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

A new method of deriving high-resolution top-of-atmosphere spectral radiancesin 10 181 bands, over the whole outgoing long-wave spectrum of the Earth, ispresented. Correlations between different channels measured by the InfraredAtmospheric Sounding Interfermeter (IASI) on the MetOp-A (Meteorological Operation) satellite andunobserved wavenumbers are used to estimate far infrared (FIR) radiances at0.5 cm−1 intervals between 25.25 and 644.75 cm−1 (the FIR),and additionally between 2760 and 3000 cm−1 (the NIR – near infrared). Radiances simulated by theline-by-line radiative transfer model (LBLRTM) are used to construct theprediction model. The spectrum is validated by comparing the Integrated NadirLong-wave Radiance (INLR) product spanning the whole 25.25–3000 cm−1range with the corresponding broadband measurements from the Clouds and the Earth's Radiant Energy System (CERES) instrument on the Terra and Aquasatellites at points of simultaneous nadir overpass. There is a mean difference of 0.3 W m−2 sr−1 (0.5% relative difference).This is well within the uncertainties associated with the measurements madeby either instrument. However, there is a noticeable contrast when the biasis separated into night-time and daytime scenes with the latter beingsignificantly larger, possibly due to errors in the CERES Ed3 Spectral Response Functions (SRF) correctionmethod. In the absence of an operational spaceborne instrument that isolatesthe FIR, this product provides a useful proxy for suchmeasurementswithin the limits of the regression model it is based on, which is shown tohave very low root mean squared errors. The new high-resolution spectrum ispresented for global mean clear and all skies where the FIR is shownto contribute 44 and 47% to the total INLR, respectively. In terms of thespectral cloud effect (Cloud Integrated Nadir Long-wave Radiance – CINLR), the FIR contributes 19% and in somesubtropical instances appears to be negative; results that would gounobserved with a traditional broadband analysis

Using IASI to simulate the total spectrum of outgoing long-wave radiances