The Spatio-Temporal Cloud Frequency Distribution in the Galapagos Archipelago as Seen from MODIS Cloud Mask Data

dc.contributor.authorZander, Samira
dc.contributor.authorTurini, Nazli
dc.contributor.authorBallari, Daniela
dc.contributor.authorBayas López, Steve Darwin
dc.contributor.authorCelleri, Rolando
dc.contributor.authorDelgado Maldonado, Byron
dc.contributor.authorOrellana-Alvear, Johanna
dc.contributor.authorSchmidt, Benjamin
dc.contributor.authorScherer, Dieter
dc.contributor.authorBendix, Jörg
dc.date.accessioned2023-08-14T08:54:29Z
dc.date.available2023-08-14T08:54:29Z
dc.date.issued2023-07-29
dc.date.updated2023-08-09T12:24:33Z
dc.description.abstractClouds play an important role in the climate system; nonetheless, the relationship between climate change in general and regional cloud occurrence is not yet well understood. This particularly holds for remote areas such as the iconic Galapagos archipelago in Ecuador. As a first step towards a better understanding, we analyzed the spatio-temporal patterns of cloud cover over Galapagos. We found that cloud frequency and distribution exhibit large inter- and intra-annual variability due to the changing influence of climatic drivers (trade winds, sea surface temperature, El Niño/La Niña events) and spatial variations due to terrain characteristics and location within the archipelago. The highest cloud frequencies occur in mid-elevations on the slopes exposed to the southerly trade winds (south-east slopes). Towards the highlands ( >900 m a.s.l), cloud frequency decreases, with a sharp leap towards high-level crater areas mainly on Isabela Island that frequently immerse into the trade inversion layer. With respect to the diurnal cycle, we found a lower cloud frequency over the islands in the evening than in the morning. Seasonally, cloud frequency is higher during the hot season (January–May) than in the cool season (June–December). However, spatial differences in cloudiness were more pronounced during the cool season months. We further analyzed two periods beyond average atmospheric forcing. During El Niño 2015, the cloud frequency was higher than usual, and differences between altitudes and aspects were less pronounced. La Niña 2007 led to negative anomalies in cloud frequency over the islands, with intensified differences between altitude and aspect.en
dc.description.sponsorshipDFG, 455480427, DynAmics of PRecipitation in transition: The Water source for the Galapagos ArchIpelago under Climate Change - DARWIN
dc.identifier.eissn2073-4433
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/19753
dc.identifier.urihttps://doi.org/10.14279/depositonce-18552
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften
dc.subject.othercloud frequency
dc.subject.otherclouds
dc.subject.otherGalapagos
dc.subject.otherENSO
dc.subject.otherMODIS
dc.titleThe Spatio-Temporal Cloud Frequency Distribution in the Galapagos Archipelago as Seen from MODIS Cloud Mask Data
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.articlenumber1225
dcterms.bibliographicCitation.doi10.3390/atmos14081225
dcterms.bibliographicCitation.issue8
dcterms.bibliographicCitation.journaltitleAtmosphere
dcterms.bibliographicCitation.originalpublishernameMDPI
dcterms.bibliographicCitation.originalpublisherplaceBasel
dcterms.bibliographicCitation.volume14
dcterms.rightsHolder.referenceCreative-Commons-Lizenz
tub.accessrights.dnbfree
tub.affiliationFak. 6 Planen Bauen Umwelt::Inst. Ökologie::FG Klimatologie
tub.publisher.universityorinstitutionTechnische Universität Berlin

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