FN Archimer Export Format PT J TI Thermal enhancement of gas transfer velocity of CO2 in an Amazon floodplain lake revealed by eddy covariance measurements BT AF POLSENAERE, Pierre DEBORDE, Jonathan DETANDT, Guillaume VIDAL, Luciana O. PEREZ, Marcela A. P. MARIEU, Vincent ABRIL, Gwenael AS 1:1;2:1;3:1;4:2;5:3;6:1;7:1,4; FF 1:;2:;3:;4:;5:;6:;7:; C1 Univ Bordeaux, Lab Environm & Paleoenvironm Ocean & Continentaux, CNRS UMR 5805, F-33405 Talence, France. Univ Fed Juiz de Fora, Aquat Ecol Lab, Juiz De Fora, MG, Brazil. Univ Fed Fluminense, Programa Geoquim Ambiental, Rio De Janeiro, Brazil. Inst Rech Dev, Lab Geosci & Environm Toulouse, Toulouse, France. C2 UNIV BORDEAUX, FRANCE UNIV FED JUIZ DE FORA, BRAZIL UNIV FED FLUMINENSE, BRAZIL IRD, FRANCE IF 4.456 TC 35 UR https://archimer.ifremer.fr/doc/00603/71532/69950.pdf LA English DT Article AB In November 2011, the partial pressures of carbon dioxide (pCO(2)) in water and air in a floodplain lake of the Amazon River in Brazil were 800 +/- 75 and 387 +/- 8 ppmv, respectively. Turbulent CO2 fluxes from the lake measured with eddy covariance ranged from 0.05 to 2.2 mmol m(-2) s(-1). The corresponding gas transfer velocities k(600) ranged from 1.3 to 31.6 cm h(-1), averaging 12.2 +/- 6.7 cm h(-1). At moderate to high wind speed, k(600) increased with wind speed, with values above parameterizations for other lake ecosystems. During the prevailing tropical low wind speed (below 2.7 m s(-1)) and high insolation conditions, unexpected high k(600) values (up to 20 cm h(-1)) were obtained and correlated with latent heat and sensible heat fluxes. In Amazonian open lakes, owing to long quiescent periods of low wind speed but extremely high daytime insolation and heat fluxes, thermal enhancement makes time-integrated gas transfer velocities four to five times higher than those computed from classic wind parameterization. PY 2013 PD MAY SO Geophysical Research Letters SN 0094-8276 PU Amer Geophysical Union VL 40 IS 9 UT 000320317500014 BP 1734 EP 1740 DI 10.1002/grl.50291 ID 71532 ER EF