| Texto completo | |
| Autor(es): Mostrar menos - |
Ward, Nicholas D.
;
Sawakuchi, Henrique O.
;
Neu, Vania
;
Less, Diani F. S.
;
Valerio, Aline M.
;
Cunha, Alan C.
;
Kampel, Milton
;
Bianchi, Thomas S.
;
Krusche, Alex V.
;
Richey, Jeffrey E.
;
Keil, Richard G.
Número total de Autores: 11
|
| Tipo de documento: | Artigo Científico |
| Fonte: | LIMNOLOGY AND OCEANOGRAPHY LETTERS; v. 3, n. 3, p. 10-pg., 2018-06-01. |
| Resumo | |
Most measurements of respiration rates in large tropical rivers do not account for the influence of river flow conditions on microbial activity. We developed a ship-board spinning incubation system for measuring O-2 drawdown under different rotation velocities and deployed the system along the lower Amazon River during four hydrologic periods. Average respiration rates in incubation chambers rotated at 0.22 m s(-1) and 0.66 m s(-1) were 1.4 and 2.4 times higher than stationary chambers, respectively. On average, depth-integrated respiration rates in chambers spun at 0.22 m s(-1) and 0.66 m s(-1) accounted for 64%+/- 622% and 104%+/- 636% of CO2 outgassing rates, respectively, in mainstem sites. Continuous measurements of in situ pCO(2) were also made along with cross-channel profiles of river velocity. A positive correlation between river velocity and pCO(2) was observed along the lower river (r(2)=0.67-0.96) and throughout a tidal cycle. (AU) | |
| Processo FAPESP: | 08/58089-9 - The role of rivers on the regional carbon cycle |
| Beneficiário: | Maria Victoria Ramos Ballester |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático |