--- _id: '9126' abstract: - lang: eng text: The goal of this study is to understand the mechanisms controlling the isotopic composition of the water vapor near the surface of tropical oceans, at the scale of about a hundred kilometers and a month. In the tropics, it has long been observed that the isotopic compositions of rain and vapor near the surface are more depleted when the precipitation rate is high. This is called the “amount effect.” Previous studies, based on observations or models with parameterized convection, have highlighted the roles of deep convective and mesoscale downdrafts and rain evaporation. But the relative importance of these processes has never been quantified. We hypothesize that it can be quantified using an analytical model constrained by large‐eddy simulations. Results from large‐eddy simulations confirm that the classical amount effect can be simulated only if precipitation rate changes result from changes in the large‐scale circulation. We find that the main process depleting the water vapor compared to the equilibrium with the ocean is the fact that updrafts stem from areas where the water vapor is more enriched. The main process responsible for the amount effect is the fact that when the large‐scale ascent increases, isotopic vertical gradients are steeper, so that updrafts and downdrafts deplete the subcloud layer more efficiently. article_number: e2020MS002106 article_processing_charge: No article_type: original author: - first_name: Camille full_name: Risi, Camille last_name: Risi - first_name: Caroline J full_name: Muller, Caroline J id: f978ccb0-3f7f-11eb-b193-b0e2bd13182b last_name: Muller orcid: 0000-0001-5836-5350 - first_name: Peter full_name: Blossey, Peter last_name: Blossey citation: ama: Risi C, Muller CJ, Blossey P. What controls the water vapor isotopic composition near the surface of tropical oceans? Results from an analytical model constrained by large‐eddy simulations. Journal of Advances in Modeling Earth Systems. 2020;12(8). doi:10.1029/2020ms002106 apa: Risi, C., Muller, C. J., & Blossey, P. (2020). What controls the water vapor isotopic composition near the surface of tropical oceans? Results from an analytical model constrained by large‐eddy simulations. Journal of Advances in Modeling Earth Systems. American Geophysical Union. https://doi.org/10.1029/2020ms002106 chicago: Risi, Camille, Caroline J Muller, and Peter Blossey. “What Controls the Water Vapor Isotopic Composition near the Surface of Tropical Oceans? Results from an Analytical Model Constrained by Large‐eddy Simulations.” Journal of Advances in Modeling Earth Systems. American Geophysical Union, 2020. https://doi.org/10.1029/2020ms002106. ieee: C. Risi, C. J. Muller, and P. Blossey, “What controls the water vapor isotopic composition near the surface of tropical oceans? Results from an analytical model constrained by large‐eddy simulations,” Journal of Advances in Modeling Earth Systems, vol. 12, no. 8. American Geophysical Union, 2020. ista: Risi C, Muller CJ, Blossey P. 2020. What controls the water vapor isotopic composition near the surface of tropical oceans? Results from an analytical model constrained by large‐eddy simulations. Journal of Advances in Modeling Earth Systems. 12(8), e2020MS002106. mla: Risi, Camille, et al. “What Controls the Water Vapor Isotopic Composition near the Surface of Tropical Oceans? Results from an Analytical Model Constrained by Large‐eddy Simulations.” Journal of Advances in Modeling Earth Systems, vol. 12, no. 8, e2020MS002106, American Geophysical Union, 2020, doi:10.1029/2020ms002106. short: C. Risi, C.J. Muller, P. Blossey, Journal of Advances in Modeling Earth Systems 12 (2020). date_created: 2021-02-15T14:06:38Z date_published: 2020-08-01T00:00:00Z date_updated: 2022-01-24T12:28:12Z day: '01' doi: 10.1029/2020ms002106 extern: '1' intvolume: ' 12' issue: '8' keyword: - Global and Planetary Change - General Earth and Planetary Sciences - Environmental Chemistry language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1029/2020MS002106 month: '08' oa: 1 oa_version: Published Version publication: Journal of Advances in Modeling Earth Systems publication_identifier: issn: - 1942-2466 - 1942-2466 publication_status: published publisher: American Geophysical Union quality_controlled: '1' status: public title: What controls the water vapor isotopic composition near the surface of tropical oceans? Results from an analytical model constrained by large‐eddy simulations type: journal_article user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9 volume: 12 year: '2020' ...