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		<doi>10.1029/2011JG001699</doi>
		<issn>0148-0227</issn>
		<issn>2156-2202</issn>
		<label>lattes: 9857505876280820 5 RudorffMelMacBarNov:2011:SeSpVa</label>
		<citationkey>RudorffMelMacBarNov:2011:SeSpVa</citationkey>
		<title>Seasonal and spatial variability of CO2 emission from a large floodplain lake in the lower Amazon</title>
		<project>FAPESP (2003/06999-8; 2002/09911-1); CNPq (55.0301/02-0);  CAPES (1705-07-5)</project>
		<year>2011</year>
		<month>Oct.</month>
		<typeofwork>journal article</typeofwork>
		<secondarytype>PRE PI</secondarytype>
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		<author>Rudorff, Conrado de Moraes,</author>
		<author>Melack, John M.,</author>
		<author>MacIntyre, Sally,</author>
		<author>Barbosa, Claudio Clemente Faria,</author>
		<author>Novo, Evlyn Márcia Leão de Moraes,</author>
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		<group>DSR-OBT-INPE-MCT-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Bren School of Environmental Science and Management, University of California</affiliation>
		<affiliation>Marine Science Institute, University of California</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress>cmr@ltid.inpe.br</electronicmailaddress>
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		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>claudio@dpi.inpe.br</electronicmailaddress>
		<electronicmailaddress>evlyn@ltid.inpe.br</electronicmailaddress>
		<e-mailaddress>evlyn@ltid.inpe.br</e-mailaddress>
		<journal>Journal of Geophysical Research</journal>
		<volume>116</volume>
		<number>G04007</number>
		<pages>1-12</pages>
		<secondarymark>B1_ASTRONOMIA_/_FÍSICA B2_CIÊNCIA_DA_COMPUTAÇÃO A1_CIÊNCIAS_AGRÁRIAS_I A1_ECOLOGIA_E_MEIO_AMBIENTE A1_ENGENHARIAS_I A2_ENGENHARIAS_II A1_ENGENHARIAS_III A2_ENGENHARIAS_IV A1_GEOCIÊNCIAS A1_INTERDISCIPLINAR</secondarymark>
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		<keywords>carbon-dioxide, methane, river, exchange, waters, budget, Brazil, layer.</keywords>
		<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.</abstract>
		<area>SRE</area>
		<language>en</language>
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