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@@ -0,0 +1,271 @@
+
+
+
+ 20240620141848-ddca0188f23e5c692e95bf52f5a8a554795cb77d
+ 20240620141848
+
+ JOSS Admin
+ admin@theoj.org
+
+ The Open Journal
+
+
+
+
+ Journal of Open Source Software
+ JOSS
+ 2475-9066
+
+ 10.21105/joss
+ https://joss.theoj.org
+
+
+
+
+ 06
+ 2024
+
+
+ 9
+
+ 98
+
+
+
+ MWRpy: A Python package for processing microwave
+radiometer data
+
+
+
+ Tobias
+ Marke
+ https://orcid.org/0000-0001-7804-9056
+
+
+ Ulrich
+ Löhnert
+ https://orcid.org/0000-0002-9023-0269
+
+
+ Simo
+ Tukiainen
+ https://orcid.org/0000-0002-0651-4622
+
+
+ Tuomas
+ Siipola
+ https://orcid.org/0009-0004-7757-0893
+
+
+ Bernhard
+ Pospichal
+ https://orcid.org/0000-0001-9517-8300
+
+
+
+ 06
+ 20
+ 2024
+
+
+ 6733
+
+
+ 10.21105/joss.06733
+
+
+ http://creativecommons.org/licenses/by/4.0/
+ http://creativecommons.org/licenses/by/4.0/
+ http://creativecommons.org/licenses/by/4.0/
+
+
+
+ Software archive
+ 10.5281/zenodo.11614185
+
+
+ GitHub review issue
+ https://github.com/openjournals/joss-reviews/issues/6733
+
+
+
+ 10.21105/joss.06733
+ https://joss.theoj.org/papers/10.21105/joss.06733
+
+
+ https://joss.theoj.org/papers/10.21105/joss.06733.pdf
+
+
+
+
+
+ Ground-based microwave radiometer
+reprocessing mwr_pro
+ Löhnert
+ 10.5281/zenodo.7973553
+ 2023
+ Löhnert, U. (2023). Ground-based
+microwave radiometer reprocessing mwr_pro (Version v04). Zenodo.
+https://doi.org/10.5281/zenodo.7973553
+
+
+ Cloudnet: Continuous evaluation of cloud
+profiles in seven operational models using ground-based
+observations
+ Illingworth
+ Bulletin of the American Meteorological
+Society
+ 6
+ 88
+ 10.1175/BAMS-88-6-883
+ 2007
+ Illingworth, A. J., & Coauthors.
+(2007). Cloudnet: Continuous evaluation of cloud profiles in seven
+operational models using ground-based observations. Bulletin of the
+American Meteorological Society, 88(6), 883–898.
+https://doi.org/10.1175/BAMS-88-6-883
+
+
+ Aerosol, Clouds and Trace Gases Research
+Infrastructure – ACTRIS, the European research infrastructure supporting
+atmospheric science
+ Laj
+ Bulletin of the American Meteorological
+Society
+ 10.1175/BAMS-D-23-0064.1
+ 2024
+ Laj, P., & Coauthors. (2024).
+Aerosol, Clouds and Trace Gases Research Infrastructure – ACTRIS, the
+European research infrastructure supporting atmospheric science.
+Bulletin of the American Meteorological Society.
+https://doi.org/10.1175/BAMS-D-23-0064.1
+
+
+ CloudnetPy: A Python package for processing
+cloud remote sensing data
+ Tukiainen
+ Journal of Open Source
+Software
+ 53
+ 5
+ 10.21105/joss.02123
+ 2020
+ Tukiainen, S., O’Connor, E., &
+Korpinen, A. (2020). CloudnetPy: A Python package for processing cloud
+remote sensing data. Journal of Open Source Software, 5(53), 2123.
+https://doi.org/10.21105/joss.02123
+
+
+ A review of surface-based microwave and
+millimeter-wave radiometric remote sensing of the
+troposphere
+ Westwater
+ URSI Radio Science Bulletin
+ 310
+ 2004
+ 10.23919/URSIRSB.2004.7909438
+ 2004
+ Westwater, E. R., Crewell, S., &
+Mätzler, C. (2004). A review of surface-based microwave and
+millimeter-wave radiometric remote sensing of the troposphere. URSI
+Radio Science Bulletin, 2004(310), 59–80.
