Consulta: subjectFacets:"Net primary productivity"
Registros recuperados: 2
Data/hora: 09/06/2024 09:27:10

Effects of phytoplankton community composition and productivity on sea surface pCO(2) variations in the Southern Ocean
Provedor de dados: 5
Autores: Takao, Shintaro; Nakaoka, Shin-ichiro; Hashihama, Fuminori; Shimada, Keishi; Yoshikawa-inoue, Hisayuki; Hirawake, Toru; Kanda, Jota; Hashida, Gen; Suzuki, Koji.
The Southern Ocean is a vast net sink for atmospheric carbon dioxide (CO2), with marine phytoplankton playing a crucial role in CO2 fixation. We assessed how changes in the dominant phytoplankton community and net primary productivity (NPP) affected variations in the partial pressure of CO2 in surface water (pCO(2)(sw)) in the Indian sector of the Southern Ocean during austral summer. pCO2sw was negatively correlated with total phytoplankton and diatom abundances, as estimated from pigment signatures, in the zone south of the Antarctic Circumpolar Current; however, pCO(2)(sw) was not correlated with haptophyte abundance. Additionally, a stronger correlation was found between pCO(2)(sw) and total phytoplankton NPP than between chlorophyll a concentration...
Tipo: Text
Palavras-chave: Phytoplankton community composition; Diatoms; Southern Ocean; Net primary productivity; Carbon dioxide.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00676/78836/81084.pdf

Dissolved inorganic carbon and metabolism of an eutrophic lacustrine system: variations from a 36-hours study
Provedor de dados: 57
Autores: PEDROSA,P.; REZENDE,C. E.
Based on variations of pelagial dissolved inorganic carbon (DIC) concentrations this article provides estimations of net primary productivity and net mineralization -- net carbon metabolism -- in Cima Lake (Rio de Janeiro State). DIC concentrations varied from 203 to 773 µmol L-1 and %CO2(aq) (saturation) from 339 to 4,901. Net carbon metabolism per light/dark periods from the 36 hours of study ranged, respectively, from -556 to 503 mmol DIC m-2 12 h-1. Marked variations in daily net carbon metabolism of the lake were also observed. The values ranged from -25 to -194 mmol DIC m-2 day-1. The findings were discussed as indicators of dynamic biological behavior toward production or mineralization of organic matter in the system. And, the system seemed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DIC; Carbon metabolism; Net primary productivity; Mineralization; Eutrophic lake.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400010