Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.scitotenv.2022.157106 http://hdl.handle.net/11449/240737 |
Resumo: | Climate projections models indicate that longer periods of droughts are expected within the next 100 years in various parts of South America. To understand the effects of longer periods of droughts on aquatic environments, we investigated the response of chlorophyll-a (Chl-a) concentration to recent severe drought events in the Barra Bonita Hydroelectric Reservoir (BBHR) in São Paulo State, Brazil. We used satellite imagery to estimate the Chl-a concentration from 2014 to 2020 using the Slope Index (NRMSE of 18.92% and bias of -0.20 mg m-3). Ancillary data such as precipitation, water level and air temperature from the same period were also used. Drought events were identified using the standardized precipitation index (SPI). In addition, we computed the probability of future drought events. Two periods showed extremely dry conditions: 1) January-February (2014) and 2) April-May (2020). Both periods were characterized by a recurrence probability of 1in every 50 years. The highest correlation was observed between Chl-a concentration and SPI (-0.97) in 2014, while Chl-a had had the highest correlation with water level (-0.59) in 2020. These results provide new insights into the influence of extreme drought events on the Chl-a concentration in the BBHR and their relationship with other climate variables and reservoir water levels. Drought events imply less rainfall, higher temperatures, and atmospheric dryness, and these factors affect evaporation and the water levels in the reservoir. |
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Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periodsAlgae bloomExtreme eventsInland waters bodyRemote sensingClimate projections models indicate that longer periods of droughts are expected within the next 100 years in various parts of South America. To understand the effects of longer periods of droughts on aquatic environments, we investigated the response of chlorophyll-a (Chl-a) concentration to recent severe drought events in the Barra Bonita Hydroelectric Reservoir (BBHR) in São Paulo State, Brazil. We used satellite imagery to estimate the Chl-a concentration from 2014 to 2020 using the Slope Index (NRMSE of 18.92% and bias of -0.20 mg m-3). Ancillary data such as precipitation, water level and air temperature from the same period were also used. Drought events were identified using the standardized precipitation index (SPI). In addition, we computed the probability of future drought events. Two periods showed extremely dry conditions: 1) January-February (2014) and 2) April-May (2020). Both periods were characterized by a recurrence probability of 1in every 50 years. The highest correlation was observed between Chl-a concentration and SPI (-0.97) in 2014, while Chl-a had had the highest correlation with water level (-0.59) in 2020. These results provide new insights into the influence of extreme drought events on the Chl-a concentration in the BBHR and their relationship with other climate variables and reservoir water levels. Drought events imply less rainfall, higher temperatures, and atmospheric dryness, and these factors affect evaporation and the water levels in the reservoir.Institute of Science and Technology São Paulo State UniversityFederal Institute of Education Science and Technology of Brasília DFNational Institute of Education and Earth Observatory of Singapore Nanyang Technological UniversityLeibniz-Institute of Freshwater Ecology and Inland FisheriesNational Center for Monitoring and Early Warning of Natural Disasters (Cemaden)Institute of Science and Technology São Paulo State UniversityUniversidade Estadual Paulista (UNESP)DFNanyang Technological UniversityLeibniz-Institute of Freshwater Ecology and Inland FisheriesNational Center for Monitoring and Early Warning of Natural Disasters (Cemaden)Jang, Matheus Tae Geun [UNESP]Alcântara, Enner [UNESP]Rodrigues, ThananPark, EdwardOgashawara, IgorMarengo, José A2023-03-01T20:30:36Z2023-03-01T20:30:36Z2022-10-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article157106http://dx.doi.org/10.1016/j.scitotenv.2022.157106The Science of the total environment, v. 843, p. 157106-.1879-1026http://hdl.handle.net/11449/24073710.1016/j.scitotenv.2022.1571062-s2.0-85137008599Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengThe Science of the total environmentinfo:eu-repo/semantics/openAccess2023-03-01T20:30:36Zoai:repositorio.unesp.br:11449/240737Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:23:33.162880Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
title |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
spellingShingle |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods Jang, Matheus Tae Geun [UNESP] Algae bloom Extreme events Inland waters body Remote sensing |
title_short |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
title_full |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
title_fullStr |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
title_full_unstemmed |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
title_sort |
Increased chlorophyll-a concentration in Barra Bonita reservoir during extreme drought periods |
author |
Jang, Matheus Tae Geun [UNESP] |
author_facet |
Jang, Matheus Tae Geun [UNESP] Alcântara, Enner [UNESP] Rodrigues, Thanan Park, Edward Ogashawara, Igor Marengo, José A |
author_role |
author |
author2 |
Alcântara, Enner [UNESP] Rodrigues, Thanan Park, Edward Ogashawara, Igor Marengo, José A |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) DF Nanyang Technological University Leibniz-Institute of Freshwater Ecology and Inland Fisheries National Center for Monitoring and Early Warning of Natural Disasters (Cemaden) |
dc.contributor.author.fl_str_mv |
Jang, Matheus Tae Geun [UNESP] Alcântara, Enner [UNESP] Rodrigues, Thanan Park, Edward Ogashawara, Igor Marengo, José A |
dc.subject.por.fl_str_mv |
Algae bloom Extreme events Inland waters body Remote sensing |
topic |
Algae bloom Extreme events Inland waters body Remote sensing |
description |
Climate projections models indicate that longer periods of droughts are expected within the next 100 years in various parts of South America. To understand the effects of longer periods of droughts on aquatic environments, we investigated the response of chlorophyll-a (Chl-a) concentration to recent severe drought events in the Barra Bonita Hydroelectric Reservoir (BBHR) in São Paulo State, Brazil. We used satellite imagery to estimate the Chl-a concentration from 2014 to 2020 using the Slope Index (NRMSE of 18.92% and bias of -0.20 mg m-3). Ancillary data such as precipitation, water level and air temperature from the same period were also used. Drought events were identified using the standardized precipitation index (SPI). In addition, we computed the probability of future drought events. Two periods showed extremely dry conditions: 1) January-February (2014) and 2) April-May (2020). Both periods were characterized by a recurrence probability of 1in every 50 years. The highest correlation was observed between Chl-a concentration and SPI (-0.97) in 2014, while Chl-a had had the highest correlation with water level (-0.59) in 2020. These results provide new insights into the influence of extreme drought events on the Chl-a concentration in the BBHR and their relationship with other climate variables and reservoir water levels. Drought events imply less rainfall, higher temperatures, and atmospheric dryness, and these factors affect evaporation and the water levels in the reservoir. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-10-15 2023-03-01T20:30:36Z 2023-03-01T20:30:36Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.scitotenv.2022.157106 The Science of the total environment, v. 843, p. 157106-. 1879-1026 http://hdl.handle.net/11449/240737 10.1016/j.scitotenv.2022.157106 2-s2.0-85137008599 |
url |
http://dx.doi.org/10.1016/j.scitotenv.2022.157106 http://hdl.handle.net/11449/240737 |
identifier_str_mv |
The Science of the total environment, v. 843, p. 157106-. 1879-1026 10.1016/j.scitotenv.2022.157106 2-s2.0-85137008599 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
The Science of the total environment |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
157106 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129515319197696 |