气候变化领域集成服务门户(CCPortal): Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport

CCPortal

DOI	10.5194/acp-20-3373-2020
	Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport
	Itahashi S.; Mathur R.; Hogrefe C.; Zhang Y.
发表日期	2020
ISSN	1680-7316
起始页码	3373
结束页码	3396
卷号	20 期号:6
英文摘要	Stratospheric intrusion and trans-Pacific transport have been recognized as a potential source of tropospheric ozone over the US. The state-of-the-science Community Multiscale Air Quality (CMAQ) modeling system has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ). In this study, H-CMAQ is applied to study the stratospheric intrusion and trans-Pacific transport during April 2010. The results will be presented in two companion papers. In this Part 1 paper, model evaluation for tropospheric ozone (O3) is presented. Observations at the surface, by ozonesondes and airplane, and by satellite across the Northern Hemisphere are used to evaluate the model performance for O3. H-CMAQ is able to capture surface and boundary layer (defined as surface to 750 hPa) O3 with a normalized mean bias (NMB) of -10 %; however, a systematic underestimation with an NMB up to -30 % is found in the free troposphere (defined as 750-250 hPa). In addition, a new air mass characterization method is developed to distinguish influences of stratosphere-troposphere transport (STT) from the effects of photochemistry on O3 levels. This method is developed based on the ratio of O3 and an inert tracer indicating stratospheric O3 to examine the importance of photochemistry, and sequential intrusion from upper layer. During April 2010, on a monthly average basis, the relationship between surface O3 mixing ratios and estimated stratospheric air masses in the troposphere show a slight negative slope, indicating that high surface O3 values are primarily affected by other factors (i.e., emissions), whereas this relationship shows a slight positive slope at elevated sites, indicating that STT has a possible impact at elevated sites. STT shows large day-to-day variations, and STT impacts can either originate from the same air mass over the entire US with an eastward movement found during early April, or stem from different air masses at different locations indicated during late April. Based on this newly established air mass characterization technique, this study can contribute to understanding the role of STT and also the implied importance of emissions leading to high surface O3. Further research focused on emissions is discussed in a subsequent paper (Part 2).. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	air mass; air quality; atmospheric chemistry; atmospheric modeling; atmospheric transport; boundary layer; Northern Hemisphere; ozone; stratosphere-troposphere interaction; United States
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141464
作者单位	Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 1646 Abiko, Abiko, Chiba, 270-1194, Japan; Environmental Protection Agency (EPA), Computational Exposure Division, National Exposure Research Laboratory_aor4 Office of Research and Development, Research Triangle Park, NC 27711, United States; Department of Marine Earth, and Atmospheric Sciences (MEAS), North Carolina State University (NCSU), Campus Box 8208, Raleigh, NC 27695, United States; Now At: Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, United States
推荐引用方式 GB/T 7714	Itahashi S.,Mathur R.,Hogrefe C.,et al. Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport[J],2020,20(6).
APA	Itahashi S.,Mathur R.,Hogrefe C.,&Zhang Y..(2020).Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport.Atmospheric Chemistry and Physics,20(6).
MLA	Itahashi S.,et al."Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport".Atmospheric Chemistry and Physics 20.6(2020).