Evaluating the performance of the immersed boundary method within the grey zone for improved weather forecasts in the HRRR model

Arthur, Robert S.; Lundquist, Katherine A.; Bao, Jingyi

doi:10.2172/1544937

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Applications such as in air quality, heating, city and transport development, etc., are obviously numerous and of the highest economic and health values. While use of the IBM in atmospheric NWP models is an option that has been investigated with domains not permitting resolutions as fine as that needed for LES scales, e.g., Arthur et al (2018), to our knowledge it has not been successful so far.…”

Section: Discussion and Commentsmentioning

confidence: 99%

“…In addition to filtering two grid increment orography features at all their resolutions, at 0.25 km Vionnet et al 2015needed a local filter to remove slopes higher than 45°. While IBM methods at these resolutions could in principle handle topography as is, Arthur et al (2018) point out that "accuracy of the IBM appears to degrade with coarser grid resolution". Thus there is as tends to be referred to a "gray zone" of tens to hundreds of meters, where the performance of IBM requires attention.…”

Section: Non-conforming Grid Systems: Immersed Boundary and Cut-cellsmentioning

confidence: 99%

“…Thus there is as tends to be referred to a "gray zone" of tens to hundreds of meters, where the performance of IBM requires attention. Improving the performance of WRF-IBM at these resolutions, not yet studied extensively, is explored by Arthur et al (2018) and more recently Arthur et al (2020).…”

Section: Non-conforming Grid Systems: Immersed Boundary and Cut-cellsmentioning

confidence: 99%

See 2 more Smart Citations

Topography in Weather and Climate Models: Lessons from Cut-Cell Eta vs. European Centre for Medium-Range Weather Forecasts Experiments

Mesinger

Veljovic

2020

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

While the terrain-following (sigma) system of representing topography in atmospheric models has been dominant for about the last 60 years, already half a century ago problems using the system were reported in areas of steep topography. A number of schemes had been proposed to address these problems. However, when topography steepness exceeds a given limit all these schemes except the vertical interpolation of the pressure gradient begin to use model information that for physical reasons they should not use. A radical departure from the system was that of the step-topography eta; but its attractiveness was reduced by the discovery of the corner separation problem. The shaved-cell scheme, nowadays referred to as cut-cell, was free of that problem, and was tested subsequently in idealized as well as real case experiments with encouraging results. The eta discretization has lately been refined to make it also a cut-cell scheme. Another method referred to usually as immersed boundary method enabling treatment of terrain as complex as urban landscape came from computational fluid dynamics. It was made available coupled to the atmospheric Weather Research and Forecasting model. Results of recent experiments of the cut-cell Eta driven by European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble members are analyzed. In these experiments, all cut-cell Eta members achieved better verification scores with respect to 250 hPa wind speed than their ECMWF driver members. This occurred when an upper-tropospheric trough was crossing the Rocky Mountains barrier. These results are considerably less favorable for the Eta when switched to use sigma, i.e., Eta/sigma, pointing to the benefits of using topography intersecting as opposed to terrain-following systems. But even so the Eta/sigma shows an advantage over its driver members, suggesting that its other features deserve attention.

show abstract

Section: Discussion and Commentsmentioning

confidence: 99%

Section: Non-conforming Grid Systems: Immersed Boundary and Cut-cellsmentioning

confidence: 99%

Section: Non-conforming Grid Systems: Immersed Boundary and Cut-cellsmentioning

confidence: 99%

See 1 more Smart Citation

Topography in Weather and Climate Models: Lessons from Cut-Cell Eta vs. European Centre for Medium-Range Weather Forecasts Experiments

Mesinger

Veljovic

2020

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

show abstract

Evaluating the performance of the immersed boundary method within the grey zone for improved weather forecasts in the HRRR model

Cited by 1 publication

References 0 publications

Topography in Weather and Climate Models: Lessons from Cut-Cell Eta vs. European Centre for Medium-Range Weather Forecasts Experiments

Topography in Weather and Climate Models: Lessons from Cut-Cell Eta vs. European Centre for Medium-Range Weather Forecasts Experiments

Contact Info

Product

Resources

About