Open AccessThe Effect of Radial Velocity Gridding Artifacts on Variationally Retrieved Vertical Velocities
Author(s) -
Scott Collis,
Alain Protat,
KaoShen Chung
Publication year - 2010
Publication title -
journal of atmospheric and oceanic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.774
H-Index - 124
eISSN - 1520-0426
pISSN - 0739-0572
DOI - 10.1175/2010jtecha1402.1
Subject(s) - interpolation (computer graphics) , spurious relationship , linear interpolation , radar , simple (philosophy) , meteorology , computer science , radial velocity , geology , algorithm , image (mathematics) , physics , computer vision , artificial intelligence , telecommunications , philosophy , stars , epistemology , machine learning , pattern recognition (psychology)
International audienceThis article investigates the source and impact of artifacts produced by ordered linear interpolation techniques on variationally retrieved updraft intensities. Qualitative reasoning for the generation of periodic perturbations in gridded products is presented and a simple analytical investigation into the impact of gridding artifacts on updraft retrieval is carried out. By projecting a non-convergent flow typical of Darwin, Australia, onto the viewing geometry of a scanning radar a numerical assessment of the impact of gridding artifacts is carried out. A simple enhancement to ordered linear interpolation, Mixed ordered linear interpolation, is proposed to reduce gridding artifacts. Radial velocity grids produced using both techniques are used to investigate the generation of spurious updrafts with the simple ordered linear interpolation technique producing erroneous updrafts on the order of 2 ms−1. To investigate the impact on vertical velocities retrieved from a real weather event radar derived measurements taken during the active monsoon phase of Tropical Warm Pool International Cloud Experiment are gridded using both techniques and vertical velocities are retrieved and contrasted