1. PROJECT ------------ Title: Electrical Aspects of Rainfall Generation Dates: 03/17 – 03/2022 Funding organisation: UAE National Centre for Meteorology and Seismology 2. DATASET ------------ Title: Electrical aspects of rainfall generation - supporting field data Description: This dataset contains atmospheric electric field, visibility and aerosol backscatter from a ceilometer during a field campaign as part of the project "Electrical aspects of rainfall generation". The measurements were obtained at Al Ain airport (24°15' N, 55°37' E), United Arab Emirates (UAE) from 2018-2022. Electric field was measured by a Campbell CS110 electric field mill at 3m height. Visibility was measured by a Biral SWS100 visibility sensor on the same mast as the CS110. The Vaisala CL31 ceilometer was installed approximately 300m from the other sensors. Publication Year: 2022 Creator(s): Dr Keri Nicoll, Prof R. Giles Harrison, Dr Graeme Marlton, Dr Martin Airey Organisation(s): University of Reading Rights-holder(s): University of Reading Cite as: Nicoll, K. A., Harrison, R. G., Marlton, G. J., and Airey, M. W. (2022) Electrical aspects of rainfall generation - supporting field data. University of Reading. Dataset. https://doi.org/10.17864/1947.000362 3. TERMS OF USE ----------------- Copyright 2022 University of Reading. This dataset is licensed by the rights-holder(s) under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/. 4. CONTENTS ------------ Six zip folders are included within the dataset: Folder 1: Efield.zip Folder 2: Visibility.zip Folder 3: ceilometer_raw_1.zip Folder 4: ceilometer_raw_2.zip Folder 5: ceilometer_raw_3.zip Folder 6: quicklook.zip The contents of each folder will now be described below. Folder 1 contains Electric field data for the years 2018 and 2019. Files are daily files, with Efield measured at 1Hz. The file name convention is as follows: YYMMDDEfield.csv where YY = year, MM = month and DD = day. E.g. 180129Efield.csv is for 29th Jan 2018. Column headings in each file are as follows: Time/date stamp, read number, Efield (V/m), leakage current, status flag. Only the Efield column is relevant (all other columns relate to manufacturer requirements). Folder 2 contains visibility data for the years 2018 and 2019. Files are daily files, with visibility measured at 1 minute resolution. The file name convention is as follows: YYMMDDVisibility.csv where YY = year, MM = month and DD = day. E.g. 180129visibility.csv is for 29th Jan 2018. Column headings in each file are as follows: Time/date stamp, read number, visibility (km), Present Weather code, monitor flag. Only the visibility and present weather columns are relevant (all other columns relate to manufacturer requirements). Folders 3, 4, and 5 contains aerosol backscatter data for the years 2018 and 2019. The data is in the raw format provided by the manufacturer (and logged every 3 seconds). Details on interpretation of this file are given in the manufacturer’s user guide on P60 of the PDF: http://cedadocs.ceda.ac.uk/1240/1/CL31_User%27s_Guide_M210482EN-F.pdf Folder 6 contains image files of the aerosol backscatter data from the CL31 ceilometer. Each file corresponds to one day. The file name convention is as follows: "ALAIN_CL31_QCYYYY_M_DD.png" where YYYY = year, M = month and DD = day. e.g. "ALAIN_CL31_QC2018_1_24.png" 5. METHOD and PROCESSING -------------------------- The data provided are the raw data from the sensors. No pre-processing of data has been performed other than to log the data. For each of the different measurement types, details of the sensors used and a link to the manufacturer user manuals is provided below. Electric field was measured by a Campbell CS110 electric field mill at 3m height. https://s.campbellsci.com/documents/us/manuals/cs110.pdf Visibility was measured by a Biral SWS100 visibility sensor on the same mast as the CS110. https://www.biral.com/wp-content/uploads/2018/02/SWS-Manual-105223.08B.pdf Aerosol backscatter was measured by a Vaisala CL31 ceilometer. http://cedadocs.ceda.ac.uk/1240/1/CL31_User%27s_Guide_M210482EN-F.pdf