+https://doi.org/10.23919/URSIRSB.2004.7909438
+
+
+ EUMETNET opens to microwave radiometers for
+operational thermodynamical profiling in Europe
+ Rüfenacht
+ Bulletin of Atmospheric Science and
+Technology
+ 4
+ 2
+ 10.1007/s42865-021-00033-w
+ 2021
+ Rüfenacht, R., Haefele, A.,
+Pospichal, B., Cimini, D., Bircher-Adrot, S., Turp, M., & Sugier, J.
+(2021). EUMETNET opens to microwave radiometers for operational
+thermodynamical profiling in Europe. Bulletin of Atmospheric Science and
+Technology, 2(4).
+https://doi.org/10.1007/s42865-021-00033-w
+
+
+ Accuracy of boundary layer temperature
+profiles retrieved with multifrequency multiangle microwave
+radiometry
+ Crewell
+ IEEE Transactions on Geoscience and Remote
+Sensing
+ 7
+ 45
+ 10.1109/TGRS.2006.888434
+ 2007
+ Crewell, S., & Löhnert, U.
+(2007). Accuracy of boundary layer temperature profiles retrieved with
+multifrequency multiangle microwave radiometry. IEEE Transactions on
+Geoscience and Remote Sensing, 45(7), 2195–2201.
+https://doi.org/10.1109/TGRS.2006.888434
+
+
+ Accuracy of cloud liquid water path from
+ground-based microwave radiometry 2. Sensor accuracy and
+synergy
+ Crewell
+ Radio Science
+ 3
+ 38
+ 10.1029/2002RS002634
+ 2003
+ Crewell, S., & Löhnert, U.
+(2003). Accuracy of cloud liquid water path from ground-based microwave
+radiometry 2. Sensor accuracy and synergy. Radio Science, 38(3).
+https://doi.org/10.1029/2002RS002634
+
+
+ Operational profiling of temperature using
+ground-based microwave radiometry at Payerne: Prospects and
+challenges
+ Löhnert
+ Atmospheric Measurement
+Techniques
+ 5
+ 5
+ 10.5194/amt-5-1121-2012
+ 2012
+ Löhnert, U., & Maier, O. (2012).
+Operational profiling of temperature using ground-based microwave
+radiometry at Payerne: Prospects and challenges. Atmospheric Measurement
+Techniques, 5(5), 1121–1134.
+https://doi.org/10.5194/amt-5-1121-2012
+
+
+ PyRTlib: An educational Python-based library
+for non-scattering atmospheric microwave radiative transfer
+computations
+ Larosa
+ Geoscientific Model
+Development
+ 5
+ 17
+ 10.5194/gmd-17-2053-2024
+ 2024
+ Larosa, S., Cimini, D., Gallucci, D.,
+Nilo, S. T., & Romano, F. (2024). PyRTlib: An educational
+Python-based library for non-scattering atmospheric microwave radiative
+transfer computations. Geoscientific Model Development, 17(5),
+2053–2076.
