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Denitrification and associated nitrous oxide and carbon dioxide emissions from the Amazonian wetlands
Biogeosciences ( IF 4.9 ) Pub Date : 2020-08-28 , DOI: 10.5194/bg-17-4297-2020 Jérémy Guilhen , Ahmad Al Bitar , Sabine Sauvage , Marie Parrens , Jean-Michel Martinez , Gwenael Abril , Patricia Moreira-Turcq , José-Miguel Sánchez-Pérez
Biogeosciences ( IF 4.9 ) Pub Date : 2020-08-28 , DOI: 10.5194/bg-17-4297-2020 Jérémy Guilhen , Ahmad Al Bitar , Sabine Sauvage , Marie Parrens , Jean-Michel Martinez , Gwenael Abril , Patricia Moreira-Turcq , José-Miguel Sánchez-Pérez
In this paper, we quantify the CO2 and N2O emissions from denitrification over the Amazonian wetlands. The study concerns the entire Amazonian wetland ecosystem with a specific focus on three floodplain (FP) locations: the Branco FP, the Madeira FP and the FP alongside the Amazon River. We adapted a simple denitrification model to the case of tropical wetlands and forced it by open water surface extent products from the Soil Moisture and Ocean Salinity (SMOS) satellite. A priori model parameters were provided by in situ observations and gauging stations from the HYBAM Observatory. Our results show that the denitrification and the trace gas emissions present a strong cyclic pattern linked to the inundation processes that can be divided into three distinct phases: activation, stabilization and deactivation. We quantify the average yearly denitrification and associated emissions of CO2 and N2O over the entire watershed at 17.8 kgN ha−1 yr−1, 0.37 gC-CO2 m−2 yr−1 and 0.18 gN-N2O m−2 yr−1 respectively for the period 2011–2015. When compared to local observations, it was found that the CO2 emissions accounted for 0.01 % of the integrated ecosystem, which emphasizes the fact that minor changes to the land cover may induce strong impacts on the Amazonian carbon budget. Our results are consistent with the state of the art of global nitrogen models with a positive bias of 28 %. When compared to other wetlands in different pedoclimatic environments we found that the Amazonian wetlands have similar emissions of N2O with the Congo tropical wetlands and lower emissions than the temperate and tropical anthropogenic wetlands of the Garonne (France), the Rhine (Europe) and south-eastern Asia rice paddies. In summary our paper shows that a data-model-based approach can be successfully applied to quantify N2O and CO2 fluxes associated with denitrification over the Amazon basin. In the future, the use of higher-resolution remote sensing products from sensor fusion or new sensors like the Surface Water and Ocean Topography (SWOT) mission will permit the transposition of the approach to other large-scale watersheds in tropical environments.
中文翻译:
亚马逊湿地的反硝化作用以及相关的一氧化二氮和二氧化碳排放
在本文中,我们量化了CO 2和N 2 O亚马逊湿地反硝化产生的二氧化碳排放量。该研究涉及整个亚马逊湿地生态系统,特别关注三个洪泛区(FP)位置:Branco FP,Madeira FP和与Amazon River相邻的FP。我们针对热带湿地调整了简单的反硝化模型,并通过土壤水分和海洋盐分(SMOS)卫星的开放水面范围产品对其进行了强制。HYBAM天文台的现场观测和测量站提供了先验模型参数。我们的结果表明,反硝化作用和痕量气体排放呈现出与淹没过程相关的强循环模式,可将其分为三个不同的阶段:活化,稳定和失活。我们量化了每年的平均脱氮量和相关排放量CO 2和Ñ 2 ö超过分水岭在17.8 KGN公顷整个-1 年-1,0.37 GC- CO 2 米-2 年-1和0.18 GN- Ñ 2 ö 米-2 年-1分别期间2011- 2015年。与当地观察结果相比,发现CO 2排放量占综合生态系统的0.01%,这强调了以下事实:土地覆被的微小变化可能会对亚马逊的碳预算产生强烈影响。我们的结果与全球氮模型的最新技术水平一致,正偏差为28%。与不同气候环境下的其他湿地相比,我们发现亚马逊湿地的N 2 O排放量与刚果热带湿地相近,且排放量低于加龙河(法国),莱茵河(欧洲)和温带人为温带和热带人为湿地。东南亚稻田。总而言之,我们的论文表明,基于数据模型的方法可以成功地用于量化N 2 O和CO与亚马逊盆地反硝化作用相关的2种通量。将来,使用来自传感器融合的高分辨率遥感产品或诸如地表水和海洋地形(SWOT)任务之类的新传感器将允许将该方法转换为热带环境中的其他大型集水区。
更新日期:2020-08-28
中文翻译:
亚马逊湿地的反硝化作用以及相关的一氧化二氮和二氧化碳排放
在本文中,我们量化了CO 2和N 2 O亚马逊湿地反硝化产生的二氧化碳排放量。该研究涉及整个亚马逊湿地生态系统,特别关注三个洪泛区(FP)位置:Branco FP,Madeira FP和与Amazon River相邻的FP。我们针对热带湿地调整了简单的反硝化模型,并通过土壤水分和海洋盐分(SMOS)卫星的开放水面范围产品对其进行了强制。HYBAM天文台的现场观测和测量站提供了先验模型参数。我们的结果表明,反硝化作用和痕量气体排放呈现出与淹没过程相关的强循环模式,可将其分为三个不同的阶段:活化,稳定和失活。我们量化了每年的平均脱氮量和相关排放量CO 2和Ñ 2 ö超过分水岭在17.8 KGN公顷整个-1 年-1,0.37 GC- CO 2 米-2 年-1和0.18 GN- Ñ 2 ö 米-2 年-1分别期间2011- 2015年。与当地观察结果相比,发现CO 2排放量占综合生态系统的0.01%,这强调了以下事实:土地覆被的微小变化可能会对亚马逊的碳预算产生强烈影响。我们的结果与全球氮模型的最新技术水平一致,正偏差为28%。与不同气候环境下的其他湿地相比,我们发现亚马逊湿地的N 2 O排放量与刚果热带湿地相近,且排放量低于加龙河(法国),莱茵河(欧洲)和温带人为温带和热带人为湿地。东南亚稻田。总而言之,我们的论文表明,基于数据模型的方法可以成功地用于量化N 2 O和CO与亚马逊盆地反硝化作用相关的2种通量。将来,使用来自传感器融合的高分辨率遥感产品或诸如地表水和海洋地形(SWOT)任务之类的新传感器将允许将该方法转换为热带环境中的其他大型集水区。