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 implemented two observationaloperators for dual polarimetric radars in two variational data assimilationsystems: WRF Var, the Weather Research and Forecasting Model variational dataassimilation system, and NHM-4DVAR, the nonhydrostatic variational dataassimilation system for the Japan Meteorological Agency nonhydrostatic model.The operators consist of a space interpolator, two types of variableconverters, and their linearized and transposed (adjoint) operators. Thespace interpolator takes account of the effects of radar-beam broadening inboth the vertical and horizontal directions and climatological beam bending.The first variable converter emulates polarimetric parameters with modelprognostic variables and includes attenuation effects, and the second onederives rainwater content from the observed polarimetric parameter (specificdifferential phase). We developed linearized and adjoint operators for thespace interpolator and variable converters and then assessed whether thelinearity of the linearized operators and the accuracy of the adjointoperators were good enough for implementation in variational systems. Theresults of a simple assimilation experiment showed good agreement betweenassimilation results and observations with respect to reflectivity andspecific differential phase but not with respect to differentialreflectivity.

Observational operators for dual polarimetric radars in variational data assimilation systems (PolRad VAR v1.0)