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Additional supporting information may be found in the online version of this article.

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2013glXXXXXXfs01.pdfPDF document108KBoxplots of stochastic trends from 1000 simulations and corresponding observed trends for 2 stations, one having a significant positive trend (station location 29.47N, 96.93W) and the other a non-significant negative trend (station location 36.59N, 119.35W). Red line indicates the median value of the 1000 simulated trends; edges of the blue box indicate the 25th and 75th percentiles of the distribution; the black bars (whiskers) indicate the 2.5th and 97.5th percentiles of the distribution; and red crosses represent the simulated values that lie outside the designated 95% confidence interval.
2013glXXXXXXfs02.pdfPDF document3028KTrends (normalized w.r.t. climatology) of (a) total number of annual wet days (AWD) and (b) extreme annual dry spell (ADS) for 1950-2009. Color bubbles indicate location of the stations, sign and significance of the trend estimates. The size (as well as the shading) of the bubble is proportional to the magnitude of the trend. The percentages in parentheses indicate fraction of the total number of stations (774) having such trend category.
2013glXXXXXXfs03.pdfPDF document606KDifference in total number of wet-season wet days (WWD) and dry-season wet days (DWD) normalized with respect to DWD, interpolated over the surface with values given by the underlying horizontal color legend. Wet (dry) season defined as the 91-day period with the climatologically maximum (minimum) number of precipitating events. The black dots represent station locations.
2013glXXXXXXfs04.pdfPDF document11953KTrends (in days/century) of (a) total number of wet-season wet days (WWD), (b) total number of dry-season wet days (DWD), (c) extreme wet-season dry spell (WDS), (d) extreme dry-season dry spell (DDS).
2013glXXXXXXfs05.pdfPDF document3404KTrends (normalized w.r.t. climatology) of total number of wet days in (a) DJF, (b) MAM, (c) JJA, and (d) SON. Color bubbles indicate location of the stations, sign and significance of the trend estimates. The numbers in the legends indicate fraction of the total number of stations (774) having such trend category. Background color indicates climatology of total number of wet days (in days), interpolated over the surface with values given by the underlying horizontal color legend.
2013glXXXXXXfs06.pdfPDF document2444KTrends (normalized w.r.t. climatology) of (a) extreme wet-season wet spell (WWS), and (c) extreme dry-season wet spell (DWS).
2013glXXXXXXfs07.pdfPDF document299KAnnual cycle of seasonal precipitation frequency within each 91-day window centered around the given day of year for a station located in the Great Plains (Lat = 40.43N, Long = 99.36W) where the wet season (represented by the wettest 91-day period) has shifted earlier by more than 3 weeks (~26 days) and the dry season 3 (represented by the driest 91-day period) shifted later by around 2 weeks (~13 days), as shown in Fig. 4. Blue (red) lines indicate the total number of wet days (after removing the annual mean) within each 91-day window, based upon the first (last) 40-year period of the observed record (1930-2009).
Supplementary_Material.pdfPDF document74KSupporting Information

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