Articles written in Journal of Earth System Science

    • Linking variability of monsoon precipitation with satellite-based observations of stable water isotopes over Northeast India


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      Isotopic composition of atmospheric water vapor provides information on transport, mixing and phase change of water in the atmosphere. It provides a useful tool for understanding various aspects of the hydrological cycle. SCanning Imaging Absorption Spectrometer for Atmospheric CHartographY (SCIAMACHY) onboard ENVISAT-1 was a spectrometer designed to measure the composition of trace gases in troposphere and stratosphere. It provided global measurements of total columnar HDO and $H_{2}O$ concentrations using the spectral window between 2338.5 and 2382.5 nm. Temporal variability of columnar $\delta\rm{D}$ was studied over Northeast (NE) India and mean columnar $\delta\rm{D}$ for pre-monsoon and monsoon months were correlated with precipitation data obtained from Global System for Mapping of Precipitation (GSMaP). It was observed that $\delta\rm{D}$ during the pre-monsoon months of April–May showed good correlation ($r$ > 0.7, $p$ < 0.05) with total precipitation during June–August for the corresponding year over forested regions of Meghalaya and parts of Assam. Analysis was also carried out to understand the relationship between SCIAMACHY derived gridded monthly $\delta\rm{D}$ and Multivariate El-Ni$\tilde{n}$o Index (MEI) with zero and one month lag periods. Positive correlation was observed between $\delta\rm{D}$ and MEI over parts of Central India, Myanmar and Thailand. Isotope ratio of water vapor provides additional information compared to traditional meteorological observations and holds the potential to improve forecasting models.

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