Stable isotope signatures of seasonal precipitation on the Pacific coast of central Panama

Zoltán Kern, Russell S. Harmon, I. Fórizs

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

As calculated from data archived in the IAEA-WMO Global Network of Isotopes in Precipitation programme, the amount-weighted local meteoric water line for the Pacific coast of central Panama is: δ2H = 7.63(±0.08) × δ18O + 6.51(±0.49). Amount-weighted mean isotopic values were regressed against the sea surface temperature (SST) fields of the adjacent tropical oceans. A negative correlation of precipitation isotope composition with Caribbean SSTs is observed only for the early wet season (May–June), whilst the mid-summer dry period is characterized by positive correlation with eastern Pacific SSTs, similar to the late wet season (October–November). The negative response of May–June rainfall isotopic composition to Caribbean SSTs is explained by a SST-mediated change in stratiform rain fraction from organized convective systems proximal to the Inter Tropical Convergence Zone (ITCZ). The positive correlation for the rest of the wet season, when the organized convective zone of ITCZ and its attached stratiform belt are distant from the Pacific coast of Panama, is interpreted as simple evaporative temperature effect on isotopic fractionation.

Original languageEnglish
JournalIsotopes in Environmental and Health Studies
DOIs
Publication statusAccepted/In press - Mar 11 2015

Fingerprint

Isotopes
Rain
Coastal zones
stable isotope
sea surface temperature
Water piping systems
wet season
coast
Fractionation
Chemical analysis
Thermal effects
intertropical convergence zone
Temperature distribution
isotope
convective system
isotopic fractionation
meteoric water
temperature effect
shoreline
isotopic composition

Keywords

  • evaporation
  • hydrogen-2
  • isotope fractionation
  • isotope hydrology
  • meteoric water line
  • ocean
  • oxygen-18
  • Panama
  • precipitation
  • tropical hydrometeorology

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Stable isotope signatures of seasonal precipitation on the Pacific coast of central Panama. / Kern, Zoltán; Harmon, Russell S.; Fórizs, I.

In: Isotopes in Environmental and Health Studies, 11.03.2015.

Research output: Contribution to journalArticle

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KW - oxygen-18

KW - Panama

KW - precipitation

KW - tropical hydrometeorology

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