ISSN 1006-9895

CN 11-1768/O4

Study on East Asian Stable Isotopes in Atmospheric Water Vapor

Institute of Atmospheric Physics

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    Stable isotopes in atmospheric water vapor, which can track moisture sources and water vapor transport, are widely used as an important tracer of present-day water cycle. ‘‘Amount effect” is invoked to interpret water vapor stable isotopes at mid-low latitude monsoon region. However, recent studies have shown that non-local factors such as moisture sources and water vapor transport have significant influence on the stable isotopes. Therefore, based on Lagrangian Particle Dispersion Model and Satellite remote sensing δD in water vapor, the main factors affecting water vapor δD are analyzed in the region with abundant Chinese stalagmite δ18O records. On the seasonal scale, water vapor δD is more depleted in late summer and early autumn and enriched in winter and spring. We find this characteristic cannot interpret by "temperature effect" or "amount effect". On the contrary, accumulated rainfall over water vapor transport paths is the dominant factor of water vapor δD and there is a significant negative correlation between them. On the interannual scale, water vapor δD is enriched in the summer of El Ni?o year and depleted in the summer of La Ni?a year. The contribution of moisture sources to water vapor δD is small, but the accumulated rainfall over water vapor transport paths increases significantly in La Ni?a year compared with El Ni?o year. This suggests that tropical convection and depletion in water vapor transport paths are strong in La Ni?a year, resulting in depleted water vapor δD in the study area. In conclusion, upstream convection, measured by accumulated rainfall, is the primary driver of water vapor δD variations on seasonal to interannual scale. Enhanced convection will deplete δD in the study area, while the weakened convection is the opposite.

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  • Received:July 09,2021
  • Revised:September 23,2021
  • Adopted:September 29,2021
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