+https://doi.org/10.5194/gmd-17-2053-2024
+
+
+
+
+
+
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+
+
+
+
+
+
+
+Journal of Open Source Software
+JOSS
+
+2475-9066
+
+Open Journals
+
+
+
+6733
+10.21105/joss.06733
+
+MWRpy: A Python package for processing microwave
+radiometer data
+
+
+
+https://orcid.org/0000-0001-7804-9056
+
+Marke
+Tobias
+
+
+*
+
+
+https://orcid.org/0000-0002-9023-0269
+
+Löhnert
+Ulrich
+
+
+
+
+https://orcid.org/0000-0002-0651-4622
+
+Tukiainen
+Simo
+
+
+
+
+https://orcid.org/0009-0004-7757-0893
+
+Siipola
+Tuomas
+
+
+
+
+https://orcid.org/0000-0001-9517-8300
+
+Pospichal
+Bernhard
+
+
+
+
+
+Institute for Geophysics and Meteorology, University of
+Cologne, Germany
+
+
+
+
+Finnish Meteorological Institute, Helsinki,
+Finland
+
+
+
+
+* E-mail:
+
+
+21
+2
+2024
+
+9
+98
+6733
+
+Authors of papers retain copyright and release the
+work under a Creative Commons Attribution 4.0 International License (CC
+BY 4.0)
+2022
+The article authors
+
+Authors of papers retain copyright and release the work under
+a Creative Commons Attribution 4.0 International License (CC BY
+4.0)
+
+
+
+Python
+meteorology
+remote sensing
+microwave radiometer
+
+
+
+
+
+ Summary
+
Ground-based passive microwave radiometers (MWRs) are deployed to
+ obtain information on the vertical structure of temperature and water
+ vapor mostly in the lower troposphere. In addition, they are used to
+ derive the total column-integrated liquid water content of the
+ atmosphere, referred to as liquid water path (LWP). MWRs measure
+ radiances, given as brightness temperatures
+ (
+
+ TB),
+ typically in two frequency ranges along absorption features of water
+ vapor and oxygen, as well as in window regions where the observations
+ are sensitive to liquid water clouds. Profiles of temperature and
+ humidity are retrieved together with the vertically integrated water
+ vapor content (IWV) and LWP (e.g., Crewell & Löhnert
+ (2003),
+ Löhnert & Maier
+ (2012)).
+ A specific elevation scanning configuration allows for an improved
+ resolution for temperature profiles in the atmospheric boundary-layer
+ (Crewell
+ & Löhnert, 2007). The instruments can be operated
+ continuously and provide temporally highly resolved observations of up
+ to 1
+
+ s,
+ which makes them a valuable tool for improving numerical weather
+ forecasts and climate models by studying the atmospheric water cycle,
+ including cloud dynamics
+ (Westwater
+ et al., 2004).
+
One widely used application exploiting MWR data is the synergistic
+ algorithm Cloudnet
+ (Illingworth
+ & Coauthors, 2007), which classifies hydrometeors in the
+ atmosphere by combining several ground-based remote sensing
+ instruments. As part of the European Aerosol, Clouds and Trace Gases
+ Research Infrastructure (ACTRIS, Laj & Coauthors
+ (2024)), the
+ Centre for Cloud Remote Sensing (CCRES) is aiming to provide
+ continuous and long-term data of cloud properties and the
+ thermodynamic state of the atmosphere, with Cloudnet being one of the
+ key tools. For atmospheric observatories, MWRs are therefore mandatory
+ to qualify as an ACTRIS-CCRES compatible station. The ACTRIS Central
+ Facility responsible for MWRs in the network is hosted within ACTRIS
+ Germany (ACTRIS-D).
+
The European cloud remote sensing network will encompass around 30
+ stations, including mobile platforms, and covering different
+ climatological zones. This network configuration enables
+ investigations of similarities of atmospheric processes and long-term
+ trends between those sites. Some of the participating stations have
+ been operational for more than a decade and Cloudnet products were
+ derived based on their individual setups and processing algorithms. To
+ ensure that the generated data sets are comparable, station operators
+ are required to follow the ACTRIS-CCRES standard operating procedures
+ and send raw data files to the central cloud remote sensing data
+ center unit (CLU, http://cloudnet.fmi.fi). CLU provides data storage
+ and provision, but also the centralized processing, including
+ visualization, in order to harmonize the data streams.
