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- DARCLOS: a cloud shadow detection algorithm for TROPOMI
Abstract: DARCLOS: a cloud shadow detection algorithm for TROPOMI
Victor J. H. Trees, Ping Wang, Piet Stammes, Lieuwe G. Tilstra, David P. Donovan, and A. Pier Siebesma
Atmos. Meas. Tech., 15, 3121–3140, https://doi.org/10.5194/amt-15-3121-2022, 2022
Cloud shadows are observed by the TROPOMI satellite instrument as a result of its high spatial resolution. These shadows contaminate TROPOMI's air quality measurements, because shadows are generally not taken into account in the models that are used for aerosol and trace gas retrievals. We present the Detection AlgoRithm for CLOud Shadows (DARCLOS) for TROPOMI, which is the first cloud shadow detection algorithm for a satellite spectrometer.
PubDate: 2022-05-19T21:02:50+02:00
- Technique for comparison of backscatter coefficients derived from in-situ
cloud probe measurements with concurrent airborne Lidar
Abstract: Technique for comparison of backscatter coefficients derived from in-situ cloud probe measurements with concurrent airborne Lidar
Shawn Wendell Wagner and David James Delene
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-87,2022
Preprint under review for AMT (discussion: open, 0 comments)
Jet engine power loss due to ice accumulation is a hazard that occurs in high-altitude clouds. A potential tool to inform pilots when entering such clouds is an onboard Lidar system. Lidar measurements are compared to backscatter coefficients derived from wing-mounted probes and are found to be in agreement for liquid clouds but disagreement for ice clouds. Total water content is correlated with the Lidar measurements, indicating it is useful for ice detection in a range of environments.
PubDate: 2022-05-19T21:02:50+02:00
- Comparison of OCO-2 target observations to MUCCnet – Is it possible to
capture urban XCO2 gradients from space'
Abstract: Comparison of OCO-2 target observations to MUCCnet – Is it possible to capture urban XCO2 gradients from space'
Maximilian Rißmann, Jia Chen, Gregory Osterman, Florian Dietrich, Moritz Makowski, Xinxu Zhao, Frank Hase, and Matthäus Kiel
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-71,2022
Preprint under review for AMT (discussion: open, 0 comments)
The Orbiting Carbon Observatory 2 (OCO-2) measures atmospheric concentrations of the most potent greenhouse gas CO2 globally. By comparing its measurements to a ground-based monitoring network in Munich (MUCCnet), we find that the satellite is able to reliably detect urban CO2 concentrations. Furthermore, spatial CO2 differences captured by OCO-2 and MUCCnet are strongly correlated, which indicates that OCO-2 could be helpful in determining urban CO2 emissions from space.
PubDate: 2022-05-19T21:02:50+02:00
- Boundary-layer height and surface stability at Hyytiälä,
Finland, in ERA5 and observations
Abstract: Boundary-layer height and surface stability at Hyytiälä, Finland, in ERA5 and observations
Victoria Anne Sinclair, Jenna Ritvanen, Gabin Urbancic, Irina Statnaia, Yurii Batrak, Dmitri Moisseev, and Mona Kurppa
Atmos. Meas. Tech., 15, 3075–3103, https://doi.org/10.5194/amt-15-3075-2022, 2022
We investigate the boundary-layer (BL) height and surface stability in southern Finland using radiosondes, a microwave radiometer and ERA5 reanalysis. Accurately quantifying the BL height is challenging, and the diagnosed BL height can depend strongly on the method used. Microwave radiometers provide reliable estimates of the BL height but only in unstable conditions. ERA5 captures the BL height well except under very stable conditions, which occur most commonly at night during the warm season.
PubDate: 2022-05-18T21:02:50+02:00
- Homogenization of the Observatoire de Haute Provence electrochemical
concentration cell (ECC) ozonesonde data record: comparison with lidar and
satellite observations
Abstract: Homogenization of the Observatoire de Haute Provence electrochemical concentration cell (ECC) ozonesonde data record: comparison with lidar and satellite observations
Gérard Ancellet, Sophie Godin-Beekmann, Herman G. J. Smit, Ryan M. Stauffer, Roeland Van Malderen, Renaud Bodichon, and Andrea Pazmiño
Atmos. Meas. Tech., 15, 3105–3120, https://doi.org/10.5194/amt-15-3105-2022, 2022
The 1991–2021 Observatoire de Haute Provence electrochemical concentration cell (ECC) ozonesonde data have been homogenized according to the recommendations of the Ozonesonde Data Quality Assessment panel. Comparisons with ground-based instruments also measuring ozone at the same station (lidar, surface measurements) and with colocated satellite observations show the benefits of this homogenization. Remaining differences between ECC and other observations in the stratosphere are also discussed.
