Tartu, Estonia, 24-26 January 2005 LITHUANIAN HYDROMETEOROGICAL SERVICE under the Ministry of Environment VILNIUS UNIVERSITY Division of Hydrology & Climatology.

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Presentation transcript:

Tartu, Estonia, 24-26 January 2005 LITHUANIAN HYDROMETEOROGICAL SERVICE under the Ministry of Environment VILNIUS UNIVERSITY Division of Hydrology & Climatology Case study based on one dimensional model with Kain-Fritsch convection parameterization scheme Paulius Jalinskas Tartu, Estonia, 24-26 January 2005

The role of the different trigger functions MAIN GOALS To test: Downdraft effect The role of the different trigger functions

RCA1D (SMHI Rossby Centre Regional Climate Model) Physical parameterizations in the model follow closely those in the operational version of the HIRLAM at SMHI Deep convection case 2330 UTC 26-30 June 1997

Fig. 1: Precipitation (ppt) in mm/day and total cloud cover (%) from RCA1D simulations with no downdrafts (NODD), with downdrafts (norm) and timeseries of observations (OBS)

Fig. 2: Outgoing longwave radiation (OLR) in Wm-2 and total cloud water path in kg/m2 from RCA1D simulations with no downdrafts (NODD), with downdrafts (norm) and timeseries of observations (OBS)

Fig. 3: Precipitation (ppt) in mm/day and total cloud cover (%) from RCA1D simulations with precipitation fall-out rate equal to 0.02 (Lrate02), 0.09 (Lrate09) and timeseries of observations (OBS)

Fig. 4: Outgoing longwave radiation (OLR) in Wm-2 and total cloud water path in kg/m2 from RCA1D simulations with precipitation fall-out rate equal to 0.02 (Lrate02), 0.09 (Lrate09) and timeseries of observations (OBS)

Fig. 5: Precipitation (ppt) in mm/day and total cloud cover (%) from RCA1D simulations with only relative humidity (rh trig), only temperature (t trig) and both trigger functions (norm); timeseries of observations (OBS)

Fig. 6: Outgoing longwave radiation (OLR) in Wm-2 and total cloud water path in kg/m2 from RCA1D simulations with only relative humidity (rh trig), only temperature (t trig) and both trigger functions (norm); timeseries of observations (OBS)

Conclusions: Downdrafts act as drying factor and indirectly affect surface radiation budget Precipitation fall-out rate isn’t a crucial factor for deep convection event Both relative humidity and temperature trigger function resulted increase of total cloud cover just before heavy rainfall event

Thank you for your attention !