Polarization sensitivity error analysis and measurement of a greenhouse gas monitoring instrument

2018 ◽  
Vol 57 (34) ◽  
pp. 10009
Author(s):  
Hai-Yan Luo ◽  
Zhi-Wei Li ◽  
Zhen-Wei Qiu ◽  
Hai-Liang Shi ◽  
Di-Hu Chen ◽  
...  
Keyword(s):  
Error Analysis ◽  
Greenhouse Gas ◽  
Polarization Sensitivity ◽  
Gas Monitoring ◽  
Monitoring Instrument

First Level 1 Product Results of the Greenhouse Gas Monitoring Instrument on the GaoFen-5 Satellite

2020 ◽  
pp. 1-16
Author(s):  
Hailiang Shi ◽  
Zhiwei Li ◽  
Hanhan Ye ◽  
Haiyan Luo ◽  
Wei Xiong ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Gas Monitoring ◽  
Monitoring Instrument ◽  
Level 1

Hochaufgelöste Simulation von meteorologischen Feldern in urbanen Räumen mit dem Weather Research and Forecasting (WRF) Modell

2021 ◽  
Author(s):  
Lukas N. Pilz ◽  
Sanam N. Vardag ◽  
Joachim Fallmann ◽  
André Butz
Keyword(s):  
Greenhouse Gas ◽  
Monitoring System ◽  
Weather Research And Forecasting ◽  
Gas Monitoring ◽  
Weather Forecasts ◽  
European Centre ◽  
Medium Range ◽  
Erste Ergebnisse ◽  
Weather Research

<p><span>Städte und Kommunen sind für mehr als 70% </span><span>der globalen, fossilen CO2-Emissionen</span><span> verantwortlich, sodass hier ein enormes Mitigationspotential besteht. Informationen über (inner-)städtische CO2-Emissionen stehen allerdings oft nicht </span><span>in hoher zeitlicher und räumlicher Auflösung</span><span> zur Verfügung und sind </span><span>meist</span><span> mit großen Unsicherheiten behaftet. Diese Umstände erschweren eine zielgerichtete und effiziente Mitigation im urbanen Raum. </span><span>Städtische Messnetzwerke können als unabhängige Informationsquelle einen Beitrag leisten, um CO2-Emissionen in Städten zu quantifizieren und Mitigation zu verifizieren</span><span>. </span><span>Verschiedene denkbare Beobachtungsstrategien sollten</span><span> im Vorfeld abgewägt werden, um urbane Emissionen bestmöglich, d.h. mit der erforderlichen Genauigkeit und </span><span>Kosteneffizienz</span><span> zu quantifizieren. So können Messnetzwerke die Basis für zielgerichtete und kosteneffiziente Mitigation legen.</span></p><p><span>Im Rahmen des Verbundvorhabens „Integrated Greenhouse Gas Monitoring System for Germany“ (ITMS) werden wir verschiedene Beobachtungsstrategien für urbane Räume entwerfen und mit Hilfe von Modellsimulation evaluieren und abwägen. Notwendige Voraussetzung für </span><span>die Evaluation der Strategien</span><span> ist eine akkurate Repräsentation des atmosphärischen Transports im Modell.</span></p><p><span>Diese Studie zeigt</span><span> erste Ergebnisse der hochauflösenden (1kmx1km) meteorologischen Simulationen für den Rhein-Neckar-Raum mit dem WRF Modell. </span><span>Die in WRF simulierten meteorologischen Größen werden für verschiedene Modellkonfigurationen mit </span><span>re-analysierten Daten des European Centre for Medium-Range Weather Forecasts (ECMWF) und ausgewählten Messstationen verglichen. Damit evaluieren wir </span><span>den Einfluss unterschiedlicher Nudging-Strategien, Parametrisierungen physikalischer Prozesse und urbaner Interaktionen</span><span> auf </span><span>die Modellperformance</span> <span>von</span><span> Lufttemperatur, Windrichtung, Windgeschwindigkeit und Grenzschichthöhe. Durch diese Analysen gewährleisten wir, dass die Simulation der Beobachtungsstrategien auf robuste</span><span>m</span><span> und realistische</span><span>m</span><span> atmosphärischen Transport basieren und schlussendlich repräsentative Empfehlungen für den Aufbau von Messnetzwerken liefern können. </span></p>

