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J. Cuxart J. Cunillera M. A. Jiménez D. Martínez F. Molinos J. L. Palau 《Boundary-Layer Meteorology》2012,143(1):143-158
If no well-defined synoptic pressure gradients exist over a basin, flows can develop at a variety of scales, the main generators
of circulations being spatial thermal differences. These dynamics are studied for the eastern Ebro basin, at the north-eastern
part of the Iberian Peninsula, almost isolated from the surrounding areas by mountain ranges. The main tool for the study
is the new RASS-Sodar by Scintec, the WindRASS, which combines sound and radio waves to provide profiles of wind and virtual
temperature up to 360 m above the ground in the present configuration. One year of operation shows that low-level jets are
found routinely, their maximum speed being at a height below 500 m above ground level. The jets are from a constant direction
for several hours over the whole observed column, with rapid transitions between these periods. They allow for efficient heat
transport at the basin scale and are good producers of vertical mixing due to the strong wind shear. In summer the irrigated
plain has larger thermal contrast with the dry slopes, and the winds are stronger than in winter, when katabatic flows can
develop at night and usually radiation fog appears and may last for days. 相似文献
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Tayyebi Saeid M. Pastor Manuel Stickle Miguel M. Yage ngel Manzanal Diego Molinos Miguel Navas Pedro 《Landslides》2022,19(2):421-435
Landslides - Rapid flow-like landslides, particularly debris flows and debris avalanches, cause significant economic damage and many victims worldwide every year. They are usually extremely fast... 相似文献
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Large-scale climatic variability exerts a strong influence on local-scale environmental patterns and processes. However, disentangling the effects of global climate forcing from observed patterns in local processes requires robust understanding of the underlying patterns of temporal variability and consideration of the specific setting in which these processes take place. Here, we examine the influence of intermediate-scale environmental factors in modulating the effects of the North Atlantic Oscillation (NAO) on long-term water level dynamics in natural lakes. Lakes are ideal systems to study these relationships because of their acute sensitivity to environmental change and their linkages with multi-scale processes through the hydrological cycle. Using a novel combination of analytical tools, we show that the coupling between the NAO and water level dynamics is markedly nonstationary (i.e., time-frequency variant) and strongly lake-specific, filtered through the particular weather and environmental settings of lakes and their catchments. We conclude that to fully understand the nonstationary interplay between climate and ecology, we need first to disentangle the intermediate links between climate and different embedded environmental factors related to the process of interest. This knowledge should enhance significantly our ability to produce adequate long-term water resource management strategies, to preserve biological diversity and to achieve sustainable development under a globally changing climate. 相似文献
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