+
+
+ Statement of need
+
MWRpy
+ addresses the needs of a centralized processing, quality control of
+ MWR raw data, and deriving standardized output of meteorological
+ variables. The Python code is an advancement of the Interactive Data
+ Language (IDL)-based processing software mwr_pro
+ (Löhnert,
+ 2023) and is able to handle raw data from HATPRO manufactured
+ by Radiometer Physics GmbH (RPG, https://www.radiometer-physics.de/),
+ which is so far the only instrument type in the network. The output
+ format, including metadata information, variable names, and file
+ naming, is designed to be compliant with the data structure and naming
+ convention developed together with the EUMETNET Profiling Programme
+ E-PROFILE
+ (Rüfenacht
+ et al., 2021), which is establishing a MWR network with the
+ focus on near-real-time data provision. The processing chain in
+ E-PROFILE consists of a package to convert instrument generated files
+ into a common netCDF format using the convention shared with
+ MWRpy (mwr_raw2l1) and a second tool to run an
+ optimal estimation retrieval approach for advanced products
+ (mwr_l12l2). Both modules are designed to be implemented in the
+ central data hub of E-PROFILE for operational near-real-time data
+ processing in the network of the European Meteorological
+ Services1. As a research
+ infrastructure, ACTRIS is pursuing a different approach for the
+ product generation, which is based on statistical retrieval, while
+ still allowing stations to be part of both networks. In this way,
+ MWRpy
+ improves data compatibility and fosters cross network
+ collaborations.
+
The processing chain of
+ MWRpy
+ is replacing the mode of operation in Cloudnet, which previously
+ relied on pre-processed and non-harmonized MWR data, and therefore
+ contributes to more ACTRIS data consistency. Statistical analysis of
+ these consistent long-term data sets is expected to be beneficial not
+ only for atmospheric studies, but also for improving knowledge on
+ instrument operation and maintenance by monitoring key parameters from
+ the instrument and mandatory regular absolute calibrations
+ (approximately every 6 months). Future developments include the
+ support of further instrument types, if present in the network.
+ Furthermore, the flexible design of the code enables updating the
+ retrievals of meteorological variables, which will be derived from a
+ common statistical approach. For that, a training data set is derived
+ from a climatology of the atmospheric state (e.g. profiles from
+ radiosondes or model reanalysis) and simulated
+
+
+ TB
+ coming from a microwave radiative transfer model like
+ PyRTlib
+ (Larosa
+ et al., 2024). PyRTlib, as a Python
+ library for non-scattering atmospheric microwave radiative transfer
+ calculations, takes various input profiles to compute down- and
+ upwelling
+
+ TB
+ for microwave sensors from different observational platforms using
+ built-in atmospheric absorption models. This output, together with the
+ climatology, can then be used for retrieval training (not included in
+ MWRpy)
+ to update existing coefficients in the ACTRIS network.
+
+
+ Code design
+
MWRpy
+ is designed to be used as a stand-alone software since it covers the
+ full processing and visualization chain from raw data to higher level
+ products, but it is also embedded in the Python implementation of the
+ Cloudnet processing scheme CloudnetPy
+ (Tukiainen
+ et al., 2020). At first, data quality control is performed on
+ the mandatory data fields of measured
+
+ TB
+ at various frequencies and instrument specific housekeeping data to
+ generate quality flags. In the next step, auxiliary data (e.g., from a
+ weather station) are combined to produce daily netCDF files.
+ Subsequently advanced meteorological variables are derived by applying
+ coefficients from the statistical retrieval approaches and are stored
+ as separate daily files for variables originating from elevation scans
+ (e.g., temperature profiles) and all remaining measuring modes
+ (including vertical stare for e.g., LWP). Within the Cloudnet
+ processing framework the output of
+ MWRpy
+ is then harmonized and utilized by CloudnetPy,
+ together with data streams from other ACTRIS-CCRES instruments, like
+ cloud radar, to derive synergy products. All files, including
+ calibration and retrieval information, and corresponding
+ visualizations are stored in the Cloudnet data portal and accessible
+ through an API.
+
+
Flowchart of the MWRpy processing
+ chain (including main functions), with the last two steps being
+ exclusive for the CloudnetPy
+ implementation.
+
+
+
+
+ Acknowledgements
+
This work is funded by the Federal Ministry of Education and
+ Research (BMBF) under the FONA Strategy “Research for Sustainability”
+ and part of the implementation of ACTRIS Germany (ACTRIS-D) under the
+ research grant no. 01LK2002F. The operation of the Central Facilities
+ is supported by the Federal Ministry for the Environment, Nature
+ Conservation, Nuclear Safety and Consumer Protection (BMUV). The
+ implementation and operation of ACTRIS-D is co-funded by 11 German
+ research performing organizations.