History and Sites of Atmospheric Greenhouse Gas Monitoring in Hungary

2010 ◽  
pp. 9-27 ◽  
Author(s):  
László Haszpra ◽  
Zoltán Barcza ◽  
István Szilágyi
Keyword(s):  
Greenhouse Gas ◽  
Gas Monitoring

First Year On-Orbit Calibration of the Chinese Environmental Trace Gas Monitoring Instrument Onboard GaoFen-5

2020 ◽  
Vol 58 (12) ◽  
pp. 8531-8540
Author(s):  
MinJie Zhao ◽  
FuQi Si ◽  
Yu Wang ◽  
HaiJin Zhou ◽  
ShiMei Wang ◽  
...  
Keyword(s):  
Trace Gas ◽  
First Year ◽  
Gas Monitoring ◽  
Monitoring Instrument

Single Instrument Solution for Air Quality and Greenhouse Gas Monitoring in Cities

2020 ◽  
Author(s):  
Morten Hundt ◽  
Oleg Aseev ◽  
Herbert Looser
Keyword(s):  
Air Quality ◽  
Greenhouse Gases ◽  
Environmental Monitoring ◽  
Greenhouse Gas ◽  
Quantum Cascade Lasers ◽  
Atmospheric Measurements ◽  
Gas Monitoring ◽  
Spatial And Temporal Scales ◽  
Laser Absorption ◽  
Single Instrument

<p>Observation of air pollutants and greenhouse gases with high selectivity and sensitivity is of great importance for our understanding of their sources and sinks. For air pollution modelling and validation of emission inventories measurements at various spatial and temporal scales are required. Infrared laser absorption spectroscopy is often the method of choice, offering outstanding performance and reliability. Most frequently, however, this technology is used in a “one-species-one-instrument” solution because of the narrow spectral coverage of DFB-lasers. This can be overcome by combining several Quantum Cascade Lasers (QCLs), providing unique solutions in compact laser absorption spectrometers for environmental monitoring of multiple species in a single instrument.</p><p>We combined multiple DFB-QCLs into a single, compact laser absorption spectrometer to measure up to ten different compounds. We present simultaneous atmospheric measurements of the greenhouse gases CO<sub>2</sub>, N<sub>2</sub>O, H<sub>2</sub>O and CH<sub>4</sub>, and the pollutants CO, NO, NO<sub>2</sub>, O<sub>3</sub>, SO<sub>2</sub> and NH<sub>3</sub> with a single instrument. Furthermore, the instrument performance, first field results and comparison to standard air-quality and greenhouse gas monitoring instrumentation are discussed. The results demonstrate that spectrometers using QCLs can serve as an all-in-one solution for environmental monitoring stations replacing up to seven instruments at once. Furthermore, due to their reduced size and robustness, they can be used on mobile platforms, opening up new applications of air quality and greenhouse gas monitoring in cities.</p>

Dual-comb Spectroscopy for City-scale Open Path Greenhouse Gas Monitoring

2016 ◽  
Author(s):  
G.-W. Truong ◽  
E.M. Waxman ◽  
K.C. Cossel ◽  
F.R. Giorgetta ◽  
W.C. Swann ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Gas Monitoring ◽  
Open Path

