Margarita Vazquez-Navarro's research while affiliated with Leibniz-Institute of Atmospheric Physics and other places

Publications (26)

Article
Full-text available
After the eruption of volcanoes around the world, monitoring of the dispersion of ash in the atmosphere is an important task for satellite remote sensing since ash represents a threat to air traffic. In this work we present a novel method, tailored for Eyjafjallajökull ash but applicable to other eruptions as well, that uses thermal observations of...
Article
Full-text available
The Polar Multi-Sensor Aerosol product (PMAp) is based on the synergistic use of three instruments from the Metop platform, GOME-2, AVHRR, and IASI. The retrieval algorithm includes three major steps: a pre-identification of the aerosol class, a selection of the aerosol model, and a calculation of the Aerosol Optical Depth (AOD). This paper provide...
Article
Full-text available
The purpose of the EUNADICS-AV (European Natural Airborne Disaster Information and Coordination System for Aviation) prototype early warning system (EWS) is to develop the combined use of harmonised data products from satellite, ground-based and in situ instruments to produce alerts of airborne hazards (volcanic, dust, smoke and radionuclide clouds...
Preprint
Full-text available
After the eruption of volcanoes all over the world the monitoring of the dispersion of ash in the atmosphere is an important task for satellite remote sensing since ash represents a threat to air traffic. In this work we present a novel method that uses thermal observations of the SEVIRI imager aboard the geostationary Meteosat Second Generation sa...
Preprint
Full-text available
The purpose of the EUNADICS prototype Early Warning System (EWS) is to proceed the combined use of harmonise data products from satellite, ground-based and in situ instruments to produce alerts of airborne hazard (volcanic, dust, smoke and radionuclide clouds), satisfying the requirement of ATM stakeholders (www.eunadics.eu). The alert products dev...
Article
After successful launch in November 2018 and successful commissioning of Metop-C, all three satellites of the EUMETSAT Polar System (EPS) are in orbit together and operational. EPS is part of the Initial Joint Polar System (IJPS) with the US (NOAA) and provides the service in the mid-morning orbit. The Metop satellites carry a mission payload of so...
Article
Full-text available
For decades now, the retrieval of aerosol property has been successfully achieved from space-borne sensors from which measurements it is possible to derive specific parameters such as optical thickness, absorption, type, refractive index, or size distribution. In the reflective spectral domain, remote sensing of aerosol properties relies on the top...
Article
Full-text available
This study presents an analysis of TROPOMI cloud heights as a proxy for volcanic plume heights in the presence of absorbing aerosols and sulfur dioxide for the 19 February 2018 eruption plume of the Sinabung volcano on Sumatra, Indonesia. Comparison with CALIPSO satellite data shows that all three TROPOMI cloud height data products based on oxygen...
Article
Full-text available
This study presents an analysis of TROPOMI cloud heights as a proxy for volcanic plume heights in the presence of absorbing aerosols and sulfur dioxide for the 19 February 2018 eruption plume of the Sinabung volcano on Sumatra, Indonesia. Comparison with CALIPSO satellite data shows that all three TROPOMI cloud height data products based on oxygen...
Article
The study of the lifetimes of contrails from a satellite perspective benefits from the extended coverage and close temporal monitoring. However, the initial stages of the contrail development are not observed from a satellite platform due to the sub-pixel size of the forming cloud. The final stages may be unobserved as well when the contrails get s...
Article
Full-text available
The WeCare project (Utilizing Weather information for Climate efficient and eco efficient future aviation), an internal project of the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR), aimed at finding solutions for reducing the climate impact of aviation based on an improved understanding of the atmospheric impact from avia...
Article
Full-text available
A novel approach for the nowcasting of clouds and direct normal irradiance (DNI) based on the Spinning Enhanced Visible and Infrared Imager (SEVIRI) aboard the geostationary Meteosat Second Generation (MSG) satellite is presented for a forecast horizon up to 120 min. The basis of the algorithm is an optical flow method to derive cloud motion vector...
Article
Full-text available
The lifecycle of individual (initially line-shaped) contrails behind aircraft and of contrail cirrus (aged contrails mixed with other ice clouds) is described. The full contrail lifecycle is covered, from ice formation for given water, heat and particulate emissions, changes in the jet, wake and dispersion phases, until final sublimation or sedimen...
Article
Full-text available
The study of the lifetimes of contrails from a satellite perspective benefits from the extended coverage and close temporal monitoring. However, the initial stages of the contrail development are not observed from a satellite platform due to the sub-pixel size of the forming cloud. The final stages may be unobserved as well when the contrails get s...
