| 1. Identificação | |
| Tipo de Referência | ePrint (Electronic Source) |
| Site | mtc-m16c.sid.inpe.br |
| Código do Detentor | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Repositório | sid.inpe.br/ePrint@80/2006/12.12.17.56 |
| Última Atualização | 2006:12.12.16.56.45 (UTC) administrator |
| Repositório de Metadados | sid.inpe.br/ePrint@80/2006/12.12.17.56.35 |
| Última Atualização dos Metadados | 2018:06.04.04.22.30 (UTC) administrator |
| Chave de Citação | CostaTelmNovo::SpLiAt |
| Título | Spectral light attenuation in Amazonian waters  |
| Projeto | Comportamento Espectral da Água - Processos a Hidrosfera |
| Data da Última Atualização | 2006-12-13 |
| Data de Acesso | 11 maio 2024 |
| Tipo de Suporte | On-line |
| Tipo Secundário | PRE PI |
| Número de Arquivos | 1 |
| Tamanho | 1069 KiB |
| 2. Contextualização | |
| Autor | 1 Costa, Maycira P. F. 2 Telmer, Kevin 3 Novo, E. M. L. M. |
| Grupo | 1 2 3 DSR-INPE-MCT-BR |
| Afiliação | 1 University of Victoria, Department of Geography, Canada 2 University of Victoria, School of Earth and Ocean Sciences, Victoria, Canada 3 Instituto Nacional de Pesquisas Espaciais (INPE) |
| Endereço de e-Mail do Autor | 1 maycira@offfice.geog.uvic.ca 2 3 evlyn@ltid.inpe.br |
| Endereço de e-Mail | evlyn@ltid.inpe.br |
| Publicação Alternativa | Limnology and Oceanography |
| Produtor | Instituto Nacional de Pesquisas Espaciais |
| Cidade | São José dos Campos |
| Estágio da Publicação Alternativa | submitted |
| Avanço | ePrint update |
| Histórico (UTC) | 2006-12-12 17:56:45 :: evlyn -> administrator :: 2007-11-28 19:26:37 :: administrator -> jefferson :: 2008-04-26 01:40:01 :: jefferson -> administrator :: 2018-06-04 04:22:30 :: administrator -> marciana :: |
| 3. Conteúdo e estrutura | |
| É a matriz ou uma cópia? | é a matriz |
| Estágio do Conteúdo | em andamento |
| Transferível | 1 |
| Palavras-Chave | water types attenuation coefficient scallar irradiance |
| Resumo | Amazonian waters are commonly classified coarsely as white, black, and clear, reflecting their differing composition of particulate and dissolved compounds. Accordingly, the water light field and the ecology of each of these water types also differ strongly. Recent changes in land use are causing changes in river water composition that cause shifts in the water light field. Consequently, the quality and distribution of ecological habitats must also be changing. We investigate and quantify changes in the light field by reporting the first in situ spectral diffuse attenuation and scalar irradiance measurements and accompanying water optical constituents, including pigments determined by HPLC, from a suite of large white, black, and clear rivers of the Amazon Basin. Using this dataset, we evaluate the potential shifts in the water light field of waters affected by thousands of small-scale gold miners. Sampling was done during the high-water period along a 500 km transect of the Amazon River and six of its larger tributaries. Water samples were collected from the subsurface and analyzed for chlorophyll a and other pigments, total suspended solids, and colored dissolved organic matter. At each station, vertical profiles of temperature, spectral downwelling irradiance and upwelling radiance were taken from the surface down to the depth of 1% light penetration (Zeu). Our results show that, for the different types of waters, the diffuse attenuation coefficient has different spectral and penetration depth behavior due to varying proportions of dissolved and particulate compounds. In white and black waters, the photosynthetic active radiation becomes spectrally dominated by red light as a result of the high attenuation by suspended sediments and colored dissolved organic matter, respectively. Blue radiation is non-existent below the 0.5 depth. This is not the case for clear waters, which exhibit a mid-spectra green light peak within the deep Zeu, and blue light in only attenuated by 2.5 m. Applying these results to clear waters that have been muddied by the injection of sediment from mining, we show that significant changes in the distribution of spectral scalar irradiance must occur, and that this would result in a decrease (i) in photosynthetic activity, (ii) in the production of organic matter photoproducts, (iii) in the size of clear water habitats, and shifts in biological communities. . |
| Área | SRE |
| Arranjo | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSR > Spectral light attenuation... |
| Conteúdo da Pasta doc | acessar |
| Conteúdo da Pasta source | não têm arquivos |
| Conteúdo da Pasta agreement | não têm arquivos |
| 4. Condições de acesso e uso | |
| URL dos dados | http://urlib.net/ibi/sid.inpe.br/ePrint@80/2006/12.12.17.56 |
| URL dos dados zipados | http://urlib.net/zip/sid.inpe.br/ePrint@80/2006/12.12.17.56 |
| Idioma | en |
| Arquivo Alvo | v1.pdf |
| Grupo de Usuários | administrator evlyn jefferson administrator |
| Visibilidade | shown |
| Permissão de Atualização | transferida para ePrint update |
| 5. Fontes relacionadas | |
| Unidades Imediatamente Superiores | 8JMKD3MGPCW/3ER446E |
| Acervo Hospedeiro | sid.inpe.br/mtc-m18@80/2008/03.17.15.17 |
| 6. Notas | |
| Campos Vazios | accessyear archivingpolicy archivist contenttype copyholder copyright creatorhistory descriptionlevel dissemination doi edition format identifier isbn issn label lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit readergroup readpermission resumeid rightsholder schedulinginformation secondarydate secondarykey secondarymark session shorttitle sponsor subject tertiarymark tertiarytype url versiontype year |
| 7. Controle da descrição | |
| e-Mail (login) | marciana |
| atualizar | |