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Atmospheric Measurement Techniques Discussions (AMTD)
Number of Followers: 10  

  This is an Open Access Journal Open Access journal
ISSN (Online) 1867-8610
Published by Copernicus Publications Homepage  [54 journals]
  • Development and Evaluation of an Improved Off-Line Aerosol Mass
           Spectrometry Technique

    • Abstract: Development and Evaluation of an Improved Off-Line Aerosol Mass Spectrometry Technique
      Christina N. Vasilakopoulou, Kalliopi Florou, Christos Kaltsonoudis, Iasonas Stavroulas, Nikolaos Mihalopoulos, and Spyros N. Pandis
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2023-16,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      The off-line Aerosol Mass Spectrometry (AMS) technique is a useful tool for the source apportionment of organic aerosol in areas and periods during which an AMS is not available. In this work an improved off-line technique was developed and evaluated in an effort to capture most of the partially soluble and insoluble organic aerosol material, reducing significantly the uncertainty of the corresponding source apportionment.
      PubDate: Mon, 06 Feb 2023 09:56:23 +010
      DOI: 10.5194/amt-2023-162023

       
  • High-spatial-resolution retrieval of cloud droplet size distribution from
           polarized observations of the cloudbow

    • Abstract: High-spatial-resolution retrieval of cloud droplet size distribution from polarized observations of the cloudbow
      Veronika Pörtge, Tobias Kölling, Anna Weber, Lea Volkmer, Claudia Emde, Tobias Zinner, Linda Forster, and Bernhard Mayer
      Atmos. Meas. Tech., 16, 645–667, https://doi.org/10.5194/amt-16-645-2023, 2023
      In this work, we analyze polarized cloudbow observations by the airborne camera system specMACS to retrieve the cloud droplet size distribution defined by the effective radius (reff) and the effective variance (veff). Two case studies of trade-wind cumulus clouds observed during the EUREC4A field campaign are presented. The results are combined into maps of reff and veff with a very high spatial resolution (100 m × 100 m) that allow new insights into cloud microphysics.
      PubDate: Fri, 03 Feb 2023 09:56:23 +010
      DOI: 10.5194/amt-16-645-2023 2023

       
  • Advances in retrieving XCH4 and XCO from Sentinel-5 Precursor:
           improvements in the scientific TROPOMI/WFMD algorithm

    • Abstract: Advances in retrieving XCH4 and XCO from Sentinel-5 Precursor: improvements in the scientific TROPOMI/WFMD algorithm
      Oliver Schneising, Michael Buchwitz, Jonas Hachmeister, Steffen Vanselow, Maximilian Reuter, Matthias Buschmann, Heinrich Bovensmann, and John P. Burrows
      Atmos. Meas. Tech., 16, 669–694, https://doi.org/10.5194/amt-16-669-2023, 2023
      Methane and carbon monoxide are important constituents of the atmosphere in the context of climate change and air pollution. We present the latest advances in the TROPOMI/WFMD algorithm to simultaneously retrieve atmospheric methane and carbon monoxide abundances from space. The changes in the latest product version are described in detail, and the resulting improvements are demonstrated. An overview of the products is provided including a discussion of annual increases and validation results.
      PubDate: Fri, 03 Feb 2023 09:56:23 +010
      DOI: 10.5194/amt-16-669-2023 2023

       
  • Highly resolved mapping of NO2 vertical column densities from GeoTASO
           measurements over a megacity and industrial area during the KORUS-AQ
           campaign

    • Abstract: Highly resolved mapping of NO2 vertical column densities from GeoTASO measurements over a megacity and industrial area during the KORUS-AQ campaign
      Gyo-Hwang Choo, Kyunghwa Lee, Hyunkee Hong, Ukkyo Jeong, Wonei Choi, and Scott J. Janz
      Atmos. Meas. Tech., 16, 625–644, https://doi.org/10.5194/amt-16-625-2023, 2023
      This study discusses the morning and afternoon distribution of NO2 emissions in large cities and industrial areas in South Korea, one of the largest NO2 emitters around the world, using GeoTASO, an airborne remote sensing instrument developed to support geostationary satellite missions. NO2 measurements from GeoTASO were compared with those from ground-based remote sensing instruments including Pandora and in situ sensors.
      PubDate: Fri, 03 Feb 2023 07:36:09 +010
      DOI: 10.5194/amt-16-625-2023 2023

