The Influence of Convective Aggregation on the Stable Isotopic Composition of Water Vapor
Name
AGU Advances - 2023 - Galewsky - The Influence of Convective Aggregation on the Stable Isotopic Composition of Water Vapor.pdf
Description
Published version
Size
2.67 MB
Format
Adobe PDF
Checksum (MD5)
6248ebb483981843054d32135880ab30
Author(s)
Galewsky, Joseph
Schneider, Matthias
Diekmann, Christopher
Semie, Addisu
Bony, Sandrine
Risi, Camille
Emanuel, Kerry
Brogniez, Helene
Date Issued
September 6, 2023
Journal
AGU Advances
Publisher
American Geophysical Union
Citation
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.
Version
Final published version
Abstract
Remote sensing datasets of water vapor isotopic composition are used along with objective measures of convective aggregation to better understand the impact of convective aggregation on the atmospheric hydrologic cycle in the global tropics (30°N to 30°S) for the period 2015–2020. When convection is unaggregated, vertical velocity profiles are top-heavy, mixing ratios increase and water vapor δD decreases as the mean precipitation rate increases, consistent with partial hydrometeor evaporation below anvils into a relatively humid atmospheric column. Aggregated convection is associated with bottom-heavy vertical velocity profiles and a positive correlation between mixing ratio and δD, a result that is consistent with isotopic enrichment from detrainment of shallow convection near the observation level. Intermediate degrees of aggregation do not display significant variation in δD with mixing ratio or precipitation rate. Convective aggregation provides a useful paradigm for understanding the relationships between mixing ratio and isotopic composition across a range of convective settings. The results presented here may have utility for a variety of applications including the interpretation of paleoclimate archives and the evaluation of numerical simulations of convection.
MIT Department
Lorenz Center (Massachusetts Institute of Technology)
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivatives
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/2023av000877
