Spatiotemporal variability of meteorological droughts in southeastern USA
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Droughts in the southeast USA have been linked to economic losses and intractable water conflicts. The region has witnessed several severe droughts events during the period from 1901 to 2005. In this study, spatiotemporal variability in meteorological drought characteristics in the southeast were analyzed using two different datasets by the means of standard precipitation index and standard precipitation evapotranspiration index for the period 1901–2005 for agricultural and non-agricultural seasons. The study periods were divided into three epochs 1901–1935, 1936–1970, and 1971–2005 and drought characteristics, in terms of severity, frequency, number, and trends were analyzed. Additionally, areal extent, drought severities and return periods associated with three severe drought years 1904, 1954, and 2000 were analyzed. Except for the state of Florida, results indicate decrease in drought severity during the recent epoch of 1970–2005 in the study domain. Trend analysis confirms that the study domain has become wetter over the last 105 years. Wetting trends were more prominent in the agricultural season. Additionally, droughts seem to have migrated from the western part of the study area encompassing the states of Alabama, Tennessee, Louisiana, and Mississippi to the Florida panhandle region during the recent epoch. Droughts exhibited higher spatiotemporal variability during the agricultural season compared to the non-agricultural seasons. Results also showed that early to mid-1950s experienced some of the most severe droughts in the study domain. Some of the drought events, such as the drought of 1954 and 2000, have been equivalent to a 100-year drought event in the southeast. The results from this study form the benchmark for studying the impacts of future climate change projections on meteorological droughts in the southeast.
KeywordsDroughts SPI SPEI SAF curves Southeast USA
The authors wish to acknowledge the funding provided by the National Integrated Drought Information System (NIDIS), the National Oceanic and Atmospheric Agency (NOAA) Sectoral Applications Research Program (SARP), and the NOAA Regional Integrated Sciences and Assessments (RISA) Program for this study.
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Conflict of interest
The authors declare that they have no conflict of interest.
- Benjamini Y, Hochberg Y (1995) Controlling the false discovery rate: a practical and powerful approach to multiple testing. J R Stat Soc B Methodol 57:289–300. http://www.stat.purdue.edu/~doerge/BIOINFORM.D/FALL06/Benjamini%20and%20Y%20FDR.pdf Google Scholar
- Edwards DC, Mckee TB (1997) Characteristics of 20th century drought in the United States at multiple time scales. Climatology Report No. 97-2Google Scholar
- Ganguli P, Ganguly AR (2016) Space-time trends in U.S. meteorological droughts. J Hydrol Regional Stud 8:235–259Google Scholar
- Henriques AG, Santos MJJ (1999) Regional drought distribution model. Phys Chem Earth Part B: Hydrol Oceans Atmos 24(1–2):19–22Google Scholar
- IPCC (Intergovernmental Panel on Climate Change) (2013) The physical science basis. In: Stocker TF, Qin D, Plattner G-K, Tignor M, Allen SK, Boschung J, Nauels A, Xia Y, Bex V, Midgley PM (Eds.) Working Group I contribution to the fifth assessment report of the intergovernmental panel on climate change. CambridgeGoogle Scholar
- Kulkarni A, von Storch H (1995) Monte Carlo experiments on the effect of serial correlation on the Mann–Kendall test of trend. Meteorol Z 4:82–85Google Scholar
- Lott N, Ross T (2006) Tracking and evaluating US billion-dollar weather disasters, 1980–2005. Preprints, AMS forum: environmental risk and impacts on society: success and challenges. Atlanta, Amer. Meteor. Soc., 1.2. http://ams.confex.com/ams/Annual2006/techprogram/paper_100686.htm
- McKee TB, Doesken NJ, Kleist J (1993) The relationship of drought frequency and duration to time scales. Proceedings of conference of applied climatology. American Meteorological Society, AnaheimGoogle Scholar
- Mishra AK, Singh VP (2009) Analysis of drought severity-area-frequency curves using a general circulation model and scenario uncertainty. J Geophys Res 114:(D6). doi: 10.1029/2008JD010986
- Mitra S, Srivastava P, Singh S, Yates D (2014) Effect of ENSO-induced climate variability on groundwater levels in the lower Apalachicola–Chattahoochee–Flint river basin. Trans ASABE 57:1393–1403Google Scholar
- NCADAC (2013) Third national climate assessment report: draft. US Global Change Research Program, Washington DCGoogle Scholar
- Southern Environmental Law Center (2013) Tri-state water wars (AL, GA, FL). https://www.southernenvironment.org/cases-andprojects/tri-state-water-wars-al-ga-fl. Accessed 17 Oct 2015