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77
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939
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Citations since 2017
Introduction
Additional affiliations
January 2012 - present
February 2011 - December 2011
November 2010 - January 2011
Education
October 2008 - June 2009
October 2006 - June 2009
October 2002 - June 2006
Publications
Publications (77)
A method is developed that removes a priori information from remotely sensed atmospheric state profiles. This consists of a Wiener deconvolution, whereby the required cost function is obtained from the complete data fusion framework. Asserting that the deconvoluted averaging kernel matrix has to equal the unit matrix, results in an iterative proces...
Ozone in the troposphere affects humans and ecosystems as a pollutant and as a
greenhouse gas. Observing, understanding and modelling this dual role, as
well as monitoring effects of international regulations on air quality and
climate change, however, challenge measurement systems to operate at opposite
ends of the spatio-temporal scale ladder. Ab...
Accurate knowledge of cloud properties is essential to the measurement of atmospheric composition from space. In this work we assess the quality of the cloud data from three Copernicus Sentinel-5 Precursor (S5P) TROPOMI cloud products: (i) S5P OCRA/ROCINN_CAL (Optical Cloud Recognition Algorithm/Retrieval of Cloud Information using Neural Networks;...
Remote sensing of the atmospheric composition from current and future satellites, such as the Sentinel missions of the Copernicus programme, yields an unprecedented amount of data to monitor air quality, ozone, UV radiation and other climate variables. Hence, full exploitation of the growing wealth of information delivered by spaceborne observing s...
MIPAS is a Fourier Transform interferometer that measured the atmospheric emission at limb in the middle infrared on board the ENVISAT satellite. These measurements allowed the global monitoring of the three-dimensional (latitude, longitude and altitude) distribution of concentrations of many species, during both day and night, for 10 years, from J...
Remote sensing of atmospheric state variables typically relies on the inverse solution of the radiative transfer equation. An adequately characterized retrieval provides information on the uncertainties of the estimated state variables as well as on how any constraint or a priori assumption affects the estimate. Reported characterization data shoul...
The QA4ECV (Quality Assurance for Essential Climate Variables) version 1.1 stratospheric and tropospheric NO2 vertical column density (VCD) climate data records (CDRs) from the OMI (Ozone Monitoring Instrument) satellite sensor are validated using NDACC (Network for the Detection of Atmospheric Composition Change) zenith-scattered light differentia...
Ozone in the troposphere affects humans and ecosystems as a pollutant and as a greenhouse gas. Observing, understanding and modelling this dual role, as well as monitoring effects of international regulations on air quality and climate change, however, challenge measurement systems to operate at opposite ends of the spatio-temporal scale ladder. On...
Accurate knowledge of cloud properties is essential to the measurement of atmospheric composition from space. In this work we assess the quality of the cloud data derived from Copernicus Sentinel-5 Precursor (S5P) TROPOMI radiance measurements: cloud top height and cloud optical thickness (retrieved with the S5P OCRA/ROCINN_CAL algorithm), cloud he...
AURORA (Advanced Ultraviolet Radiation and Ozone Retrieval for Applications) is a three-year project supported by the European Union in the frame of its H2020 Call (EO-2-2015) for “Stimulating wider research use of Copernicus Sentinel Data”. The project addresses key scientific issues relevant for synergistic exploitation of data acquired in differ...
Abstract. The QA4ECV version 1.1 stratospheric and tropospheric NO<sub>2</sub> vertical column density (VCD) climate data records (CDR) from the satellite sensor OMI are validated, using NDACC zenith scattered light DOAS (ZSL-DOAS) and Multi Axis-DOAS (MAX-DOAS) data as a reference. The QA4ECV OMI stratospheric VCD have a small bias of ~ 0.2 Pmolec...
Remote sensing of atmospheric state variables typically relies on the inverse solution of the radiative transfer equation. An adequately characterized retrieval provides information on the uncertainties of the estimated state variables as well as on how any constraint or a priori assumption affects the estimate. Reported characterization data shoul...
In October 2017, the Sentinel-5 Precursor (S5P) mission was launched,
carrying the TROPOspheric Monitoring Instrument (TROPOMI), which provides a
daily global coverage at a spatial resolution as high as 7 km × 3.5 km and
is expected to extend the European atmospheric composition record initiated
with GOME/ERS-2 in 1995, enhancing our scientific kno...
