Search Results

You are looking at 151 - 160 of 2,178 items for :

  • Model performance/evaluation x
  • Journal of Atmospheric and Oceanic Technology x
  • Refine by Access: All Content x
Clear All
Lee-Lueng Fu and Clement Ubelmann

calibration and validation of SWOT after its launch. There will certainly be benefits from these altimeters in evaluating the performance of SWOT over large scales. Their utility for calibration and validation will be limited through the analysis of crossover differences with the SWOT observations. The time differences of the crossover differences will not be limited to short periods in which the sea-state and atmospheric conditions would remain nearly identical as in the case of the tandem missions. The

Full access
Cuong M. Nguyen and V. Chandrasekar

on the self-consistency between signals from the waveforms. The signal from the second waveform is estimated at each range gate using knowledge of the medium obtained from the first waveform. The SES processing is an enhancement of the conventional pulse compression techniques, and it is able to improve the system sensitivity significantly as well as provide very good Doppler tolerance and PSL performance. This paper is organized as follows. The discrete signal model for pulse compression weather

Full access
L. Alados-Arboledas, J. Vida, and J. I. Jiménez

through thesilicon dome, but seems to be due to solar heating ofthe dome (either KRS-5 or silicon) that results in additional energy fluxes over the sensor surface. In this paper we present the results of several experiments designed to evaluate the performance of thesilicon dome pyrgeometer in daytime. Our calculationof the energy budget over the sensor surface indicatesthat about 11-12 W m-2 are added to the pyrgeometermeasurements for each degree of difference betweendome and base temperatures.2

Full access
Kanghui Zhou, Yongguang Zheng, Wansheng Dong, and Tingbo Wang

. Experimental results Classical skill scores, including the POD, FAR, threat score (TS), accuracy, bias, and equitable threat score (ETS), are typically used for evaluating deterministic forecasts; however, they also can be used for evaluating the probabilistic forecast performance by thresholding the probabilistic forecasts and turning them into deterministic forecasts. After different thresholds of probability were tested, we determined that when the probabilistic threshold value was 0.5, we could obtain

Free access
V. Klaus, G. Chérel, P. Goupil, and N. Pénetier

for the radio electric waves. The second one, which is a direct application of the theory developed by Tatarskii (1971) , considers a diffusion process of electromagnetic waves due to refractive index perturbations brought about by the acoustic waves. It was applied for the first time by Clifford and Wang (1977) and expanded, for example, by Lataitis (1992) . This last method may be quite useful for fine-tuning the model because it provides a stochastic approach to evaluate the wrinkling of

Full access
Niranjan S. Ghaisas and Cristina L. Archer

provides a threshold value that can be useful while evaluating different layouts (see section 5 ). A comparison between two layouts can be considered meaningful only if the predicted powers differ by more than 4%. b. Horns Rev wind farm The performance of the geometry-based models is next assessed for a layout other than that of the Lillgrund wind farm. The Horns Rev wind farm, located in the North Sea off the coast of Denmark, comprises 80 turbines arranged in an almost rectangular layout of 10

Full access
Dmitri N. Moisseev, Cuong M. Nguyen, and V. Chandrasekar

pulse pair and PTDM can be significantly different. To minimize the difference one can introduce a second precipitation echo into the model. To detect cases where the assumption of a Gaussian-shaped precipitation spectrum fails, one can use a combination of a normalized trace: and the R 2 goodness of fit parameter based on the imaginary part of the autocovariance function (5) ( Nguyen et al. 2008 ): where 〈·〉 denotes a mean value. The goodness of fit parameters are evaluated at the

Full access
Micheal Hicks, Belay Demoz, Kevin Vermeesch, and Dennis Atkinson

Ceilometer Proof of Concept Project was to show the capabilities of ceilometers beyond detecting sky conditions. This paper utilizes the dataset to evaluate the performance of an aerosol-based ML height detection algorithm, in anticipation of ceilometer backscatter data at AWSs being made available for user consumption in the near future. Hicks et al. (2015) used a consortium of automated aerosol-based detection methods [i.e., hybrid, hybrid-lowest (H-L), 1D Haar wavelet covariance transform (WCT), and

Full access
Florian Le Guillou, Sammy Metref, Emmanuel Cosme, Clément Ubelmann, Maxime Ballarotta, Julien Le Sommer, and Jacques Verron

height (SSH) from realistic altimetric observations in the context of the future SWOT mission. The proposed mapping technique uses a 1.5-layer QG model forced by observations of SSH. The model is gradually nudged toward the observations while running forward and backward within a temporal window in an iterative process so as to overcome the problem of time distribution of the observations. The performance of this mapping technique, dubbed the BFN-QG, has been evaluated and compared with the standard

Open access
W. Erick Rogers and David W. C. Wang

. 10.1080/10236730290026540 Alves, J. H. G. M. , and Banner M. L. , 2003 : Performance of a saturation-based dissipation-rate source term in modeling the fetch-limited evolution of wind waves. J. Phys. Oceanogr. , 33 , 1274 – 1298 . 10.1175/1520-0485(2003)033<1274:POASDS>2.0.CO;2 Anctil, F. , Donelan M. A. , Forristall G. Z. , Steele K. E. , and Ouellet Y. , 1993 : Deep-water field evaluation of the NDBC-SWADE 3-m discus directional buoy. J. Atmos. Oceanic Technol. , 10 , 97

Full access