2012

coincident ice cloud measurements of lidar ratio, extinction coefficient, and optical depth

CALIPSO

Airborne lidar

“The [CALIPSO] horizontally-oriented ice distribution results in more frequent high [extinction] values compared to randomly-oriented ice conditions.”

Cirrus fall velocity estimates using ‘Match’ method with

ground-base lidar, Dionisi et al., AMT, 2013

Case study of a trajectory overpassing Haute Provence & Rome lidars. Fall speed of SVC 1.4 – 1.9 cm/s

Haute-Provence Rome