Ozone production in transpacific Asian pollution plumes and implications for ozone air quality in California-猫眼课题宝

DOI：

10.1029/2004jd004974

发表时间：

2004-12

期刊：

Journal of Geophysical Research: Atmospheres

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

R. Hudman;D. Jacob;O. Cooper;M. J. Evans;C. Heald;R. Park;F. Fehsenfeld;F. Flocke;J. Holloway;G. Hübler;K. Kita;M. Koike;Y. Kondo;A. Neuman;Jonathan Nowak;S. Oltmans;D. Parrish;J. Roberts;T. Ryerson

[1]我们研究了跨太平洋亚洲污染羽流的臭氧生产效率，臭氧空气质量的影响，在加州，通过使用飞机和地面观测2002年4月至5月从洲际运输和化学转化2002年（ITCT 2K 2）运动关闭加州海岸和太平洋探索亚洲大陆排放-B（PEACE-B）运动在西北太平洋。用全球三维化学输运模式（GEOS-CHEM）对观测结果进行了解释。该模型再现了CO，活性氮氧化物（NOy）和臭氧观察到的平均功能，但低估了强大的（20 ppbv）平流层中对流层臭氧的贡献。ITCT 2K 2飞机对两个主要的跨太平洋亚洲污染羽流进行了采样，一个是5月5日在5-8公里高度进行的，CO高达275 ppbv，但没有臭氧升高，另一个是5月17日在2.5-4公里高度进行的，CO高达225 ppbv，臭氧高达90 ppbv。我们发现，在后者羽的臭氧升高是一致的生产过氧乙酰硝酸盐（PAN）分解过程中沉降的羽在东北太平洋。由于沉降环境的强辐射和低湿度，这种生产特别有效。我们认为，这样的PAN分解代表了跨太平洋亚洲污染羽流的臭氧增强的一个主要和可能的主导组成部分。亚洲污染羽流在美国边界层夹带期间发生强烈稀释，大大降低了它们对美国地面站点的影响。加州山区由于暴露在自由对流层中，对亚洲污染更为敏感。模型结果表明，在红杉国家公园在2002年5月的那些天，8小时平均臭氧浓度超过80 ppbv的平均亚洲污染增强7 ppbv的臭氧。索引术语：0368大气成分和结构：对流层成分输送和化学; 0365大气成分和结构：对流层成分和化学; 0345大气成分和结构：城市和区域污染（0305）;关键词：臭氧、亚洲污染、ITCT 2K 2、PEACE-B、跨太平洋输送

[1] We examine the ozone production efficiency in transpacific Asian pollution plumes, and the implications for ozone air quality in California, by using aircraft and surface observations in April–May 2002 from the Intercontinental Transport and Chemical Transformation 2002 (ITCT 2K2) campaign off the California coast and the Pacific Exploration of Asian Continental Emission–B (PEACE-B) campaign over the northwest Pacific. The observations are interpreted with a global three-dimensional chemical transport model (GEOS-CHEM). The model reproduces the mean features observed for CO, reactive nitrogen oxides (NOy), and ozone but underestimates the strong (20 ppbv) stratospheric contribution to ozone in the middle troposphere. The ITCT 2K2 aircraft sampled two major transpacific Asian pollution plumes, one on 5 May at 5–8 km altitude with CO up to 275 ppbv but no elevated ozone and one on 17 May at 2.5–4 km altitude with CO up to 225 ppbv and ozone up to 90 ppbv. We show that the elevated ozone in the latter plume is consistent with production from peroxyacetylnitrate (PAN) decomposition during subsidence of the plume over the northeast Pacific. This production is particularly efficient because of the strong radiation and low humidity of the subsiding environment. We argue that such PAN decomposition represents a major and possibly dominant component of the ozone enhancement in transpacific Asian pollution plumes. Strong dilution of Asian pollution plumes takes place during entrainment in the U.S. boundary layer, greatly reducing their impact at U.S. surface sites. California mountain sites are more sensitive to Asian pollution because of their exposure to the free troposphere. Model results indicate a mean Asian pollution enhancement of 7 ppbv ozone at Sequoia National Park in May 2002 on those days when the 8-hour average ozone concentration exceeded 80 ppbv. INDEX TERMS: 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 0345 Atmospheric Composition and Structure: Pollution—urban and regional (0305); KEYWORDS: ozone, Asian pollution, ITCT 2K2, PEACE-B, transpacific transport

Ozone production in transpacific Asian pollution plumes and implications for ozone air quality in California

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