Climate Change Data Portal
DOI | 10.5194/amt-11-4943-2018 |
The first evaluation of formaldehyde column observations by improved Pandora spectrometers during the KORUS-AQ field study | |
Spinei, Elena1,2; Whitehill, Andrew3; Fried, Alan4; Tiefengraber, Martin5,6; Knepp, Travis N.7,8; Herndon, Scott9; Herman, Jay R.1,10; Mueller, Moritz5,6; Abuhassan, Nader1,10; Cede, Alexander1,5; Richter, Dirk4; Walega, James4; Crawford, James7; Szykman, James3,7; Valin, Lukas3; Williams, David J.3; Long, Russell3; Swap, Robert J.1; Lee, Youngjae11; Nowak, Nabil2; Poche, Brett2 | |
发表日期 | 2018-08-31 |
ISSN | 1867-1381 |
卷号 | 11期号:9页码:4943-4961 |
英文摘要 | The Korea-United States Air Quality Study (KORUS-AQ) conducted during May-June 2016 offered the first opportunity to evaluate direct-sun observations of formaldehyde (HCHO) total column densities with improved Pandora spectrometer instruments. The measurements highlighted in this work were conducted both in the Seoul megacity area at the Olympic Park site (37.5232 degrees N, 27.1260 degrees E; 26 m a.s.l.) and at a nearby rural site downwind of the city at the Mount Taehwa research forest site (37.3123 degrees N, 127.3106 degrees E; 160 m a.s.l.). Evaluation of these measurements was made possible by concurrent ground-based in situ observations of HCHO at both sites as well as overflight by the NASA DC-8 research aircraft. The flights provided in situ measurements of HCHO to characterize its vertical distribution in the lower troposphere (0-5 km). Diurnal variation in HCHO total column densities followed the same pattern at both sites, with the minimum daily values typically observed between 6:00 and 7:00 local time, gradually increasing to a maximum between 13:00 and 17:00 before decreasing into the evening. Pandora vertical column densities were compared with those derived from the DC-8 HCHO in situ measured profiles augmented with in situ surface concentrations below the lowest altitude of the DC-8 in proximity to the ground sites. A comparison between 49 column densities measured by Pandora vs. aircraft-integrated in situ data showed that Pandora values were larger by 16 % with a constant offset of 0.22 DU (Dobson units; R-2 = 0.68). Pandora HCHO columns were also compared with columns calculated from the surface in situ measurements over Olympic Park by assuming a well-mixed lower atmosphere up to a ceilometer-measured mixed-layer height (MLH) and various assumptions about the small residual HCHO amounts in the free troposphere up to the tropopause. The best comparison (slope = 1.03 +/- 0.03; intercept = 0.29 +/- 0.02 DU; and R-2 = 0.78 +/- 0.02) was achieved assuming equal mixing within ceilometer-measured MLH combined with an exponential profile shape. These results suggest that diurnal changes in HCHO surface concentrations can be reasonably estimated from the Pandora total column and information on the mixed-layer height. More work is needed to understand the bias in the intercept and the slope relative to columns derived from the in situ aircraft and surface measurements. |
语种 | 英语 |
WOS记录号 | WOS:000443280100001 |
来源期刊 | ATMOSPHERIC MEASUREMENT TECHNIQUES |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/61802 |
作者单位 | 1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 2.Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA; 3.US EPA, Res Triangle Pk, NC 27709 USA; 4.Univ Colorado, Inst Arct & Alpine Res INSTAAR, Boulder, CO 80303 USA; 5.LuftBlick, Kreith 39A, A-6162 Mutters, Austria; 6.Univ Innsbruck, Inst Atmospher & Cryospher Sci, Innsbruck, Austria; 7.NASA, Langley Res Ctr, Hampton, VA 23681 USA; 8.Sci Syst & Applicat Inc, Hampton, VA 23681 USA; 9.Aerodyne Res Inc, Billerica, MA 01821 USA; 10.Univ Maryland Baltimore Cty, Baltimore, MD USA; 11.Korean Natl Inst Environm Res NIER, Incheon, South Korea |
推荐引用方式 GB/T 7714 | Spinei, Elena,Whitehill, Andrew,Fried, Alan,et al. The first evaluation of formaldehyde column observations by improved Pandora spectrometers during the KORUS-AQ field study[J]. 美国环保署,2018,11(9):4943-4961. |
APA | Spinei, Elena.,Whitehill, Andrew.,Fried, Alan.,Tiefengraber, Martin.,Knepp, Travis N..,...&Poche, Brett.(2018).The first evaluation of formaldehyde column observations by improved Pandora spectrometers during the KORUS-AQ field study.ATMOSPHERIC MEASUREMENT TECHNIQUES,11(9),4943-4961. |
MLA | Spinei, Elena,et al."The first evaluation of formaldehyde column observations by improved Pandora spectrometers during the KORUS-AQ field study".ATMOSPHERIC MEASUREMENT TECHNIQUES 11.9(2018):4943-4961. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。