       
  • Particle Inertia Effects on Radar Doppler Spectra Simulation

    • Abstract: Particle Inertia Effects on Radar Doppler Spectra Simulation
      Zeen Zhu, Pavlos Kollias, and Fan Yang
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2023-13,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      We show that big liquid droplets, with large inertia, are unable to follow the rapid change of velocity field in a turbulent environment. A lack of consideration of this inertia effect leads to an unrealistic broadening of the simulated radar Doppler spectrum. Based on the physics-based simulation, we propose a new simulator that can generate more consistent radar Doppler spectra compared with observation, providing a valuable tool to decode the cloud microphysics and dynamics properties.
      PubDate: Wed, 01 Feb 2023 07:36:09 +010
      DOI: 10.5194/amt-2023-132023

       
  • Evaluation of the spectral misalignment on the Earth Clouds, Aerosols and
           Radiation Explorer/multi-spectral imager cloud product

    • Abstract: Evaluation of the spectral misalignment on the Earth Clouds, Aerosols and Radiation Explorer/multi-spectral imager cloud product
      Minrui Wang, Takashi Y. Nakajima, Woosub Roh, Masaki Satoh, Kentaroh Suzuki, Takuji Kubota, and Mayumi Yoshida
      Atmos. Meas. Tech., 16, 603–623, https://doi.org/10.5194/amt-16-603-2023, 2023
      SMILE (a spectral misalignment in which a shift in the center wavelength appears as a distortion in the spectral image) was detected during our recent work. To evaluate how it affects the cloud retrieval products, we did a simulation of EarthCARE-MSI forward radiation, evaluating the error in simulated scenes from a global cloud system-resolving model and a satellite simulator. Our results indicated that the error from SMILE was generally small and negligible for oceanic scenes.
      PubDate: Tue, 31 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-16-603-2023 2023

       
  • Validation of NH3 observations from AIRS and CrIS against aircraft
           measurements from DISCOVER-AQ and a surface network in the Magic Valley

    • Abstract: Validation of NH3 observations from AIRS and CrIS against aircraft measurements from DISCOVER-AQ and a surface network in the Magic Valley
      Karen Elena Cady-Pereira, Xuehui Guo, Rui Wang, April Leytem, Chase Calkins, Elizabeth Berry, Kang Sun, Markus Müller, Armin Wisthaler, Vivienne H. Payne, Mark W. Shephard, Mark A. Zondlo, and Valentin H. Kantchev
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2022-336,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      Ammonia is a significant precursor of PM2.5 particles and thus contributes to poor air quality in many regions. Furthermore, ammonia concentrations are rising due to the increase of large scale, intensive agricultural activities. Here we evaluate satellite measurements of ammonia against aircraft and surface network data, and show that there are significant differences, which can be explained mainly by different vertical and horizontal sampling scales.
      PubDate: Tue, 31 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-2022-3362023

       
  • Multiwavelength fluorescence lidar observations of fresh smoke plumes

    • Abstract: Multiwavelength fluorescence lidar observations of fresh smoke plumes
      Igor Veselovskii, Nikita Kasianik, Mikhail Korenskii, Qiaoyun Hu, Philippe Goloub, Thierry Podvin, and Dong Liu
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2023-5,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      A five-channel fluorescence lidar was developed for the study of atmospheric aerosol. The fluorescence spectrum induced by 355 nm laser emission is analyzed in five spectral intervals: 438/29, 472/32, 513/29, 560/40 and 614/54 nm. This idar system was operated during strong forest fires. Our results demonstrate that, for urban aerosol, the maximal fluorescence backscattering is observed at 472 nm, while for smoke the spectrum is shifted toward longer wavelengths.
      PubDate: Tue, 31 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-2023-52023

       
  • A compact formulation for the retrieval of the overlap function in an
           elastic/Raman aerosol lidar