Towards robust global greenhouse gas monitoring

2011 ◽  
Vol 1 (2) ◽  
pp. 80-84 ◽  
Author(s):  
Riley M. Duren ◽  
Charles E. Miller
Keyword(s):  
Greenhouse Gas ◽  
Gas Monitoring

scholarly journals STITCHING TYPE LARGE APERTURE DEPOLARIZER FOR GAS MONITORING IMAGING SPECTROMETER

2018 ◽  
Vol XLII-3 ◽  
pp. 1141-1144
Author(s):  
X. Liu ◽  
M. Li ◽  
N. An ◽  
T. Zhang ◽  
G. Cao ◽  
...  
Keyword(s):  
Design Theory ◽  
Wedge Angle ◽  
Calculation Model ◽  
Polarization Degree ◽  
Polarization Sensitivity ◽  
Gas Monitoring ◽  
Imaging Spectrometer ◽  
Large Aperture ◽  
Incoming Beam ◽  
Combination Device

To increase the accuracy of radiation measurement for gas monitoring imaging spectrometer, it is necessary to achieve high levels of depolarization of the incoming beam. The preferred method in space instrument is to introduce the depolarizer into the optical system. It is a combination device of birefringence crystal wedges. Limited to the actual diameter of the crystal, the traditional depolarizer cannot be used in the large aperture imaging spectrometer (greater than 100 mm). In this paper, a stitching type depolarizer is presented. The design theory and numerical calculation model for dual babinet depolarizer were built. As required radiometric accuracies of the imaging spectrometer with 250 mm × 46 mm aperture, a stitching type dual babinet depolarizer was design in detail. Based on designing the optimum structural parmeters，the tolerance of wedge angle，refractive index, and central thickness were given. The analysis results show that the maximum residual polarization degree of output light from depolarizer is less than 2 %. The design requirements of polarization sensitivity is satisfied.

Towards operational use of satellite SO2 measurements in a volcano observatory

2021 ◽  
Author(s):  
Matthieu Epiard ◽  
Simon Carn
Keyword(s):  
Data Processing ◽  
Low Income ◽  
Ground Deformation ◽  
Gas Monitoring ◽  
Volcanic Gas ◽  
Gas Emissions ◽  
Monitoring Instrument ◽  
Monitoring Techniques ◽  
Volcano Observatory ◽  
Volcano Observatories

<p>Along with monitoring of seismic activity and ground deformation, the measurement of volcanic gas emissions and composition plays a key role in the surveillance of active volcanoes and the mitigation of volcanic hazards. Volcanic gas emissions also potentially impact the environment, human health and climate, providing further motivation for study. Currently, volcano observatories typically employ ground-based or airborne techniques to monitor volcanic gas emissions, mainly sulfur dioxide (SO<sub>2</sub>) fluxes and its ratios over other species (e.g., CO<sub>2</sub>, H<sub>2</sub>S). However, in recent years there have been significant breakthroughs in satellite observations of passive volcanic SO<sub>2</sub> emissions, including high-resolution ultraviolet (UV) measurements from the Tropospheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursor (S5P) satellite, and the development of long-term records of volcanic SO<sub>2</sub> degassing from the Ozone Monitoring Instrument (OMI) on NASA’s Aura satellite. Satellite measurements offer some advantages over traditional gas monitoring techniques, e.g., synoptic coverage of large regions, relative immunity to variations in wind direction, and ability to map the spatial extent and dispersion of volcanic SO<sub>2</sub> plumes with applications for health hazard mitigation. Although these satellite datasets are potentially valuable for active volcano monitoring and as a supplement to other gas monitoring techniques, significant barriers remain to their use at many volcano observatories, particularly in low-income countries. Notably, the increasing volume of satellite datasets (NASA’s database is bigger than 3 petabytes) and the demands of data processing represent challenges to their operational use at observatories with limited internet connectivity or computational capacity. Here, we present an ongoing effort to develop open-source Python software to access and process SO<sub>2</sub> data directly through NASA’s Earthdata portal Application Processing Interface (API), in order to streamline the satellite SO<sub>2</sub> data processing workflow for a volcano observatory. By allowing server-side satellite data subsetting around the volcano of interest, this API greatly reduces the processing burden and only requires an internet connection to the NASA server hosting the required datasets (including S5P/TROPOMI, Aura/OMI and many others). We present some examples of software output and potential applications. Our current goal is to deploy and test the software for operational use in a volcano observatory.  </p>

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