Speaker
Description
Tropospheric water vapour isotopologue ratios (expressed as δD) give unique insight into moisture sources and cloud processes, in particular if analysed together with the water vapour concentration.
In this presentation we briefly introduce the theoretical framework of generating {H2O,δD}-pair distributions and we present the MUSICA IASI {H2O,δD}-pair data set (1.5 billion individual data points, offering twice daily global coverage for 10/2014 to 12/2020, [1]). We present results from recent studies that document the potential of the MUSICA isotopologue data for validating the representation of cloud processes in atmospheric models [2-4].
Furthermore, we discuss the promising opportunities of the upcoming Metop-SG-A missions for generating tropospheric water vapour isotopologue profile data by combining the two sensors IASI-NG and Sentinel-5.
[1] Diekmann, C. J., Schneider, M., Ertl, B., Hase, F., García, O., Khosrawi, F., Sepúlveda, E., Knippertz, P., and Braesicke, P.: The global and multi-annual MUSICA IASI {H2O, δD} pair dataset, Earth Syst. Sci. Data, 13, 5273–5292, https://doi.org/10.5194/essd-13-5273-2021, 2021.
[2] Galewsky, J., Schneider, M., Diekmann, C., Semie, A., Bony, S., Risi, C., et al. (2023). The influence of convective aggregation on the stable isotopic composition of water vapor. AGU Advances, 4, e2023AV000877. https://doi.org/10.1029/2023AV000877
[3] Schneider, M., Toride, K., Khosrawi, F., Hase, F., Ertl, B., Diekmann, C. J., and Yoshimura, K.: Assessing the potential of free tropospheric water vapour isotopologue satellite observations for improving the analyses of convective events, accepted for Atmos. Meas. Tech., June 2024, AMTD version: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-1121/
[4] Diekmann, C. J., Schneider, M., Knippertz, P., Trent, T., Boesch, H., Roehling. A. J., Worden, J., Ertl, B., Khosrawi, F., and Hase, F.: Water vapour isotopes over West Africa as observed from space: which processes control tropospheric H2O/HDO pair distributions?, submitted to Atmos. Chem. Phys., May 2024.
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