    • Abstract: A compact formulation for the retrieval of the overlap function in an elastic/Raman aerosol lidar
      Adolfo Comerón, Constantino Muñoz-Porcar, Alejandro Rodríguez-Gómez, Michaël Sicard, Federico Dios, Cristina Gil-Díaz, Daniel Camilo Fortunato dos Santos Oliveira, and Francesc Rocadenbosch
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2022-333,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      In this paper, an explicit formula for recovering the overlap function of an aerosol lidar system is presented. It makes use of the elastic and Raman channels of the lidar. Some considerations are made about assumptions made on lidar ratio value. Results are presented for two measurements.
      PubDate: Tue, 31 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-2022-3332023

       
  • Theoretical assessment of the ability of the MicroCarb satellite city-scan
           observing mode to estimate urban CO2 emissions

    • Abstract: Theoretical assessment of the ability of the MicroCarb satellite city-scan observing mode to estimate urban CO2 emissions
      Kai Wu, Paul I. Palmer, Dien Wu, Denis Jouglet, Liang Feng, and Tom Oda
      Atmos. Meas. Tech., 16, 581–602, https://doi.org/10.5194/amt-16-581-2023, 2023
      We evaluate the theoretical ability of the upcoming MicroCarb satellite to estimate urban CO2 emissions over Paris and London. We explore the relative performance of alternative two-sweep and three-sweep city observing modes and take into account the impacts of cloud cover and urban biological CO2 fluxes. Our results find both the two-sweep and three-sweep observing modes are able to reduce prior flux errors by 20 %–40 % depending on the prevailing wind direction and cloud coverage.
      PubDate: Mon, 30 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-16-581-2023 2023

       
  • Estimates of the spatially complete, observational-data-driven planetary
           boundary layer height over the contiguous United States

    • Abstract: Estimates of the spatially complete, observational-data-driven planetary boundary layer height over the contiguous United States
      Zolal Ayazpour, Shiqi Tao, Dan Li, Amy Jo Scarino, Ralph E. Kuehn, and Kang Sun
      Atmos. Meas. Tech., 16, 563–580, https://doi.org/10.5194/amt-16-563-2023, 2023
      Accurate knowledge of the planetary boundary layer height (PBLH) is essential to study air pollution. However, PBLH observations are sparse in space and time, and PBLHs used in atmospheric models are often inaccurate. Using PBLH observations from the Aircraft Meteorological DAta Relay (AMDAR), we present a machine learning framework to produce a spatially complete PBLH product over the contiguous US that shows a better agreement with reference PBLH observations than commonly used PBLH products.
      PubDate: Mon, 30 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-16-563-2023 2023

       
  • In situ ground-based mobile measurement of lightning events above central
           Europe

    • Abstract: In situ ground-based mobile measurement of lightning events above central Europe
      Jakub Kákona, Jan Mikeš, Iva Ambrožová, Ondřej Ploc, Olena Velychko, Lembit Sihver, and Martin Kákona
      Atmos. Meas. Tech., 16, 547–561, https://doi.org/10.5194/amt-16-547-2023, 2023
      Storm activity is sometimes associated with the generation of ionizing radiation. Our motivation for performing this research was to understand its origin. Using measuring cars fitted with new instruments, it was found that the duration of lightning is longer than generally thought. In most cases, lightning occurs only inside the cloud; however, rarely, it is also visible outside the cloud. In such cases, the course of emission over time can be used to assume what it looks like inside the cloud.
      PubDate: Mon, 30 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-16-547-2023 2023

       
  • Validation of the Cloud_CCI cloud products in the Arctic

    • Abstract: Validation of the Cloud_CCI cloud products in the Arctic
      Kameswara S. Vinjamuri, Marco Vountas, Luca Lelli, Martin Stengel, Matthew D. Shupe, Kerstin Ebell, and John P. Burrows
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2022-312,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      Clouds play an important role in the Arctic climate change. Cloud data from ground-based sites are valuable but cannot represent the whole Arctic. Therefore the use of satellite products is a measure to cover the entire Arctic. However, the quality of such clouds measurements from space is not well known. The paper discusses the differences and commonalities between both space & ground-based measurements. We conclude that the satellite dataset, with few exceptions, can be used in the Arctic.
      PubDate: Mon, 30 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-2022-3122023

