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  1. Article ; Online: Remote Sensing of Soil Organic Carbon

    Van Wesemantel, B. / Chabrillat, S.

    Encyclopedia of Soils in the Environment

    2023  

    Abstract: Encyclopedia of Soils in the Environment, Second Edition, Five Volume Set updates and expands the previous version to ensure coverage of topics relevant to current world problems such as population pressure, food security and global change. Since ... ...

    Abstract Encyclopedia of Soils in the Environment, Second Edition, Five Volume Set updates and expands the previous version to ensure coverage of topics relevant to current world problems such as population pressure, food security and global change. Since publication of the previous edition there has been a huge change in our ability to carry out bioinformatics related to soil organisms and their functioning. Major developments in next generation DNA sequencing techniques have made it possible to identify both the diversity of microbial populations and their functioning. Furthermore, it allows the management of microbes within the soil. Imaging is changing our perceptions and improving our knowledge of soil aggregation. This also applies to remote and proximal sensing of laboratory and field soils, which is undergoing rapid change. Soil physics is a core area of soil science, but new techniques and technology have increased our understanding of processes. This reference work covers the entire field of soil science, bridging the gap between basic science and applications, and is designed to serve students and expert researchers. It is organized around four core topics, the main components of soil science – biology, chemistry, physics and environment and management. Soil science is becoming a crucial subject as world governments realize its importance in food production, water quality, flood control, greenhouse gas management, source of antibiotics and other drugs. As such this work is of interest not only to academics but to policy makers, government researchers and the geographical and environmental community who are not necessarily in research roles but need information on soil to support their core work.
    Subject code 910
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Conference proceedings ; Online: Implementation of sulfur hexafluoride (SF6) in the Belgian Assimilation System for Chemical ObsErvations

    Vervalcke, S. / Errera, Q. / Chabrillat, S.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: Sulfur hexafluoride (SF 6 ) is a greenhouse gas that is emitted at the surface because of its use as an insulator in electric power systems. Due to its quasi-linear emission growth and its very long lifetime, SF 6 can be used as a tracer for the Age of ... ...

    Abstract Sulfur hexafluoride (SF 6 ) is a greenhouse gas that is emitted at the surface because of its use as an insulator in electric power systems. Due to its quasi-linear emission growth and its very long lifetime, SF 6 can be used as a tracer for the Age of Air (AoA) to diagnose changes in the Brewer Dobson Circulation (BDC). The chemistry of SF 6 has been implemented in the Chemistry Transport Model (CTM) of the Belgian Assimilation System for Chemical ObsErvations (BASCOE). Reaction rates were taken from previous studies while an electron density has been taken from EMAC simulations. In this contribution, BASCOE-CTM simulations driven by ERA5 and MERRA2 will be discussed considering SF 6 with and without mesospheric sinks (i.e. passive SF 6 in the latter case). During the course of the simulations, the computed mixing ratios have also been saved in the space of MIPAS observations to analyse the impact of the MIPAS sampling in its AoA derivation.
    Language English
    Publishing date 2023-07-11
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: Soil Organic Carbon Modelling Using Open-Access Soil Spectroscopy Libraries and Machine Learning Algorithms.

    Saberioon, M. / Gholizadeh, A. / Ghaznavi, A. / Chabrillat, S. / Ward, K.

    2022  

    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Conference proceedings ; Online: EnMAP

    Schickling, A. / Chabrillat, S. / Storch, T. / Fischer, S.

    Conference Papers

    The German spaceborne imaging spectroscopy mission

    2021  

    Abstract: The Environmental Mapping and Analysis Program (EnMAP) is a spaceborne German hyperspectral satellite mission that aims at monitoring and characterizing the Earth’s environment on a global scale. This paper presents an update of the mission status with ... ...

    Abstract The Environmental Mapping and Analysis Program (EnMAP) is a spaceborne German hyperspectral satellite mission that aims at monitoring and characterizing the Earth’s environment on a global scale. This paper presents an update of the mission status with developments from the space and the ground segment. © 2021 The Author (s).
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Remote Sensing for Soil Organic Carbon Mapping and Monitoring

    van Wesemael, B. / Chabrillat, S. / Sanz Dias, A. / Berger, M. / Szantoi, Z.

    Remote Sensing

    2023  

    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Analyses of Namibian Seasonal Salt Pan Crust Dynamics and Climatic Drivers Using Landsat 8 Time-Series and Ground Data

    Milewski, R. / Chabrillat, S. / Bookhagen, B.

    Remote Sensing

    2020  

    Abstract: Salt pans are highly dynamic environments that are difficult to study by in situ methods because of their harsh climatic conditions and large spatial areas. Remote sensing can help to elucidate their environmental dynamics and provide important ... ...

