reference : Precipitation deficit flash droughts over the United States

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/reference/adb5b34f-6330-4552-be26-24723fb15d44
Bibliographic fields
reftype Journal Article
Abstract Flash drought refers to relatively short periods of warm surface temperature and anomalously low and rapid decreasing soil moisture (SM). Based on the physical mechanisms associated with flash droughts, these events are classified into two categories: heat wave and precipitation P deficit flash droughts. In previous work, the authors have defined heat wave flash droughts as resulting from the confluence of severe warm air temperature Tair, which increases evapotranspiration (ET), and anomalously low and decreasing SM. Here, a second type of flash drought caused by precipitation deficits is explored. The authors term these events P-deficit flash droughts, which they associate with lack of P. Precipitation deficits cause ET to decrease and temperature to increase. The P-deficit flash droughts are analyzed based on observations of P, Tair, and SM and ET reconstructed using land surface models for the period 1916–2013. The authors find that P-deficit flash droughts are more common than heat wave flash droughts. They are about twice as likely to occur as heat wave flash droughts over the conterminous United States. They are most prevalent over the southern United States with maxima over the southern Great Plains and the Southwest, in contrast to heat wave flash droughts that are mostly likely to occur over the Midwest and the Pacific Northwest, where the vegetation cover is dense.
Author Kingtse C. Mo; Dennis P. Lettenmaier
DOI 10.1175/jhm-d-15-0158.1
Issue 4
Journal Journal of Hydrometeorology
Keywords Atm/Ocean Structure/ Phenomena,Drought,Extreme events,Applications,Agriculture
Pages 1169-1184
Title Precipitation deficit flash droughts over the United States
Volume 17
Year 2016
Bibliographic identifiers
.reference_type 0
_record_number 20929
_uuid adb5b34f-6330-4552-be26-24723fb15d44