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Full-Text Articles in Earth Sciences
Climate Variability In The Andes Of Ecuador And Its Relation To Tropical Pacific And Atlantic Sea Surface Temperature Anomalies, Mathias Vuille, Raymond S. Bradley, Frank Keimig
Climate Variability In The Andes Of Ecuador And Its Relation To Tropical Pacific And Atlantic Sea Surface Temperature Anomalies, Mathias Vuille, Raymond S. Bradley, Frank Keimig
Raymond S Bradley
The main spatiotemporal modes of seasonal precipitation and temperature variability in the Andes of Ecuador (1N–4S) and their relation to tropical Pacific and Atlantic sea surface temperature anomalies (SSTAs) between 1963–92 are identified based on rotated principal component analysis and cross-correlation techniques. Outgoing longwave radiation composites are analyzed during periods of strong oceanic forcing to confirm the proposed physical mechanisms. Despite the close proximity to the Pacific, precipitation variability in the Andes of Ecuador is not related to SSTA in the tropical Pacific domain alone. The El Nin˜o–Southern Oscillation influence is most dominant in the northwestern part of the Andes …
The Relationship Of Cloud Cover To Near-Surface Temperature And Humidity: Comparison Of Gcm Simulations With Empirical Data, Pavel Ya. Groisman, Raymond S. Bradley, Bomin Sun
The Relationship Of Cloud Cover To Near-Surface Temperature And Humidity: Comparison Of Gcm Simulations With Empirical Data, Pavel Ya. Groisman, Raymond S. Bradley, Bomin Sun
Raymond S Bradley
One of the possible ways to check the adequacy of the physical description of meteorological elements in global climate models (GCMs) is to compare the statistical structure of these elements reproduced by models with empirical data from the world climate observational system. The success in GCM development warranted a further step in this assessment. The description of the meteorological element in the model can be considered adequate if, with a proper reproduction of the mean and variability of this element (as shown by the observational system), the model properly reproduces the internal relationships between this element and other climatic variables …
Northern Hemisphere Temperatures During The Past Millennium: Inferences, Uncertainties, And Limitations, M. E. Mann, Raymond S. Bradley, M. K. Hughes
Northern Hemisphere Temperatures During The Past Millennium: Inferences, Uncertainties, And Limitations, M. E. Mann, Raymond S. Bradley, M. K. Hughes
Raymond S Bradley
Building on recent studies, we attempt hemispheric temperature reconstructions with proxy data networks for the past millennium. We focus not just on the reconstructions, but the uncertainties therein, and important caveats. Though expanded uncertainties prevent decisive conclusions for the period prior to AD 1400, our results suggest that the latter 20th century is anomalous in the context of at least the past millennium. The 1990s was the warmest decade, and 1998 the warmest year, at moderately high levels of confidence. The 20th century warming counters a millennial‐scale cooling trend which is consistent with long‐term astronomical forcing.