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Satellite and surface observations of Nauru Island clouds: Differences between El Nino and La Nina periods
Author(s) -
Porch William M.,
Olsen Seth C.,
Chylek Petr,
Dubey Manvendra K.,
Henderson Bradley G.,
Clodius William
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026339
Subject(s) - la niña , cloud cover , boundary layer , climatology , cloud condensation nuclei , subsidence , geology , environmental science , atmospheric sciences , el niño southern oscillation , oceanography , meteorology , cloud computing , geography , aerosol , geomorphology , physics , structural basin , computer science , thermodynamics , operating system
Island cloud trails represent only a small fraction of ocean boundary layer clouds. However, they can be an important key to understanding how marine boundary layer clouds respond to perturbation. During the La Niña period of 1999–2001 the island cloud of Nauru demonstrated daytime persistence over 100 kilometers. Our results show that boundary layer clouds over the eastern margin of the warm pool are affected by regional subsidence and lack of CCN (Cloud Condensation Nuclei) during this active warm pool convection phase of the ENSO (El Nino Southern Oscillation). The increased persistence of boundary layer clouds during the day, as reflected by the island cloud trails, combined with the dissipation of boundary layer clouds at night contribute to cooling the ocean surface. During La Nina, boundary layer cloudiness around Nauru decreased by a factor of 1.9 and SSTs decreased by about 3°C.