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Title: Evaluating a Moist Isentropic Framework for Poleward Moisture Transport: Implications for Water Isotopes Over Antarctica

Abstract

The ability to identify moisture source regions and sinks, and to model the transport pathways that link them in simple yet physical ways, is critical for our understanding of climate today and in the past. Using water tagging and isotopic tracer experiments in the Community Earth System Model, combined with theoretical arguments, this work provides compelling evidence of the utility of a moist isentropic view of poleward moisture transport. Importantly, because conservation of moist entropy requires that air masses trade sensible and latent heat for potential energy, the moist isentropic framework provides strong energetic constraints on the atmosphere's effective rainout, which the isotope ratios of water vapor and precipitation record. The analysis confirms not only that distinct zonal bands supply moisture to high- and low-elevation polar sites, but also that changes in these source regions are inextricably linked to changes in temperature and rainout.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. National Center for Atmospheric Research, Boulder, CO (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Victoria, Victoria, British Columbia (Canada). School of Earth and Ocean Sciences
  3. NASA Goddard Inst. for Space Studies, New York, NY (United States); Columbia Univ., New York, NY (United States). Center for Climate Systems Research
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1571490
Report Number(s):
PNNL-SA-142244
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 13; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; moist entropy; moisture transport; moisture sources and sinks; water isotopes; water tags; Antarctica

Citation Formats

Bailey, Adriana, Singh, Hansi K. A., and Nusbaumer, Jesse. Evaluating a Moist Isentropic Framework for Poleward Moisture Transport: Implications for Water Isotopes Over Antarctica. United States: N. p., 2019. Web. doi:10.1029/2019GL082965.
Bailey, Adriana, Singh, Hansi K. A., & Nusbaumer, Jesse. Evaluating a Moist Isentropic Framework for Poleward Moisture Transport: Implications for Water Isotopes Over Antarctica. United States. doi:10.1029/2019GL082965.
Bailey, Adriana, Singh, Hansi K. A., and Nusbaumer, Jesse. Thu . "Evaluating a Moist Isentropic Framework for Poleward Moisture Transport: Implications for Water Isotopes Over Antarctica". United States. doi:10.1029/2019GL082965. https://www.osti.gov/servlets/purl/1571490.
@article{osti_1571490,
title = {Evaluating a Moist Isentropic Framework for Poleward Moisture Transport: Implications for Water Isotopes Over Antarctica},
author = {Bailey, Adriana and Singh, Hansi K. A. and Nusbaumer, Jesse},
abstractNote = {The ability to identify moisture source regions and sinks, and to model the transport pathways that link them in simple yet physical ways, is critical for our understanding of climate today and in the past. Using water tagging and isotopic tracer experiments in the Community Earth System Model, combined with theoretical arguments, this work provides compelling evidence of the utility of a moist isentropic view of poleward moisture transport. Importantly, because conservation of moist entropy requires that air masses trade sensible and latent heat for potential energy, the moist isentropic framework provides strong energetic constraints on the atmosphere's effective rainout, which the isotope ratios of water vapor and precipitation record. The analysis confirms not only that distinct zonal bands supply moisture to high- and low-elevation polar sites, but also that changes in these source regions are inextricably linked to changes in temperature and rainout.},
doi = {10.1029/2019GL082965},
journal = {Geophysical Research Letters},
number = 13,
volume = 46,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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