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Factors controlling the variability and emissions of greenhouse gases (CO2, CH4 and N2O) in three estuaries of the Southern Iberian Atlantic Basin during July 2017
Marine Chemistry ( IF 3 ) Pub Date : 2020-08-06 , DOI: 10.1016/j.marchem.2020.103867
A. Sierra , D. Jiménez-López , T. Ortega , A. Gómez-Parra , J. Forja

The partial pressure of CO2 (pCO2) and concentration of dissolved CH4 and N2O were studied during July 2017 in three estuaries of the southern Iberian Atlantic basin: the Guadalquivir, Tinto - Odiel and Guadiana. Two different sampling methods were adopted for each estuary: a longitudinal sampling along the course of the river, and a tidal cycle sampling of 24 h in the mouth of the estuary. In general, there is an increase in the concentration of gases towards the inner part of the river, in all three systems. Daily variations coupled to the tidal cycles were also observed in the three estuaries. The highest concentrations were measured during ebb, which suggests that the estuaries export CO2, CH4 and N2O to the Gulf of Cádiz. These three gases showed the highest value and range of variation in the Guadalquivir (pCO2: 959 ± 1009 μatm, CH4: 54.1 ± 74.5 nM, N2O: 14.1 ± 16.1 nM), followed by the Guadiana (pCO2: 595 ± 155 μatm, CH4: 53.5 ± 62.9 nM, N2O: 7.1 ± 0.5 nM), and the Tinto - Odiel (pCO2: 581 ± 204 μatm, CH4: 39.6 ± 43.5 nM, N2O: 6.8 ± 0.3 nM). Changes in pCO2 values and CH4 and N2O concentrations were affected by several factors: temperature, salinity, exchange with the atmosphere, reactivity of the gases and various physical and biological processes taking place in the estuaries object of study. The water - atmosphere fluxes of pCO2, CH4 and N2O resulted positive, revealing that the study area acts as a source of these gases to the atmosphere.



中文翻译:

2017年7月,控制伊比利亚南部大西洋盆地三个河口温室气体(CO 2,CH 4和N 2 O)的变异性和排放的因素

2017年7月,在伊比利亚南部大西洋盆地的三个河口(瓜达尔基维尔河,丁托-奥迪尔和瓜迪亚纳)研究了CO 2的分压(pCO 2)和溶解的CH 4和N 2 O的浓度。每个河口采用两种不同的采样方法:沿河道进行纵向采样,以及在河口处进行24小时的潮汐采样。通常,在所有三个系统中,流向河流内部的气体浓度都有所增加。在三个河口​​也观察到了与潮汐周期相关的日变化。在退潮期间测得最高浓度,这表明河口出口CO 2,CH4和N 2 O到达加的斯湾。这三种气体在瓜达尔基韦尔(pCO 2:959±1009μatm,CH 4:54.1±74.5 nM,N 2 O:14.1±16.1 nM)中显示最高值和变化范围,其次是瓜迪亚纳(pCO 2:595) ±155μatm,CH 4:53.5±62.9 nM,N 2 O:7.1±0.5 nM)和Tinto-Odiel(pCO 2:581±204μatm,CH 4:39.6±43.5 nM,N 2 O:6.8± 0.3 nM)。pCO 2值以及CH 4和N 2的变化O的浓度受几个因素影响:温度,盐度,与大气的交换,气体的反应性以及在河口研究对象中发生的各种物理和生物过程。pCO 2,CH 4和N 2 O的水-大气通量为正,表明研究区域是这些气体向大气的来源。

更新日期:2020-08-06
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