       
  • Optimal estimation retrieval of tropospheric ammonia from the
           Geostationary Interferometric Infrared Sounder onboard FengYun-4B

    • Abstract: Optimal estimation retrieval of tropospheric ammonia from the Geostationary Interferometric Infrared Sounder onboard FengYun-4B
      Zhao-Cheng Zeng, Lu Lee, and Chengli Qi
      Atmos. Meas. Tech. Discuss., https//doi.org/10.5194/amt-2023-12,2023
      Preprint under review for AMT (discussion: open, 0 comments)
      This study presents an NH3 retrieval algorithm based on the optimal estimation method for the Geostationary Interferometric Infrared Sounder (GIIRS) onboard China’s FengYun-4B satellite. Retrieval results demonstrate the capability of FY-4B/GIIRS in capturing the diurnal NH3 changes in East Asia. This operational geostationary observation by FY-4B/GIIRS represents an important advancement over the twice-per-day observations provided by current LEO instruments.
      PubDate: Mon, 30 Jan 2023 09:59:45 +010
      DOI: 10.5194/amt-2023-122023

       
  • Field comparison of two novel open-path instruments that measure dry
           deposition and emission of ammonia using flux-gradient and eddy covariance
           methods

    • Abstract: Field comparison of two novel open-path instruments that measure dry deposition and emission of ammonia using flux-gradient and eddy covariance methods
      Daan Swart, Jun Zhang, Shelley van der Graaf, Susanna Rutledge-Jonker, Arjan Hensen, Stijn Berkhout, Pascal Wintjen, René van der Hoff, Marty Haaima, Arnoud Frumau, Pim van den Bulk, Ruben Schulte, Margreet van Zanten, and Thomas van Goethem
      Atmos. Meas. Tech., 16, 529–546, https://doi.org/10.5194/amt-16-529-2023, 2023
      During a 5-week comparison campaign, we tested two set-ups to measure half hourly ammonia fluxes. The eddy covariance and flux gradient systems showed very similar results when the upwind terrain was both homogeneous and free of obstacles. We discuss the technical performance and practical limitations of both systems. Measurements from these instruments can facilitate the study of processes behind ammonia deposition, an important contributor to eutrophication and acidificationin natural areas.
      PubDate: Fri, 27 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-529-2023 2023

       
  • UAV-based sampling systems to analyse greenhouse gases and volatile
           organic compounds encompassing compound-specific stable isotope analysis

    • Abstract: UAV-based sampling systems to analyse greenhouse gases and volatile organic compounds encompassing compound-specific stable isotope analysis
      Simon Leitner, Wendelin Feichtinger, Stefan Mayer, Florian Mayer, Dustin Krompetz, Rebecca Hood-Nowotny, and Andrea Watzinger
      Atmos. Meas. Tech., 16, 513–527, https://doi.org/10.5194/amt-16-513-2023, 2023
      An increased social environmental awareness requires the monitoring of greenhouse gases (GHGs). We report on the development of two sampling devices (which can be mounted to a drone) and the subsequent measurement setup to analyse these gases. The functionality of the presented system was tested in the field, and the results emphasised the functionality of the sampling and measurement setup, demonstrating that it is a viable tool for monitoring GHGs and identifying their emission sources.
      PubDate: Fri, 27 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-513-2023 2023

       
  • Atmospheric boundary layer height from ground-based remote sensing: a
           review of capabilities and limitations

