Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake
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Academia Brasileira de Ciências
2017
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| author | LUCIANA P.M. BRANDÃO |
| author_facet | LUCIANA P.M. BRANDÃO |
| contents | Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake LUCIANA P.M. BRANDÃO LUDMILA S. BRIGHENTI PETER A. STAEHR FRANCISCO A.R. BARBOSA JOSÉ F. BEZERRA-NETO Multidisciplinaria (Ciencias Naturales y Exactas) CDOM tripton chlorophyll Kd partition light attenuation We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl- a and a CDOM (440) and their relative contribution to the diffuse PAR attenuation coefficient ( Kd ) was investigated at 21 sites (dry and wet seasons and two intermediate periods) and at monthly interval at 1 pelagic site. Higher values of Kd were observed during the mixing period, characterized by a higher concentration of tripton and Chl- a compared to the stratified rainy season. In the spatial sampling PAR attenuation was dominated by tripton absorption/scattering (average relative contribution of 79%), followed by Chl- a (average 11.6%). In the monthly sampling tripton and Chl- a accounted for most of the Kd with relative contributions of 47.8% and 35.6%, respectively. Multiple linear regression analysis showed that Chl- a and tripton in combination explained 97% of the monthly variation in Kd (p<0.001), but Chl- a had more influence (higher regression coefficient). Thus, although most of light attenuation was due to tripton, seasonal variations in phytoplankton abundance were responsible for most of the temporal fluctuations in Kd . 2017 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32751053009 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.89 |
| format | Artículo científico |
| id | redalyc_32751053009 |
| institution | Redalyc |
| language | en |
| publishDate | 2017 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake LUCIANA P.M. BRANDÃO Multidisciplinaria (Ciencias Naturales y Exactas) CDOM tripton chlorophyll Kd partition light attenuation Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake LUCIANA P.M. BRANDÃO LUDMILA S. BRIGHENTI PETER A. STAEHR FRANCISCO A.R. BARBOSA JOSÉ F. BEZERRA-NETO Multidisciplinaria (Ciencias Naturales y Exactas) CDOM tripton chlorophyll Kd partition light attenuation We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl- a and a CDOM (440) and their relative contribution to the diffuse PAR attenuation coefficient ( Kd ) was investigated at 21 sites (dry and wet seasons and two intermediate periods) and at monthly interval at 1 pelagic site. Higher values of Kd were observed during the mixing period, characterized by a higher concentration of tripton and Chl- a compared to the stratified rainy season. In the spatial sampling PAR attenuation was dominated by tripton absorption/scattering (average relative contribution of 79%), followed by Chl- a (average 11.6%). In the monthly sampling tripton and Chl- a accounted for most of the Kd with relative contributions of 47.8% and 35.6%, respectively. Multiple linear regression analysis showed that Chl- a and tripton in combination explained 97% of the monthly variation in Kd (p<0.001), but Chl- a had more influence (higher regression coefficient). Thus, although most of light attenuation was due to tripton, seasonal variations in phytoplankton abundance were responsible for most of the temporal fluctuations in Kd . 2017 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32751053009 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.89 |
| title | Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) CDOM tripton chlorophyll Kd partition light attenuation |
| url | https://www.redalyc.org/articulo.oa?id=32751053009 |