Stable isotopes in water vapor and rainwater over Indian sector of Southern Ocean and estimation of fraction of recycled moisture

Scientific Reports
P RahulKei Yoshimura

Abstract

Stable Hydrogen and Oxygen isotopic composition of water vapor, rainwater and surface seawater show a distinct trend across the latitude over the Southern Indian Ocean. Our observations on isotopic composition of surface seawater, water vapor and rainwater across a transect covering the tropical Indian Ocean to the regions of the Southern Ocean showed a strong latitudinal dependency; characterized by the zonal process of evaporation and precipitation. The sampling points were spread across diverse zones of SST, wind speed and rainfall regimes. The observed physical parameters such as sea surface temperature, wind speed and relative humidity over the oceanic regions were used in a box model calculation across the latitudes to predict the isotopic composition of water vapor under equilibrium and kinetic conditions, and compared with results from isotope enabled global spectral model. Further, we obtained the average fraction of recycled moisture across the oceanic transect latitudes as 13.4 ± 7.7%. The values of recycled fraction were maximum at the vicinity of the Inter Tropical Convergence Zone (ITCZ), while the minimum values were recorded over the region of subsidence and evaporation, at the Northern and Southern latitudes of...Continue Reading

References

Feb 3, 2007·Nature·John WordenUNKNOWN Tropospheric Emission Spectrometer Science Team and Data contributors
Aug 18, 2010·Proceedings of the National Academy of Sciences of the United States of America·Jiping Liu, Judith A Curry

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Citations

May 14, 2020·Proceedings. Mathematical, Physical, and Engineering Sciences·Graeme L StephensRemy Rocca

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Methods Mentioned

BETA
equilibrium fractionation

Software Mentioned

IsoGSM
ENVISAT
HYSPLIT
GRaDS

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