High-Resolution, Rapid-Scan Dual-Doppler Retrievals of Vertical Velocity in a Simulated Supercell
High-Resolution, Rapid-Scan Dual-Doppler Retrievals of Vertical Velocity in a Simulated Supercell
复制标题
模拟超级细胞中垂直速度的高分辨率、快速扫描双多普勒反演
DOI:
10.1175/jtech-d-18-0211.1
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发表时间:
2019
影响因子:
2.2
通讯作者:
Xue, Ming
中科院分区:
文献类型:
--
作者:
Dahl, Nathan A.;Shapiro, Alan;Potvin, Corey K.;Theisen, Adam;Gebauer, Joshua G.;Schenkman, Alexander D.;Xue, Ming
Observation system simulation experiments are used to evaluate different dual-Doppler analysis (DDA) methods for retrieving vertical velocitywat grid spacings on the order of 100 m within a simulated tornadic supercell. Variational approaches with and without a vertical vorticity equation constraint are tested, along with a typical (traditional) method involving vertical integration of the mass conservation equation. The analyses employ emulated radar data from dual-Doppler placements 15, 30, and 45 km east of the mesocyclone, with volume scan intervals ranging from 10 to 150 s. The effect of near-surface data loss is examined by denying observations below 1 km in some of the analyses. At the longer radar ranges and when no data denial is imposed, the “traditional” method produces results similar to those of the variational method and is much less expensive to implement. However, at close range and/or with data denial, the variational method is much more accurate, confirming results from previous studies. The vorticity constraint shows the potential to improve the variational analysis substantially, reducing errors in thewretrieval by up to 30% for rapid-scan observations (≤30 s) at close range when the local vorticity tendency is estimated using spatially variable advection correction. However, the vorticity constraint also degrades the analysis for longer scan intervals, and the impact diminishes with increased range. Furthermore, analyses using 30-s data also frequently outperform analyses using 10-s data, suggesting a limit to the benefit of increasing the radar scan rate for variational DDA employing the vorticity constraint.
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DOI:
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发表时间:
2010
期刊:
影响因子:
--
作者:
A. Shapiro;K. Willingham;C. Potvin
通讯作者:
C. Potvin
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
Jeffrey Frame;P. Markowski;Yvette P. Richardson;J. Straka;J. Wurman
通讯作者:
J. Wurman
影响因子:
3.2
作者:
Zachary B. Wienhoff;H. Bluestein;Louis J. Wicker;J. Snyder;A. Shapiro;C. Potvin;J. Houser;D. Reif
通讯作者:
D. Reif
影响因子:
3.2
作者:
P. Markowski;Yvette P. Richardson;James N. Marquis;J. Wurman;K. Kosiba;P. Robinson;D. Dowell;E. Rasmussen;R. Davies-Jones
通讯作者:
P. Markowski;Yvette P. Richardson;James N. Marquis;J. Wurman;K. Kosiba;P. Robinson;D. Dowell;E. Rasmussen;R. Davies-Jones
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
C. Potvin;D. Betten;Louis J. Wicker;K. Elmore;M. Biggerstaff
通讯作者:
M. Biggerstaff