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

As the first gravity wave (GW) climatology study using nadir-viewing infraredsounders, 50 Atmospheric Infrared Sounder (AIRS) radiance channels areselected to estimate GW variances at pressure levels between 2–100 hPa. TheGW variance for each scan in the cross-track direction is derived fromradiance perturbations in the scan, independently of adjacent scans along theorbit. Since the scanning swaths are perpendicular to the satellite orbits,which are inclined meridionally at most latitudes, the zonal component of GWpropagation can be inferred by differencing the variances derived between thewestmost and the eastmost viewing angles.  Consistent with previous GW studies using various satellite instruments,monthly mean AIRS variance shows large enhancements over meridionallyoriented mountain ranges as well as some islands at winter hemisphere highlatitudes. Enhanced wave activities are also found above tropical deepconvective regions. GWs prefer to propagate westward above mountain ranges,and eastward above deep convection. AIRS 90 field-of-views (FOVs), rangingfrom +48° to −48° off nadir, can detect large-amplitude GWswith a phase velocity propagating preferentially at steep angles (e.g., thosefrom orographic and convective sources). The annual cycle dominates the GWvariances and the preferred propagation directions for all latitudes.Indication of a weak two-year variation in the tropics is found, which ispresumably related to the Quasi-biennial oscillation (QBO).  AIRS geometry makes its out-tracks capable of detecting GWs with verticalwavelengths substantially shorter than the thickness of instrument weightingfunctions. The novel discovery of AIRS capability of observing shallowinertia GWs will expand the potential of satellite GW remote sensing andprovide further constraints on the GW drag parameterization schemes in thegeneral circulation models (GCMs)

Gravity wave variances and propagation derived from AIRS radiances