Shifting seasonality and increasing frequency of precipitation in wet and dry seasons across the U.S.
Article first published online: 2 AUG 2013
©2013. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 15, pages 4030–4035, 16 August 2013
How to Cite
2013), Shifting seasonality and increasing frequency of precipitation in wet and dry seasons across the U.S., Geophys. Res. Lett., 40, 4030–4035, doi:10.1002/grl.50760., , , and (
- Issue published online: 28 AUG 2013
- Article first published online: 2 AUG 2013
- Accepted manuscript online: 19 JUL 2013 05:36AM EST
- Manuscript Accepted: 13 JUL 2013
- Manuscript Received: 25 JUN 2013
- National Science Foundation. Grant Number: AGS-0958907
- Department of Energy. Grant Number: DE-SC0006914
Additional supporting information may be found in the online version of this article.
|2013glXXXXXXfs01.pdf||PDF document||108K||Boxplots 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.pdf||PDF document||3028K||Trends (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.pdf||PDF document||606K||Difference 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.pdf||PDF document||11953K||Trends (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.pdf||PDF document||3404K||Trends (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.pdf||PDF document||2444K||Trends (normalized w.r.t. climatology) of (a) extreme wet-season wet spell (WWS), and (c) extreme dry-season wet spell (DWS).|
|2013glXXXXXXfs07.pdf||PDF document||299K||Annual 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.pdf||PDF document||74K||Supporting Information|
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