Technical note: Laboratory evaluation of a tunable diode laser system for eddy covariance measurements of ammonia flux

被引：20
|
作者：
Brodeur, J. J. [2 ]
Warland, J. S. [1 ]
Staebler, R. M. [3 ]
Wagner-Riddle, C. [1 ]
机构：
[1] Univ Guelph, Dept Land Resource Sci, Guelph, ON N1G 2W1, Canada
[2] McMaster Univ, Sch Geog & Earth Sci, Hamilton, ON L8S 4K1, Canada
[3] Environm Canada, Toronto, ON M3H 5T4, Canada
来源：
AGRICULTURAL AND FOREST METEOROLOGY | 2009年 / 149卷 / 02期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Ammonia; Trace gas analyzer; Eddy covariance; Tunable diode laser; Spectral response; EXCHANGE; VOLATILIZATION; ATMOSPHERE; FLOW; NH3;
D O I：
10.1016/j.agrformet.2008.08.009
中图分类号：
S3 [农学（农艺学）];
学科分类号：
0901 ;
摘要：
A tunable diode laser trace gas analyzer (TGA 100, Campbell Scientific, Logan, Utah) was evaluated in the laboratory for its ability to measure ammonia fluxes using the eddy covariance technique. A random noise generator was used in the laboratory to switch sampling between high and low concentration air streams to simulate a range of eddy sizes with a known input. A mechanical switching system was developed to prevent pressure fluctuations during switching associated with valves. A half-power point of 0.4 Hz was found for 50 m of sampling tubing. Resolution, determined through laboratory tests, was conservatively estimated between 0.2 and 1 mu g m(-2) s(-1). (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：385 / 391
页数：7
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