Many applications of atmospheric composition and climate data involve the comparison or combination of vertically resolved atmospheric state variables. Calculating differences and combining data require harmonization of data representations in terms of physical quantities and vertical sampling at least. If one or both datasets result from a retriev...
In October 2017, the Sentinel-5 Precursor (S5p) mission was launched, carrying the TROPOspheric Monitoring Instrument, TROPOMI, which provides a daily global coverage at a spatial resolution as high as 7 km × 3.5 km and is expected to extend the European atmospheric composition record initiated with GOME/ERS-2 in 1995, bringing up significant new c...
Many applications of atmospheric composition and climate data involve the comparison or combination of vertically resolved atmospheric state variables. Calculating differences and combining data require harmonization of data representations in terms of physical quantities and vertical sampling at least. If one or both datasets result from a retriev...
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a limb-viewing infrared Fourier transform spectrometer that operated from 2002 to 2012 onboard the ENVISAT satellite. The analysis of MIPAS measurements allows to study the temporal evolution of numerous species of interest for the study of the ozone in the stratosphere, pollu...
With the launch of the Sentinel-5 Precursor (S-5P, lifted-off on 13 October 2017), Sentinel-4 (S-4) and Sentinel-5 (S-5)(from 2021 and 2023 onwards, respectively) operational missions of the ESA/EU Copernicus program, a massive amount of atmospheric composition data with unprecedented quality will become available from geostationary (GEO) and low E...
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a limb-viewing infrared Fourier transform spectrometer that operated from 2002 to 2012 onboard the ENVISAT satellite. The maintenance and the upgrade of both L1 and L2 ESA processors are accomplished in the frame of the Quality Working Group, where a fruitful collaboration amo...
This paper assesses the quality of IASI (Infrared Atmospheric Sounding Interferometer)/Metop-A (IASI-A) and IASI/Metop-B (IASI-B) ozone (O3) products (total and partial O3 columns) retrieved with the Fast Optimal Retrievals on Layers for IASI Ozone (FORLI-O3; v20151001) software for 9 years (2008–July 2017) through an extensive intercomparison and...
Atmospheric ozone plays a key role in
air quality and the radiation budget of the Earth, both directly and through
its chemical influence on other trace gases. Assessments of the atmospheric
ozone distribution and associated climate change therefore demand accurate
vertically resolved ozone observations with both stratospheric and
tropospheric sens...
This document describes the methodology adopted in the C3S_312a_Lot4 – Ozone procurement service for the quality assurance of the C3S ozone CDRs, with details on the ground-based measurements used as a reference for satellite validation, the specific technical solutions implemented to enable level-3 and level-4 data comparisons, and the metrics dev...
The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) is a level-3 data record, which combines individual sensor products into one single cohesive record covering the 22-year period from 1995 to 2016, generated in the frame of the European Space Agency's Climate Change Initiative Phase II. It is based on level-2 total ozone data produced b...
This paper assesses the quality of IASI/Metop-A (IASI-A) and IASI/Metop-B (IASI-B) ozone (O3) products (total and partial O3 columns) retrieved with the Fast Optimal Retrievals on Layers for IASI Ozone (FORLI-O3) v20151001 software for nine years (2008–2017) through an extensive inter-comparison and validation exercise using independent observation...
Atmospheric ozone plays a key role in air quality and the radiation budget of the Earth, both directly and through its chemical influence on other trace gases. Assessments of the atmospheric ozone distribution and associated climate change therefore demand accurate vertically-resolved ozone observations with both stratospheric and tropospheric sens...
The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) is a Level-3 data record, which combines individual sensor products into one single cohesive record covering the 22 year period from 1995 to 2017, generated in the frame of the European Space Agency's Climate Change Initiative Phase-II. It is based on Level-2 total ozone data produced b...
MIPAS on ENVISAT performed almost continuous measurements of atmospheric composition from June 2002 to April 2012. ESA Level 2 processor, based on the Optimized Retrieval Model (ORM), originally designed for the Near Real Time analysis and developed by an European Consortium led by IFAC, is currently refined and used for the reanalysis of the full...
Can be downloaded at https://cds.climate.copernicus.eu/cdsapp#!/dataset/ozone-monthly-gridded-data-from-1970-to-present?tab=doc
This document describes the methodology adopted in the C3S_312a_Lot4 – Ozone procurement service for the quality assurance of the C3S ozone CDRs, with details on the ground-based measurements used as a reference for satellite validation, the specific technical solutions implemented to enable level-3 and level-4 data comparisons, and the metrics dev...
