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Corpus Systématique Végétale

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Reconstruction of false spring occurrences over the southeastern United States, 19012007:an increasing risk of spring freeze damage?

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  • false spring
  • start of the growing season (SGS)
  • phenology
  • minimum temperature
  • deciduous forest
  • growing degree days (GDD)
  • last hard freeze
  • Global Historical Climatology Network (GHCN)
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  • Garrett P Marino 1,2,3
  • Dale P Kaiser 2,4
  • Lianhong Gu 2
  • Daniel M Ricciuto 2
  • 1) Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
  • 2) Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
  • 3) Present address: Edison Mission Marketing and Trading, Boston, MA, USA
  • 4) Author to whom any correspondence should be addressed

Near-record warmth over much of the United States during March 2007 promoted early growthof crops and vegetation. A widespread arctic air outbreak followed in early April, resultingin extensive agricultural losses over much of the south-central and southeastern US. Thisfalse spring event also resulted in widespread damage to newly grown tissues of nativedeciduous forest species, shown by previous researchers to have had measurable effects onthe terrestrial carbon cycle. The current study reconstructed the historical occurrence offalse springs over most of the southeastern quarter of the conterminous US (3239N; 7598W) from 1901 to 2007 using daily maximum and minimum temperature records from 176stations in the Global Historical Climatology Network database, and enhanced vegetationindex (EVI) data derived from Moderate Resolution Imaging Spectroradiometer(MODIS) satellite observations. A false spring index was derived that examined thetiming of the start of the growing season (SGS), or leaf emergence, relative tothe timing of a potentially damaging last hard freeze (minimum temperature 2.2C). SGS was modeled for the domain by combining EVI data with ground-basedtemperature degree day calculations reflecting the rate of springtime warming. Nosignificant area-wide, long-term SGS trend was found; however, over much of a contiguousregion stretching from Mississippi eastward to the Carolinas, the timing of the last hardfreeze was found to occur significantly later, this change occurring along with increasedfrequency of false springs. Earlier last hard freeze dates and decreased frequency of falsesprings were found over much of the northwestern part of the study region, includingArkansas and southern Missouri.

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  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vertebres: systeme nerveux et organes des sens
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Public Health, Environmental and Occupational Health
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Physical Sciences ; 2 - Energy ; 3 - Renewable Energy, Sustainability and the Environment
Catégories WoS
  • 1 - science ; 2 - meteorology & atmospheric sciences
  • 1 - science ; 2 - environmental sciences
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Environmental Research Letters

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