Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017

During recent decades East Africa (EA) and Southern Africa (SA) have experienced an intensification of hydrological hazards, such as floods and droughts, which have dramatically affected the population, making these areas two of the regions of the African continent most vulnerable to these hazards....

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Autores principales:	Elsa Cattani, Olivia Ferguglia, Andrés Merino, Vincenzo Levizzani
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Africa precipitation long-term data sets satellite intercomparison Science Q
Acceso en línea:	https://doaj.org/article/e7343263aa124519bc86d4977f71f6d6
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id	oai:doaj.org-article:e7343263aa124519bc86d4977f71f6d6
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spelling	oai:doaj.org-article:e7343263aa124519bc86d4977f71f6d62021-11-11T18:56:02ZPrecipitation Products’ Inter–Comparison over East and Southern Africa 1983–201710.3390/rs132144192072-4292https://doaj.org/article/e7343263aa124519bc86d4977f71f6d62021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4419https://doaj.org/toc/2072-4292During recent decades East Africa (EA) and Southern Africa (SA) have experienced an intensification of hydrological hazards, such as floods and droughts, which have dramatically affected the population, making these areas two of the regions of the African continent most vulnerable to these hazards. Thus, precipitation monitoring and the evaluation of its variability have become fundamentally important actions through the analysis of long-term data records. In particular, satellite-based precipitation products are often used because they counterbalance the sparsity of the rain gauge networks which often characterize these areas. The aim of this work is to compare and contrast the capabilities of three daily satellite-based products in EA and SA from 1983 to 2017. The selected products are two daily rainfall datasets based on high-resolution thermal infrared observations, TAMSAT version 3 and CHIRPS, and a relatively new global product, MSWEP version 2.2, which merges satellite-based, rain gauge and re-analysis precipitation data. The datasets have been directly intercompared, avoiding the traditional rain gauge validation. This is done by means of pairwise comparison statistics at 0.25° spatial resolution and daily time scale to assess rain–detection and quantitative estimate capabilities. Monthly climatology and spatial distribution of seasonality are analyzed as well. The time evolution of the statistical indexes has been evaluated in order to analyze the stability of the rain detection and estimation performances. Considerable agreement among the precipitation products emerged from the analysis, in spite of the differences occurring in specific situations over complex terrain, such as mountainous and coastal regions and deserts. Moreover, the temporal evolution of the statistical indices has demonstrated that the agreement between the products improved over time, with more stable capabilities in identifying precipitating days and estimating daily precipitation starting in the second half of the 1990s.Elsa CattaniOlivia FergugliaAndrés MerinoVincenzo LevizzaniMDPI AGarticleAfricaprecipitationlong-term data setssatelliteintercomparisonScienceQENRemote Sensing, Vol 13, Iss 4419, p 4419 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Africa precipitation long-term data sets satellite intercomparison Science Q
spellingShingle	Africa precipitation long-term data sets satellite intercomparison Science Q Elsa Cattani Olivia Ferguglia Andrés Merino Vincenzo Levizzani Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
description	During recent decades East Africa (EA) and Southern Africa (SA) have experienced an intensification of hydrological hazards, such as floods and droughts, which have dramatically affected the population, making these areas two of the regions of the African continent most vulnerable to these hazards. Thus, precipitation monitoring and the evaluation of its variability have become fundamentally important actions through the analysis of long-term data records. In particular, satellite-based precipitation products are often used because they counterbalance the sparsity of the rain gauge networks which often characterize these areas. The aim of this work is to compare and contrast the capabilities of three daily satellite-based products in EA and SA from 1983 to 2017. The selected products are two daily rainfall datasets based on high-resolution thermal infrared observations, TAMSAT version 3 and CHIRPS, and a relatively new global product, MSWEP version 2.2, which merges satellite-based, rain gauge and re-analysis precipitation data. The datasets have been directly intercompared, avoiding the traditional rain gauge validation. This is done by means of pairwise comparison statistics at 0.25° spatial resolution and daily time scale to assess rain–detection and quantitative estimate capabilities. Monthly climatology and spatial distribution of seasonality are analyzed as well. The time evolution of the statistical indexes has been evaluated in order to analyze the stability of the rain detection and estimation performances. Considerable agreement among the precipitation products emerged from the analysis, in spite of the differences occurring in specific situations over complex terrain, such as mountainous and coastal regions and deserts. Moreover, the temporal evolution of the statistical indices has demonstrated that the agreement between the products improved over time, with more stable capabilities in identifying precipitating days and estimating daily precipitation starting in the second half of the 1990s.
format	article
author	Elsa Cattani Olivia Ferguglia Andrés Merino Vincenzo Levizzani
author_facet	Elsa Cattani Olivia Ferguglia Andrés Merino Vincenzo Levizzani
author_sort	Elsa Cattani
title	Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
title_short	Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
title_full	Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
title_fullStr	Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
title_full_unstemmed	Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017
title_sort	precipitation products’ inter–comparison over east and southern africa 1983–2017
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e7343263aa124519bc86d4977f71f6d6
work_keys_str_mv	AT elsacattani precipitationproductsintercomparisonovereastandsouthernafrica19832017 AT oliviaferguglia precipitationproductsintercomparisonovereastandsouthernafrica19832017 AT andresmerino precipitationproductsintercomparisonovereastandsouthernafrica19832017 AT vincenzolevizzani precipitationproductsintercomparisonovereastandsouthernafrica19832017
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Precipitation Products’ Inter–Comparison over East and Southern Africa 1983–2017

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