    Abstract Salt pans are highly dynamic environments that are difficult to study by in situ methods because of their harsh climatic conditions and large spatial areas. Remote sensing can help to elucidate their environmental dynamics and provide important constraints regarding their sedimentological, mineralogical, and hydrological evolution. This study utilizes spaceborne multitemporal multispectral optical data combined with spectral endmembers to document spatial distribution of surface crust types over time on the Omongwa pan located in the Namibian Kalahari. For this purpose, 49 surface samples were collected for spectral and mineralogical characterization during three field campaigns (2014–2016) reflecting different seasons and surface conditions of the salt pan. An approach was developed to allow the spatiotemporal analysis of the salt pan crust dynamics in a dense time-series consisting of 77 Landsat 8 cloud-free scenes between 2014 and 2017, covering at least three major wet–dry cycles. The established spectral analysis technique Sequential Maximum Angle Convex Cone (SMACC) extraction method was used to derive image endmembers from the Landsat time-series stack. Evaluation of the extracted endmember set revealed that the multispectral data allowed the differentiation of four endmembers associated with mineralogical mixtures of the crust’s composition in dry conditions and three endmembers associated with flooded or muddy pan conditions. The dry crust endmember spectra have been identified in relation to visible, near infrared, and short-wave infrared (VNIR–SWIR) spectroscopy and X-ray diffraction (XRD) analyses of the collected surface samples. According these results, the spectral endmembers are interpreted as efflorescent halite crust, mixed halite–gypsum crust, mixed calcite quartz sepiolite crust, and gypsum crust. For each Landsat scene the spatial distribution of these crust types was mapped with the Spectral Angle Mapper (SAM) method and significant spatiotemporal dynamics of the major surface crust types were observed. Further, the surface crust dynamics were analyzed in comparison with the pan’s moisture regime and other climatic parameters. The results show that the crust dynamics are mainly driven by flooding events in the wet season, but are also influenced by temperature and aeolian activity in the dry season. The approach utilized in this study combines the advantages of multitemporal satellite data for temporal event characterization with advantages from hyperspectral methods for the image and ground data analyses that allow improved mineralogical differentiation and characterization.
    Subject code 550
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Estimating heavy metal concentrations in Technosols with reflectance spectroscopy

    Kästner, F. / Suht-Lohmann, M. / Ramezany, S. / Raab, T. / Feilhauer, H. / Chabrillat, S.

    Geoderma

    2022  

    Abstract: Reflectance spectroscopy in the visible-infrared and shortwave infrared (450–2500 nm) wavelength region is a rapid, cost-effective and non-destructive method that can be used to monitor heavy metal (PTE, potential toxic elements) contaminated areas. Due ... ...

    Abstract Reflectance spectroscopy in the visible-infrared and shortwave infrared (450–2500 nm) wavelength region is a rapid, cost-effective and non-destructive method that can be used to monitor heavy metal (PTE, potential toxic elements) contaminated areas. Due to the PTE pollution that has accumulated in the course of wastewater treatment, the existence of Technosols presents an environmental problem, a potential source for PTE uptake by vegetation, or even the release of PTEs into groundwater. In this study, multivariate procedures using Partial Least Squares Regression (PLSR) and Random Forest Regression (RFR) are applied to quantify relationships between soil heavy metal concentration (Cr, Cu, Ni, Zn) and reflectance data of highly contaminated Technosols from a former sewage farm near Berlin, Germany. Laboratory measurements of 110 soil samples in four different preparation steps were acquired with HySpex hyperspectral cameras. The impact of the different preparation steps, namely “oven-dried”, “sieved”, “ground”, “LOI”, was evaluated for its potential to enhance the method performance or to reduce the time-consuming soil sample preparation. Furthermore, different spectral pre-processing methods were evaluated regarding improvements of spectral modelling performance and their ability to minimise noise and multiple scattering effects. Considering the optimal coefficient of determination (R2), PLSR shows an improving performance and accuracy with increasing preparation steps such as ground or LOI for all metals of interest (R2_Cr: 0.52–0.78; R2_Cu: 0.36–0.73; R2_Ni: 0.19–0.42 and R2_Zn: 0.41–0.74). RFR shows a weaker estimation performance for all metals, even when using higher sample preparation levels (R2_Cr: 0.36–0.62; R2_Cu: 0.17–0.72; R2_Ni: 0.20–0.35 and R2_Zn: 0.26–0.67). The results show that an application of methods such as PLSR for the prediction of PTE concentration in Technosols is still a challenge but provides more robust estimations than the user-friendly RFR method. Additionally, this study shows ...
    Subject code 500
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Evaluation of Airborne HySpex and Spaceborne PRISMA Hyperspectral Remote Sensing Data for Soil Organic Matter and Carbonates Estimation

    Angelopoulou, T. / Chabrillat, S. / Pignatti, S. / Milewski, R. / Karyotis, K. / Brell, M. / Ruhtz, T. / Bochtis, D. / Zalidis, G.

    Remote Sensing

    2023  

    Abstract: Remote sensing and soil spectroscopy applications are valuable techniques for soil property estimation. Soil organic matter (SOM) and calcium carbonate are important factors in soil quality, and although organic matter is well studied, calcium carbonates ...

