Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 9 Integration of hydrological models on different spatial and temporal scales 2006 10.5194/adgeo-9-93-2006 http://www.adv-geosci.net/9/93/2006/ http://www.adv-geosci.net/9/93/2006/adgeo-9-93-2006.html http://www.adv-geosci.net/9/93/2006/adgeo-9-93-2006.pdf 93 100 2006-09-26 Varying spatial patterns of trend and seasonality in Eurasian runoff time series R. Rödel roedel@uni-greifswald.de Institute for Geography and Geology, Greifswald, Germany Atmospheric circulation indices can be used to explain the variability of runoff on a continental scale. Beside well-known regional anomalies of precipitation and runoff that correlate with phases of the North Atlantic Oscillation (NAO) there are also drifting fields of annual discharge anomalies. Following the trend of the NAO, these fields move along a longitudinal axis from western Europe to the Lena catchment in Siberia and back again. The same pattern is observable in the changing flow regimes. This paper describes the origin and causes of these anomaly fields and explains them as the results of important climate variations in the northern hemisphere. Arnell, N. W.: Spatial and temporal variability in European river flows and the North Atlantic oscillation, in: FRIEND '97 – Regional Hydrology, edited by: Gustard, A. and S. Blazkova, IAHS Publ. No. 264, Wallingford, 77–85, 1997. Bodo, B. A.: Monthly Discharge Data for World Rivers V1.3, NCAR, http://dss.ucar.edu/, files ds552.0, ds553.2 and the US data, 2001, date of access: 10.11.2005. Burn, D. H. and Soulis, E. D.: The Use of Hydrologic Variables in Detecting Climate Change: Possibilities for Single Station and Regional Analysis, in: Using Hydrometric Data to Detect and Monitor Climatic Change, Proceedings of NHRI Symposium No. 8, April 1991, Saskatoon, 1992. Dettinger, M. D. and Diaz, H. F.: Global Characteristics of Stream Flow Seasonality and Variability, J. Hydrometeorol., 1, 8, 289–310, 2000. GRDC – data provided by Global Runoff Data Centre (http://grdc.bafg.de/), Koblenz, Germany. Hurrel, J. W.: Decadal Trends in the North Atlantic Oscillation Regional Temperatures and Precipitation, Science, 269, 676–679, actual data see: http://www.cgd.ucar.edu/cas/jhurrell/indices.html (date of access: 10.11.2005), 1995. Krasovskaia, I.: Entropy-based grouping of river flow regimes, J. Hydrol., 202, 173–191, 1997. Krasovskaia, I., Gottschalk, L., and Kundzewicz, Z. W.: Dimensionality of Scandinavian river flow regimes, Hydrol. Sci. J., 44(5), 705–723, 1999. Mysak, L. A.: Interdecadal Variability of northern High Latitudes, in: Beyond El Niño, Decadal and Interdecadal Climate Variability, edited by: Navarra, A., Springer, Berlin, Heidelberg, 1–23, 1999. Peel, M. C., Mc Mahon, T. A., Finlayson, B., and Watson, F. G. R.: Identification and explanation of continental differences in the variability of annual runoff, J. Hydrol., 250, 224–240, 2001. Popova, V. V. and Shmakin, A. B.: Influence of the North Atlantic Oscillation on multiyear hydrological and thermal regime of northern Eurasia. I. Statistical analysis of observational data, Russ. Meteorol. Hydrol., 5, 47–56, 2003. R-ArcticNET (v3.0): http://www.R-ArcticNET.sr.unh.edu, date of access: 10.11.2005. Rödel, R. and Hoffmann, T.: Quantifying the efficiency of river regulation, Adv. Geosci., 5, 75–82, 2005. Timmermann, A. and Latif, M.: Thermohaline Circulation – a coupled node of the NAO, J. Clim., 11, 1906–1931, 1998. Zhuravin, S. A.: Change of hydrological regimes over the central part of European Russia resulting from climate variations, in: FRIEND 2002 – Regional Hydrology, edited by: van Lanen, H. A. J. and S. Demuth, IAHS Publ. No. 274, Wallingford, 441–447, 2002.