Author:
Geiss Andrew,Marchand Roger
Abstract
Abstract. Linear temporal trends in cloud fraction over the extratropical oceans, observed by
NASA's Multi-angle Imaging SpectroRadiometer (MISR) during the period from
2000 to 2013, are examined in the context of coincident European Centre for
Medium-Range Weather Forecasts (ECMWF) reanalysis data using a maximum
covariance analysis. Changes in specific cloud types defined with respect to
cloud-top height and cloud optical depth are related to trends in reanalysis
variables. A pattern of reduced high-altitude optically thick cloud and
increased low-altitude cloud of moderate optical depth is found to be
associated with increased temperatures, geopotential heights, and
anti-cyclonic flow over the extratropical oceans. These and other trends in
cloud occurrence are shown to be correlated with changes in the El
Niño–Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO),
the North Pacific index (NPI), and the Southern Annular Mode (SAM).
Funder
Jet Propulsion Laboratory
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