气候变化领域集成服务门户(CCPortal): Tropospheric carbon monoxide over the northern Indian Ocean during winter: influence of inter-continental transport

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DOI	10.1007/s00382-020-05269-4
	Tropospheric carbon monoxide over the northern Indian Ocean during winter: influence of inter-continental transport
	Girach I.A.; Nair P.R.; Ojha N.; Sahu L.K.
发表日期	2020
ISSN	0930-7575
起始页码	5049
结束页码	5064
卷号	54
英文摘要	South Asian outflow over the adjoining marine regions is most pronounced during winter season, whereas the prevalence of strong winds aloft can transport the influences from inter-continental sources. Here, we investigate the tropospheric carbon monoxide (CO) distribution over the northern Indian Ocean (IO) combining shipborne measurements carried out during the Integrated Campaign for Aerosols, gases, and Radiation Budget (ICARB) campaign (January–February 2018), retrievals from Measurements of Pollution in the Troposphere (MOPITT), and Copernicus Atmosphere Monitoring Service (CAMS) model. Surface CO varied from ~ 50 to 365 ppbv (179 ± 67 ppbv) with higher levels over the coastal region of southeast Arabian Sea and lower levels over the equatorial IO. We observed lower CO levels (200 ± 43 ppbv) than those during the Indian Ocean Experiment-1999 (229 ± 40 ppbv) supporting the reported decreasing trend of tropospheric CO. In situ CO observations are found to be in a good agreement with the satellite retrievals (MOPITT-version 8) as well as the CAMS model results (r2 = 0.60‒0.65). The upper-tropospheric CO (300‒200 hPa) over the equatorial IO is observed to be higher by up to 30% during February-2018 as compared to the decadal mean, coinciding with anomalous westerlies resulting from a disturbed Walker cell over the equatorial IO and deeper penetration of the sub-tropical jet. The influences of African forest fires are suggested to have enhanced the upper-tropospheric CO over the IO during February-2018. Our study highlights the importance of strong large-scale dynamics and global biomass-burning emissions in the wintertime pollution loading over the IO, besides the South Asian outflow. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Biomass burning; Long-range transport; Sub-tropical jet; Trace gases; Walker cell
语种	英语
scopus关键词	aerosol composition; aerosol formation; carbon monoxide; outflow; satellite data; satellite imagery; troposphere; winter; Arabian Sea; Indian Ocean
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145445
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India; Former scientist at Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695022, India; Space and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad, 380009, India
推荐引用方式 GB/T 7714	Girach I.A.,Nair P.R.,Ojha N.,et al. Tropospheric carbon monoxide over the northern Indian Ocean during winter: influence of inter-continental transport[J],2020,54.
APA	Girach I.A.,Nair P.R.,Ojha N.,&Sahu L.K..(2020).Tropospheric carbon monoxide over the northern Indian Ocean during winter: influence of inter-continental transport.Climate Dynamics,54.
MLA	Girach I.A.,et al."Tropospheric carbon monoxide over the northern Indian Ocean during winter: influence of inter-continental transport".Climate Dynamics 54(2020).