Intercomparison of nitrous acid (HONO) measurement techniques in a megacity (Beijing)

被引:50
作者
Crilley, Leigh R. [1 ]
Kramer, Louisa J. [1 ]
Ouyang, Bin [2 ]
Duan, Jun [3 ]
Zhang, Wenqian [4 ]
Tong, Shengrui [4 ]
Ge, Maofa [4 ]
Tang, Ke [3 ]
Qin, Min [3 ]
Xe, Pinhua [3 ]
Shaw, Marvin [5 ,6 ]
Lewis, Alastair C. [5 ,6 ]
Mehra, Archit [7 ]
Bannan, Thomas J. [7 ]
Worrall, Stephen D. [7 ,9 ]
Priestley, Michael [7 ,10 ]
Bacak, Asan [7 ]
Coe, Hugh [7 ]
Allan, James [6 ,7 ]
Percival, Carl J. [7 ,11 ]
Popoola, Olalekan A. M. [8 ]
Jones, Roderic L. [8 ]
Bloss, William J. [1 ]
机构
[1] Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England
[2] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
[3] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Anhui, Peoples R China
[4] Chinese Acad Sci, Beijing Natl Lab Mol Sci, State Key Lab Struct Chem Unstable & Stable Speci, CAS Res Educ Ctr Excellence Mol Sci,Inst Chem, Beijing 100190, Peoples R China
[5] Univ York, Wolfson Atmospher Chem Labs, York YO10 5DD, N Yorkshire, England
[6] Natl Ctr Atmospher Sci, Leeds, W Yorkshire, England
[7] Univ Manchester, Ctr Atmospher Sci, Sch Earth & Environm Sci, Manchester M13 9PL, Lancs, England
[8] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
[9] Aston Univ, Sch Engn & Appl Sci, Chem Engn & Appl Chem, Birmingham B4 7ET, W Midlands, England
[10] Univ Gothenburg, Dept Chem & Mol Biol, Atmospher Sci, Gothenburg, Sweden
[11] Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
基金
英国自然环境研究理事会; 英国医学研究理事会;
关键词
IONIZATION MASS-SPECTROMETER; ENHANCED ABSORPTION SPECTROMETER; ANNULAR DENUDER; CROSS-SECTIONS; CENTRAL LONDON; NO2; SUMMER; URBAN; CIMS; N2O5;
D O I
10.5194/amt-12-6449-2019
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Nitrous acid (HONO) is a key determinant of the daytime radical budget in the daytime boundary layer, with quantitative measurement required to understand OH radical abundance. Accurate and precise measurements of HONO are therefore needed; however HONO is a challenging compound to measure in the field, in particular in a chemically complex and highly polluted environment. Here we report an intercomparison exercise between HONO measurements performed by two wet chemical techniques (the commercially available a long-path absorption photometer (LOPAP) and a custom-built instrument) and two broadband cavity-enhanced absorption spectrophotometer (BBCEAS) instruments at an urban location in Beijing. In addition, we report a comparison of HONO measurements performed by a time-of-flight chemical ionization mass spectrometer (ToF-CIMS) and a selected ion flow tube mass spectrometer (SIFT-MS) to the more established techniques (wet chemical and BBCEAS). The key finding from the current work was that all instruments agree on the temporal trends and variability in HONO (r(2) > 0.97), yet they displayed some divergence in absolute concentrations, with the wet chemical methods consistently higher overall than the BBCEAS systems by between 12% and 39 %. We found no evidence for any systematic bias in any of the instruments, with the exception of measurements near instrument detection limits. The causes of the divergence in absolute HONO concentrations were unclear, and may in part have been due to spatial variability, i.e. differences in instrument location and/or inlet position, but this observation may have been more associative than casual.
引用
收藏
页码:6449 / 6463
页数:15
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