Assimilation of lidar planetary boundary layer height observations
TLDR
In this paper, Lidar backscatter and wind retrievals of the planetary boundary layer height (PBLH) are assimilated into 22-hourly forecasts from the NASA Unified-Weather and Research Forecast (NU-WRF) model during the Plains Elevated Convection at Night (PECAN) campaign on 11-July-2015 in Greensburg, Kansas, using error statistics collected from the model profiles to compute the necessary covariance matrices.Abstract:
. Lidar backscatter and wind retrievals of the planetary boundary layer height (PBLH) are assimilated into 22-hourly forecasts from the
NASA Unified – Weather and
Research Forecast (NU-WRF) model during the Plains Elevated Convection at Night (PECAN) campaign on 11 July 2015 in Greensburg,
Kansas, using error statistics collected from the model profiles to compute the necessary covariance matrices. Two separate
forecast runs using different PBL physics schemes were employed, and comparisons with six independent radiosonde profiles were made
for each run. Both of the forecast runs accurately predicted the PBLH and the state variable profiles within the planetary boundary layer
during the early morning, and the assimilation had a small impact during this time.
In the late afternoon, the forecast runs showed decreased accuracy as the convective boundary layer developed.
However, assimilation of
the Doppler lidar PBLH observations was
found to improve the temperature and V -velocity profiles relative to independent radiosonde profiles. Water vapor
was overcorrected, leading to increased differences with independent data. Errors in the U velocity were made slightly larger.
The computed forecast error covariances between the PBLH and state variables
were found to rise in the late afternoon, leading to the larger improvements in the afternoon.
This work represents the first effort to assimilate PBLH into forecast states using ensemble methods.read more
Citations
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References
More filters
Journal ArticleDOI
Development of a turbulence closure model for geophysical fluid problems
George L. Mellor,Tetsuji Yamada +1 more
TL;DR: The second-moment turbulent closure hypothesis has been applied to geophysical fluid problems since 1973, when genuine predictive skill in coping with the effects of stratification was demonstrated as discussed by the authors.
Journal ArticleDOI
Sequential data assimilation with a nonlinear quasi-geostrophic model using Monte Carlo methods to forecast error statistics
TL;DR: In this article, a new sequential data assimilation method is proposed based on Monte Carlo methods, a better alternative than solving the traditional and computationally extremely demanding approximate error covariance equation used in the extended Kalman filter.
Journal ArticleDOI
The Ensemble Kalman Filter: theoretical formulation and practical implementation
TL;DR: A fairly extensive discussion is devoted to the use of time correlated model errors and the estimation of model bias, and an ensemble based optimal interpolation scheme is presented as a cost-effective approach which may serve as an alternative to the EnKF in some applications.
The Ensemble Kalman Filter: Theoretical formulation and practical implementation
TL;DR: The EnKF has a large user group, and numerous publications have discussed applications and theoretical aspects of it as mentioned in this paper, and also presents new ideas and alternative interpretations which further explain the success of the EnkF.
Journal ArticleDOI
The Step-Mountain Eta Coordinate Model: Further Developments of the Convection, Viscous Sublayer, and Turbulence Closure Schemes
TL;DR: In this article, a major revision of the Betts and Miller convection scheme was made, a new marine viscous sublayer scheme was designed, and the Mellor-Yamada planetary boundary layer (PBL) formulation was retuned.
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