scholarly journals The World aerosol Optical depth Research and Calibration Center (WORCC), Quality assurance and quality control of GAW-PFR AOD measurements

2017 ◽  
Author(s):  
Stelios Kazadzis ◽  
Natalia Kouremeti ◽  
Stephan Nyeki ◽  
Julian Gröbner ◽  
Christoph Wehrli
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Instrument Calibration ◽  
Radiation Center ◽  
New Methods ◽  
The World ◽  
Processing Techniques

Abstract. The World Optical Depth Research Calibration Center (WORCC) is a section within the World Radiation Center at Physikalisches-Meteorologisches Observatorium (PMOD/WRC), Davos, Switzerland, established after the recommendations of WMO for calibration of AOD related sun-photometers. WORCC is mandated to develop new methods for instrument calibration, to initiate homogenization activities among different AOD networks and to run a network (GAW-PFR) of sun-photometers. In this work we describe: the calibration hierarchy and methods used under WORCC and the basic procedures, test and processing techniques in order to ensure the quality assurance and quality control of the AOD retrieved data.

scholarly journals The World Optical Depth Research and Calibration Center (WORCC) quality assurance and quality control of GAW-PFR AOD measurements

2018 ◽  
Vol 7 (1) ◽  
pp. 39-53 ◽  
Author(s):  
Stelios Kazadzis ◽  
Natalia Kouremeti ◽  
Stephan Nyeki ◽  
Julian Gröbner ◽  
Christoph Wehrli
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
World Meteorological Organization ◽  
Instrument Calibration ◽  
Radiation Center ◽  
New Methods ◽  
The World ◽  
Processing Techniques

Abstract. The World Optical Depth Research Calibration Center (WORCC) is a section within the World Radiation Center at Physikalisches-Meteorologisches Observatorium (PMOD/WRC), Davos, Switzerland, established after the recommendations of the World Meteorological Organization for calibration of aerosol optical depth (AOD)-related Sun photometers. WORCC is mandated to develop new methods for instrument calibration, to initiate homogenization activities among different AOD networks and to run a network (GAW-PFR) of Sun photometers. In this work we describe the calibration hierarchy and methods used under WORCC and the basic procedures, tests and processing techniques in order to ensure the quality assurance and quality control of the AOD-retrieved data.

scholarly journals Toward a Standardized Metadata Protocol for Urban Meteorological Networks

2013 ◽  
Vol 94 (8) ◽  
pp. 1161-1185 ◽  
Author(s):  
Catherine L. Muller ◽  
Lee Chapman ◽  
C.S.B. Grimmond ◽  
Duick T. Young ◽  
Xiao-Ming Cai
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Best Practice ◽  
Urban Climate ◽  
Technical Information ◽  
High Resolution Data ◽  
Management Procedures ◽  
The World ◽  
Communication Methods ◽  
Resolution Data

With the growing number and significance of urban meteorological networks (UMNs) across the world, it is becoming critical to establish a standard metadata protocol. Indeed, a review of existing UMNs indicate large variations in the quality, quantity, and availability of metadata containing technical information (i.e., equipment, communication methods) and network practices (i.e., quality assurance/quality control and data management procedures). Without such metadata, the utility of UMNs is greatly compromised. There is a need to bring together the currently disparate sets of guidelines to ensure informed and well-documented future deployments. This should significantly improve the quality, and therefore the applicability, of the high-resolution data available from such networks. Here, the first metadata protocol for UMNs is proposed, drawing on current recommendations for urban climate stations and identified best practice in existing networks.

scholarly journals Daytime and nighttime aerosol optical depth implementation in CÆLIS

2020 ◽  
Vol 9 (2) ◽  
pp. 417-433 ◽  
Author(s):  
Ramiro González ◽  
Carlos Toledano ◽  
Roberto Román ◽  
David Fuertes ◽  
Alberto Berjón ◽  
...  
Keyword(s):  
Quality Control ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Processing System ◽  
Software Tool ◽  
Mean Differences ◽  
The University ◽  
Phase Angles ◽  
Climate Studies ◽  
Cloud Screening

