Abstract Nitrous oxide is one of the atmospheric greenhouse gases whose amount is significantly influenced by human activity. Its major anthropogenic sources are the agricultural soils but the emission is known only with large uncertainty yet. The paper presents a tall tower based measuring system installed in Hungary, which is designed for the long-term monitoring of nitrous oxide emission of a regionally typical composition of agricultural fields by means of eddy covariance technique. Due to the careful calibration of the gas analyzer applied the measuring system is also suitable for the recording of the atmospheric concentration of nitrous oxide on the globally compatible scale (WMO X2006A). The paper reports the results of the first two years of the monitoring program, which is the first of its kind in Central Europe. For the period of July 2015–June 2017 the concentration measurements indicate an increasing trend of 0.91 nmol mol−1 year−1 with an average concentration of 330.64 nmol mol−1. During the two years of the project, the monitoring system recorded a total of 441 ± 195 mg N2O-N m−2 nitrous oxide emission with late spring/early summer maximum. The measurements also revealed the episodic nature of the emission typically triggered by major precipitation events.

中文翻译：

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基于高塔的中欧农业区一氧化二氮通量监测的初步结果

摘要 一氧化二氮是大气温室气体之一，其数量受人类活动影响显着。其主要的人为来源是农业土壤，但其排放量尚有很大的不确定性。本文介绍了一种安装在匈牙利的高塔式测量系统，该系统旨在通过涡流协方差技术对区域典型农田组成的一氧化二氮排放进行长期监测。由于对所应用的气体分析仪进行了仔细校准，因此该测量系统也适用于以全球兼容的尺度 (WMO X2006A) 记录大气中的一氧化二氮浓度。该文件报告了前两年监测计划的结果，这在中欧尚属首次。在 2015 年 7 月至 2017 年 6 月期间，浓度测量表明增加趋势为 0.91 nmol mol-1 年-1，平均浓度为 330.64 nmol mol-1。在项目的两年中，监测系统共记录了 441 ± 195 mg N2O-N m-2 一氧化二氮排放，其中春末/夏初最大。测量结果还揭示了通常由主要降水事件引发的排放的偶发性。