Article
Full-text available
A novel approach for the nowcasting of clouds and Direct Normal Irradiance (DNI) based on the Spinning Enhanced Visible and Infrared Imager (SEVIRI) aboard the geostationary Meteosat Second Generation (MSG) satellite is presented for a forecast horizon up to 120 min. The basis of the algorithm is an optical flow method to derive cloud motion vector...
Article
Full-text available
The lifecycle of individual (initially line-shaped) contrails behind aircraft and of contrail cirrus (aged contrails mixed with other ice clouds) is described. The full contrail lifecycle is covered, from ice formation for given water, heat and particulate emissions, changes in the jet, wake and dispersion phases, until final sublimation or sedimen...
Article
Full-text available
The automatic contrail tracking algorithm (ACTA) – developed to automatically follow contrails as they age, drift and spread – enables the study of a large number of contrails and the evolution of contrail properties with time. In this paper we present a year's worth of tracked contrails, from August 2008 to July 2009 in order to derive statistical...
Article
Full-text available
The Automatic Contrail Tracking Algorithm (ACTA) -developed to automatically follow contrails as they age, drift and spread- enables the study of a large number of contrails and the evolution of contrail properties with time. In this paper we present a year's worth of tracked contrails, from August 2008 to July 2009 in order to derive statistically...
Technical Report
Aim of SPDERIMS is to use ECMWF data to support our remote sensing algorithms for the retrieval of water and ice cloud properties from Meteosat Second Gener- ation (MSG). In the scope of the project we use MSG data in our cloud retrieval to calculate cloudless radi- ances needed, e.g., for the calculation of cloud top height; to follow cirrus cloud...
Article
Full-text available
A new Rapid Retrieval of Upwelling irradiances from MSG/SEVIRI (RRUMS) is presented. It has been developed to observe the top-of-atmosphere irradiances of small scale and rapidly changing features that are not sufficiently resolved by specific Earth radiation budget sensors. Our retrieval takes advantage of the spatial and temporal resolution of MS...
Article
Earth's structure today is manifested in the known distribution of continents and oceans, in a variety of surface types, as well as in a surrounding atmosphere consisting of gaseous constituents, aerosols, and clouds. This complex composition defines a framework that determines the specific amounts of solar energy our planet currently absorbs, refl...
Article
Methods for detecting linear contrail pixels in satellite infrared images are described. An objective contrail detection algorithm has been developed and extensively applied to data from various polar and geostationary satellite sensors. The method uses the contrast in brightness temperatures near 11 and 12 μm wavelengths and detects linear contrai...
Article
Full-text available
A new Rapid Retrieval of upwelling fluxes from MSG/SEVIRI (RRUMS) is presented. It has been developed to observe the top-of-atmosphere irradiances of small scale and rapidly changing features that are not sufficiently resolved by specific Earth radiation budget sensors. Our retrieval takes advantage of the spatial and temporal resolution of MSG/SEV...
Article
Full-text available
A method designed to track the life cycle of contrail-cirrus using satellite data with high temporal and spatial resolution, from its formation to the final dissolution of the aviation-induced cirrus cloud is presented. The method follows the evolution of contrails from their linear stage until they are undistinguishable from natural cirrus clouds....
Article
Full-text available
A method designed to track the life cycle of contrail-cirrus using satellite data with high temporal and spatial resolution, from its formation to the final dissolution of the aviation-induced cirrus cloud is presented. The method follows the evolution of contrails from their linear stage until they are undistinguishable from natural cirrus clouds....
Article
This work describes the development of a contrail-tracking algorithm (ACTA). The algorithm follows the evolution of contrails from their linear stage until they are undistinguishable from natural cirrus clouds. Therefore, the study of the effect of aircraft-induced clouds In the atmosphere is no longer restricted to linear contrails and can include...

Citations

... Ultraviolet (UV) detection technology, which was developed after infrared and laser detection technologies, has been widely applied to environmental monitoring, chemical composition analysis, sewage detection and treatment, disaster early warning, food hygiene, and medical health, etc [1][2][3][4][5][6]. According to the wavelength range, UV can be classified into four bands: UVA (320~400nm), UVB (275~320nm), UVC (200~275nm), and UVD (100~200nm) [7]. ...
... In this study an algorithm for estimating solar radiation from space using a neural network (NN) to approximate radiative transfer calculations was developed. Similar approaches are also used for other atmospheric variables, e.g. for volcanic ash (Bugliaro et al., 2021). However, with respect to SSI, the burden of cumbersome LUTs, which require hundreds of thousands of RTM calculations, is eliminated by using the hybrid eigenvector LUT concept . ...
