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Communication Dans Un Congrès Année : 2021

Isotopic measurements trace convection over the Asian and North American monsoons

Sergey Khaykin

Résumé

In-situ measurements of the HDO/H2O isotopic ratio in water vapor trace remnants of outflow from convective systems. We report here on isotopic measurements in the Upper Troposphere / Lower Stratosphere (UT/LS) region from the Chicago Water Isotope Spectrometer (ChiWIS) during two high-altitude aircraft campaigns sampling the Asian and North American monsoons (StratoClim, summer 2017, and ACCLIP, summer 2021). Convective transport of water vapor in the two monsoons is thought to be very different, and satellite measurements suggest stronger isotopic enhancements over the North American monsoon. This dataset allows the first direct comparison of their isotopic signatures from in-situ measurements. The Asian Monsoon shows strong variation between more- and less-convective time periods, convective influence to 400 K, and extensive reformation of secondary cirrus in air moistened by prior convection. We anticipate that analogous measurements over the North American monsoon will show more isolated convection to higher potential temperatures, with heavier isotopic signatures and no secondary cirrus formation. Differences in convective transport traced by water isotopes can provide insight into other chemical tracers and chemical process involving short-lived species with origins at the surface.
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Dates et versions

insu-04465691 , version 1 (19-02-2024)

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Benjamin Clouser, Clare Singer, Sergey Khaykin, Martina Kramer, Alexey Lykov, et al.. Isotopic measurements trace convection over the Asian and North American monsoons. AGU Fall Meeting 2021, Dec 2021, New Orleans, United States. pp.id. A25A-05. ⟨insu-04465691⟩
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