AVHRR warm‐season cloud climatologies under various synoptic regimes across the Iberian Peninsula and the Balearic Islands

ABSTRACT In this study we retrieved the spatial distribution of mid‐afternoon clouds under various synoptic regimes across the Iberian Peninsula and the Balearic Islands for the warm/convective‐season, from May to October. Accurate daily cloud masks were derived by applying a daytime over land multi...

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Bibliographic Details
Published in:International journal of climatology 2015-06, Vol.35 (8), p.1984-2002
Main Authors: Azorin‐Molina, Cesar, Vicente‐Serrano, Sergio‐M., Chen, Deliang, Connell, Bernadette H., Domínguez‐Durán, María‐Ángeles, Revuelto, Jesus, López‐Moreno, Juan‐Ignacio
Format: Article
Language:English
Subjects:
Climate
Clouds
Earth and Related Environmental Sciences
Geovetenskap och miljövetenskap
Iberian Peninsula and Balearic Islands
Meteorology
NOAA AVHRR
synoptic regimes
warm‐season cloud climatologies
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Summary:ABSTRACT In this study we retrieved the spatial distribution of mid‐afternoon clouds under various synoptic regimes across the Iberian Peninsula and the Balearic Islands for the warm/convective‐season, from May to October. Accurate daily cloud masks were derived by applying a daytime over land multispectral convective cloud detection algorithm spanning 15 years (1997–2011) of Advanced Very High Resolution Radiometer (AVHRR) HRPT data. We processed a total of 2094 afternoon overpasses (between 1230 and 1720 UTC) corresponding to the NOAA‐14, NOAA‐16 and NOAA‐18 spacecrafts, and stratified daily cloud masks as a function of: (1) the automated circulation‐typing scheme of Jenkinson and Collinson and (2) the prevailing wind field at 850 hPa. The AVHRR warm‐season cloud climatology with high spatial resolution (1.1‐km) identified six representative areas (regions of interest; ROIs) with intensified cloud activity (hot spots). The results also revealed the typical spatial distribution of clouds for each synoptic regime across the whole region, identified the synoptic patterns and wind regimes under which high amounts of clouds occur for each ROIs, and showed that strong boundary layer winds in general increase the frequency of clouds. The regional cloud climatology presented here could be useful, e.g. to improve convective short‐term forecasting by identifying active cloud areas for each atmospheric type.
ISSN:0899-8418
1097-0088
1097-0088
DOI:10.1002/joc.4102