A Single Compartment Relaxed Eddy Accumulation Method

IF 3.8 2区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of Geophysical Research: Atmospheres Pub Date : 2024-10-08 DOI:10.1029/2024JD040811

T. Banerjee, G. G. Katul, E. Zahn, N. L. Dias, E. Bou-Zeid

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Abstract

The relaxed eddy accumulation (REA) method is a widely-known technique that measures turbulent fluxes of scalar quantities. The REA technique has been used to measure turbulent fluxes of various compounds, such as methane, ethene, propene, butene, isoprene, nitrous oxides, ozone, and others. The REA method requires the accumulation of scalar concentrations in two separate compartments that conditionally sample updrafts and downdraft events. It is demonstrated here that the assumptions behind the conventional or two-compartment REA approach allow for one-compartment sampling, therefore called a one compartment or 1-C-REA approach, thereby expanding its operational utility. The one-compartment sampling method is tested across various land cover types and atmospheric stability conditions, and it is found that the one-compartment REA can provide results comparable to those determined from conventional two-compartment REA. This finding enables rapid expansion and practical utility of REA in studies of surface-atmosphere exchanges, interactions, and feedbacks.

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单室松弛涡积法

松弛涡积（REA）法是一种广为人知的测量标量湍流通量的技术。REA 技术已被用于测量各种化合物的湍流通量，如甲烷、乙烯、丙烯、丁烯、异戊二烯、氧化亚氮、臭氧等。REA 方法要求在有条件采样上升气流和下降气流事件的两个独立区域中积累标量浓度。本文证明，传统或两室 REA 方法背后的假设允许进行一室采样，因此称为一室或 1-C-REA 方法，从而扩大了其操作实用性。在各种土地覆被类型和大气稳定性条件下对一室取样法进行了测试，结果发现一室 REA 可以提供与传统两室 REA 相媲美的结果。这一发现使 REA 能够在地表-大气交换、相互作用和反馈研究中迅速推广并发挥实际效用。

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来源期刊

Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics

CiteScore

7.30

自引率

11.40%

发文量

684

期刊介绍： JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.