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Stefanie M. Herrmann and Karen I. Mohr

dual-wet-season regime; 4) in East Africa, from dual season to single season or multiple seasons; 5) in southern Africa, from single season to dual or multiple seasons; and 6) in central Africa, from nonseasonal humid to a single- or dual-wet-season regime. Whether more systematic transitions between climatological seasonality regimes are expected under projected climate change remains to be studied. 4. Summary and conclusions This study developed a continental-scale seasonality classification for

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Xiuzhen Li, Wen Zhou, and Yongqin David Chen

1. Introduction The climate in China differs throughout its vast territory because of differences in latitude, elevation, wind direction, and distance to oceans. A good understanding of how the climate varies by region is of great importance in a wide variety of applications. They include not only simply identifying regions with similar climate variability but also forecasting seasonal climate and applying hydrological measures, such as drought evaluation. Many climate classification schemes

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Johnathan P. Kirk and Gordon A. Cromley

-scale atmospheric behavior or vice versa. This is typically investigated by employing a classification scheme, which characterizes the wide variety of atmospheric conditions for a certain location over time into a manageable sample of representative weather types or patterns ( Davis and Kalkstein 1990 ; Yarnal 1993 ). Many different strategies exist for producing classifications, but one that has emerged recently in climate literature, which is also ideally suited for connecting weather patterns to discrete

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Shannon Mason, Christian Jakob, Alain Protat, and Julien Delanoë

were found to have the greatest effect on the overall SW radiation budget in the area: an optically thick midtopped cloud regime and a very frequent low cloud regime. A similar method based on mean cloud-top properties is frequently used for model evaluation (see Williams and Webb 2009 ). Historically, climate models have tended to overestimate frontal cloud and optically thick low cloud while underrepresenting optically thin low cloud (e.g., trade cumulus) and midtopped clouds ( Webb et al. 2001

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Budong Qian, Xuebin Zhang, Kai Chen, Yang Feng, and Ted O’Brien

, H. , 1995 : Misuses of statistical analysis in climate research. Analysis of Climate Variability: Applications of Statistical Techniques, H. von Storch and A. Navarra, Eds., Springer, 11–26 . Wang , X. L. , and V. R. Swail , 2001 : Changes of extreme wave heights in Northern Hemisphere oceans and related atmospheric circulation regimes. J. Climate , 14 , 2204 – 2220 . Wheaton , E. , and Coauthors , 2005 : Lessons learned from the Canadian drought years 2001 and 2002

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Tanlong Dai, Wenjie Dong, Yan Guo, Tao Hong, Dong Ji, Shili Yang, Di Tian, Xiaohang Wen, and Xian Zhu

of years in the period 1948–75 before abrupt change, n 2 is the number of years classified as after abrupt change, and N 2 is the number of years in the period 1976–2005 after the abrupt change. The last classification parameter, ε , characterizes the ability of phase space to represent the abrupt change, that is to say, the fit to the climate factors combined into the phase space with the abrupt change in the phase space. In this study, ε is divided into four classes: when ε < 70%, the

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Rosana Nieto Ferreira, Linwood Hall, and Thomas M. Rickenbach

1. Introduction As population increases ( U.S. Census Bureau 2013 ) and climate changes ( Solomon et al. 2007 ), water management and sustainability policymaking in the southeast (SE) United States will be increasingly dependent upon an improved understanding of the spatial and temporal distribution of regional precipitating systems ( Robinson 2006 ). Each year the southeastern United States receives precipitation from a variety of weather systems such as midlatitude cyclones ( Curtis 2006

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Sheng Ye, Hong-Yi Li, L. Ruby Leung, Jiali Guo, Qihua Ran, Yonas Demissie, and Murugesu Sivapalan

date is less representative of the occurrence date of the extreme events. For analysis of potential shifts in flood seasonality, we divided the MOPEX data records into two time periods, 1951–79 and 1980–99, following Coopersmith et al. (2014) . The year of 1980 was chosen as the cutoff year for its better representation of the hydrologic regime shift in the MOPEX catchments under a possibly changing climate compared with two other candidate cutoff years ( Coopersmith et al. 2014 ). We also tested

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Yizhak Feliks, Michael Ghil, and Andrew W. Robertson

irregular oscillations in the presence of colored noise. J. Climate , 9 , 3373 – 3404 . Barnston , A. G. , and R. E. Livezey , 1987 : Classification, seasonality and persistence of low-frequency atmospheric circulation patterns. Mon. Wea. Rev. , 115 , 1083 – 1126 . Bedrosian , E. , 1963 : A product theorem for Hilbert transforms. Proc. IEEE , 51 , 868 – 869 . Block , P. , and B. Rajagopalan , 2007 : Interannual variability and ensemble forecast of upper Blue Nile basin

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Hugo Carrão, Andrew Singleton, Gustavo Naumann, Paulo Barbosa, and Jürgen V. Vogt

Monitor product ( Svoboda et al. 2002 ; Goodrich and Ellis 2006 ; Quiring 2009 ). The information from the six indicators is blended with further (local) indicators and expert knowledge from hundreds of climate and water experts across the country to derive the final drought intensity map over the United States ( Svoboda et al. 2002 ). Because droughts are generally slow to emerge and slow to recede, the classification system defined in the Drought Monitor includes two extra SPI categories to the

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