TITLE

Origin, Evolution, and Finescale Structure of the St. Valentine's Day Mesoscale Gravity Wave Observed during STORM-FEST. Part III: Gravity Wave Genesis and the Role of Evaporation

AUTHOR(S)
Jewett, Brian F.; Ramamurthy, Mohan K.; Rauber, Robert M.
PUB. DATE
April 2003
SOURCE
Monthly Weather Review;Apr2003, Vol. 131 Issue 4, p617
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
On 14 February 1992, a long-lived moderate-amplitude mesoscale gravity wave formed in Kansas during the Storm-scale Operational and Research Meteorology-Fronts Experiment Systems Test (STORM-FEST). Wave formation was evident in correlated surface pressure and wind fields. The wave of depression, accompanied by a weak rainband, tracked across the state. A wealth of data was collected on the mature wave as it passed over the STORM-FEST dual-Doppler domain. However, the mechanism of genesis remained difficult to ascertain, since wave formation occurred in a region of less comprehensive observations. The genesis of the STORM-FEST gravity wave is successfully simulated using the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (Penn State–NCAR) Mesoscale Model (MM5), which was run at 6-km grid spacing in the innermost domain. The lee cyclone movement, dry airmass development, and gravity wave formation over Kansas were successfully captured by the model. Results presented here indicate that evaporative processes associated with a rainband resulted in subsidence warming and depression of the underlying warm-frontal inversion. The reduced inversion height produced surface pressure falls, the surface manifestation of a developing gravity wave. Numerical experiments with and without evaporative processes have isolated the key importance of evaporatively driven downdrafts in wave genesis. A conceptual model of the development and evolution of the wave is presented that is consistent with both observations and the findings of the numerical experiments.
ACCESSION #
9337763

 

Related Articles

  • Evolución de variables hidrológicas en el Centro-Sud Bonaerense, República Argentina. Falasca, S.; Bernabé, M. // Revista Geográfica;ene-jun2006, Issue 139, p71 

    From the middle of the 20th century in a large part of Argentina territory, the presence of a marked humid cycle was noticed that allowed the shift in that sense of the agricultural frontier. Those more humid environmental conditions determined a decrease of the atmospheric demand of water and...

  • Representing Spatial Subgrid-Scale Precipitation Variability in a GCM. Hahmann, Andrea N. // Journal of Hydrometeorology;Oct2003, Vol. 4 Issue 5, p891 

    A method for spatial disaggregation of rainfall to be used within a GCM is presented and the climate sensitivity to its parameters is assessed. The method is based on the assumption of exponential distribution of rainfall rates that are a function of the area of the GCM grid square where...

  • The Regional Evapotranspiration of the Amazon. Werth, David; Avissar, Roni // Journal of Hydrometeorology;Feb2004, Vol. 5 Issue 1, p100 

    The annual cycle of evapotranspiration (ET) is an important component of the Amazon hydrological balance, which is of critical importance to the global water cycle. Understanding the changing water balance in this region is particularly important to estimate future global and regional...

  • Realization of Groundwater Situation under the Impact of Manmade River Consumption in Murzuk Basin-Libya. Abdelrahem, Isam M.; Rashid, Khalim; Ismail, Amiruddin // Australian Journal of Basic & Applied Sciences;Jan2013, Vol. 7 Issue 1, p388 

    Water is a scarce resource in arid and semi arid regions because of low rainfall and extreme climatic conditions, which enhance water, lose by evaporation. The situation in Libya is typical, with average yearly rainfall of less than 100 mm and evaporation as high as 6.8 mm/day. Under such...

  • A Practical Example of Low-Frequency Trend Removal. Denholm-Price, J.C.W.; Rees, J.M. // Boundary-Layer Meteorology;Jan1998, Vol. 86 Issue 1, p181 

    Three different ’classical‘ methods of removing low-frequency trends are used to detrend some instrumental data, and their effect is evaluated. The examples given here highlight problems that may occur whenever detrending is necessary. The trend present in the data arises from the...

  • Evaporation-wind feedback and the organizing of tropical convection on the planetary scale. Part... Xie, Shang-Ping; Kubokawa, Atsushi // Journal of the Atmospheric Sciences;12/1/93, Vol. 50 Issue 23, p3884 

    Part II. Investigates the nonlinear evolution of the quasi-linear evaporation-wind feedback instability obtained in Part I of this study in a two-level model of the aqua-planet atmosphere. Review of related literature; Assumptions of the model; Dependence on the surface humidity.

  • Long-lost Lake Agassiz offers clues to climate change.  // Biomedical Market Newsletter;10/10/2011, Vol. 21, p285 

    The article reports that the conditions of long-vanished Lake Agassiz encouraged evaporation based from the research by a geologist from the University of Cincinnati.

  • Composite Singular Value Decomposition Analysis of Moisture Variations Associated with the Madden–Julian Oscillation: ERA-40 Analysis. Weare, Bryan C. // Journal of Climate;Oct2005, Vol. 18 Issue 20, p4329 

    The role of moisture variations in the initiation of Madden–Julian oscillation (MJO) variability is reexamined through composite singular value decomposition (CSVD) analyses using the European Centre for Medium-Range Weather Forecasts (ECMWF) 40-yr Re-Analyses (ERA-40) data. The CSVD...

  • Implicit-Explicit Multistep Methods for Fast-Wave-Slow-Wave Problems. Durran, Dale R.; Blossey, Peter N. // Monthly Weather Review;Apr2012, Vol. 140 Issue 4, p1307 

    Implicit-explicit (IMEX) linear multistep methods are examined with respect to their suitability for the integration of fast-wave-slow-wave problems in which the fast wave has relatively low amplitude and need not be accurately simulated. The widely used combination of trapezoidal implicit and...

Share

Read the Article

Courtesy of

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics