An improved air mass factor calculation for nitrogen dioxide measurements from the Global Ozone Monitoring Experiment-2 (GOME-2)

被引：16

作者：

Liu, Song ^{[1
]}

Valks, Pieter ^{[1
]}

Pinardi, Gaia ^{[2
]}

Xu, Jian ^{[1
]}

Argyrouli, Athina ^{[1
,4
]}

Lutz, Ronny ^{[1
]}

Tilstra, L. Gijsbert ^{[3
]}

Huijnen, Vincent ^{[3
]}

Hendrick, Francois ^{[2
]}

Van Roozendael, Michel ^{[2
]}

机构：

[1] Deutsch Zentrum Luft & Raumfahrt DLR, IMF, Oberpfaffenhofen, Germany

[2] Royal Belgian Inst Space Aeron BIRA IASB, Brussels, Belgium

[3] Royal Netherlands Meteorol Inst KNMI, De Bilt, Netherlands

[4] Tech Univ Munich, Dept Civil Geo & Environm Engn, Chair Remote Sensing Technol, Munich, Germany

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2020年 / 13卷 / 02期

关键词：

MAX-DOAS OBSERVATIONS; SURFACE REFLECTANCE ANISOTROPY; TROPOSPHERIC NO2 RETRIEVAL; INTEGRATED FORECASTING SYSTEM; VERTICAL COLUMN DENSITIES; SATELLITE RETRIEVALS; CHEMISTRY TRANSPORT; RADIATIVE-TRANSFER; DATA ASSIMILATION; ATMOSPHERIC COMPOSITION;

D O I：

10.5194/amt-13-755-2020

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

An improved tropospheric nitrogen dioxide (NO2) retrieval algorithm from the Global Ozone Monitoring Experiment-2 (GOME-2) instrument based on air mass factor (AMF) calculations performed with more realistic model parameters is presented. The viewing angle dependency of surface albedo is taken into account by improving the GOME-2 Lambertian-equivalent reflectivity (LER) climatology with a directionally dependent LER (DLER) dataset over land and an ocean surface albedo parameterisation over water. A priori NO2 profiles with higher spatial and temporal resolutions are obtained from the IFS (CB05BASCOE) chemistry transport model based on recent emission inventories. A more realistic cloud treatment is provided by a clouds-as-layers (CAL) approach, which treats the clouds as uniform layers of water droplets, instead of the current cloudsas-reflecting-boundaries (CRB) model, which assumes that the clouds are Lambertian reflectors. On average, improvements in the AMF calculation affect the tropospheric NO2 columns by +/- 15% in winter and +/- 5% in summer over largely polluted regions. In addition, the impact of aerosols on our tropospheric NO2 retrieval is investigated by comparing the concurrent retrievals based on ground-based aerosol measurements (explicit aerosol correction) and the aerosol-induced cloud parameters (implicit aerosol correction). Compared with the implicit aerosol correction utilising the CRB cloud parameters, the use of the CAL approach reduces the AMF errors by more than 10 %. Finally, to evaluate the improved GOME-2 tropospheric NO2 columns, a validation is performed using ground-based multi-axis differential optical absorption spectroscopy (MAXDOAS) measurements at different BIRA-IASB stations. At the suburban Xianghe station, the improved tropospheric NO2 dataset shows better agreement with coincident ground-based measurements with a correlation coefficient of 0.94.

引用

页码：755 / 787

页数：33