نتایج جستجو برای: multidecadal variation
تعداد نتایج: 297749 فیلتر نتایج به سال:
Abstract This study explores the possible drivers of recent Hadley circulation strengthening in modern reanalyses. Predominantly, two generations reanalyses provided by European Centre for Medium-Range Weather Forecasts are used: fifth-generation atmospheric reanalysis (ERA5) and interim (ERA-Interim). Some results also evaluated against other long-term To assess origins cell (HC) strength vari...
Comparisons are made of long-term empirical and model-estimated patterns of solar irradiance forcing during a 200-year period (1650-1850), which precedes any apparent anthropogenic influence on climate. This interval encompasses a considerable range (approximately 4 W/m) of estimated variation in solar output, including the ‘‘Maunder’’ and ‘‘Dalton’’ Minima of solar irradiance, and an interveni...
Abstract. Climate variability on multidecadal timescales appears to be organized in pronounced patterns with clear expressions sea surface temperature, such as the Atlantic Multidecadal Variability and Pacific Decadal Oscillation. These are now well studied both observations global climate models important attribution of change. Results from CMIP5 have indicated large biases these consequences ...
Droughts are probably the natural hazard with the highest socioeconomic impact. Simultaneously, they are a very complex phenomenon; they are triggered by a diversity of physical factors and occur at a variety of time scales. Consequently, the instrumental record currently available is too short and the characterization of its multidecadal variability requires the use of natural proxies (tree ri...
We report measurements and analysis of a boreal forest fire, integrating the effects of greenhouse gases, aerosols, black carbon deposition on snow and sea ice, and postfire changes in surface albedo. The net effect of all agents was to increase radiative forcing during the first year (34 +/- 31 Watts per square meter of burned area), but to decrease radiative forcing when averaged over an 80-y...
Solar forcing on climate has been reported in several studies although the evidence so far remains inconclusive. Here, we analyze the stream flow of one of the largest rivers in the world, the Paraná in southeastern South America. For the last century, we find a strong correlation with the sunspot number, in multidecadal time scales, and with larger solar activity corresponding to larger stream...
Tide gauges provide a rich, long-term, record of the amplitude and spatiotemporal structure interannual to multidecadal coastal sea-level variability, including that related North American east coast sea level “hotspots.” Here, using wavelet analyses, we find evidence for epochs enhanced decadal (10–15 year period) variability at almost all long (70 years) tide gauge records. Within this freque...
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