The diurnal cycle of precipitation in Estonia during the warm period (from April to October) is analysed separately at continental and coastal stations. The results were obtained using hourly data from the automated gauges at 13 stations in 2003–2013 as well as from the pluviographic records at 10 stations in 1991–2003. The diurnal cycle is approximated using the second-order trigonometric polynomial. A clear diurnal cycle of precipitation with the maximum in the afternoon and evening (13–19 EET – East European Time), and the minimum at night and in the morning (22–11 EET) was revealed at the continental stations of Estonia. The daily amplitude was the highest in summer and much lower in spring and autumn. The highest monthly mean daily amplitudes up to 7 mm were observed in June and July. The diurnal cycle of precipitation was much weaker at the coastal stations without clear maxima and minima and with lower amplitudes. In autumn, the coastal stations showed clearer and bimodal maxima in the early morning and in the evening. The diurnal distribution of precipitation is quite stable, which is confirmed by the high similarity of the curves characterizing these two periods.
Biasutti, M., Yuter, S. E., Burleyson, C. D. & Sobel, A. H. 2012. Very high resolution rainfall patterns measured by TRMM precipitation radar: seasonal and diurnal cycles. Climate Dynamics, 39, 239–258.
http://dx.doi.org/10.1007/s00382-011-1146-6
Dai, A. 2001. Global precipitation and thunderstorm frequencies. Part II: diurnal variations. Journal of Climate, 14, 1092–1111.
http://dx.doi.org/10.1175/1520-0442(2001)014<1092:GPATFP>2.0.CO;2
Dai, A., Lin, X. & Hsu, K.-L. 2007. The frequency, intensity, and diurnal cycle of precipitation in surface and satellite observations over low- and mid-latitudes. Climate Dynamics, 29, 724–744.
http://dx.doi.org/10.1007/s00382-007-0260-y
Devasthale, A. & Norin, L. 2014. The large-scale spatio-temporal variability of precipitation over Sweden observed from the weather radar network. Atmospheric Measurement Techniques, 7, 1605–1617.
http://dx.doi.org/10.5194/amt-7-1605-2014
Fujibe, F., Yamazaki, N. & Kobayashi, K. 2006. Long-term changes in the diurnal precipitation cycles in Japan for 106 years (1898–2003). Journal of Meteorological Society of Japan, 84, 311–317.
http://dx.doi.org/10.2151/jmsj.84.311
Jaagus, J., Briede, A., Rimkus, E. & Remm, K. 2010. Precipitation pattern in the Baltic countries under the influence of large-scale atmospheric circulation and local landscape factors. International Journal of Climatology, 30, 705–720.
Janowiak, J. E., Kousky, V. E. & Joyce, R. J. 2005. Diurnal cycle of precipitation determined from the CMORPH high spatial and temporal resolution global precipitation analyses. Journal of Geophysical Research, 110, D23105.
http://dx.doi.org/10.1029/2005JD006156
Jeong, J.-H., Walther, A., Nikulin, G., Chen, D. & Jones, C. 2011. Diurnal cycle of precipitation amount and frequency in Sweden: observation versus model simulation. Tellus, 63A, 664–674.
http://dx.doi.org/10.1111/j.1600-0870.2011.00517.x
Kikuchi, K. & Wang, B. 2008. Diurnal precipitation regimes in the global tropics. Journal of Climate, 21, 2680–2696.
http://dx.doi.org/10.1175/2007JCLI2051.1
Kilpeläinen, T., Tuomenvirta, H. & Jylhä, K. 2008. Climatological characteristics of summer precipitation in Helsinki during the period 1951–2000. Boreal Environment Research, 13, 67–80.
