Rain rate estimation by simplified method using UHF wind profiler measurement at KMITL

2000 ◽  
Author(s):  
Chaiwat Somboonlarp ◽  
Nipha Leelaruji ◽  
Narong Hemmakorn ◽  
Apinan Manyanon ◽  
Yuichi Ohno
Keyword(s):  
Rain Rate ◽  
Wind Profiler ◽  
Rate Estimation ◽  
Simplified Method ◽  
Uhf Wind Profiler

scholarly journals Estimating Rain Rates from Tipping-Bucket Rain Gauge Measurements

2008 ◽  
Vol 25 (1) ◽  
pp. 43-56 ◽  
Author(s):  
Jianxin Wang ◽  
Brad L. Fisher ◽  
David B. Wolff
Keyword(s):  
Rain Rate ◽  
Tropical Rainfall Measuring Mission ◽  
Rain Gauge ◽  
Radar Reflectivity ◽  
Time Shift ◽  
Estimation Errors ◽  
Rate Estimation ◽  
Reflectivity Data ◽  
Rain Rates ◽  
Event Definition

Abstract This paper describes the cubic spline–based operational system for the generation of the Tropical Rainfall Measuring Mission (TRMM) 1-min rain-rate product 2A-56 from tipping-bucket (TB) gauge measurements. A simulated TB gauge from a Joss–Waldvogel disdrometer is employed to evaluate the errors of the TB rain-rate estimation. These errors are very sensitive to the time scale of rain rates. One-minute rain rates suffer substantial errors, especially at low rain rates. When 1-min rain rates are averaged over 4–7-min intervals or longer, the errors dramatically reduce. Estimated lower rain rates are sensitive to the event definition whereas the higher rates are not. The median relative absolute errors are about 22% and 32% for 1-min rain rates higher and lower than 3 mm h−1, respectively. These errors decrease to 5% and 14% when rain rates are used at the 7-min scale. The radar reflectivity–rain-rate distributions drawn from the large amount of 7-min rain rates and radar reflectivity data are mostly insensitive to the event definition. The time shift due to inaccurate clocks can also cause rain-rate estimation errors, which increase with the shifted time length. Finally, some recommendations are proposed for possible improvements of rainfall measurements and rain-rate estimations.

Application of X- and S-band radars for rain rate estimation over an urban area

1997 ◽  
Vol 22 (3-4) ◽  
pp. 259-264 ◽  
Author(s):  
R. Uijlenhoet ◽  
J.N.M. Stricker ◽  
H.W.J. Russchenberg
Keyword(s):  
Urban Area ◽  
Rain Rate ◽  
Rate Estimation

scholarly journals Rain‐rate estimation algorithm using signal attenuation of Ka‐band cloud radar

2019 ◽  
Vol 27 (1) ◽  
Author(s):  
Su‐Bin Oh ◽  
Pavlos Kollias ◽  
Jeong‐Soon Lee ◽  
Seung‐Woo Lee ◽  
Yong Hee Lee ◽  
...  
Keyword(s):  
Rain Rate ◽  
Estimation Algorithm ◽  
Signal Attenuation ◽  
Ka Band ◽  
Rate Estimation ◽  
Cloud Radar

Turbulent Dissipation Rate In The Boundary Layer Via UHF Wind Profiler Doppler Spectral Width Measurements

2002 ◽  
Vol 103 (3) ◽  
pp. 361-389 ◽  
Author(s):  
Sandra Jacoby-Koaly ◽  
B. Campistron ◽  
S. Bernard ◽  
B. Bénech ◽  
F. Ardhuin-Girard ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Dissipation Rate ◽  
Spectral Width ◽  
Wind Profiler ◽  
Turbulent Dissipation ◽  
Turbulent Dissipation Rate ◽  
Width Measurements ◽  
Uhf Wind Profiler

scholarly journals How weather events modify aerosol particle size distributions in the Amazon boundary layer

2021 ◽  
Author(s):  
Luiz Augusto Toledo Machado ◽  
Marco A. Franco ◽  
Leslie A. Kremper ◽  
Florian Ditas ◽  
Meinrat O. Andreae ◽  
...  
Keyword(s):  
Particle Size ◽  
Vertical Velocity ◽  
Ultrafine Particles ◽  
Rain Rate ◽  
Early Morning ◽  
Lightning Activity ◽  
Wind Profiler ◽  
Cloud Liquid Water ◽  
Weather Events ◽  
Aerosol Particle Size

Abstract. This study evaluates the effect of weather events on the aerosol particle size distribution (PSD) at the Amazon Tall Tower Observatory (ATTO). This research combines in-situ measurements of PSD and remote sensing data of lightning density, brightness temperature, cloud top height, cloud liquid water, and rain rate and vertical velocity. Measurements were obtained by a scanning mobility particle sizers (SMPS), the new generation of GOES satellites (GOES-16), the SIPAM S-band radar, and the LAP 3000 radar wind profiler recently installed at the ATTO-Campina site. The combined data allow exploring changes in PSD due to different meteorological processes. The average diurnal cycle shows a higher abundance of ultrafine particles (NUFP) in the early morning, which is coupled with lower concentrations in Aitken (NAIT) and accumulation (NACC) mode particles. From the early morning to the middle of the afternoon, an inverse behavior is observed, where NUFP decreases and NAIT and NACC increase, reflecting a typical particle growth process. Composite figures show an increase of NUFP before, during, and after lightning was detected by the satellite above ATTO. These findings strongly indicate a close relationship between vertical transport and deep convective clouds. Lightning density is connected with a large increase in NUFP, beginning approximately 100 minutes before the maximum lightning density and reaching peak values around 200 minutes later. In addition, the removal of NACC by convective transport was found. Both the increase in NUFP and the decrease in NACC appear in parallel with the increasing intensity of lightning activity. The NUFP increases exponentially with the thunderstorm intensity. In contrast, NAIT and NACC show a different behavior, decreasing from approximately 100 minutes before the maximum lightning activity and reaching a minimum at the time of maximum lightning activity. The effect of cloud top height, cloud liquid water, and rain rate shows the same behavior, but with different patterns among seasons. The convective processes do not occur continually but are modulated by gravity waves in the range of 1 to 5 hours, creating a complex mechanism of interaction with a succession of updrafts and downdrafts, clouds and clear sky situations. The radar wind profiler measured the vertical distribution of the vertical velocity. These profiles show that downdrafts are mainly located below 10 km, while aircraft observations during the ACRIDICON-CHUVA campaign had shown maximum concentrations of ultrafine particles mainly above 10 km. Our study opens new scientific questions to be evaluated in order to understand the intricate physical and chemical mechanisms involved in the production of new particles in Amazonia.

scholarly journals Ceilometer-Based Rain-Rate Estimation: A Case-Study Comparison With S-Band Radar and Disdrometer Retrievals in the Context of VORTEX-SE

2020 ◽  
Vol 58 (12) ◽  
pp. 8268-8284
Author(s):  
Francesc Rocadenbosch ◽  
Ruben Barragan ◽  
Stephen J. Frasier ◽  
Joseph Waldinger ◽  
David D. Turner ◽  
...  
Keyword(s):  
Rain Rate ◽  
Rate Estimation
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