[{"name":"oden-artofmelt-2023-ceilometer-1","title":"Cloud base heights and atmospheric backscatter observations from expedition ARTofMELT, Arctic Ocean, 2023","summary":"Cloud base heights and atmospheric backscatter data are obtained from a lidar ceilometer instrument deployed on the 7th top deck of the Swedish icebreaker Oden during the expedition ARTofMELT (Atmospheric Rivers and the Onset of Arctic Melt) in the Fram Strait pack ice during the spring transition, 8 May to 14 June of 2023. Measurements ran continuously during the whole expedition.\r\n\r\nThe observed data include direct cloud-base heights from thresholding backscatter, derived so-called 'cloud scenes' with cloud base height and cloudiness for multiple cloud layers from a clustering technique, and also the lidar backscatter profile directly from the instrument.","citations":"Sonja Murto, Michael Tjernstr\u00f6m, Michail Karalis, John Prytherch (2024) Cloud base heights and atmospheric backscatter observations from expedition ARTofMELT, Arctic Ocean, 2023 \u2014 raw data. Dataset version 1. Bolin Centre Database. https:\/\/doi.org\/10.17043\/oden-artofmelt-2023-ceilometer-raw-1\r\n\r\nSonja Murto, John Prytherch (2024) Scripts for quality control and creating netCDF files from ceilometer observations from the expedition ARTofMELT, Arctic Ocean, 2023. Software version 1.0.0. Bolin Centre Code Repository. https:\/\/doi.org\/10.57669\/oden-artofmelt-2023-ceilometer-1.0.0","comments":"##### Measurement system\r\nThe data was obtained from a lidar ceilometer from Vaisala (Vaisala CL31). Clouds are detected by thresholds on backscatter radiation from an eye-safe lidar. When the lowest cloud layer is not covering the sky, multiple cloud layers can be detected. The instrument also provides a cloud scene product based on the last 10 minutes of data using a proprietary clustering algorithm that in addition to cloud base height also provide a cloud fraction for each layer. The original backscatter profile is also provided.\r\n\r\n##### Quality control\r\nNo data quality control is applied, except for adding the instrument height to the cloud base height variables.\r\n\r\n##### Associated raw data and code\r\nThe raw data, from which this dataset is derived, was created by [Murto et al. (2024)](https:\/\/doi.org\/10.17043\/oden-artofmelt-2023-ceilometer-raw-1) and is available separately. The current dataset is the concatenation of the original raw files on the native time scale and also averaged into 1 min, 10 min and 20 min averaging periods to accommodate the user. The computer codes, in Matlab and Python, written by [Murto and Prytherch (2024)](https:\/\/git.bolin.su.se\/bolin\/oden-artofmelt-2023-ceilometer), used to derive this dataset in NetCDF format from the raw data files are also available. \r\n\r\n##### Data creators' roles\r\nThe instrument system was continuously logging and was monitored by the Stockholm University Meteorology team onboard Oden:\r\n- Sonja Murto (operator and dataset creator)\r\n- Michail Karalis (operator)\r\n- Michael Tjernstr\u00f6m (chief scientist; operator)\r\n\r\nJohn Prytherch (also Stockholm University) is responsible for the instrument system.\r\n\r\n##### The expedition\r\nData were collected during the ARTofMELT 2023 expedition on board the Swedish icebreaker Oden, which was organized by the [Swedish Polar Research Secretariat](https:\/\/www.polar.se\/en\/expeditions\/previous-expeditions\/arctic\/artofmelt-2023\/) from 8 May through 14 June, 2023.","category":"Atmosphere","subcategory":"Weather observations","keywords":"Clouds; Cloud base height; Cloud fraction; Lidar backscatter; Backscatter profiles; Arctic; Arctic Ocean; Meteorology; Atmosphere; Weather observations; ARTofMELT; ARTofMELT 2023 expedition; Icebreaker Oden","scientist":"Sonja Murto, Michael Tjernstr\u00f6m, Michail Karalis, John Prytherch","firstname":"Sonja","lastname":"Murto","address":"Department of Meteorology; Stockholm University","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science > Atmosphere","location":"Ocean > Arctic Ocean","progress":"","language":"English","project":"ARTofMELT expedition in spring 2023. This dataset was collected with instruments that are part of \"Oden as a National Infrastructure\", funded by the Swedish Infrastructure Council (RFI: 2021-00153). The project ARTofMELT was funded by the Swedish Research Council (VR: 2022-03052).","publisher":"Bolin Centre Database","version":"1","constrains":"","access":""}]