English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. We present a new ground-based system for measurements ofmiddle-atmospheric carbon monoxide (CO) at Ny-Alesund, Svalbard, andthe altitude profiles of CO volume mixing ratios (VMRs) measured during the2017/2018 winter. The Carbon Monoxide Radiometer for AtmosphericMeasurements (CORAM) records spectra from CO spectral emissions in themiddle atmosphere with the aid of a low-noise amplifier designed for the230  GHz spectral region. Altitude profiles of CO VMRs are retrieved from themeasured spectra using an optimal estimation inversion technique. Theprofiles in the current dataset have an average altitude range of 47–87  km ,with special consideration to be given to data at > ∼ 70 km altitude. The estimated uncertainty in the CO profilepeaks at ∼12  % of the a priori data used in the inversion. TheCORAM profiles are compared to co-located CO measurements from the MicrowaveLimb Sounder (MLS) aboard the Aura satellite and show a difference of 7.4–16.1 %, with a maximum absolute difference of 2.5 ppmv at 86  km altitude.CO profiles are currently available at 1  h resolution between November 2017and January 2018. The instrument measures during Arctic winter becausesummer time CO concentrations are so low as to be undetectable by CORAM.

Ground-based millimetre-wave measurements of middle-atmospheric carbon monoxide above Ny-Ålesund (78.9° N, 11.9° E)