Numerical simulation of the diurnal cycle of rainfall in SW Amazon basin during the 1999 rainy season: the role of convective trigger function
In continental areas, the maximum rainfall simulated with the Brazilian developments on the Regional Atmospheric Modeling System (BRAMS) occurs around 4 h earlier than the one observed with rain gauges. This work presents the successful implementation of a new convective trigger function (CTF) in th...
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| Veröffentlicht in: | Theoretical and applied climatology 2012-08, Vol.109 (3-4), p.473-483 |
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| creator | e Silva, Cláudio Moisés Santos de Freitas, Saulo Ribeiro Gielow, Ralf |
| description | In continental areas, the maximum rainfall simulated with the Brazilian developments on the Regional Atmospheric Modeling System (BRAMS) occurs around 4 h earlier than the one observed with rain gauges. This work presents the successful implementation of a new convective trigger function (CTF) in the convective parameterization scheme used in BRAMS that corrects this misfit between model and observations. The importance of the CTF formulation on the diurnal cycle of rainfall over the Amazon Basin is reflected by the following numbers: Over Rondonia (SW Amazonia), the original version of BRAMS simulates the maximum rainfall at 1400 UTC (1000 LST), with the new CTF maximum shifting to 1800 UTC (1400 LST), while the S-band radar rainfall maximum is at 1900 UTC (1500 LST). This is attributed to two factors: (1) the new CTF is now coupled to the sensible and latent heat fluxes at surface; (2) during the early morning, the convective available potential energy is reduced. |
| doi_str_mv | 10.1007/s00704-011-0571-0 |
| format | Article |
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| subjects | Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Atmospheric Sciences Climate science Climatology Earth and Environmental Science Earth Sciences Latent heat Original Paper Potential energy Rain Rain and rainfall Rain gauges Rainfall Rainy season River basins Seasons Simulation Waste Water Technology Water Management Water Pollution Control |
| title | Numerical simulation of the diurnal cycle of rainfall in SW Amazon basin during the 1999 rainy season: the role of convective trigger function |
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