MIDAS Data User Guide for UK Land Observations, v20210705

Background information on using data from the Met Office climate database, MIDAS. This version has minor update to add units for cloud height and visibility, decametres

MIDAS Data User Guide for UK Land Observations

Background information on using data from the Met Office climate database, MIDAS

NCAS CAO NLC-Camera Time-Lapse Video starting at 2020-06-21 20:00 UTC

A time-lapse video showing Noctilucent Clouds (NLCs) seen from southern England (51.15°N,-1.44°E) during the night of 21st/22nd June 2020. NLCs are a seasonal wonder of the natural world. They can only be seen from upper-middle and high latitudes during the mid-summer months (between mid May and mid August in the northern hemisphere). They are the result of ice crystals forming at the extraordinarily high altitude of around 82 km. This is 70 km higher than virtually all other clouds seen at these latitudes and qualifies as being at the edge of space (the atmospheric density and pressure are approximately 100,000th of their values at sea level). NLCs can only be seen during twilight hours, hence the name noctilucent, which means night-shining. In this video there is a mild display of NLCs during the dusk followed by a much more impressive display during the dawn. Note that British Summer Time (BST) is one hour ahead of Coordinated Universal Time (UTC). The solar elevation angles do not take account of atmospheric refraction, which is only noticeable when the sun is close to the horizon

CEDA Annual Report 2019 - 2020

This annual report presents key statistics for the year past (2019 - 2020) as well as a series of snapshots of activity, expressed as short highlights and short reports

NCAS CAO NLC-Camera Time-Lapse Video starting at 2020-07-11 00:00 UTC

A time-lapse video showing Noctilucent Clouds (NLCs) and a Comet seen from southern England (51.15°N,-1.44°E) during the dawn of 11th July 2020. NLCs are a seasonal wonder of the natural world. They can only be seen from upper-middle and high latitudes during the mid-summer months (between mid May and mid August in the northern hemisphere). They are the result of ice crystals forming at the extraordinarily high altitude of around 82 km. This is 70 km higher than virtually all other clouds seen at these latitudes and qualifies as being at the edge of space (the atmospheric density and pressure are approximately 100,000th of their values at sea level). NLCs can only be seen during twilight hours, hence the name noctilucent, which means night-shining. Note that British Summer Time (BST) is one hour ahead of Coordinated Universal Time (UTC). The solar elevation angles do not take account of atmospheric refraction, which is only noticeable when the sun is close to the horizon. The brightest star seen in the video is Capella, which is in the constellation Auriga. It starts near the bottom-centre and moves in an arc towards the right and upwards. The comet NEOWISE can be seen following a similar path from approximately 01:20 UTC

MIDAS Data User Guide for UK Land Observations, v20200921

Background information on using data from the Met Office climate database, MIDAS. This version has minor updates cover the user of the 'Z' prefix on station IDs

MIDAS Data User Guide for UK Land Observations, v1.1

Background information on using data from the Met Office climate database, MIDAS. This version has minor updates to sections 2 and 3

FIDUCEO project: Metrological assessment of consistency, stability and uncertainty of FIDUCEO FCDRs

This report addresses the assessment of the Fundamental Climate Data Records (FCDRs) using the methodologies developed under WP2 for mutual and relative consistency and stability (trend artefacts and step changes) both within and across sensor-series. Where possible the FCDR uncertainty information will be validated. Each sensor team has found it necessary to assess stability in different ways, because of the different context of different sensor series

FIDUCEO project (HIRS): Report on the HIRS FCDR: Uncertainty

This document is one of the five documents that make up the D2-2 report on “traceability chains for FCDRs”. Since the original project proposal our thoughts have refined and while this document describes the “sequence of measurement standards and calibrations that is used to relate a measurement result to a reference” (the VIM definition of a traceability chain), it is not presenting this in the form of a chain. This document provides an overview of the uncertainty analysis for the analysed sensors along with the methods to establish metrological traceability for the developed FCDRs. This document is specifically about the HIRS FCDR. The document D2-2a provides an overview of the purposes of these documents and explains the basis of the effects tables

FIDUCEO project: (Microwave): Report on the MW FCDR: Uncertainty

This document is one of the five documents that make up the D2-2 report on “traceability chains for FCDRs”. Since the original project proposal our thoughts have refined and while this document describes the “sequence of measurement standards and calibrations that is used to relate a measurement result to a reference” (the VIM definition of a traceability chain), it is not presenting this in the form of a chain. This document provides an overview of the uncertainty analysis for the analysed sensors along with the methods to establish metrological traceability for the developed FCDRs. This document is specifically about the MicrowaveFCDR (MHS, SSM-T2, AMSU-B). The document D2-2a provides an overview of the purposes of these documents and explains the basis of the effects tables