57 research outputs found
Replication Data for: Estimation of seasonal methane fluxes over a Mediterranean rice paddy area using the Radon Tracer Method (RTM)
No full textDatasets of:
-Methane and Radon concentration at DEC3 station
-Meteorological fields (WRF) modelled at the station
-Rn concentration modelled at the statio
Replication data for: Full characterization and calibration of a transfer standard monitor for atmospheric radon and thoron measurements
No full textThis dataset include all the data related to the publication "Full characterization and calibration of a transfer standard monitor for atmospheric radon measurements" of the AMT journal.
It includes the raw data obtained during the calibration of the ARMON at INTE Radon Chamber from October 2021, and also the R script to proceed them.
The data also includes the results from the COMSOL silmulation of the Electric field inside the ARMON's detection volume, and the result from the simulation of 10000 particles inside the detection volume when applying the simulated Electric field
Quantification of CH4 emissions from waste disposal sites near the city of Madrid using ground- and space-based observations of COCCON, TROPOMI and IASI
No full textThe objective of this study is to derive methane (CH4) emissions from three landfills, which are found to be the most significant CH4 sources in the metropolitan area of Madrid in Spain. We derive CH4 emissions from the CH4 enhancements observed by spaceborne and ground-based instruments. We apply satellite-based measurements from the TROPOspheric Monitoring Instrument (TROPOMI) and the Infrared Atmospheric Sounding Interferometer (IASI) together with measurements from the ground-based COllaborative Carbon Column Observing Network (COCCON) instruments. In 2018, a 2-week field campaign for measuring the atmospheric concentrations of greenhouse gases was performed in Madrid in the framework of Monitoring of the Greenhouse Gases Concentrations in Madrid (MEGEI-MAD) project. Five COCCON instruments were deployed at different locations around the Madrid city center, enabling the observation of total column-averaged CH4 mixing ratios (XCH4). Considering the prevalent wind regimes, we calculate the wind-assigned XCH4 anomalies for two opposite wind directions. Pronounced bipolar plumes are found when applying the method to NO2, which implies that our method of wind-assigned anomaly is suitable to estimate enhancements of trace gases at the urban level from satellite-based measurements. For quantifying the CH4 emissions, the wind-assigned plume method is applied to the TROPOMI XCH4 and to the lower tropospheric CH4¿¿dry-air column ratio (TXCH4) of the combined TROPOMI+IASI product.Peer ReviewedArticle signat per 28 Autors/es Qiansi Tu, Frank Hase, Matthias Schneider, Omaira García, Thomas Blumenstock,Tobias Borsdorff, Matthias Frey, Farahnaz Khosrawi, Alba Lorente, Carlos Alberti,Juan J. Bustos, André Butz, Virgilio Carreño, Emilio Cuevas, Roger Curcoll,Christopher J. Diekmann, Darko Dubravica, Benjamin Ert, Carme Estruch,Sergio Fabián León-Luis, Carlos Marrero, Josep-Anton Morgui, Ramón Ramos,Christian Scharun, Carsten Schneider, Eliezer Sepúlveda, Carlos Toledano, Carlos TorresObjectius de Desenvolupament Sostenible::13 - Acció per al ClimaPostprint (published version
High efficiency and portable monitor of atmospheric radon concentration activity for environmental applications
No full textMAR2EA Project:The project ‘High efficiency monitor of atmospheric radon concentration for radioprotection and environmental Applications’ (MAR2EA) funded by the Agència de Gestió d'Ajuts Universitaris i de Recerca (AGAUR) within the call: Knowledge Industry Grants for 2019 (Modality A: LLavor Grants, reference: 2019 LLAV 00035 / IU68-017047) aims to improve the Technology Readiness Levels (TRL) of a product designed at the Institute of Energy Technologies (INTE) of the Universitat Politècnica de Catalunya (UPC)Postprint (published version
Full characterization and calibration of a transfer standard monitor for atmospheric radon measurements
No full textIn this work, a full characterization of the new user-friendly version of the Atmospheric Radon MONitor (ARMON), used to measure very low activity concentrations of the radioactive radon gas in the outdoor atmosphere, is carried out. The ARMON is based on the electrostatic collection of 218Po+ particles on a semiconductor detector surface. A main advantage of this instrument is that it offers high-resolution alpha-energy spectra, which will allow us to separate radon progeny (210Po, 218Po, and 214Po). The monitor feature may also allow measurements of thoron (220Rn) by collection of 216Po+, although the instrument is not calibrated for this gas. In the paper, the physical principle; the hardware configuration; and the software development of the automatic and remotely controlled ARMON, conceived and constructed within the MAR2EA and the traceRadon projects, are described. The monitor efficiency and its linearity over a wide span of radon concentration activities have been evaluated and tested here using theoretical and experimental approaches. Finally, a complete budget analysis of the total uncertainty of the monitor was also achieved. Results from the application of a simplified theoretical approach show a detection efficiency for 218Po+ of about 0.0075¿(Bq¿m-3)-1¿s-1. The experimental approach, consisting of exposing the ARMON at controlled radon concentrations between a few hundreds to a few thousands of becquerels per cubic metre (Bq¿m-3), gives a detection efficiency for 218Po+ of 0.0057¿±¿0.0002¿(Bq¿m-3)¿s-1. This