Temporal variation in methane emissions in a shallow lake at a southern mid latitude during high and low rainfall periods.
The global methane (CH4) emission of lakes is estimated at between 6 and 16 % of total natural CH4emissions. However, these values have a high uncertainty due to the wide variety of lakes with important differences in their morphological, biological, and physicochemical parameters and the relatively scarse data from southern mid-latitude lakes. For these reasons, we studied CH4fluxes and CH4dissolved in water in a typical shallow lake in the Pampean Wetland, Argentina, during four periods of consecutive years (April 2011-March 2015) preceded by different rainfall conditions. Other water physicochemical parameters were measured and meteorological data were reported. We identified three different states of the lake throughout the study as the result of the irregular alternation between high and low rainfall periods, with similar water temperature values but with important variations in dissolved oxygen, chemical oxygen demand, water turbidity, electric conductivity, and water level. As a consequence, marked seasonal and interannual variations occurred in CH4dissolved in water and CH4fluxes from the lake. These temporal variations were best reflected by water temperature and depth of the Secchi disk, as a water turbidity estimation, which had a significant double correlation with CH4dissolved in water. The mean CH4fluxes values were 0.22 and 4.09 mg/m2/h for periods with low and high water turbidity, respectively. This work suggests that water temperature and turbidity measurements could serve as indicator parameters of the state of the lake and, therefore, of its behavior as either a CH4source or sink.
CIFICEN-UNCPBA-CICPBA-CONICET - Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Pinto 399, 7000, Tandil, Argentina.
Victoria S
VS
Fusé
CIFICEN-UNCPBA-CICPBA-CONICET - Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Pinto 399, 7000, Tandil, Argentina.
M Eugenia
ME
Priano
UNCPBA - Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, 7000, Tandil, Argentina.
Karen E
KE
Williams
CONICET - Consejo Nacional de Investigaciones Científicas y Tecnológicas, Av. Rivadavia 1917, C1033AAJ, CABA, Argentina.
José I
JI
Gere
UNCPBA - Universidad Nacional del Centro de la Provincia de Buenos Aires, Pinto 399, 7000, Tandil, Argentina.
Sergio A
SA
Guzmán
CONICET - Consejo Nacional de Investigaciones Científicas y Tecnológicas, Av. Rivadavia 1917, C1033AAJ, CABA, Argentina.
Roberto
R
Gratton
CIFICEN-UNCPBA-CICPBA-CONICET - Centro de investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Pinto 399, 7000, Tandil, Argentina. pjuliarena@exa.unicen.edu.ar.
M Paula
MP
Juliarena
D000393:Air Pollutants / Q000032:analysis*; D001118:Argentina; D002980:Climate; D004784:Environmental Monitoring; D017752:Greenhouse Effect; D060106:Lakes / Q000737:chemistry*; D008697:Methane / Q000032:analysis*; D011891:Rain; D012621:Seasons; D012996:Solutions; D013696:Temperature; D014867:Water; D053833:Wetlands
D000393:Air Pollutants; D012996:Solutions; D014867:Water; D008697:Methane
Greenhouse gases; Lake ecology; Methane dissolved in water; Methane production/fluxes; Shallow lake; Water turbidity
Environ Sci Pollut Res Int. 2015 Sep;22(17):12992-3003
25916473
Environ Sci Technol. 2003 Feb 15;37(4):772-80
12636278
Res Microbiol. 2011 Nov;162(9):832-47
21704700
Math Biosci Eng. 2008 Oct;5(4):691-711
19278276
Nature. 2006 Sep 28;443(7110):439-43
17006511