Abstract. The University of Valladolid (UVa, Spain) has managed a calibration center of the AErosol RObotic NETwork (AERONET) since 2006. The CÆLIS software tool, developed by UVa, was created to manage the data generated by AERONET photometers for calibration, quality control and data processing purposes. This paper exploits the potential of this tool in order to obtain products like the aerosol optical depth (AOD) and Ångström exponent (AE), which are of high interest for atmospheric and climate studies, as well as to enhance the quality control of the instruments and data managed by CÆLIS. The AOD and cloud screening algorithms implemented in CÆLIS, both based on AERONET version 3, are described in detail. The obtained products are compared with the AERONET database. In general, the differences in daytime AOD between CÆLIS and AERONET are far below the expected uncertainty of the instrument, ranging in mean differences between -1.3×10-4 at 870 nm and 6.2×10-4 at 380 nm. The standard deviations of the differences range from 2.8×10-4 at 675 nm to 8.1×10-4 at 340 nm. The AOD and AE at nighttime calculated by CÆLIS from Moon observations are also presented, showing good continuity between day and nighttime for different locations, aerosol loads and Moon phase angles. Regarding cloud screening, around 99.9 % of the observations classified as cloud-free by CÆLIS are also assumed cloud-free by AERONET; this percentage is similar for the cases considered cloud-contaminated by both databases. The obtained results point out the capability of CÆLIS as a processing system. The AOD algorithm provides the opportunity to use this tool with other instrument types and to retrieve other aerosol products in the future.

scholarly journals Text Analysis Reveals Major Trends in Exploration Geophysics

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4550 ◽  
Author(s):  
Timofey Eltsov ◽  
Maxim Yutkin ◽  
Tadeusz W. Patzek
Keyword(s):  
Neural Network ◽  
Text Analysis ◽  
Field Data ◽  
New Methods ◽  
Current State ◽  
Usage Frequency ◽  
The World ◽  
Processing Techniques ◽  
Near Future ◽  
Over Time

Evolution of professional language reveals advances in geophysics: researchers enthusiastically describe new methods of surveying, data processing techniques, and objects of their study. Geophysicists publish their cutting-edge research in the proceedings of international conferences to share their achievements with the world. Tracking changes in the professional language allows one to identify trends and current state of science. Here, we explain our text analysis of the last 30 annual conferences organized by the Society of Exploration Geophysicists (SEG). These conferences are among the largest geophysical gatherings worldwide. We split the 21,864 SEG articles into 52 million words and phrases, and analyze changes in their usage frequency over time. For example, we find that in 2019, the phrase “neural network” was used more often than “field data.” The word “shale” became less commonly used, but the term “unconventional” grew in frequency. An analysis of conference materials and metadata allows one to identify trends in a specific field of knowledge and predict its development in the near future.

scholarly journals Results from the Fourth WMO Filter Radiometer Comparison for aerosol optical depth measurements

2018 ◽  
Vol 18 (5) ◽  
pp. 3185-3201 ◽  
Author(s):  
Stelios Kazadzis ◽  
Natalia Kouremeti ◽  
Henri Diémoz ◽  
Julian Gröbner ◽  
Bruce W. Forgan ◽  
...  
Keyword(s):  
Water Vapor ◽  
Individual Differences ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
High Accuracy ◽  
Measured Data ◽  
Air Mass ◽  
Filter Radiometer ◽  
The World ◽  
Near Future

Abstract. This study presents the results of the Fourth Filter Radiometer Comparison that was held in Davos, Switzerland, between 28 September and 16 October 2015. Thirty filter radiometers and spectroradiometers from 12 countries participated including reference instruments from global aerosol networks. The absolute differences of all instruments compared to the reference have been based on the World Meteorological Organization (WMO) criterion defined as follows: 95% of the measured data has to be within 0.005 ± 0.001∕m (where m is the air mass). At least 24 out of 29 instruments achieved this goal at both 500 and 865 nm, while 12 out of 17 and 13 out of 21 achieved this at 368 and 412 nm, respectively. While searching for sources of differences among different instruments, it was found that all individual differences linked to Rayleigh, NO2, ozone, water vapor calculations and related optical depths and air mass calculations were smaller than 0.01 in aerosol optical depth (AOD) at 500 and 865 nm. Different cloud-detecting algorithms used have been compared. Ångström exponent calculations showed relatively large differences among different instruments, partly because of the high calculation uncertainty of this parameter in low AOD conditions. The overall low deviations of these AOD results and the high accuracy of reference aerosol network instruments demonstrated a promising framework to achieve homogeneity, compatibility and harmonization among the different spectral AOD networks in the near future.

