A5069742147- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Radiative Heat Transfer Studies
- Traffic Prediction and Management Techniques
- Optical Imaging and Spectroscopy Techniques
- Chemistry and Chemical Engineering
- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Oil, Gas, and Environmental Issues
- Geochemistry and Geologic Mapping
- GNSS positioning and interference
- Air Quality and Health Impacts
- Effects and risks of endocrine disrupting chemicals
- Water Quality Monitoring and Analysis
- Environmental and Agricultural Sciences
- Per- and polyfluoroalkyl substances research
- Toxic Organic Pollutants Impact
- Digital Radiography and Breast Imaging
- Vehicle emissions and performance
Royal Belgian Institute for Space Aeronomy
2014-2024
Shaanxi Xueqian Normal University
2024
Qingdao University
2023
Guizhou Magic Pharmaceutical (China)
2023
Nello Carrara Institute of Applied Physics
2020
Finnish Meteorological Institute
2020
European Centre for Medium-Range Weather Forecasts
2020
University College London
2018
Abstract Spaceborne NO 2 column observations from two high‐resolution instruments, Tropospheric Monitoring Instrument (TROPOMI) on board Sentinel‐5 Precursor and Ozone (OMI) Aura, reveal unprecedented decreases over China, South Korea, western Europe, the United States as a result of public health measures enforced to contain coronavirus disease outbreak (Covid‐19) in January–April 2020. The average drop all Chinese cities amounts −40% relative same period 2019 reaches up factor ~2 at...
Abstract. On board the Copernicus Sentinel-5 Precursor (S5P) platform, TROPOspheric Monitoring Instrument (TROPOMI) is a double-channel, nadir-viewing grating spectrometer measuring solar back-scattered earthshine radiances in ultraviolet, visible, near-infrared, and shortwave infrared with global daily coverage. In ultraviolet range, its spectral resolution radiometric performance are equivalent to those of predecessor OMI, but horizontal at true nadir improved by an order magnitude. This...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (S-5P) platform will measure ultraviolet earthshine radiances at high spectral and improved spatial resolution (pixel size of 7 km × 3.5 nadir) compared to its predecessors OMI GOME-2. This paper presents sulfur dioxide (SO2) vertical column retrieval algorithm implemented in S-5P operational processor UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) comprehensively describes...
Abstract. Air mass factor (AMF) calculation is the largest source of uncertainty in NO2 and HCHO satellite retrievals situations with enhanced trace gas concentrations lower troposphere. Structural arises when different retrieval methodologies are applied within scientific community to same observations. Here, we address issue AMF structural via a detailed comparison methods that structurally between seven groups for measurements from Ozone Monitoring Instrument (OMI). We estimate escalation...
Abstract Over the last four decades, space-based nadir observations of sulfur dioxide (SO 2 ) proved to be a key data source for assessing environmental impacts volcanic emissions, monitoring activity and early signs eruptions, ultimately mitigating related hazards on local populations aviation. Despite its importance, detailed picture global SO daily degassing is difficult produce, notably lower-tropospheric plumes, due largely limited spatial resolution coverage or lack sensitivity...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI), launched in October 2017 on board the Sentinel-5 Precursor (S5P) satellite, monitors composition of Earth's atmosphere at an unprecedented horizontal resolution as fine 3.5 × 5.5 km2. This paper assesses performances TROPOMI formaldehyde (HCHO) operational product compared to its predecessor, OMI (Ozone Instrument) HCHO QA4ECV product, different spatial and temporal scales. parallel development two algorithms favoured consistency...
Abstract We present a new data set of sulfur dioxide (SO 2 ) vertical columns from observations the Ozone Monitoring Instrument (OMI)/AURA instrument between 2004 and 2013. The retrieval algorithm used is an advanced Differential Optical Absorption Spectroscopy (DOAS) scheme combined with radiative transfer calculation. It developed in preparation for operational processing SO product upcoming TROPOspheric Instrument/Sentinel 5 Precursor mission. evaluate column results those inferred other...
Abstract. Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements of sulfur dioxide (SO2) have been performed at the Xianghe station (39.8° N, 117.0° E) located ~ 50 km southeast Beijing from March 2010 to February 2013. Tropospheric SO2 vertical profiles and corresponding column densities (VCDs), retrieved by applying optimal estimation method MAX-DOAS observations, used study seasonal diurnal cycles SO2, in combination with correlative situ instruments,...
Abstract. The angular distribution of the light reflected by Earth's surface influences top-of-atmosphere (TOA) reflectance values. This anisotropy has implications for UV/Vis satellite retrievals albedo, clouds, and trace gases such as nitrogen dioxide (NO2). These routinely assume to reflect isotropically. Here we show that cloud fractions retrieved from GOME-2A OMI with FRESCO OMCLDO2 algorithms have an east–west bias 10 % 50 %, which are highest over vegetation forested areas, this...
Abstract. We present a new cloud retrieval algorithm using the O2-O2 absorption band at 477 nm, designed to provide harmonized datasets from OMI and TROPOMI. The goal of these derived data is mitigate influence clouds on tropospheric trace gases UV-visible nadir satellite spectrometers. process consists two main steps: first, spectral fitting performed Differential Optical Absorption Spectroscopy (DOAS) method determine slant column calculate reflectance center window. Second, parameters are...