+
+
+
+
+
+
+
+
+ LöhnertU.
+
+ Ground-based microwave radiometer reprocessing mwr_pro
+ Zenodo
+ 2023
+ https://doi.org/10.5281/zenodo.7973553
+ 10.5281/zenodo.7973553
+
+
+
+
+
+ IllingworthA. J.
+ Coauthors
+
+ Cloudnet: Continuous evaluation of cloud profiles in seven operational models using ground-based observations
+
+ 2007
+ 88
+ 6
+ https://doi.org/10.1175/BAMS-88-6-883
+ 10.1175/BAMS-88-6-883
+ 883
+ 898
+
+
+
+
+
+ LajP.
+ Coauthors
+
+ Aerosol, Clouds and Trace Gases Research Infrastructure – ACTRIS, the European research infrastructure supporting atmospheric science
+
+ 2024
+ https://journals.ametsoc.org/view/journals/bams/aop/BAMS-D-23-0064.1/BAMS-D-23-0064.1.xml
+ 10.1175/BAMS-D-23-0064.1
+
+
+
+
+
+ TukiainenS.
+ O’ConnorE.
+ KorpinenA.
+
+ CloudnetPy: A Python package for processing cloud remote sensing data
+
+ The Open Journal
+ 2020
+ 5
+ 53
+ https://doi.org/10.21105/joss.02123
+ 10.21105/joss.02123
+ 2123
+
+
+
+
+
+
+ WestwaterE. R.
+ CrewellS.
+ MätzlerC.
+
+ A review of surface-based microwave and millimeter-wave radiometric remote sensing of the troposphere
+
+ 2004
+ 2004
+ 310
+ 10.23919/URSIRSB.2004.7909438
+ 59
+ 80
+
+
+
+
+
+ RüfenachtR.
+ HaefeleA.
+ PospichalB.
+ CiminiD.
+ Bircher-AdrotS.
+ TurpM.
+ SugierJ.
+
+ EUMETNET opens to microwave radiometers for operational thermodynamical profiling in Europe
+
+ 2021
+ 2
+ 4
+ https://doi.org/10.1007/s42865-021-00033-w
+ 10.1007/s42865-021-00033-w
+
+
+
+
+
+ CrewellS.
+ LöhnertU.
+
+ Accuracy of boundary layer temperature profiles retrieved with multifrequency multiangle microwave radiometry
+
+ 2007
+ 45
+ 7
+ 10.1109/TGRS.2006.888434
+ 2195
+ 2201
+
+
+
+
+
+ CrewellS.
+ LöhnertU.
+
+ Accuracy of cloud liquid water path from ground-based microwave radiometry 2. Sensor accuracy and synergy
+
+ 2003
+ 38
+ 3
+ https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2002RS002634
+ 10.1029/2002RS002634
+
+
+
+
+
+
+
+ LöhnertU.
+ MaierO.
+
+ Operational profiling of temperature using ground-based microwave radiometry at Payerne: Prospects and challenges
+
+ 2012
+ 5
+ 5
+ https://amt.copernicus.org/articles/5/1121/2012/
+ 10.5194/amt-5-1121-2012
+ 1121
+ 1134
+
+
+
+
+
+ LarosaS.
+ CiminiD.
+ GallucciD.
+ NiloS. T.
+ RomanoF.
+
+ PyRTlib: An educational Python-based library for non-scattering atmospheric microwave radiative transfer computations
+
+ 2024
+ 17
+ 5
+ https://gmd.copernicus.org/articles/17/2053/2024/
+ 10.5194/gmd-17-2053-2024
+ 2053
+ 2076
+
+
+
+
+
+
E-PROFILE developed code for MWR processing
+ (mwr_raw2l1, mwr_l12l2) can be found at
+ https://github.com/MeteoSwiss
+
+
+
+
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