scholarly journals Instrument calibration and aerosol optical depth validation of the China Aerosol Remote Sensing Network

2009 ◽  
Vol 114 (D3) ◽  
Author(s):  
Huizheng Che ◽  
Xiaoye Zhang ◽  
Hongbin Chen ◽  
Bahaiddin Damiri ◽  
Philippe Goloub ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Instrument Calibration ◽  
Aerosol Remote Sensing

scholarly journals Day- and night-time aerosol optical depth implementation in CÆLIS

2020 ◽  
Author(s):  
Ramiro González ◽  
Carlos Toledano ◽  
Roberto Román ◽  
David Fuertes ◽  
Alberto Berjón ◽  
...  
Keyword(s):  
Quality Control ◽  
Aerosol Optical Depth ◽  
Optical Depth ◽  
Processing System ◽  
Software Tool ◽  
Night Time ◽  
Mean Differences ◽  
The University ◽  
Phase Angles ◽  
Cloud Screening

Abstract. The University of Valladolid (UVa, Spain) manages since 2006 a calibration center of the AErosol RObotic NETwork (AERONET). The CÆLIS software tool, developed by UVa, was created to manage the data generated by the AERONET photometers, for calibration, quality control and data processing purposes. This paper exploits the potential of this tool in order to obtain products like the aerosol optical depth (AOD) and Angstrom exponent (AE), which are of high interest for atmospheric and climate studies, as well as to enhance the quality control of the instruments and data managed by CÆLIS. The AOD and cloud screening algorithms implemented in CÆLIS, both based on AERONET version 3, are described in detail. The obtained products are compared with the AERONET database. In general, the differences in daytime AOD between CÆLIS and AERONET are far below the expected uncertainty of the instrument, ranging the mean differences between −1.3×10−4 at 870 nm and 6.2×10−4 at 380 nm. The standard deviations of the differences range from 2.8×10−4 at 675 nm to 8.1×10−4 at 340 nm. The AOD and AE at night-time calculated by CÆLIS from Moon observations are also presented, showing good continuity between day and night-time for different locations, aerosol loads and moon phase angles. Regarding cloud screening, around 99.9 % of the observations classified as cloud-free by CÆLIS are also assumed cloud-free by AERONET; this percentage is similar for the cases considered as cloud-contaminated by both databases. The obtained results point out the capability of CÆLIS as processing system. The AOD algorithm provides the opportunity to use this tool with other instrument types and to retrieve other aerosol products in the future.

Digitalization challenges for technogenic civilization

2021 ◽  
Vol 4 (1) ◽  
pp. 6-21 ◽  
Author(s):  
Evgeniy Maslanov
Keyword(s):  
Public Life ◽  
Digital Technologies ◽  
Data Capture ◽  
Huge Number ◽  
Digital Footprint ◽  
New Methods ◽  
Digital World ◽  
Processing Data ◽  
The World ◽  
Processing Techniques

Based on the comparison of technogenic civilization and traditional society, the article argues that the desire for change is a major feature of technogenic civilization. The latter tends to focus on the practice of writing and data recording. At the same time, the new European scientific knowledge, a key element of the technogenic civilization, emerged not only as the practice of mathematized experimental research of nature, but also as the practice of fixing new data and results and disseminating them among scientists. Management practitioners also actively use data capture. The active introduction of digital technologies has contributed to progress in all areas of public life. The analysis of these processes leads to the conclusion that they pose at least two fundamental challenges to the technogenic civilization associated with new methods of recording and processing data. First, the formation of a person's digital footprint raises the question of the specifics of her or his identity in the digital world and its connection with corporeality, and creates new existential challenges. Secondly, the ever-growing array of data and their active inclusion in the scientific turnover results in a huge number of data processing techniques and technologies. On their basis, research practices are constructed that focus on the search for correlations, rather than the formation of “bold hypotheses” that allow describing the world in a new way.

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