Sulfur dioxide (SO2) emissions from volcanic activity have significant impacts on human health, society, aviation, and atmospheric composition in general. While nadir-viewing satellites delivered decades of valuable information the SO2 Vertical Column Density (VCD), accurate retrieval its Layer Height (LH) remains a major challenge, yet critical to further understand events refine estimates emissions, which play key role climate. Indeed, current UV techniques often face limitations...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI), aboard the Sentinel-5 Precursor (S5P) satellite launched in October 2017, is dedicated to monitoring atmospheric composition associated with air quality and climate change. This paper presents global retrieval of TROPOMI tropospheric formaldehyde (HCHO) nitrogen dioxide (NO2) vertical columns using an updated version Peking University OMI NO2 (POMINO) algorithm, which focuses on improving calculation mass factors (AMFs). algorithm...
Abstract. We present retrieval results of tropospheric nitrogen dioxide (NO2) vertical column densities (VCDs), mapped at high spatial resolution over three Belgian cities, based on the DOAS analysis Airborne Prism EXperiment (APEX) observations. APEX, developed by a Swiss-Belgian consortium behalf ESA (European Space Agency), is pushbroom hyperspectral imager characterised and spectral performance. APEX data have been acquired under clear-sky conditions two largest most heavily polluted...
Abstract. Retrievals of trace gas concentrations from satellite observations are mostly performed for clear regions or with low cloud coverage. However, even fully pixels can be affected by clouds in the vicinity, either shadowing scattering radiation region. Quantifying error retrieved due to is a difficult task. One possibility generate synthetic data three-dimensional (3D) radiative transfer simulations using realistic 3D atmospheric input data, including structures. Retrieval algorithms...
Abstract. An improved algorithm for the retrieval of total and tropospheric nitrogen dioxide (NO2) columns from Global Ozone Monitoring Experiment-2 (GOME-2) is presented. The refined will be implemented in a future version GOME Data Processor (GDP) as used by EUMETSAT Satellite Application Facility on Atmospheric Composition UV Radiation (AC-SAF). first main improvement application an extended 425–497 nm wavelength fitting window differential optical absorption spectroscopy (DOAS) NO2 slant...
Abstract. On board of the Copernicus Sentinel-5 Precursor (S5P) platform, TROPOspheric Monitoring Instrument (TROPOMI) is a double channel nadir-viewing grating spectrometer measuring solar back-scattered earthshine radiances in ultraviolet, visible, near-infrared and shortwave infrared with global daily coverage. In ultraviolet range, its spectral resolution radiometric performance are equivalent to those predecessor OMI, but horizontal at true nadir improved by an order magnitude. This...
Abstract. Three-dimensional (3D) cloud structures may impact atmospheric trace gas products from ultraviolet–visible (UV–Vis) sounders. We used synthetic and observational data to identify quantify possible cloud-related bias in NO2 tropospheric vertical column density (TVCD). The were based on high-resolution large eddy simulations which input a 3D radiative transfer model. simulated visible spectra for low-earth-orbiting geostationary geometries analysed with standard retrieval methods...
Abstract. Clouds have a strong impact on satellite measurements of tropospheric trace gases in the ultraviolet, visible, and near-infrared spectral ranges from space. Therefore, gas retrievals rely information cloud fraction, albedo, height products. In this study, parameters different retrieval algorithms for Sentinel-5 Precursor (S5P) TROPOspheric Monitoring Instrument (TROPOMI) are compared: Optical Cloud Recognition Algorithm (OCRA) priori Retrieval Of Information using Neural Networks...
Hexafluoropropylene oxide tetramer acid (HFPO-TeA) is an emerging environmental contaminant, with presence but limited toxicological information. To investigate its potential developmental toxicities, various doses of HFPO-TeA exposure were achieved in chicken embryos via air cell injection, and the exposed incubated until hatch. Within 24 h hatch, hatchling chickens assessed electrocardiography histopathology for evaluation. For mechanistic investigation, ovo silencing PPARα was lentivirus...
Abstract The complete data fusion method, generalized to the case of fusing profiles atmospheric variables retrieved on different vertical grids and referred true values, is applied ozone from simulated measurements in ultraviolet, visible, thermal infrared spectral ranges for Sentinel-4 Sentinel-5 missions Copernicus program. In this study, production characterization combined low Earth orbit (Sentinel-5) geostationary (Sentinel-4) fused performed. Fused standard products have been compared...
Abstract. Three-dimensional (3D) cloud structures may impact atmospheric trace gas products from ultraviolet-visible (UV-VIS) sounders. We used synthetic and observational data to identify quantify possible cloud-related bias in NO2 tropospheric vertical column densities (TVCD). The were based on high-resolution large eddy simulations which input a 3D radiative transfer model. simulated visible spectra for low-earth orbiting geostationary geometries analysed with standard retrieval methods...
Abstract. Operational retrievals of tropospheric trace gases from space-borne spectrometers are based on one-dimensional radiative transfer models. To minimize cloud effects, gas generally implement Lambertian models radiometric fraction estimates and photon path length corrections. The latter relies measurements the oxygen collision pair (O2-O2) absorption at 477 nm or A-band around 760 nm. In reality however, impact clouds is much more complex, involving unresolved sub-pixel clouds,...
With the launch of Sentinel-5 Precursor (S-5P, lifted-off on 13 October 2017), Sentinel-4 (S-4) and (S-5)(from 2021 2023 onwards, respectively) operational missions ESA/EU Copernicus program, a massive amount atmospheric composition data with unprecedented quality will become available from geostationary (GEO) low Earth orbit (LEO) observations. Enhanced observational capabilities are expected to foster deeper insight than ever before key issues relevant for air quality, stratospheric ozone,...