Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil
A regional investigation of precipitation extremes could help the local authorities to develop strategies against potential climatic disasters, especially in regions of large climate vulnerability. In this context, this study focused on the homogeneity and trend analysis of eleven extreme precipitat...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1071128/full |
| _version_ | 1798004202611408896 |
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| author | Isamara de Mendonça Silva Isamara de Mendonça Silva Deusdedit Monteiro Medeiros Deusdedit Monteiro Medeiros Meiry Sayuri Sakamoto João Bosco Verçosa Leal David Mendes David Mendes Tercio Ambrizzi |
| author_facet | Isamara de Mendonça Silva Isamara de Mendonça Silva Deusdedit Monteiro Medeiros Deusdedit Monteiro Medeiros Meiry Sayuri Sakamoto João Bosco Verçosa Leal David Mendes David Mendes Tercio Ambrizzi |
| author_sort | Isamara de Mendonça Silva |
| collection | DOAJ |
| description | A regional investigation of precipitation extremes could help the local authorities to develop strategies against potential climatic disasters, especially in regions of large climate vulnerability. In this context, this study focused on the homogeneity and trend analysis of eleven extreme precipitation indices from a daily rainfall dataset of rain gauges of the state of Ceará, located in the north of Northeast Brazil, from 1974 to 2018 at annual and seasonal time scales. The data were first submitted to gap-filling and quality control processes. Homogeneity, trend, and correlation coefficient were performed subsequently. Homogeneity results showed that most of the precipitation series were classified as “useful.” Significant break years in the series agreed well with moderate and very strong El Niño and La Niña events, suggesting a further investigation of this possible connection. Wet and dry day precipitation indices mainly indicated a decrease in the rainfall regime and an increase in dry days, mainly in the central-eastern, northwestern, and southern regions of the Ceará, especially during the annual time scale and the rainy season. The Locally Weighted Scatterplot Smoothing (LOWESS) curve showed changes in almost all series during the 1980s and 1990s, coinciding with the homogeneity breaks and years of severe droughts that strongly hit the region. Correlation coefficients were strong and significant between rainfall total index and the other precipitation indices. |
| first_indexed | 2024-04-11T12:19:56Z |
| format | Article |
| id | doaj.art-f5ac7c8af19348a4b16a6d721f530c63 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-11T12:19:56Z |
| publishDate | 2022-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-f5ac7c8af19348a4b16a6d721f530c632022-12-22T04:24:08ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-12-011010.3389/feart.2022.10711281071128Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of BrazilIsamara de Mendonça Silva0Isamara de Mendonça Silva1Deusdedit Monteiro Medeiros2Deusdedit Monteiro Medeiros3Meiry Sayuri Sakamoto4João Bosco Verçosa Leal5David Mendes6David Mendes7Tercio Ambrizzi8Climate Sciences Post-Graduate Program, Federal University of Rio Grande do Norte, Natal, RN, BrazilAtmospheric Research Laboratory, Federal University of Rio Grande do Norte, Natal, RN, BrazilAtmospheric Research Laboratory, Federal University of Rio Grande do Norte, Natal, RN, BrazilAerospace Engineering Post-Graduate Program, Federal University of Rio Grande do Norte, Natal, RN, BrazilResearch Institute for Meteorology and Water Resources, Fortaleza, CE, BrazilDepartment of Physics, Ceará State University, Fortaleza, CE, BrazilClimate Sciences Post-Graduate Program, Federal University of Rio Grande do Norte, Natal, RN, BrazilAerospace Engineering Post-Graduate Program, Federal University of Rio Grande do Norte, Natal, RN, BrazilInstitute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Cidade Universitária, São Paulo, SP, BrazilA regional investigation of precipitation extremes could help the local authorities to develop strategies against potential climatic disasters, especially in regions of large climate vulnerability. In this context, this study focused on the homogeneity and trend analysis of eleven extreme precipitation indices from a daily rainfall dataset of rain gauges of the state of Ceará, located in the north of Northeast Brazil, from 1974 to 2018 at annual and seasonal time scales. The data were first submitted to gap-filling and quality control processes. Homogeneity, trend, and correlation coefficient were performed subsequently. Homogeneity results showed that most of the precipitation series were classified as “useful.” Significant break years in the series agreed well with moderate and very strong El Niño and La Niña events, suggesting a further investigation of this possible connection. Wet and dry day precipitation indices mainly indicated a decrease in the rainfall regime and an increase in dry days, mainly in the central-eastern, northwestern, and southern regions of the Ceará, especially during the annual time scale and the rainy season. The Locally Weighted Scatterplot Smoothing (LOWESS) curve showed changes in almost all series during the 1980s and 1990s, coinciding with the homogeneity breaks and years of severe droughts that strongly hit the region. Correlation coefficients were strong and significant between rainfall total index and the other precipitation indices.https://www.frontiersin.org/articles/10.3389/feart.2022.1071128/fullprecipitationextreme indicesNortheast Brazildata qualityhomogeneitytrend analysis |
| spellingShingle | Isamara de Mendonça Silva Isamara de Mendonça Silva Deusdedit Monteiro Medeiros Deusdedit Monteiro Medeiros Meiry Sayuri Sakamoto João Bosco Verçosa Leal David Mendes David Mendes Tercio Ambrizzi Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil Frontiers in Earth Science precipitation extreme indices Northeast Brazil data quality homogeneity trend analysis |
| title | Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil |
| title_full | Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil |
| title_fullStr | Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil |
| title_full_unstemmed | Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil |
| title_short | Evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of Brazil |
| title_sort | evaluating homogeneity and trends in extreme daily precipitation indices in a semiarid region of brazil |
| topic | precipitation extreme indices Northeast Brazil data quality homogeneity trend analysis |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1071128/full |
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