PubDate: 2022-05-18T21:02:50+02:00
- Extended validation and evaluation of the OLCI-SLSTR Synergy aerosol
product (SY_2_AOD) on Sentinel-3
Abstract: Extended validation and evaluation of the OLCI-SLSTR Synergy aerosol product (SY_2_AOD) on Sentinel-3
Larisa Sogacheva, Matthieu Denisselle, Pekka Kolmonen, Timo H. Virtanen, Peter R. J. North, Claire Henocq, Silvia Scifoni, and Steffen Dransfeld
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-101,2022
Preprint under review for AMT (discussion: open, 0 comments)
The aim of this study was to provide global characterisation of a new SYNERGY aerosol product, derived from the data from the OLCI and SLSTR sensors onboard the Sentinel-3A and -3B satellites. Over ocean, the performance of SYNERGY retrieved AOD is good. Reduced performance over land was expected since the surface reflectance and angular distribution of scattering are more difficult to treat over land. Validation statistics are often slightly better for S3B and in the Southern Hemisphere.
PubDate: 2022-05-18T21:02:50+02:00
- Contrasting mineral dust abundances from X-ray diffraction and reflectance
spectroscopy
Abstract: Contrasting mineral dust abundances from X-ray diffraction and reflectance spectroscopy
Mohammad R. Sadrian, Wendy M. Calvin, and John McCormack
Atmos. Meas. Tech., 15, 3053–3074, https://doi.org/10.5194/amt-15-3053-2022, 2022
Mineral dust particles originate from surface soils, primarily in arid regions. They can stay suspended in the atmosphere, impacting Earth's radiation budget. Dust particles will have different perturbation effects depending on their composition. We obtained compositional information on dust collected in an urban setting using two different techniques. We recommended using the combination of measurements to determine the variability in dust mineral abundances.
PubDate: 2022-05-17T21:02:50+02:00
- Improving discrimination between clouds and optically thick aerosol plumes
in geostationary satellite data
Abstract: Improving discrimination between clouds and optically thick aerosol plumes in geostationary satellite data
Daniel Robbins, Caroline Poulsen, Steven Siems, and Simon Proud
Atmos. Meas. Tech., 15, 3031–3051, https://doi.org/10.5194/amt-15-3031-2022, 2022
A neural network (NN)-based cloud mask for a geostationary satellite instrument, AHI, is developed using collocated data and is better at not classifying thick aerosols as clouds versus the Japanese Meteorological Association and the Bureau of Meteorology masks, identifying 1.13 and 1.29 times as many non-cloud pixels than each mask, respectively. The improvement during the day likely comes from including the shortest wavelength bands from AHI in the NN mask, which the other masks do not use.
PubDate: 2022-05-17T21:02:50+02:00
- Can state-of-the-art infrared satellite sounders and reanalyses detect
moisture inversions in the Arctic'
Abstract: Can state-of-the-art infrared satellite sounders and reanalyses detect moisture inversions in the Arctic'
Giovanni Chellini and Kerstin Ebell
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-22,2022
Preprint under review for AMT (discussion: open, 0 comments)
Moisture inversions (MIs), i.e. atmospheric layers where specific humidity increases with height, are frequent in the Arctic. This study assesses the capability of two satellite instruments, IASI and AIRS, and one reanalysis, ERA5, to detect MIs at an Arctic site. The comparison with radiosonde data shows that humidity profiles from IASI and AIRS severely underestimate the occurrence of MIs. On the other hand, MI characteristics in ERA5 are comparable to those in the radiosonde data.
PubDate: 2022-05-17T21:02:50+02:00
- Performance comparison between electrochemical and semiconductors sensors
for the monitoring of O3
Abstract: Performance comparison between electrochemical and semiconductors sensors for the monitoring of O3
Christophe Claveau, Mathilde Giraudon, Benoit Coville, Arnaud Saussac, Laurence Eymard, Laure Turcati, and Sebastien Payan
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-75,2022
Preprint under review for AMT (discussion: open, 0 comments)
An individual mobile sensor is being developed within the LATMOS (Atmospheres Space Observations Laboratory) to contribute to answering problems related to the exposure of individuals to air pollution and their impact on health. Its adaptable and scalable nature allow the insertion of new "low cost" micro-sensors and to evaluate sensors performance. In this paper we present a laboratory evaluation of commercially micro-sensors for the monitoring of ozone (O3).
