1. Seasonal diagnostic and temporal variability of the daily precipitation in Argentina Departamento de Ciencias de la Atmósfera y los Océanos- FCEyN-UBA Olga C. Penalba, Federico Robledo

2. Probability of daily precipitation events Daily percentiles Persistence of rainday and no rainday Objectives Analyze the annual cycle of the following properties:

3. Probability of daily precipitation events Daily percentiles Persistence of rainday and no rainday Objectives Special interest in extreme events and very heavy rainfall Analyze the temporal variability of:

4. Data set Daily rainfall information 40 rain gauges Missing data < 10% Quality control Period 1961-2003 1908-2003

5. Analysis For each station and over its whole period 50 th, 75 th, 90 th and 95 th percentiles of daily precipitation Probability of daily rainfall exceeding a threshold 0.1, 10, 50, 80 and 100 mm 75 th, 90 th and 95 th percentiles Persistence of rainday and no rainday Probability of rainday when the day before was a rainday

6. Annual cycle of 50 th, 75 th, 90 th and 95 th percentiles of daily precipitation amount

7. Mean of 50 th percentile of daily rainfall (mm/day) per month

8. Mean of 95 th percentile of daily rainfall (mm/day) per month

9. Annual cycle of relative frequency of daily precipitation that exceeds 0.1 mm

10. Relative frequency of daily precipitation > 0.1 mm

11. Relative frequency of daily precipitation events exceeding 10 mm/day

12. Monthly mean of persistence of rainday

13. Temporal variability

14. Relative frequency of daily precipitation > 0.1 mm Tres Arroyos AnnualJanuaryOctober Corrientes Nueve de Julio Pilar

15. Relative frequency of daily precipitation > 0.1 mm Tres Arroyos Annual January October Corrientes Nueve de Julio Pilar AnnualJulyApril

16. Relative frequency of daily precipitation greater than 10 mm greater than 0.1 mm Santa Rosa Rosario

17. Relative frequency of daily precipitation > 0.1 mm Kendall´s tau (filled squares: significant at p<0.05) Trend

18. Relative frequency of daily precipitation > 95 th percentile Kendall´s tau (filled squares: significant at p<0.05) Trend

19. Extreme events and very heavy rainfall Daily rainfall > 50 and 80 mmuncommon Daily rainfall > 100 mm 4 10 74 16 Autumn > Spring