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Modern Glacier Retreat On Kilimanjaro As Evidence Of Climate Change: Observations And Facts, Georg Kaser, Douglas R. Hardy, Thomas Molg, Raymond S. Bradley, Tharsis M. Hyera
Modern Glacier Retreat On Kilimanjaro As Evidence Of Climate Change: Observations And Facts, Georg Kaser, Douglas R. Hardy, Thomas Molg, Raymond S. Bradley, Tharsis M. Hyera
Raymond S Bradley
In recent years, Kilimanjaro and its vanishing glaciers have become an ‘icon’ of global warming, attracting broad interest. In this paper, a synopsis of (a) field observations made by the authors and (b) climatic data as reported in the literature (proxy and long-term instrumental data) is presented to develop a new concept for investigating the retreat of Kilimanjaro’s glaciers, based on the physical understanding of glacier–climate interactions. The concept considers the peculiarities of the mountain and implies that climatological processes other than air temperature control the ice recession in a direct manner. A drastic drop in atmospheric moisture at the …
Secular Fluctuations Of Temperature In The Rocky Mountain States And A Comparison With Precipitation Fluctuations, Raymond S. Bradley
Secular Fluctuations Of Temperature In The Rocky Mountain States And A Comparison With Precipitation Fluctuations, Raymond S. Bradley
Raymond S Bradley
Fluctuations of temperature in the Rocky Mountain states of Idaho. Montana. Wyoming. Colorado and Utah are analyzed forthe period 1891-1978. Prior to 1891. data forthis area are too sparse to make meaningful generalizations. After screening temperature data for homogeneity. selected records are used to map seasonal mean temperature departures from 1941-70 means. In all seasons. mean temperatures were higher by 1-I.soC during the last 40 years compared to the previous 40-50 years. However. spring and fall temperatures have been declining since the period maximum in the late 1930·s. Pentad mean winter and summer temperatures show a statistically significant temperature increase …
Secular Changes Of Precipitation In The Rocky Mountain States, Raymond S. Bradley
Secular Changes Of Precipitation In The Rocky Mountain States, Raymond S. Bradley
Raymond S Bradley
Long-term preCIpitation records from Montana, Idaho, Wyoming, Utah and western Colorado were obtained and carefully screened for missing data and station relocations. Each record was divided into five seasonal series and tested for homogeneity. Most of theunhomogeneous records were for the winter season, whereas there were fewest for summer and late summer seasons. Those seasonal records considered to be homogeneous were then used to examine the spatial variation of precipitation anomalies decade by decade (1891-1900, 1901-1910, etc.) from 1941-70 averages. Areas of statistically significant anomalies were identified. Generally, precipitation was high in the 1890's, 1910's and/or 1920's, 1940's and 1960's. …
Secular Climatic Fluctuations In Southwestern Colorado, Raymond S. Bradley, Roger G. Barry
Secular Climatic Fluctuations In Southwestern Colorado, Raymond S. Bradley, Roger G. Barry
Raymond S Bradley
Precipitation and temperature data since records began in southwestern Colorado arc analyzed on a seasonal basis. Interstation correlations for recent years indicate that the region responds fairly uniformly to seasonal variations in precipitation, but this was not true earlier this century when precipitation variability was higher. Changes in the dependence of precipitation on elevation are also shown. Annual precipitation totals were low about 1860, 1900, 1930-35 and 1950-55. Mean annual temperatures appear to have fallen from about 1867 to about 1930 when the trend reversed. Overall, the climate of southwestern Colorado in the 1860s appears to have been warmer and …