Field inter-comparison of eleven atmospheric ammonia measurement techniques
Field inter-comparison of eleven atmospheric ammonia measurement techniques
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DOI：
10.5194/amt-3-91-2010
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发表时间：
2010-01-01
影响因子：
3.8
通讯作者：
Nemitz, E.
中科院分区：
文献类型：
--
作者：
von Bobrutzki, K.;Braban, C. F.;Nemitz, E.
2008年夏末，在苏格兰南部一块密集管理的农田上空，对基于8种不同测量方法的11台大气氨气(NH3)环境浓度测量仪器进行了相互比较。为了在大范围的浓度范围内测试仪器，在实验过程中对田地进行了尿素施肥，导致平均浓度从10ppbv增加到100ppbv。部署的仪器包括三个湿化学系统，一个是离线分析(环形旋转间歇剥离器，RBD)，两个在线分析(带在线分析的环形丹纳取样器，AiRRmonia)，两个量子级联激光吸收光谱仪(一个大细胞双系统，双QCLAS，一个紧凑系统；c-QCLAS)，两个光声光谱仪(WaSul-Flux；Nitrolux-100)，一个腔环下降光谱仪(CRDS)，一台化学电离质谱仪(CIMS)，一台离子迁移谱仪(IMS)和一台OpenPath傅里叶变换红外光谱仪(OP-FTIR)。将这些仪器相互比较，并与所有仪器的平均浓度进行比较。两台仪器(R-2和GT；0.84)之间的每小时平均浓度总体上是一致的，NH3浓度在高达120 ppbv的场地上的斜率为0.67(Dual-QCLAS)至1.13(AiRRmonia)，截距为-0.74 ppbv(RBD)至+2.69 ppbv(CIMS)。在较低浓度下，性能的可变性更大(
Eleven instruments for the measurement of ambient concentrations of atmospheric ammonia gas (NH3), based on eight different measurement methods were inter-compared above an intensively managed agricultural field in late summer 2008 in Southern Scotland. To test the instruments over a wide range of concentrations, the field was fertilised with urea midway through the experiment, leading to an increase in the average concentration from 10 to 100 ppbv. The instruments deployed included three wet-chemistry systems, one with offline analysis (annular rotating batch denuder, RBD) and two with online-analysis (Annular Denuder sampling with online Analysis, AMANDA; AiRRmonia), two Quantum Cascade Laser Absorption Spectrometers (a large-cell dual system; DUAL-QCLAS, and a compact system; c-QCLAS), two photo-acoustic spectrometers (WaSul-Flux; Nitrolux-100), a Cavity Ring Down Spectrosmeter (CRDS), a Chemical Ionisation Mass Spectrometer (CIMS), an ion mobility spectrometer (IMS) and an OpenPath Fourier Transform Infra-Red (OP-FTIR) Spectrometer. The instruments were compared with each other and with the average concentration of all instruments. An overall good agreement of hourly average concentrations between the instruments (R-2>0.84), was observed for NH3 concentrations at the field of up to 120 ppbv with the slopes against the average ranging from 0.67 (DUAL-QCLAS) to 1.13 (AiRRmonia) with intercepts of -0.74 ppbv (RBD) to + 2.69 ppbv (CIMS). More variability was found for performance for lower concentrations(