HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Spatial and seasonal variability of clouds over the southwest Indian Ocean based on the DARDAR mask product

Hélène Vérèmes 1 Constantino Listowski 2 Julien Delanoë 2 Christelle Barthe 1 Pierre Tulet 1 François Bonnardot 3 Denis Roy 3
1 LACy - Laboratoire de l'Atmosphère et des Cyclones
2 SPACE - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 DIROI - Direction Interrégionale de Météo-France pour l'océan Indien
Abstract : We present a characterization of the variability of clouds over the South‐West Indian Ocean between 2007 and 2010. Cloud occurrence is derived from the DARDAR (raDAR/liDAR) mask, a synergistic product based on CALIPSO (Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation) and CloudSat measurements. It provides a target classification for hydrometeors. We demonstrate that this product is suitable for studying the vertical, spatial and seasonal cloud distribution in the South‐West Indian Ocean. The variability of cloud occurrence increases approaching the tropics: the average maximum amplitude of monthly occurrence is ∼7% between 30°S and 60°S and ∼14% between 10°S and 30°S. The 10‐30°S latitudinal band exhibits the largest contrasts: summer (winter) total cloud occurrence is mainly driven by high‐ (low‐) level clouds. The vertical distribution of clouds differs on either side of 55°E and this is related to a land‐ocean contrast and to large‐scale influence. In winter, east of 55°E, the maximum of cloud occurrence corresponds to warm and mixed‐phased precipitating clouds associated with the Mascarene High. In summer, west of 55°E, the vertical distribution of cloud occurrence is driven by deep convection associated with the Inter Tropical Convergence Zone and the Near Equatorial Trough. The vertical distribution of cloud occurrence shows an interannual variability that is related to El Niño events. The influence of other oscillation modes should be further investigated.
Document type :
Journal articles
Complete list of metadata
https://hal-insu.archives-ouvertes.fr/insu-02285578
Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Thursday, September 12, 2019 - 7:05:22 PM
Last modification on : Monday, April 11, 2022 - 3:56:33 PM

Identifiers

Collections

INSU | METEO | LATMOS | UVSQ | CNRS | LACY | SORBONNE-UNIVERSITE | SU-SCIENCES | UNIV-REUNION | FST-REUNION | UNIV-PARIS-SACLAY | AFRIQ | GS-ENGINEERING | GS-GEOSCIENCES | INSTITUT-SCIENCES-LUMIERE

Citation

Hélène Vérèmes, Constantino Listowski, Julien Delanoë, Christelle Barthe, Pierre Tulet, et al.. Spatial and seasonal variability of clouds over the southwest Indian Ocean based on the DARDAR mask product. Quarterly Journal of the Royal Meteorological Society, Wiley, 2019, 145 (725), pp.3561-3576. ⟨10.1002/qj.3640⟩. ⟨insu-02285578⟩

Export

BibTeX TEI DC DCterms EndNote Datacite

Share

Metrics

Record views

114