Lanza, L. G. & Stagi, L. 2009. High resolution performances of catching type rain gauges from the laboratory phase of the WMO field intercomparison of rain intensity gauges. Atmospheric Research, 94, 555–563.
http://dx.doi.org/10.1016/j.atmosres.2009.06.012
Mandapaka, P. V., Germann, U. & Panziera, L. 2013. Diurnal cycle of precipitation over complex Alpine orography: inferences from high-resolution radar observations. Quarterly Journal of Royal Meteorological Society, 139, 1025–1046.
http://dx.doi.org/10.1002/qj.2013
Matsui, T., Mocko, D., Lee, M.-I., Tao, W.-K., Suarez, M. I. & Pielke, R. A. Sr. 2010. Ten-year climatology of summertime diurnal rainfall rate over the conterminous U.S. Geophysical Research Letters, 37, L13807.
Rouault, M., Sen Roy, S. & Balling, R. C. Jr. 2013. The diurnal cycle of rainfall in South Africa in the austral summer. International Journal of Climatology, 33, 770–777.
http://dx.doi.org/10.1002/joc.3451
Saidi, H., Ciampittiello, M., Dresti, C. & Turconi, L. 2014. Extreme rainfall events: evaluation with different instruments and measurement reliability. Environmental and Earth Science, 72, 4607–4616.
http://dx.doi.org/10.1007/s12665-014-3358-7
Sen Roy, S. 2009. Spatial variations in the diurnal patterns of winter precipitation in India. Theoretical and Applied Climatology, 96, 347–356.
http://dx.doi.org/10.1007/s00704-008-0045-1
Sen Roy, S. & Balling, R. C. Jr. 2007. Diurnal variations in summer season precipitation in India. International Journal of Climatology, 27, 969–976.
http://dx.doi.org/10.1002/joc.1458
Svensson, C. & Jakob, D. 2002. Diurnal and seasonal characteristics of precipitation at an upland site in Scotland. International Journal of Climatology, 22, 587–598.
http://dx.doi.org/10.1002/joc.674
Tammets, T. & Jaagus, J. 2013. Climatology of precipitation extremes in Estonia using the method of moving precipitation totals. Theoretical and Applied Climatology, 111, 623–639.
http://dx.doi.org/10.1007/s00704-012-0691-1
Tammets, T. & Jakovleva, O. 2001. Intensity of Estonian rains. Year-book of the Estonian Geographical Society, 33, 77–88 [in Estonian, with English summary].
Twardosz, R. 2007. Seasonal characteristics of diurnal precipitation variation in Krakow (South Poland). International Journal of Climatology, 27, 957–968.
http://dx.doi.org/10.1002/joc.1439
Vasvári, V. 2005. Calibration of tipping-bucket rain gauges in the Graz urban research area. Atmospheric Research, 77, 18–28.
http://dx.doi.org/10.1016/j.atmosres.2004.12.012
Walther, A., Jeong, J.-H., Nikulin, G., Chen, D. & Jones, C. 2013. Evaluation of the warm season diurnal cycle of precipitation over Sweden simulated by the Rossby Centre regional climate model RCA3. Atmospheric Research, 119, 131–139.
http://dx.doi.org/10.1016/j.atmosres.2011.10.012
Wüest, M., Frei, C., Altenhoff, A., Hagen, M., Litschi, M. & Schär, C. 2010. A gridded hourly precipitation dataset for Switzerland using rain-gauge analysis and radar-based disaggregation. International Journal of Climatology, 30, 1764–1775.
Yang, S., Kuo, K.-S. & Smith, E. A. 2008. Persistent nature of secondary diurnal modes of precipitation over oceanic and continental regimes. Journal of Climate, 21, 4115–4131.
http://dx.doi.org/10.1175/2008JCLI2140.1
Yaqub, A., Seibert, P. & Formayer, H. 2011. Diurnal precipitation cycle in Austria. Theoretical and Applied Climatology, 103, 109–118.
http://dx.doi.org/10.1007/s00704-010-0281-z
Yin, S., Chen, D. & Xie, Y. 2009. Diurnal variations of precipitation during the warm season over China. International Journal of Climatology, 29, 1154–1170.
http://dx.doi.org/10.1002/joc.1758
http://dx.doi.org/10.1002/joc.3718
