@Article{RudorffMelMacBarNov:2011:SeSpVa,
author = "Rudorff, Conrado de Moraes and Melack, John M. and MacIntyre,
Sally and Barbosa, Claudio Clemente Faria and Novo, Evlyn
M{\'a}rcia Le{\~a}o de Moraes",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and Bren School
of Environmental Science and Management, University of California
and Marine Science Institute, University of California and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Seasonal and spatial variability of CO2 emission from a large
floodplain lake in the lower Amazon",
journal = "Journal of Geophysical Research",
year = "2011",
volume = "116",
number = "G04007",
pages = "1--12",
month = "Oct.",
keywords = "carbon-dioxide, methane, river, exchange, waters, budget, Brazil,
layer.",
abstract = "he inundation status of the Amazon floodplain affects biogenic gas
production and evasion. We analyzed spatial variability of
dissolved CO(2) concentration and gas evasion in a large
floodplain lake in the lower reach of the Amazon River in four
hydrological phases. We calculated surficial CO(2) concentrations
from measurements of pH, dissolved inorganic carbon, temperature,
and conductivity and used meteorological data to calculate gas
transfer coefficients to estimate CO(2) evasion. Gas transfer
coefficients that take into account both wind and heating and
cooling at the lake's surface are on the order of 10 cm hr(-1),
approximately four times higher than values previously used in
regional estimates of gas evasion from lakes on the Amazon
floodplain. Supersaturation of CO(2) occurred throughout the lake
and was higher in the littoral zone and in regions receiving
Amazon River inflows. CO(2) concentration was reduced in regions
with phytoplankton blooms. The range of CO(2) concentrations was
least at low water, 47 mu M to 233 mu M, and largest at high
water, 1 mu M to 656 mu M; the average annual value was 125 mu M.
We estimate mean (+/- standard deviation) fluxes from open-water
in L. Curuai to the atmosphere of 44 +/- 15, 348 +/- 13, 371 +/-
23, and 364 +/- 20 mmol CO(2) m(-2) d(-1) during receding, low,
rising, and high water, respectively. The error associated with
these values reflects, for each hydrological phase, the spatial
variation in CO(2) concentration in L. Curuai, a likely range in
atmospheric CO(2) levels and temporal variations in gas transfer
coefficient within 10-day periods.",
doi = "10.1029/2011JG001699",
url = "http://dx.doi.org/10.1029/2011JG001699",
issn = "0148-0227 and 2156-2202",
label = "lattes: 9857505876280820 5 RudorffMelMacBarNov:2011:SeSpVa",
language = "en",
targetfile = "jgrg836.pdf",
urlaccessdate = "28 mar. 2024"
}