Temporal and spatial analysis of precipitation patterns in an Andean region of southern Ecuador using LAWR weather radar

Temporal and spatial analysis of precipitation patterns in an Andean region of southern Ecuador using LAWR weather radar
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使用 LAWR 天气雷达对厄瓜多尔南部安第斯地区降水模式进行时空分析

DOI:
10.1007/s00703-017-0535-8
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发表时间:
2017
影响因子:
2
通讯作者:
Bendix J
Bendix J
中科院分区:
地球科学4区
文献类型:
--
作者:
Oñate-Valdivieso F;Fries A;Mendoza K;Gonzalez-Jaramillo V;Pucha-Cofrep F;Rollenbeck R;Bendix J

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本文重点分析了降水模式,利用局地气象雷达收集了厄瓜多尔南部安第斯地区(Loja、Zamora和Catamayo城市)降水分布的信息。选取有代表性的54个事件,制作日降水图,获得与地形和季节相关的降水特征。结果表明,降水覆盖面积(racoefficiency)与季节有较强的相关性。一般来说,湿润气团来自东部(亚马逊盆地),但在主要的雨季(12月至4月),湿度也经常从西部(太平洋)进入研究区域。雨季的特点是对流降水,与南方夏季较高的蒸发率有关。相对干旱的季节在5月至11月之间形成,但由于亚马逊盆地的平流水汽输送,也记录了相当多的降水,这是主要的热带东风将湿度带到安第斯山脉东部陡坡的结果,通常遵循排水系统的自然过程。
This paper focuses on the analysis of precipitation patterns, using a Local Area Weather Radar to collect information about the precipitation distribution in an Andean region of southern Ecuador (cities of Loja, Zamora and Catamayo). 54 representative events were selected to develop daily precipitation maps and to obtain their relevant characteristics, which were related to the topography and the season. The results showed that a strong correlation between the areas covered by precipitation (RAcoefficient) and the season exists. In general, humid air masses come from the east (Amazon Basin), but during the main rainy season (December to April), humidity also frequently enters the study region from the west (Pacific Ocean). The rainy season is characterized by convective precipitation, associated with higher evaporation rates during austral summer. The relatively dry season is formed between May and November, but considerable precipitation amounts are registered, too, due to advective moisture transport from the Amazon Basin, a result of the predominant tropical easterlies carrying the humidity up the eastern escarpment of the Andes, generally following the natural course of the drainage systems.
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