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  • Key words: Asian summer monsoon, systematic errors, temperature, moisture, heat budget, moisture budget.  (1)
  • Key words: Numerical investigation, Somali jet, the Western Ghat.  (1)
  • Monsoon depression  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A Study on the Performance of the NCMRWF Analysis and Forecasting System During Asian Summer Monsoon: Thermodynamic Aspects (1999)
    Springer
    Pure and applied geophysics 154 (1999), S. 141-162 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Asian summer monsoon, systematic errors, temperature, moisture, heat budget, moisture budget.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The thermodynamic characteristics of the Asian summer monsoon are examined with a global analysis-forecast system. In this study, we investigated the large-scale balances of heat and moisture by making use of operational analyses as well as forecast fields for June, July and August (JJA), 1994. Apart from elucidating systematic errors in the temperature and moisture fields, the study expounds the influence of these errors on the large-scale budgets of heat and moisture over the monsoon region. The temperature forecasts of the model delineate predominant cooling in the middle and lower tropospheres over the monsoon region. Similarly, the moisture forecasts evince a drying tendency in the lower troposphere. However, certain sectors of moderate moistening exist over the peninsular India and adjoining oceanic sectors of the Arabian Sea and Bay of Bengal.¶The broad features of the large-scale heat and moisture budgets represented by the analysis/forecast fields indicate good agreement with the observed aspects of the summer monsoon circulation. The model forecasts fail to retain the analyzed atmospheric variability in terms of the mean circulation, which is indicated by underestimation of various terms of heat and moisture budgets with an increase in the forecast period. Further, the forecasts depict an anomalous diabatic cooling layer in the lower middle troposphere of the monsoon region which inhibits vertical transfer of heat and moisture from the mixed layer of the atmospheric boundary layer to the middle troposphere. In effect, the monsoon circulation is considerably weakened with an increase in the forecast period. The treatment of shallow convection and the use of interactive clouds in the model can reduce the cooling bias considerably.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050225
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical Investigation of the Somali Jet Interaction with the Western Ghat Mountains (1999)
    Springer
    Pure and applied geophysics 154 (1999), S. 365-396 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Numerical investigation, Somali jet, the Western Ghat.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —Several major features of the interaction of the Somali jet with the Western Ghat Mountains have been observed. These include a pressure ridge, strong vertical motions, and occurrences of highly reflective cloud and heavy rainfall rates along the west coast of India. A triple nested regional weather prediction model has been used to investigate the dynamic interaction between the Somali jet and the Western Ghat Mountains. Two numerical experiments were conducted; one with the topography of western India and the other without. In the experiment without topography, the Western Ghat Mountains were removed from the innermost domain. The results for the innermost domain in the two experiments were analyzed and compared. The results from the simulation with topography captured several of the observed features of the Somali jet interaction with the Western Ghat Mountains. The simulation without topography failed to reveal these features. The results suggest that the blocking effect of the Western Ghats plays an important role in the prediction of the rainfall over the west coast of India.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050234
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of three different boundary-layer parameterisations in a regional atmospheric model on the simulation of summer monsoon circulation (1997)
    Springer
    Boundary layer meteorology 84 (1997), S. 363-381 
    Details
    ISSN: 1573-1472
    Keywords: Indian summer monsoon circulation ; Monsoon depression ; Planetary boundary layer ; Bulk method ; First order closure scheme ; TKE closure scheme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Bulk, first-order and turbulent kinetic energy (TKE) closure schemes are used to parameterise the boundary-layer physics in a high resolution, limited area model. The model was used to simulate the summer monsoon circulations over India. The domain selected included the monsoon trough over northern India, a region of mesoscale convection. A monsoon depression was present at the time of the simulation. The results indicate that the TKE closure scheme combined with the Monin–Obukhov surface-layer similarity relation provided the best 48-hour simulation of the circulation and the rainfall associated with the monsoon depression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000402013655
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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