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Identifying Recharge from Tropical Cyclonic Storms, Baja California Sur, Mexico

Eastoe, Christopher J.

GROUNDWATER volume 53 issue S1 page 133 -- John Wiley & Sons, Inc.

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  • Title:
    Identifying Recharge from Tropical Cyclonic Storms, Baja California Sur, Mexico
  • Author: Eastoe, Christopher J.;
    Hess, Greg;
    Mahieux, Susana
  • Found In: GROUNDWATER volume 53 issue S1 page 133
  • Rights: LegalDeposit; Reading Room Access
  • Publication Details: John Wiley & Sons, Inc.
  • Abstract: Abstract

    Groundwater in the Todos Santos watershed in southern Baja California, and throughout the peninsula south of latitude 28°N, has values of (δ18O‰, δD‰) ranging between (−8.3, −57) and (−10.9, −78). Such negative values are uncharacteristic of the site latitude near the sea level. Altitude effects do not explain the isotope data. Tropical depressions originating along the Pacific coast of North America yield rain with isotopic depletion; rain from these weather systems in southern Arizona commonly has δ18O values < −10‰ in comparison with amount‐weighted mean summer and fall rain at −6‰. Isotope data indicate hurricane rain as the predominant source of recharge in southern Baja California, where named tropical depressions bring large rains (>50 mm) at least once every 2 to 3 years, and along the Pacific coast between Jalisco and Oaxaca.


  • Identifier: Journal ISSN: 1745-6584
  • Publication Date: 2014-03-17
  • Physical Description: Electronic

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