River Winds and Transport of Forest Volatiles in the Amazonian Riparian Ecoregion
River Winds and Transport of Forest Volatiles in the Amazonian Riparian Ecoregion
复制标题
亚马逊河岸生态区的河风和森林挥发物的输送
DOI：
10.1021/acs.est.1c08460
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发表时间：
2022
影响因子：
11.4
通讯作者：
Vilà-Guerau de Arellano, Jordi
中科院分区：
文献类型：
--
作者：
Ye, Jianhuai;Batista, Carla E.;Zhao, Tianning;Campos, Jesus;Ma, Yongjing;Guimarães, Patricia;Ribeiro, Igor O.;Medeiros, Adan S.;Stewart, Matthew P.;Vilà-Guerau de Arellano, Jordi
森林排放的挥发性有机化合物(VOCs)是影响生态系统功能、大气化学和区域气候的重要化学成分。森林和邻近河流之间的温差可能会引起风，从而影响VOC的去向和运输。然而，定量观察和科学理解仍然缺乏。在这里，白天的VOC数据集是从亚马逊地区“里奥内格罗河”上500米深的海面上收集的。在河风期间，异戊二烯、α-Pinene和β-Pinene浓度在河流上空分别增加了50%、60%和80%。由于河流风的输送路径，500m处的浓度比100m处高出80%。相比之下，VOC氧化产物甲基丙烯醛的浓度并不取决于河风或高度。对于初级排放和氧化产物的不同观察结果可以通过排放、反应和传输之间的时间尺度的耦合来解释。这一行为是在耦合化学模型的大涡模拟中捕捉到的。观测和模拟的河流风在挥发性有机化合物去向和输送中的作用突出表明，需要在空气质量和化学-气候耦合的区域模式中更好地代表这些过程。©2022美国化学学会。
Volatile organic compounds (VOCs) emitted from forests are important chemical components that affect ecosystem functioning, atmospheric chemistry, and regional climate. Temperature differences between a forest and an adjacent river can induce winds that influence VOC fate and transport. Quantitative observations and scientific understanding, however, remain lacking. Herein, daytime VOC datasets were collected from the surface up to 500 m over the "Rio Negro"river in Amazonia. During time periods of river winds, isoprene, α-pinene, and β-pinene concentrations increased by 50, 60, and 80% over the river, respectively. The concentrations at 500 m were up to 80% greater compared to those at 100 m because of the transport path of river winds. By comparison, the concentration of methacrolein, a VOC oxidation product, did not depend on river winds or height. The differing observations for primary emissions and oxidation products can be explained by the coupling of timescales among emission, reaction, and transport. This behavior was captured in large-eddy simulations with a coupled chemistry model. The observed and simulated roles of river winds in VOC fate and transport highlight the need for improved representation of these processes in regional models of air quality and chemistry-climate coupling. © 2022 American Chemical Society.