last value and its independence from the radon levels were also confirmed thanks to a new calibration method which allows us, using low-emanation sources, to obtain controlled radon levels of a few tens of becquerels per cubic metre (Bq¿m-3). The total uncertainty of the ARMON detection efficiency obtained for hourly radon concentrations above 5¿Bq¿m-3 was lower than 10¿% (k=¿1). The characteristic limits of the ARMON – being those dependent on the presence of thoron in the sampled air – were also calculated. A detection limit of 0.132¿Bq¿m-3 was estimated in the absence of thoron. At a typical thoron concentration at atmospheric sites of 0.017¿min-1, the detection limit was calculated to be 0.3¿Bq¿m-3, but this can be reduced if using a delay volume, obtaining a decision threshold of 0.0045¿Bq¿m-3. Current results may allow us to confirm that the ARMON is suitable to measure low-level radon activity concentrations (1–100¿Bq¿m-3) and to be used as a transfer standard to calibrate secondary atmospheric radon monitors.This research has been supported by the EU Horizon 2020 research and innovation programme (traceRadon project, grant no. 19ENV01) and the Agència de Gestió d'Ajuts Universitaris i de Recerca (MAR2EA; grant no. IU68-017047).Postprint (author's final draft
Atmospheric Carbon Dioxide variability at Aigüestortes, Central Pyrenees, Spain
No full textUnidad de excelencia María de Maeztu MdM-2015-0552In order to improve the understanding of the carbon cycle in the Pyrenean region, two atmospheric monitoring mountain stations were set up within the Long-Term Ecological Research node of Aigüestortes i Estany de Sant Maurici at Central Pyrenees, Spain. The atmospheric concentration of carbon dioxide (CO2) was measured over 2008-2014 and 2010-2014 at Estany Llong (ELL) site and Centre de Recerca d'Alta Muntanya (CRAM), respectively. Measurements were carried out fortnightly off-line with high precision instrumentation at ELL and every minute online with a lower precision sensor at CRAM in conjunction with meteorological variables. The two datasets were analyzed in this study, quantifying whenever possible annual growth rates (AGR), seasonal variability, and diurnal amplitudes. Results were also compared with the NOAA Marine Boundary Layer (MBL) reference product and CO2 data from other background monitoring stations. Four-harmonics adjusted CO2 data from ELL showed a high correlation with the NOAA MBL reference product for the same latitude (Spearman's rho ρ = 0.96). In addition, AGRs of CO2 at ELL correlated well with those observed at Mace Head (MHD) station (ρ = 0.94), suggesting that ELL can be considered a background station. Winter CRAM CO2 data was not statistically different from ELL data, while in summer, it was 5.5 ppm lower on average, suggesting a higher photosynthesis uptake. The amplitude of the CO2 diurnal cycle at CRAM was found to be exponentially related to the local mean daily temperature and dependent on forthcoming wind sector (N-NW or E-SE-S-SW). An increase in CRAM CO2 concentrations was observed under N-NW winds during daytime, which could be related to traffic emissions. This study demonstrates that the use of CO2 sensors with low precision but continuously corrected and periodically calibrated can be used for the study of local and regional CO2 sources and sinks
Atmospheric Carbon Dioxide variability at Aigüestortes, Central Pyrenees, Spain
No full textPeer Reviewe
Revisiting the role of environmental and climate factors on the epidemiology of Kawasaki disease
No full textMetrology for low-cost CO2 sensors applications: the case of a steady-state through-flow (SS-TF) chamber for CO2 fluxes observations
No full textSoil CO2 emissions are one of the largest contributions to the global carbon cycle, and a full understanding of processes generating them and how climate change may modify them is needed and still uncertain. Thus, a dense spatial and temporal network of CO2 flux measurements from soil could help reduce uncertainty in the global carbon budgets. In the present study, the design, assembly, and calibration of low-cost air enquirer kits, including CO2 and environmental parameters sensors, is presented. Different types of calibrations for the CO2 sensors and their associated errors are calculated. In addition, for the first time, this type of sensor has been applied to design, develop, and test a new steady-state through-flow (SS-TF) chamber for simultaneous measurements of CO2 fluxes in soil and CO2 concentrations in air. The sensors’ responses were corrected for temperature, relative humidity, and pressure conditions in order to reduce the uncertainty in the measured CO2 values and of the following calculated CO2 fluxes based on SS-TF. CO2 soil fluxes measured by the proposed SS-TF and by a standard closed non-steady-state non-through-flow (NSS-NTF) chamber were briefly compared to ensure the reliability of the results. The use of a multiparametric fitting reduced the total uncertainty of the CO2 concentration measurements by 62 %, compared with the uncertainty that occurred when a simple CO2 calibration was applied, and by 90 %, when compared to the uncertainty declared by the manufacturer. The new SSTF system allows the continuous measurement of CO2 fluxes and CO2 ambient air with low cost (EUR ~ 1200), low energy demand (< 5 W), and low maintenance (twice per year due to sensor calibration requirements).Peer ReviewedPostprint (published version
Atmospheric Carbon Dioxide variability at Aigüestortes, Central Pyrenees, Spain
No full textPeer ReviewedPostprint (author's final draft
- …
