Eddy covariance measurements of oxygenated volatile organic compound fluxes from crop harvesting using a redesigned proton-transfer-reaction mass spectrometer
Eddy covariance measurements of oxygenated volatile organic compound fluxes from crop harvesting using a redesigned proton-transfer-reaction mass spectrometer
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DOI：
10.1029/2000jd000112
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发表时间：
2001-10-27
影响因子：
4.4
通讯作者：
Lindinger, W
中科院分区：
文献类型：
--
作者：
Karl, T;Guenther, A;Lindinger, W
重新设计的质子转移反应质谱仪在野外部署，以测量干草切割和干燥后释放的挥发性有机化合物（VOCs）的大气通量。该仪器有一个快速的响应，大约0.1秒，允许使用涡流相关技术。测量是在奥地利蒂罗尔东部的一个干草田里进行的，时间为3天，是在生长季早期，并与生长季后期使用反应较慢的仪器获得的早期结果进行比较[Karl et al., 2000]。在收获期间和收获后，观察到甲醇的峰值上升通量为9.9 × 10(-6) g m(-2) s(-1)，乙醛的峰值上升通量为1.5 × 10(-6) g m(-2) s(-1)，己烯醇、己醛、戊醇、3-甲基丁醛和丁酮的总和为1.5 × 10(-6) g m(-2) s（-1）。第一天的时间积分值为甲醇的65 +/- 20 mg m(-2)（130 +/- 40杯每克干重（gdw）（-1））和乙醛的13 +/- 4 mg m(-2)（26 +/- 8杯gdw(-1)）。本研究测量的VOC通量普遍高于1999年8月，这可以解释为更高的温度和更高的光合生产力。与另一种估算VOC通量的方法，即表面梯度法，取得了很好的一致性。本文介绍了各种含氧VOCS的涡旋相关方差的测量结果，并表明干草收获可以在短期内影响阿尔卑斯山许多地区的当地空气质量。
A redesigned proton-transfer-reaction mass spectrometer was deployed in the field to measure atmospheric fluxes of volatile organic compounds (VOCs) released following the cutting and drying of hay. The instrument has a fast response, around 0.1 s, allowing use of the eddy covariance technique. Measurements were done over a 3-day period in a hay field in the eastern part of Tirol, Austria, in the early growing season and are compared to earlier results obtained using a slower-response instrument in the late growing season [Karl et al., 2000]. Peak upward fluxes of the order of 9.9 x 10(-6) g m(-2) s(-1) for methanol, 1.5 x 10(-6) g m(-2) S-1 for acetaldehyde, and 1.5 x 10(-6) g m(-2) s(-1) for the sum of hexenals, hexenols, hexanal, pentenols, 3-methylbutanal, and butanone were observed during and after harvesting. Time-integrated values for the first day were of the order of 65 +/- 20 mg m(-2) (130 +/- 40 mug per gram dry weight(gdw)(-1)) for methanol and 13 +/- 4 mg m(-2) (26 +/- 8 mug gdw(-1)) for acetaldehyde. VOC fluxes measured in this study were generally higher than in August 1999, which can be explained by higher temperatures and higher photosynthetic productivity. Good agreement with another means for estimating VOC fluxes, the surface gradient method, was achieved. This paper presents measurements of eddy covariance for a wide variety of oxygenated VOCS and shows that hay harvesting can influence the local air quality in many regions in the Alps on a short-term basis.