PubDate: 2022-05-17T21:02:50+02:00
- Observation error analysis for the WInd VElocity Radar Nephoscope W-band
Doppler conically scanning spaceborne radar via end-to-end simulations
Abstract: Observation error analysis for the WInd VElocity Radar Nephoscope W-band Doppler conically scanning spaceborne radar via end-to-end simulations
Alessandro Battaglia, Paolo Martire, Eric Caubet, Laurent Phalippou, Fabrizio Stesina, Pavlos Kollias, and Anthony Illingworth
Atmos. Meas. Tech., 15, 3011–3030, https://doi.org/10.5194/amt-15-3011-2022, 2022
We present an instrument simulator for a new sensor, WIVERN (WInd VElocity Radar Nephoscope), a conically scanning radar payload with Doppler capabilities, recently down-selected as one of the four candidates for the European Space Agency Earth Explorer 11 program. The mission aims at measuring horizontal winds in cloudy areas. The simulator is instrumental in the definition and consolidation of the mission requirements and the evaluation of mission performances.
PubDate: 2022-05-16T18:47:13+02:00
- Improved retrieval of SO2 plume height from TROPOMI using an iterative
Covariance-Based Retrieval Algorithm
Abstract: Improved retrieval of SO2 plume height from TROPOMI using an iterative Covariance-Based Retrieval Algorithm
Nicolas Theys, Christophe Lerot, Hugues Brenot, Jeroen van Gent, Isabelle De Smedt, Lieven Clarisse, Mike Burton, Matthew Varnam, and Michel Van Roozendael
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-148,2022
Preprint under review for AMT (discussion: open, 0 comments)
Sulfur dioxide plume height after a volcanic eruption is an important information for many different scientific studies and applications. Satellite UV retrievals are useful in this respect but available algorithms have shown so far limited sensitivity to SO2 height. Here we present a new technique to improve the retrieval of SO2 plume height for SO2 columns as low as 5 DU. We demonstrate the algorithm using TROPOMI measurements and compare with other height estimates.
PubDate: 2022-05-16T18:47:13+02:00
- Low-Cost Air Quality Sensor Evaluation and Calibration in Contrasting
Aerosol Environments
Abstract: Low-Cost Air Quality Sensor Evaluation and Calibration in Contrasting Aerosol Environments
Pawan Gupta, Prakash Doraiswamy, Jashwanth Reddy, Palak Balyan, Sagnik Dey, Ryan Chartier, Adeel Khan, Karmann Riter, Brandon Feenstra, Robert C. Levy, Nhu Nguyen Minh Tran, Olga Pikelnaya, Kurinji Selvaraj, Tanushree Ganguly, and Karthik Ganesan
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-140,2022
Preprint under review for AMT (discussion: open, 0 comments)
The use of low-cost sensors in air quality monitoring has been gaining interest across all walks of society. We present the results of evaluations of the PurpleAir against regulatory-grade PM2.5. The results indicate that with proper calibration, we can achieve bias-corrected PM2.5 data using PA sensors. Our study also suggests that pre-deployment calibrations developed at local or regional scales are required for the PA sensors to correct data from the field for scientific data analysis.
PubDate: 2022-05-16T18:47:13+02:00
- A New Hot-Stage Microscopy Technique for Measuring Temperature-Dependent
Viscosities of Aerosol Particles and its Application to Farnesene
Secondary Organic Aerosol
Abstract: A New Hot-Stage Microscopy Technique for Measuring Temperature-Dependent Viscosities of Aerosol Particles and its Application to Farnesene Secondary Organic Aerosol
Kristian J. Kiland, Kevin L. Marroquin, Natalie R. Smith, Shaun Xu, Sergey A. Nizkorodov, and Allan K. Bertram
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-151,2022
Preprint under review for AMT (discussion: open, 0 comments)
Information on the viscosity of secondary organic aerosols is needed when making air quality, climate, and atmospheric chemistry predictions. Viscosity depends on temperature, so we developed a new method for measuring the temperature-dependent viscosity of small samples. As an application of the method, we measured the viscosity of farnesene secondary organic aerosol at different temperatures.
PubDate: 2022-05-16T18:47:13+02:00
- Latent heating profiles from GOES-16 and its impacts on precipitation
forecasts
Abstract: Latent heating profiles from GOES-16 and its impacts on precipitation forecasts
Yoonjin Lee, Christian D. Kummerow, and Milija Zupanski
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-49,2022
Preprint under review for AMT (discussion: open, 0 comments)
Vertical profiles of latent heating are derived from Geostationary Operational Environmental Satellite-16 (GOES-16) to be used in convective initialization. They are compared with other radar products such as NEXRAD and GPM satellite, and the results show that their values are are very similar to radar derived products. Finally, using latent heating derived from GOES-16 in the forecast model shows significant improvements in precipitation forecast comparable to using heating from NEXRAD.