    • Abstract: Atmospheric boundary layer height from ground-based remote sensing: a review of capabilities and limitations
      Simone Kotthaus, Juan Antonio Bravo-Aranda, Martine Collaud Coen, Juan Luis Guerrero-Rascado, Maria João Costa, Domenico Cimini, Ewan J. O'Connor, Maxime Hervo, Lucas Alados-Arboledas, María Jiménez-Portaz, Lucia Mona, Dominique Ruffieux, Anthony Illingworth, and Martial Haeffelin
      Atmos. Meas. Tech., 16, 433–479, https://doi.org/10.5194/amt-16-433-2023, 2023
      Profile observations of the atmospheric boundary layer now allow for layer heights and characteristics to be derived at high temporal and vertical resolution. With novel high-density ground-based remote-sensing measurement networks emerging, horizontal information content is also increasing. This review summarises the capabilities and limitations of various sensors and retrieval algorithms which need to be considered during the harmonisation of data products for high-impact applications.
      PubDate: Thu, 26 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-433-2023 2023

       
  • Use of machine learning and principal component analysis to retrieve
           nitrogen dioxide (NO2) with hyperspectral imagers and reduce noise in
           spectral fitting

    • Abstract: Use of machine learning and principal component analysis to retrieve nitrogen dioxide (NO2) with hyperspectral imagers and reduce noise in spectral fitting
      Joanna Joiner, Sergey Marchenko, Zachary Fasnacht, Lok Lamsal, Can Li, Alexander Vasilkov, and Nickolay Krotkov
      Atmos. Meas. Tech., 16, 481–500, https://doi.org/10.5194/amt-16-481-2023, 2023
      Nitrogen dioxide (NO2) is an important trace gas for both air quality and climate. NO2 affects satellite ocean color products. A new ocean color instrument – OCI (Ocean Color Instrument) – will be launched in 2024 on a NASA satellite. We show that it will be possible to measure NO2 from OCI even though it was not designed for this. The techniques developed here, based on machine learning, can also be applied to instruments already in space to speed up algorithms and reduce the effects of noise.
      PubDate: Thu, 26 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-481-2023 2023

       
  • Development of multi-channel whole-air sampling equipment onboard an
           unmanned aerial vehicle for investigating volatile organic compounds'
           vertical distribution in the planetary boundary layer

    • Abstract: Development of multi-channel whole-air sampling equipment onboard an unmanned aerial vehicle for investigating volatile organic compounds' vertical distribution in the planetary boundary layer
      Suding Yang, Xin Li, Limin Zeng, Xuena Yu, Ying Liu, Sihua Lu, Xiaofeng Huang, Dongmei Zhang, Haibin Xu, Shuchen Lin, Hefan Liu, Miao Feng, Danlin Song, Qinwen Tan, Jinhui Cui, Lifan Wang, Ying Chen, Wenjie Wang, Haijiong Sun, Mengdi Song, Liuwei Kong, Yi Liu, Linhui Wei, Xianwu Zhu, and Yuanhang Zhang
      Atmos. Meas. Tech., 16, 501–512, https://doi.org/10.5194/amt-16-501-2023, 2023
      Vertical observation of volatile organic compounds (VOCs) is essential to study the spatial distribution and evolution patterns of VOCs in the planetary boundary layer (PBL). This paper describes multi-channel whole-air sampling equipment onboard an unmanned aerial vehicle (UAV) for near-continuous VOC vertical observation. Vertical profiles of VOCs and trace gases during the evolution of the PBL in south-western China have been successfully obtained by deploying the newly developed UAV system.
      PubDate: Thu, 26 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-501-2023 2023

       
  • A study of optical scattering modelling for mixed-phase polar
           stratospheric clouds

    • Abstract: A study of optical scattering modelling for mixed-phase polar stratospheric clouds
      Francesco Cairo, Terry Deshler, Luca Di Liberto, Andrea Scoccione, and Marcel Snels
      Atmos. Meas. Tech., 16, 419–431, https://doi.org/10.5194/amt-16-419-2023, 2023
      The T-matrix theory was used to compute the backscatter and depolarization of mixed-phase PSC, assuming that particles are solid (NAT or possibly ice) above a threshold radius R and liquid (STS) below, and a single shape is common to all solid particles. We used a dataset of coincident lidar and balloon-borne backscattersonde and OPC measurements. The agreement between modelled and measured backscatter is reasonable and allows us to constrain the parameters R and AR.
      PubDate: Thu, 26 Jan 2023 21:54:37 +010
      DOI: 10.5194/amt-16-419-2023 2023

       
 
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