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NO2 Retrieval from the Environmental Trace Gases Monitoring Instrument (EMI): Preliminary Results and Intercomparison with OMI and TROPOMI

Cheng, Liangxiao and Tao, Jinhua and Valks, Pieter and Yu, Chao and Liu, Song and Wang, Yapeng and Xiong, Xiaozhen and Wang, Zifeng and Chen, Liangfu (2019) NO2 Retrieval from the Environmental Trace Gases Monitoring Instrument (EMI): Preliminary Results and Intercomparison with OMI and TROPOMI. Remote Sensing, 11 (24), 3017_1-3017_18. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs11243017 ISSN 2072-4292

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Official URL: https://www.mdpi.com/2072-4292/11/24/3017

Abstract

Onboard the Chinese GaoFen-5 (GF5) satellite, the Environmental trace gases Monitoring Instrument (EMI) is a nadir-viewing wide-field spectrometer that was launched on May 9, 2018. EMI measures the back-scattered earthshine solar radiance in the ultraviolet and visible spectral range. By using the differential optical absorption spectrometry (DOAS) method and the EMI measurements in the VIS1 band (405–465 nm), we performed retrievals of NO2. Some first retrieval results of NO2 from EMI and a comparison with OMI and TROPOMI products are presented in this paper. The monthly mean total vertical column densities (VCD) of NO2 show similar spatial distributions to OMI and TROPOMI (r > 0.88) and their difference is less than 27%. A comparison of the daily total VCD shows that EMI could detect the NO2 patterns in good agreement with OMI (r = 0.93) and TROPOMI (r = 0.95). However, the slant column density (SCD) uncertainty (0.79 × 1015 molec cm−2) of the current EMI algorithm is relatively larger than OMI. The daily variation pattern of NO2 from EMI in Beijing in January 2019 is consistent with TROPOMI (r = 0.96). The spatial distribution correlation of the tropospheric NO2 VCD of EMI with OMI and TROPOMI is 0.88 and 0.89, respectively, but shows an overestimate compared to OMI (15%) and TROPOMI (23%), respectively. This study demonstrates the capability of using EMI for global NO2 monitoring.

Item URL in elib:https://elib.dlr.de/133020/
Document Type:Article
Title:NO2 Retrieval from the Environmental Trace Gases Monitoring Instrument (EMI): Preliminary Results and Intercomparison with OMI and TROPOMI
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cheng, Liangxiaochenglx (at) radi.ac.cnUNSPECIFIED
Tao, Jinhuataojh (at) radi.ac.cnUNSPECIFIED
Valks, PieterPieter.Valks (at) dlr.deUNSPECIFIED
Yu, Chaoyuchao (at) radi.ac.cnUNSPECIFIED
Liu, SongSong.Liu (at) dlr.deUNSPECIFIED
Wang, Yapengwangyp (at) radi.ac.cnUNSPECIFIED
Xiong, Xiaozhenxiaozhen.xiong (at) noaa.govUNSPECIFIED
Wang, Zifengwangzf (at) radi.ac.cnUNSPECIFIED
Chen, Liangfuchenlf (at) radi.ac.cnUNSPECIFIED
Date:14 December 2019
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.3390/rs11243017
Page Range:3017_1-3017_18
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:GaoFen 5; Environmental trace gases Monitoring Instrument; DOAS; stratosphere and troposphere NO2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Valks, Dr. Pieter
Deposited On:20 Dec 2019 17:26
Last Modified:20 Dec 2019 17:26

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