    Abstract Remote sensing and soil spectroscopy applications are valuable techniques for soil property estimation. Soil organic matter (SOM) and calcium carbonate are important factors in soil quality, and although organic matter is well studied, calcium carbonates require more investigation. In this study, we validated the performance of laboratory soil spectroscopy for estimating the aforementioned properties with referenced in situ data. We also examined the performance of imaging spectroscopy sensors, such as the airborne HySpex and the spaceborne PRISMA. For this purpose, we applied four commonly used machine learning algorithms and six preprocessing methods for the evaluation of the best fitting algorithm. The study took place over crop areas of Amyntaio in Northern Greece, where extensive soil sampling was conducted. This is an area with a very variable mineralogical environment (from lignite mine to mountainous area). The SOM results were very good at the laboratory scale and for both remote sensing sensors with R2 = 0.79 for HySpex and R2 = 0.76 for PRISMA. Regarding the calcium carbonate estimations, the remote sensing accuracy was R2 = 0.82 for HySpex and R2 = 0.36 for PRISMA. PRISMA was still in the commissioning phase at the time of the study, and therefore, the acquired image did not cover the whole study area. Accuracies for calcium carbonates may be lower due to the smaller sample size used for the modeling procedure. The results show the potential for using quantitative predictions of SOM and the carbonate content based on soil and imaging spectroscopy at the air and spaceborne scales and for future applications using larger datasets.
    Subject code 550
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Book ; Online: In-Situ Measurements for Validation Purposes. V.1.3.

    Brell, M. / Milewski, R. / Neumann, C. / Ong, C. / Lau, I. / Hank, T. / Förster, S. / Chabrillat, S.

    EnMAP Field Guides Technical Report

    2023  

    Abstract: In support of the Environmental Mapping & Analysis Program (EnMAP) mission [1], the acquisition of accurate and comparable spectroradiometric in-situ measurements is crucial for vicarious validation of the official EnMAP data products [2]. This document ... ...

    Abstract In support of the Environmental Mapping & Analysis Program (EnMAP) mission [1], the acquisition of accurate and comparable spectroradiometric in-situ measurements is crucial for vicarious validation of the official EnMAP data products [2]. This document provides a guide on properly conducting spectroradiometric field measurements within the scope of EnMAP. It is a summary, of the detailed technical handbook developed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) [3], the approach established by the Remote Sensing Laboratories (RSL, University of Zurich) [4], on the bases of „Progress in field spectroscopy“ [5], “Field and airborne spectroscopy cross validation - Some considerations” [6] and the experience gained throughout numerous validation efforts for air- and spaceborne sensors by the Remote Sensing and Geoinformatics section at the GFZ Potsdam that have been specially adapted for EnMAP purposes. The following procedure should be used when conducting in-situ measurements of terrestrial surfaces to obtain consistent measurements by applying a repeatable approach throughout the validation phase of the EnMAP mission.
    Language English
    Publisher GFZ Data Services
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Conference proceedings ; Online: Operational forecasts of stratospheric chemistry and aerosols by the ECMWF Integrated Forecasting System for the Copernicus Atmosphere Monitoring Service (CAMS)

    Chabrillat, S. / Bingen, C. / Errera, Q. / Huijnen, V. / Metzger, S. / Minganti, D. / Remy, S. / William, J. / Flemming, J.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: The ECMWF’s Integrated Forecast System (IFS) is the global atmospheric model used by the Copernicus Atmosphere Monitoring Service (CAMS) to provide analyses and forecasts on atmospheric composition. While the IFS configuration used operationally until ... ...

    Abstract The ECMWF’s Integrated Forecast System (IFS) is the global atmospheric model used by the Copernicus Atmosphere Monitoring Service (CAMS) to provide analyses and forecasts on atmospheric composition. While the IFS configuration used operationally until June 2023 comprised a chemistry scheme and an aerosol module designed only for tropospheric composition, it has now been upgraded (cycle 48R1) to solve also for stratospheric chemistry and sulfate aerosols. We describe these two modules and their latest developments, evaluating hindcasts of stratospheric composition across eight winter-spring seasons above the polar regions and different aerosol case studies including quiescent and volcanic periods.The new stratospheric chemistry module, IFS(BASCOE), is evaluated against the BASCOE Reanalysis of Aura-MLS (BRAM) demonstrating its capacity to forecast the chemical composition of the polar lower stratosphere above both the Arctic and the Antarctic for five years with very different evolutions of the polar vortices. The current performance allows us to study the interannual variability of ozone hole episodes, including the exceptional Antarctic 2020 event.The stratospheric extension of the aerosol module has been coupled to IFS(BASCOE) through sulphuric acid, the radiation scheme, and the 4Dvar assimilation scheme. Intercomparisons with aerosol-related datasets (GloSSAC, GOMOS-AerGOM, AERONET, TROPOMI-SO2) and simulations by WACCM-CARMA show reasonable agreement for the post-Pinatubo event (1991-1995), a quiescent period (1997-1999), the early Envisat period (2002-2004) and the Raikoke eruption (June 2019). The Raikoke test shows that the chain from (volcanic) trace gas increments, impacting consecutively SO 2 , sulfate, radiation, and temperature, is functional and ready to be tested in data assimilation mode.
    Subject code 333
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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