Available at https://earth.esa.int/documents/700255/2683862/TN-BIRA-IASB-MultiTASTE-Phase-F-SCIA-SGP6-Iss1-RevB.pdf
While it has become evident that the ozone trend has changed sign around the mid-1990s, the debate is still open as to how uncertain the profile trend estimates are. There is currently no community-wide consensus whether there is statistically significant observational evidence for the recovery of stratospheric ozone. As a step forward, we review t...
Available at https://earth.esa.int/documents/700255/2621625/TN-BIRA-IASB-MultiTASTE-Phase-F-MIPAS-ML2PP7-Iss1-RevB
The ozone profile records of a large number of limb and occultation satellite
instruments are widely used to address several key questions in ozone
research. Further progress in some domains depends on a more detailed
understanding of these data sets, especially of their long-term stability and
their mutual consistency. To this end, we made a syste...
Atmospheric ozone is an Essential Climate Variable which impacts the radiation budget of the Earth, interacts with atmospheric dynamics and climate, and influences chemically other radiatively active species. As part of the Ozone Climate Change Initiative (Ozone_cci) project, a large number of ozone data sets have been generated from a full suite o...
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ESA's ENVISAT satellite performed almost continuous measurements of the global atmospheric composition for approximately 10 years, from July 2002 to April 2012. The operational ESA data retrieval processor, based on the algorithm ORM (Optimized Retrieval Model), originally des...
Available at https://earth.esa.int/documents/700255/708299/TN-BIRA-IASB-MultiTASTE-Phase-F-VR1-Iss2-RevA.pdf
The ozone profile records of a large number of limb and occultation satellite instruments are widely used to address several key questions in ozone research. Further progress in some domains depends on a more detailed understanding of these data sets, especially of their long-term stability and their mutual consistency. To this end, we make a syste...
The MIPAS spectrometer onboard the Envisat platform observed infrared emission from the Earth's limb between 2002 and 2012. It recorded high-resolution spectra during day and night, from pole to pole and between 6 and 70 km altitude in the nominal measurement mode or up to 170 km in special measurement modes, producing daily more than 1000 vertical...
A methodology for the round-robin evaluation and the geophysical validation of
ozone profile data retrieved from nadir UV backscatter satellite
measurements is detailed and discussed, consisting of data set content
studies, information content studies, co-location studies, and comparisons
with reference measurements. Within the European Space Agenc...
Daily global analyses and 5-day forecasts are generated in the context of
the European Monitoring Atmospheric Composition and Climate (MACC) project
using an extended version of the Integrated Forecasting System (IFS) of the
European Centre for Medium-Range Weather Forecasts (ECMWF). The IFS now
includes modules for chemistry, deposition and emissi...
Daily global analyses and 5 day forecasts are generated in the context of the European Monitoring Atmospheric Composition and Climate (MACC) project using an extended version of the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts (ECMWF). IFS now includes modules for chemistry, deposition and emission o...
A methodology for the round-robin evaluation and geophysical validation of ozone profile data
retrieved from nadir UV backscatter satellite measurements is detailed and discussed, consisting
of dataset content studies, information content studies, co-location studies, and comparisons with
reference measurements. Within ESA's Climate Change Initiati...
The electrical-thermal-optical characteristics of AlGaInP yellow and InGaN/GaN blue LEDs under electrical stresses were studied. Since the increase of effective acceptor concentration on p-type side, the forward voltages of AlGaInP decrease after 3155 h aging. And the operating voltage of high forward bias expansion for InGaN/GaN is due to the incr...
Over the past 30 years various space-based limb-looking instruments have recorded complementary data on the distribution of ozone in the Earth’s atmosphere. The synergistic use of those data records will improve, on the global scale and in the long term, our understanding of interactions between changes in ozone, ultraviolet radiation and climate....
Various international initiatives intend to build a merged data record on the vertical profile of ozone, an Essential Climate Variable, which should allow the study of processes on the long term and at the global scale. With its three atmospheric limb profilers, Envisat adds significantly to the pseudo-global ozone profile monitoring initiated sinc...
The relative spectral radiant flux error caused by phosphor fluorescence during integrating sphere measurements is investigated both theoretically and experimentally. Integrating sphere and goniophotometer measurements are compared and used for model validation, while a case study provides additional clarification. Criteria for reducing fluorescenc...