气候变化领域集成服务门户(CCPortal): Tracking the atmospheric pulse of a North American megacity from a mountaintop remote sensing observatory

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DOI	10.1016/j.rse.2020.112000
	Tracking the atmospheric pulse of a North American megacity from a mountaintop remote sensing observatory
	Zeng Z.-C.; Wang Y.; Pongetti T.J.; Gong F.-Y.; Newman S.; Li Y.; Natraj V.; Shia R.-L.; Yung Y.L.; Sander S.P.
发表日期	2020
ISSN	00344257
卷号	248
英文摘要	Atmospheric carbon monoxide (CO) is an effective tracer for monitoring atmospheric transport processes and for detecting pollution sources of anthropogenic origin. However, very few observation systems exist that are capable of providing measurements with high spatial and temporal resolution to identify hotspots for emission control purposes. Here we introduce a mountain-top remote sensing observatory, the California Laboratory for Atmospheric Remote Sensing (CLARS), for mapping the enhancement of CO column-averaged mixing ratio (XCO) over the Los Angeles (LA) megacity. Compared to conventional observation network, CLARS is unique in the following ways: (1) it mimics a geostationary satellite observatory for LA with approximately hourly- and kilometer-scale mapping capability; (2) the free tropospheric background atmosphere is simultaneously measured; and (3) the measurements are highly sensitive to anthropogenic emissions due to the long light path along the planetary boundary layer (PBL). The CO slant column density and XCO are retrieved from reflected sunlight measurements in the 2.3 μm CO band and the 1.27 μm oxygen (O2) band. Data filtering and corrections for aerosol scattering and geometric effects are then implemented to derive the XCO enhancement, which is the XCO excess in the PBL compared to the background value. In the LA megacity, the XCO enhancement shows a distinctive diurnal cycle primarily driven by changes in anthropogenic emissions and sea-breeze circulation. Such diurnal patterns can be reproduced by the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem). The enhancement also shows a significant weekly cycle resulting from the weekly pattern in anthropogenic CO emissions. On average, the XCO enhancements on Sunday and Saturday are 16.1% and 4.4%, respectively, lower than weekday values. The weekly XCO enhancement patterns also show high correlation with traffic counts. A seasonal pattern of XCO enhancement with high (low) spatial contrast in summer (winter), resulting from changing sea-breeze circulation, can be observed. These diurnal, weekly, and seasonal patterns of XCO enhancement serve as tracers of the atmospheric pulse of the LA megacity. The CLARS observatory can serve as a testbed for future geostationary missions to track anthropogenic emissions in cities. © 2020 Elsevier Inc.
英文关键词	Atmospheric pulse; Carbon monoxide; CLARS; Los Angeles; Remote sensing
语种	英语
scopus关键词	Atmospheric chemistry; Boundary layers; Carbon monoxide; Emission control; Geostationary satellites; Mapping; Observatories; Tracers; Weather forecasting; Anthropogenic emissions; Atmospheric carbon monoxide; Atmospheric remote sensing; Planetary boundary layers; Sea breeze circulation; Slant column densities; Spatial and temporal resolutions; Weather research and forecasting models; Remote sensing; aerosol; Anthropocene; atmospheric transport; carbon monoxide; correlation; geostationary satellite; human activity; megacity; mixing ratio; observatory; remote sensing; satellite data; California; Los Angeles [California]; United States
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179192
作者单位	Joint Institute for Regional Earth System Science & Engineering (JIFRESSE), University of California, Los Angeles, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States; Bay Area Air Quality Management District, San Francisco, United States; University of Southern California, Los Angeles, United States
推荐引用方式 GB/T 7714	Zeng Z.-C.,Wang Y.,Pongetti T.J.,et al. Tracking the atmospheric pulse of a North American megacity from a mountaintop remote sensing observatory[J],2020,248.
APA	Zeng Z.-C..,Wang Y..,Pongetti T.J..,Gong F.-Y..,Newman S..,...&Sander S.P..(2020).Tracking the atmospheric pulse of a North American megacity from a mountaintop remote sensing observatory.Remote Sensing of Environment,248.
MLA	Zeng Z.-C.,et al."Tracking the atmospheric pulse of a North American megacity from a mountaintop remote sensing observatory".Remote Sensing of Environment 248(2020).