PubDate: 2022-05-16T18:47:13+02:00
- A comparison of carbon monoxide retrievals between the MOPITT satellite
and Canadian High-Arctic ground-based NDACC and TCCON FTIR measurements
Abstract: A comparison of carbon monoxide retrievals between the MOPITT satellite and Canadian High-Arctic ground-based NDACC and TCCON FTIR measurements
Ali Jalali, Kaley A. Walker, Kimberly Strong, Rebecca R. Buchholz, Merritt N. Deeter, Debra Wunch, Sébastien Roche, Tyler Wizenberg, Erik Lutsch, Erin McGee, Helen M. Worden, Pierre F. Fogal, and James R. Drummond
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-68,2022
Preprint under review for AMT (discussion: open, 0 comments)
This study validates MOPITT version 8 carbon monoxide measurements over the Canadian High Arctic for the period 2006 to 2019. The MOPITT products from different detector pixels and channels are compared with ground-based measurements from the Polar Environment Atmospheric Research Laboratory (PEARL) in Eureka, Nunavut, Canada. These results show good consistency between the satellite and ground-based measurements and provide guidance on the usage of these MOPITT data at high latitudes.
PubDate: 2022-05-16T18:47:13+02:00
- Comparison of Two Photolytic Calibration Methods for Nitrous Acid
Abstract: Comparison of Two Photolytic Calibration Methods for Nitrous Acid
Andrew Lindsay and Ezra Wood
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-157,2022
Preprint under review for AMT (discussion: open, 0 comments)
Nitrous acid (HONO) is an important source of the main atmospheric oxidant – the hydroxyl radical (OH). Advances in nitrous acid measurement techniques and calibration methods therefore improve our understanding of atmospheric oxidation processes. In this manuscript, we present two calibration methods based on photo-dissociating water vapor. These calibration methods are useful alternatives to conventional calibrations that involve a reacting hydrogen chloride vapor with sodium nitrite.
PubDate: 2022-05-16T18:47:13+02:00
- Performance analysis of the NanoScan SMPS and the Mini WRAS Ultrafine
Aerosol Particle Size Spectrometers
Abstract: Performance analysis of the NanoScan SMPS and the Mini WRAS Ultrafine Aerosol Particle Size Spectrometers
Ajit Ahlawat, Kay Weinhold, Jesus Marval, Paolo Tronville, Ari Leskinen, Mika Komppula, Holger Gerwig, Lars Gerling, Stephan Weber, Rikke Bramming Jørgensen, Thomas Nørregaard Jensen, Marouane Merizak, Ulrich Vogt, Carla Ribalta, Mar Viana, Andre Schmitz, Maria Chiesa, Giacomo Gerosa, Lothar Keck, Markus Pesch, Gerhard Steiner, Thomas Krinke, Torsten Tritscher, Wolfram Birmili, and Alfred Wiedensohler
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2022-155,2022
Preprint under review for AMT (discussion: open, 0 comments)
Measurements of ultrafine particles must be done with quality-assured instruments. The performance of portable instruments such as NanoScan SMPS, and GRIMM Mini WRAS spectrometer measuring the particle number size distribution in the range from 10 to 200 nm were investigated. The influence of different aerosol types and maintenance activities on these instruments were explored. The results show that these portable instruments are suitable for mobile UFP measurements for source identification.
PubDate: 2022-05-16T18:47:13+02:00
- Long-term behavior and stability of calibration models for NO and NO2
low-cost sensors
Abstract: Long-term behavior and stability of calibration models for NO and NO2 low-cost sensors
Horim Kim, Michael Müller, Stephan Henne, and Christoph Hüglin
Atmos. Meas. Tech., 15, 2979–2992, https://doi.org/10.5194/amt-15-2979-2022, 2022
In this study, the performance of electrochemical sensors for NO and NO2 for measuring air quality was determined over a longer operating period. The performance of NO sensors remained reliable for more than 18 months. However, the NO2 sensors showed decreasing performance over time. During deployment, we found that the NO2 sensors can distinguish general pollution levels, but they proved unsuitable for accurate measurements due to significant biases.
PubDate: 2022-05-13T23:05:56+02:00
- Intercomparison of holographic imaging and single-particle forward light
scattering in situ measurements of liquid clouds in changing atmospheric
conditions
Abstract: Intercomparison of holographic imaging and single-particle forward light scattering in situ measurements of liquid clouds in changing atmospheric conditions
Petri Tiitta, Ari Leskinen, Ville A. Kaikkonen, Eero O. Molkoselkä, Anssi J. Mäkynen, Jorma Joutsensaari, Silvia Calderon, Sami Romakkaniemi, and Mika Komppula
Atmos. Meas. Tech., 15, 2993–3009, https://doi.org/10.5194/amt-15-2993-2022, 2022
The novel holographic imaging instrument (ICEMET) was adapted to measure the microphysical properties of liquid clouds, and these values were compared with parallel measurements of a cloud droplet spectrometer (FM-120) and particle measurements using a twin-inlet system. When the intercomparison was carried out during isoaxial sampling, our results showed good agreement in terms of variability between the instruments. This agreement was confirmed using Mutual and Pearson correlation analyses.
PubDate: 2022-05-13T23:05:56+02:00
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