... A 24 channel Special Sensor Microwave Imager/Sounder carried on the Defense Meteorological Satellite Program (DMSP) F16-19 satellite series provided atmospheric temperature and moisture soundings, as well as land and ocean measurements covering a spectral range from 19.4 to 183 GHz (https://nsidc.org/ancillarypages/smmr-ssmi-ssmis-sensors). Observations from microwave instruments (ATMS, AMSU-A, AMSU-B), and high spectral resolution infrared instruments such as JPSS CrIS and MetOp IASI (Infrared Atmospheric Sounding Interferometer, Klaes et al., 2021) have been shown to have the largest impact of any observation type for reducing medium weather forecasting errors (Joo et al., 2013). IASI has high spectral sampling of 0.25 cm −1 and spectral resolution of 0.5 cm −1 over a continuous spectral range from 645 to 2760 cm −1 (3.62-15.5 μm), which provides a comparable or better retrieval than CrIS of atmospheric vertical temperature and moisture structure within its 12 km instantaneous nadir field of view. ...
... Similar statistics are obtained when limiting the data to those with optical depths above 0.2, where information content may be expected to be higher. We speculate that the reduced information content of some of the AC-TIVATE data compared to that of CAMP 2 Ex may be related to the fact that flight planning during ACTIVATE was constrained by available corridors for civil aviation to fly offshore and a desire in many cases to fly in the direction of the boundary layer wind, while during CAMP 2 Ex airplane headings were often selected to obtain observations within the principal plane, which maximizes information content for fine-mode aerosol retrievals (Fougnie et al., 2020). Furthermore, while cases influenced by cirrus above the aircraft are mostly filtered out by the cost function filter (see Sect. 2), some cases may remain in the dataset, possibly causing the prevalence of refractive index retrievals near the a priori value. ...
... Even though the maximum TROPOMI SO 2 LH agrees with the maximum backscatter height between 2-3 • latitude, a large spread of TROPOMI SO 2 LHs is also reported. As discussed also in the work of de Laat et al. (2020), the presence of either a nearly transparent or a bright cloud may result in the TROPOMI algorithm reporting heights far lower than both the ash and the cloud plumes. For the cases of Nishinoshima 2020 and La Soufrière 2021 eruptions, both provided a satisfactory collocation to the CALIOP orbital path without the difficulties found in the case of Sinabung 2018, enabling a meaningful comparison to be made. ...
... The latter would require the simulation of extended areas, i.e., images of volcanic ash clouds in different atmospheric and surface settings, which would also enable the use of convolutional neural networks for image recognition [151]. As other geostationary passive imagers have similar spectral channels as MSG/SEVIRI [69,83,85,86], the algorithm might be transferable to these instruments [152]. A thorough validation of VACOS is presented in a companion paper [80]. ...
... In their example, 80 % of contrails had a lifetime smaller than 5 h, and 5 % lived longer than 10 h. Figure 13 compares the cumulative probability density function of lifetimes of both studies, illustrating that in the present study, a comparably larger fraction of contrails has lifetimes below 3 h. Only the initial and the final stage of contrail lifetimes could be estimated by Gierens and Vazquez-Navarro (2018), as these stages are difficult to observe by satellite platforms. Ice water contents and optical depths for contrails of the REACT4C study were Whether the climate impact of contrails and contrail cirrus is warming or cooling in the respective situation is complex and involves detailed knowledge about, for example, contrail optical properties, contrail lifetimes, solar zenith angle, ambient cloud coverage, and surface properties below the contrail (e.g. ...
... Instrumental studies of contrail characteristics are difficult because the aircraft-based contact instruments provide little information (in addition, information on the orientation of ice particles cannot be obtained), and space platforms cannot observe contrails at the initial stage of formation due to their small dimensions. They become detectable by satellites 1-2 h after the emission of combustion products from aircraft engines, which is too long because the average contrail lifetime is about 1-6 h [14]. ...
... In the case of H 2 O emissions in the stratosphere, the effective RF is 2 / 2 which corresponds to 2% of the total emissions. The emission of H 2 O does not have a high direct consequence on the climate change, but it affects the contrail formation as shown in Eq. (2) to be discussed in following paragraph. ...
... This optical flow method is particularly widespread for operational precipitation nowcasting systems such as the Hong Kong Observatory's SWIRLS system or the UK Met Office's STEPS system [9,10]. Increasingly, optical flow methods have also been applied in the cloud nowcasting domain, specifically for the purpose of forecasting solar radiation at photovoltaic power plants, which is one of the main motivations of this study [11]. ...