کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5753535 1620481 2018 52 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Autocorrelation structure of convective rainfall in semiarid-arid climate derived from high-resolution X-Band radar estimates
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Autocorrelation structure of convective rainfall in semiarid-arid climate derived from high-resolution X-Band radar estimates
چکیده انگلیسی
Small scale rainfall variability is a key factor driving runoff response in fast responding systems, such as mountainous, urban and arid catchments. In this paper, the spatial-temporal autocorrelation structure of convective rainfall is derived with extremely high resolutions (60 m, 1 min) using estimates from an X-Band weather radar recently installed in a semiarid-arid area. The 2-dimensional spatial autocorrelation of convective rainfall fields and the temporal autocorrelation of point-wise and distributed rainfall fields are examined. The autocorrelation structures are characterized by spatial anisotropy, correlation distances ~ 1.5-2.8 km and rarely exceeding 5 km, and time-correlation distances ~ 1.8-6.4 min and rarely exceeding 10 min. The observed spatial variability is expected to negatively affect estimates from rain gauges and microwave links rather than satellite and C-/S-Band radars; conversely, the temporal variability is expected to negatively affect remote sensing estimates rather than rain gauges. The presented results provide quantitative information for stochastic weather generators, cloud-resolving models, dryland hydrologic and agricultural models, and multi-sensor merging techniques.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Research - Volume 200, 1 February 2018, Pages 126-138
نویسندگان
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