Articles | Volume 26, issue 13
https://doi.org/10.5194/acp-26-9625-2026
https://doi.org/10.5194/acp-26-9625-2026
Research article
 | 
08 Jul 2026
Research article |  | 08 Jul 2026

Mesoscale modulation of marine boundary layer water vapor isotopologues during EUREC4A

Joseph Galewsky and Sebastian A. Los

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Isotopic measurements in water vapor, precipitation, and seawater during EUREC4A
Adriana Bailey, Franziska Aemisegger, Leonie Villiger, Sebastian A. Los, Gilles Reverdin, Estefanía Quiñones Meléndez, Claudia Acquistapace, Dariusz B. Baranowski, Tobias Böck, Sandrine Bony, Tobias Bordsdorff, Derek Coffman, Simon P. de Szoeke, Christopher J. Diekmann, Marina Dütsch, Benjamin Ertl, Joseph Galewsky, Dean Henze, Przemyslaw Makuch, David Noone, Patricia K. Quinn, Michael Rösch, Andreas Schneider, Matthias Schneider, Sabrina Speich, Bjorn Stevens, and Elizabeth J. Thompson
Earth Syst. Sci. Data, 15, 465–495, https://doi.org/10.5194/essd-15-465-2023,https://doi.org/10.5194/essd-15-465-2023, 2023
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Cited articles

Albright, A. L., Bony, S., Stevens, B., and Vogel, R.: Observed subcloud-layer moisture and heat budgets in the trades, J. Atmos. Sci., 79, 2363–2385, https://doi.org/10.1175/JAS-D-21-0337.1, 2022. a, b, c
Bailey, A., Aemisegger, F., Villiger, L., Los, S. A., Reverdin, G., Quinones Melendez, E., Diekmann, C. J., Galewsky, J., Noone, D., Schneider, A., and Schneider, M.: EUREC4A-iso: Full collection of isotopic measurements in water vapor, precipitation, and seawater during EUREC4A, AERIS, https://doi.org/10.25326/418, 2022. a
Bailey, A., Aemisegger, F., Villiger, L., Los, S. A., Reverdin, G., Quiñones Meléndez, E., Acquistapace, C., Baranowski, D. B., Böck, T., Bony, S., Bordsdorff, T., Coffman, D., de Szoeke, S. P., Diekmann, C. J., Dütsch, M., Ertl, B., Galewsky, J., Henze, D., Makuch, P., Noone, D., Quinn, P. K., Rösch, M., Schneider, A., Schneider, M., Speich, S., Stevens, B., and Thompson, E. J.: Isotopic measurements in water vapor, precipitation, and seawater during EUREC4A, Earth Syst. Sci. Data, 15, 465–495, https://doi.org/10.5194/essd-15-465-2023, 2023. a, b
Benetti, M., Aloisi, G., Reverdin, G., Risi, C., and Seze, G.: Importance of boundary layer mixing for the isotopic composition of surface vapor over the subtropical North Atlantic Ocean, J. Geophys. Res.-Atmos., 120, 2190-2209, https://doi.org/10.1002/2014JD021947, 2015. a
Bony, S. and Dufresne, J.-L.: Marine boundary layer clouds at the heart of tropical cloud feedback uncertainties in climate models, Geophys. Res. Lett., 32, L20806, https://doi.org/10.1029/2005GL023851, 2005. a
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This study shows that organized air motions over the tropical ocean can strongly shape the character of near-surface water vapor, even when overall moisture changes little. By combining ship and aircraft measurements with a simple physical model, we found that rising air can offset drying from mixing with air above, leaving a clear chemical fingerprint. These results help explain why clouds persist and improve how climate models represent them.
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