The Step-Mountain Coordinate: Physical Package

Janjić, Zavisă

doi:10.1175/1520-0493(1990)118<1429:tsmcpp>2.0.co;2

Cited by 683 publications

(339 citation statements)

References 0 publications

Supporting

Mentioning

318

Contrasting

Unclassified

Order By: Relevance

“…The Eta surface layer scheme (Janjic 1996(Janjic , 2002) based on similarity theory (Monin & Obukhov 1954) physics option is used along with the Noah land surface model (Chen & Dudhia 2001). Finally, the Mellor-YamadaJanjic turbulent kinetic energy planetary boundary layer (PBL) model (Janjic 1990(Janjic , 1996(Janjic , 2002Mellor & Yamada 1982) is called every time step on both WRF domains.…”

Section: Atmospheric Model (Wrf)mentioning

confidence: 99%

An integrated ocean circulation, wave, atmosphere, and marine ecosystem prediction system for the South Atlantic Bight and Gulf of Mexico

Xue

Zambon

Yao

et al. 2015

Journal of Operational Oceanography

View full text Add to dashboard Cite

An integrated nowcast/forecast modelling system covering the South Atlantic Bight and Gulf of Mexico (SABGOM) is in operation, utilizing sophisticated model coupling and parallel computing techniques. This three-dimensional, highresolution, regional nowcast/forecast system provides a nowcast and an 84 h forecast of marine weather, ocean waves and circulation, and basic marine ecosystem conditions to the public via a Google Map interface. The SABGOM system runs automatically daily and supports a series of user-defined online applications. Extensive model validations were performed online against in situ and satellite-observed ocean conditions. The SABGOM system exhibits a reliable capability of providing valuable forecasts.

show abstract

Section: Atmospheric Model (Wrf)mentioning

confidence: 99%

An integrated ocean circulation, wave, atmosphere, and marine ecosystem prediction system for the South Atlantic Bight and Gulf of Mexico

Xue

Zambon

Yao

et al. 2015

Journal of Operational Oceanography

View full text Add to dashboard Cite

show abstract

“…This is done using the standard technique (e.g., Arakawa and Lamb 1977) of writing the advective form of a difference equation so that it is equivalent to its flux form. For example, in case of the diffusion contribution to the time change of specific humidity, q, this amounts to replacing (5.1) of Janjic (1990) by Fig. 5 Wind speed cross section, along the approximate direction of katabatic flow over the Reeves glacier, Antarctica, obtained using code without sloping steps and piecewise linear vertical advection, and height point wind averaging without including the blocked winds (left panel), and using the former two code modifications, and centered averaging of winds to calculate exchange coefficients (right panel).…”

Section: Piecewise Linear Vertical Advection Of Dynamic Variablesmentioning

confidence: 99%

“…Once most of the physics package of the Eta was put together at the end of the 1980s (Janjic 1990) in tests that followed a conspicuous problem encountered was that of runaway convection over warm water. This was addressed in Janjic (1994) by modifications of the Betts-Miller convection scheme via implementation of two mechanisms sensitive to the intensity of convection.…”

Section: Physics: Betts-miller-janjic Convectionmentioning

confidence: 99%

“…It was later discovered, however, that the Eta problem with excessive precipitation over warm water of the late 1980s was not caused by the Betts-Miller convection scheme, but by a faulty scheme for the surface heat transport. Once the surface fluxes scheme of Janjic (1990) was replaced by the ''lbulk'' scheme of Mesinger (Mesinger and Lobocki 1991;see also Mesinger 2010), the case of Janjic (1994) with heavy spurious precipitation was rerun using the original Betts-Miller scheme, and no spurious heavy precipitation was obtained. This result is shown in the essay on the Eta Cumulus Convection (BMJ) Scheme posted at http://etamodel.cptec.inpe.br/doc.shtml, where also more detail on various parameters and additional discussion is included.…”

