---
_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'
...