scholarly journals Review of “Temporal and spatial evaluation of satellite-based rainfall estimates across the complex topographical and climatic gradients of Chile” by Zambrano-Bigiarini et al.

2016 ◽  
Author(s):  
Anonymous
2018 ◽  
Vol 213 ◽  
pp. 34-50 ◽  
Author(s):  
Oscar Manuel Baez-Villanueva ◽  
Mauricio Zambrano-Bigiarini ◽  
Lars Ribbe ◽  
Alexandra Nauditt ◽  
Juan Diego Giraldo-Osorio ◽  
...  

2013 ◽  
Vol 28 (6) ◽  
pp. 1478-1497 ◽  
Author(s):  
Luciana K. Cunha ◽  
James A. Smith ◽  
Mary Lynn Baeck ◽  
Witold F. Krajewski

Abstract Dual-polarization radars are expected to provide better rainfall estimates than single-polarization radars because of their ability to characterize hydrometeor type. The goal of this study is to evaluate single- and dual-polarization radar rainfall fields based on two overlapping radars (Kansas City, Missouri, and Topeka, Kansas) and a dense rain gauge network in Kansas City. The study area is located at different distances from the two radars (23–72 km for Kansas City and 104–157 km for Topeka), allowing for the investigation of radar range effects. The temporal and spatial scales of radar rainfall uncertainty based on three significant rainfall events are also examined. It is concluded that the improvements in rainfall estimation achieved by polarimetric radars are not consistent for all events or radars. The nature of the improvement depends fundamentally on range-dependent sampling of the vertical structure of the storms and hydrometeor types. While polarimetric algorithms reduce range effects, they are not able to completely resolve issues associated with range-dependent sampling. Radar rainfall error is demonstrated to decrease as temporal and spatial scales increase. However, errors in the estimation of total storm accumulations based on polarimetric radars remain significant (up to 25%) for scales of approximately 650 km2.


2022 ◽  
pp. 106014
Author(s):  
Anastasios-Petros Kazamias ◽  
Marios Sapountzis ◽  
Konstantinos Lagouvardos

2021 ◽  
Vol 9 (1) ◽  
pp. 69
Author(s):  
Maxsuel Bezerra Do Nascimento ◽  
Gustavo Fernando Santos ◽  
Tássio Jordan Rodrigues Dantas da Silva ◽  
Linaldo Freire Silva ◽  
José Ludemario da Silva Medeiros ◽  
...  

<div class="WordSection1"><p>O Nordeste Brasileiro é uma das regiões mais problemáticas no que se refere à disponibilidade de água, portanto, se tem necessidade de atentar a práticas e métodos para desenvolvimento dessa região, visto que as condições climáticas, a hidrologia e sua vegetação são de extrema importância para compreender como esse ambiente se forma. O objetivo principal deste trabalho é verificar e avaliar a variabilidade climática da microrregião de Sousa, através da análise espaço-temporal mensal e anual da sua precipitação, identificando-se, assim, os períodos secos e chuvosos da área estudada com o auxílio do Índice de Anomalia de Chuva (IAC). Os dados pluviométricos utilizados na pesquisa correspondem às séries mensais de precipitação no período de 1994 a 2017 fornecidos pela AESA, para a avaliação temporal, espacial e para o cálculo do Índice de Anomalia de Chuva (IAC). A microrregião de Sousa apresenta dois períodos distintos, um período de cinco meses chuvosos e outro com sete meses secos. A distribuição espacial da precipitação da microrregião possui áreas bem distintas, onde a maior concentração de precipitação se localiza na parte sudoeste, em contrapartida, a região noroeste e em um ponto na parte central apresentaram valores baixos de precipitação.</p><p><strong>Palavras-chave:</strong> Períodos Secos, Períodos Chuvosos e Índice de Anomalia de Chuva.</p><p> </p><p align="center">STUDY OF SPACE-TIME PLUVIOMETRIC VARIABILITY IN THE SOUSA MICROREGION, PARAÍBA</p><p><strong>Abstract</strong></p><p>The Brazilian Northeast is one of the most problematic regions in terms of water availability. Therefore, it is necessary to consider the practices and methods for the development of this region, since climatic conditions, hydrology and vegetation are of extreme importance to understand how this environment is formed. The main objective of this work is to verify and evaluate the climatic variability of the Sousa microregion, through the monthly and annual space-time analysis of its precipitation, thus identifying the dry and rainy periods of the studied area with the aid of the Anomaly Index Rainfall (IAC). The rainfall data used in the research correspond to the monthly rainfall series from 1994 to 2017 provided by the EFSA for the temporal and spatial evaluation and for the calculation of the Rainfall Anomaly Index (IAC). The Sousa microregion has two distinct periods, one period of five rainy months and the other with seven dry months. This work has a relevance in the area of ecology, which through the results help to collaborate with the development of the microregion, which through its managers dominate the knowledge of the stations pointed to abundance and water scarcity for the anthropic activities.</p><p><strong>Key-words: </strong>Dry Periods, Rainy Periods, and Rain Anomaly Index.</p></div>


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