Section: Physics: Betts-miller-janjic Convectionmentioning

confidence: 99%

See 1 more Smart Citation

An upgraded version of the Eta model

Mesinger

Chou

Gomes

et al. 2012

Meteorol Atmos Phys

148

View full text Add to dashboard Cite

Upgrades implemented over a number of years in an open source version of the Eta model, posted at the CPTEC web site http://etamodel.cptec.inpe.br/, are summarized and examples of benefits are shown. The version originates from the NCEP's Workstation Eta code posted on the NCEP web site http://www.emc.ncep.noaa.gov/ mmb/wrkstn_eta, which differs from the NCEP's latest operational Eta by having the WRF-NMM nonhydrostatic option included. Most of the upgrades made resulted from attention paid to less than satisfactory performance noted in several Eta results, and identification of the reasons for the problem. Others came from simple expectation that including a feature that is physically justified but is missing in the code should help. The most notable of the upgrades are the introduction of the so-called sloping steps, or discretized shaved cells topography; piecewise-linear finitevolume vertical advection of dynamic variables; vapor and hydrometeor loading in the hydrostatic equation, and changes aimed at refining the convection schemes available in the Eta. Several other modifications have to do with the calculation of exchange coefficients, conservation in the vertical diffusion, and diagnostic calculation of 10-m winds. Several examples showing improved performance resulting from the dynamics changes are given. One includes a case of unrealistically low temperatures in several mountain basins generated by a centered vertical advection difference scheme's unphysical advection from below ground, removed by its replacement with a finitevolume scheme. Another is that of increased katabatic winds in the Terra Nova Bay Antarctica region. Successful forecast of the severe downslope zonda wind case in the lee of the highest peaks of the Andes is also shown, and some of the recent successful verification results of the use of the upgraded model are pointed out. The code is used at numerous places, and along with setup information it is available for outside users at the CPTEC Eta web site given above.

show abstract

“…The high sensitivity of the simulated precipitation to the saturation pressure departure was also confirmed by Alapaty et al (1994) in a numerical study of orographic-convective rainfall during the Indian southwest monsoon using a limitedarea nested model. The scheme is also implemented into the eta-model of the U.S. NMC (Janjic, 1990(Janjic, , 1994 and the CSIRO limited-area model of Australia (Evans et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of the GCM-Simulated Large-Scale Structures to Two Cumulus Parameterizations

Baik

Takahashi

1995

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

To examine the sensitivity of the simulated large-scale structures to the Betts-Miller and the ArakawaSchubert cumulus parameterizations, a series of 6-month integrations are performed using the CCSR/NIES atmospheric general circulation model with a horizontal triangular resolution of 21 and 20 vertical levels. The model results are time-averaged for the last three months, that is, June-July-August mean. Comparisons between the simulations using the Betts-Miller scheme and the Arakawa-Schubert scheme indicate that although the simulated large-scale structures are generally similar to each other, there are some noticeable differences. These include the temperatures in the middle and upper troposphere at mid-latitudes in the northern hemisphere, the location of the maximum convective heating in the tropical deep connective region, the convective heating/cooling in the boundary layer, the precipitation distribution pattern over the tropical western Pacific and the vertical profile of the vertical turbulent heat transport. Sensitivity experiments with different adjustment parameters in the Betts-Miller scheme show that the precipitation distribution pattern over the tropical western Pacific is very sensitive to the adjustment time scale and stability weight as well as the saturation pressure departure. It is also shown that the partition between the convective precipitation and the large-scale precipitation is most sensitive to the saturation pressure departure.

show abstract

The Step-Mountain Coordinate: Physical Package

Cited by 683 publications

References 0 publications

An integrated ocean circulation, wave, atmosphere, and marine ecosystem prediction system for the South Atlantic Bight and Gulf of Mexico

An integrated ocean circulation, wave, atmosphere, and marine ecosystem prediction system for the South Atlantic Bight and Gulf of Mexico

An upgraded version of the Eta model

Sensitivity of the GCM-Simulated Large-Scale Structures to Two Cumulus Parameterizations

Contact Info

Product

Resources

About