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@ARTICLE{Diekmann:1043669,
      author       = {Diekmann, Christopher Johannes and Schneider, Matthias and
                      Knippertz, Peter and Trent, Tim and Boesch, Hartmut and
                      Roehling, Amelie Ninja and Worden, John and Ertl, Benjamin
                      and Khosrawi, Farahnaz and Hase, Frank},
      title        = {{W}ater vapour isotopes over {W}est {A}frica as observed
                      from space: which processes control tropospheric {H} 2 {O}
                      ∕ {HDO} pair distributions?},
      journal      = {Atmospheric chemistry and physics},
      volume       = {25},
      number       = {11},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2025-02969},
      pages        = {5409 - 5431},
      year         = {2025},
      abstract     = {The West African Monsoon (WAM) is crucial for rainfall in
                      West Africa, impacting socio-economic conditions. Its
                      complexity arises from interactions between large-scale
                      circulation, convective dynamics, and microphysical
                      processes, making it challenging to disentangle individual
                      contributions to the hydrological cycle.Recent advances in
                      retrieving the isotopic composition of tropospheric water
                      vapour from space promote the paired analysis of H2O and HDO
                      to study atmospheric moisture pathways and processes. Using
                      data from the satellite instruments IASI (Infrared
                      Atmospheric Sounding Interferometer), AIRS (Atmospheric
                      Infrared Sounder) and TROPOMI (Tropospheric Monitoring
                      Instrument), along with the IMERG (Integrated
                      Multi-Satellite Retrievals for GPM) precipitation product,
                      we analyse the variability of H2O and HDO (given as δD)
                      over West Africa at convective and seasonal scales. Key
                      findings include the following: (1) monsoon convection over
                      the Sahel induces an anti-correlation between H2O and δD in
                      the mid-troposphere. This is due to dry intrusions from the
                      Saharan upper troposphere into Sahelian squall lines,
                      fostering rain evaporation and mid-tropospheric δD
                      depletion. (2) Over the Guinea coast, convective
                      precipitation is associated with moist and enriched signals,
                      with surface evaporation from the tropical Atlantic reducing
                      rain evaporation and δD depletion. (3) During the Sahelian
                      monsoon peak, an anti-correlation between precipitation and
                      δD forms year to year, indicating the amount effect in
                      tropospheric water vapour. (4) In the Sahelian winter, when
                      precipitation is minimal, {H2O, δD} signals point to mixing
                      of dry air masses of different origins.This study is the
                      first to apply comprehensive isotopic datasets from IASI,
                      TROPOMI and AIRS to the WAM, demonstrating the utility of
                      satellite-based {H2O, δD} pairs in detecting impacts of
                      microphysical and dynamical processes on water vapour
                      isotopic composition.},
      cin          = {JSC},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / DFG project
                      G:(GEPRIS)416767181 - TEsten von Isotopologen als
                      Diabatischer Heizratenindikator für atmosphärische
                      DatenanalYsen (416767181) / DFG project G:(GEPRIS)290612604
                      - Transportwege von Feuchte und Wasserdampfisotopologe
                      (290612604)},
      pid          = {G:(DE-HGF)POF4-5111 / G:(GEPRIS)416767181 /
                      G:(GEPRIS)290612604},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001499535100001},
      doi          = {10.5194/acp-25-5409-2025},
      url          = {https://juser.fz-juelich.de/record/1043669},
}