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Title: A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO 2 Doubling

Abstract

Numerical water tracers implemented in a global climate model are used to study how polar hydroclimate responds to CO 2 -induced warming from a source–receptor perspective. Although remote moisture sources contribute substantially more to polar precipitation year-round in the mean state, an increase in locally sourced moisture is crucial to the winter season polar precipitation response to greenhouse gas forcing. In general, the polar hydroclimate response to CO 2 -induced warming is strongly seasonal: over both the Arctic and Antarctic, locally sourced moisture constitutes a larger fraction of the precipitation in winter, while remote sources become even more dominant in summer. Increased local evaporation in fall and winter is coincident with sea ice retreat, which greatly augments local moisture sources in these seasons. In summer, however, larger contributions from more remote moisture source regions are consistent with an increase in moisture residence times and a longer moisture transport length scale, which produces a robust hydrologic cycle response to CO 2 -induced warming globally. The critical role of locally sourced moisture in the hydrologic cycle response of both the Arctic and Antarctic is distinct from controlling factors elsewhere on the globe; for this reason, great care should be taken in interpretingmore » polar isotopic proxy records from climate states unlike the present.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington
  2. Department of Atmospheric Sciences, University of Washington, Seattle, Washington
  3. Applied Physics Laboratory, University of Washington, Seattle, Washington
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1409718
Grant/Contract Number:  
Linus Pauling Distinguished Postdoctoral Fellowship
Resource Type:
Published Article
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Name: Journal of Climate Journal Volume: 30 Journal Issue: 24; Journal ID: ISSN 0894-8755
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English

Citation Formats

Singh, Hansi K. A., Bitz, Cecilia M., Donohoe, Aaron, and Rasch, Philip J. A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO 2 Doubling. United States: N. p., 2017. Web. doi:10.1175/JCLI-D-16-0917.1.
Singh, Hansi K. A., Bitz, Cecilia M., Donohoe, Aaron, & Rasch, Philip J. A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO 2 Doubling. United States. doi:10.1175/JCLI-D-16-0917.1.
Singh, Hansi K. A., Bitz, Cecilia M., Donohoe, Aaron, and Rasch, Philip J. Fri . "A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO 2 Doubling". United States. doi:10.1175/JCLI-D-16-0917.1.
@article{osti_1409718,
title = {A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO 2 Doubling},
author = {Singh, Hansi K. A. and Bitz, Cecilia M. and Donohoe, Aaron and Rasch, Philip J.},
abstractNote = {Numerical water tracers implemented in a global climate model are used to study how polar hydroclimate responds to CO 2 -induced warming from a source–receptor perspective. Although remote moisture sources contribute substantially more to polar precipitation year-round in the mean state, an increase in locally sourced moisture is crucial to the winter season polar precipitation response to greenhouse gas forcing. In general, the polar hydroclimate response to CO 2 -induced warming is strongly seasonal: over both the Arctic and Antarctic, locally sourced moisture constitutes a larger fraction of the precipitation in winter, while remote sources become even more dominant in summer. Increased local evaporation in fall and winter is coincident with sea ice retreat, which greatly augments local moisture sources in these seasons. In summer, however, larger contributions from more remote moisture source regions are consistent with an increase in moisture residence times and a longer moisture transport length scale, which produces a robust hydrologic cycle response to CO 2 -induced warming globally. The critical role of locally sourced moisture in the hydrologic cycle response of both the Arctic and Antarctic is distinct from controlling factors elsewhere on the globe; for this reason, great care should be taken in interpreting polar isotopic proxy records from climate states unlike the present.},
doi = {10.1175/JCLI-D-16-0917.1},
journal = {Journal of Climate},
number = 24,
volume = 30,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1175/JCLI-D-16-0917.1

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