Future Changes of Subseasonal Precipitation Variability in North America During Winter Under Global Warming
Abstract
Abstract Changes in subseasonal precipitation variability have important implications for predictability of weather and climate extreme. Here we explore the mechanisms that lead to future changes in subseasonal precipitation variability in North America during winter based on 20 state‐of‐the‐art climate models. Modeling evidences indicate that in a warmer climate, the subseasonal precipitation variability consistently increases over most of North America, with intensified swing between the wet and dry extremes, but declines over Mexico. Using a moisture budget decomposition framework, two opposing mechanisms are established: the thermodynamic component from increasing moisture due to global warming intensifies the subseasonal precipitation variability, while the dynamic component from the projected reduction in subseasonal rainfall‐related circulation variability has an opposite effect. Overall, the thermodynamic effect wins the tug of war at the mid‐to‐high latitudes over most of North America, while the dynamic effect overwhelms the thermodynamic effect in Mexico, creating distinct changes in subseasonal precipitation variability.
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1497678
- Alternate Identifier(s):
- OSTI ID: 1487162
- Report Number(s):
- PNNL-SA-136949
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 22; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Dong, Lu, Leung, L. Ruby, and Song, Fengfei. Future Changes of Subseasonal Precipitation Variability in North America During Winter Under Global Warming. United States: N. p., 2018.
Web. doi:10.1029/2018GL079900.
Dong, Lu, Leung, L. Ruby, & Song, Fengfei. Future Changes of Subseasonal Precipitation Variability in North America During Winter Under Global Warming. United States. https://doi.org/10.1029/2018GL079900
Dong, Lu, Leung, L. Ruby, and Song, Fengfei. Mon .
"Future Changes of Subseasonal Precipitation Variability in North America During Winter Under Global Warming". United States. https://doi.org/10.1029/2018GL079900. https://www.osti.gov/servlets/purl/1497678.
@article{osti_1497678,
title = {Future Changes of Subseasonal Precipitation Variability in North America During Winter Under Global Warming},
author = {Dong, Lu and Leung, L. Ruby and Song, Fengfei},
abstractNote = {Abstract Changes in subseasonal precipitation variability have important implications for predictability of weather and climate extreme. Here we explore the mechanisms that lead to future changes in subseasonal precipitation variability in North America during winter based on 20 state‐of‐the‐art climate models. Modeling evidences indicate that in a warmer climate, the subseasonal precipitation variability consistently increases over most of North America, with intensified swing between the wet and dry extremes, but declines over Mexico. Using a moisture budget decomposition framework, two opposing mechanisms are established: the thermodynamic component from increasing moisture due to global warming intensifies the subseasonal precipitation variability, while the dynamic component from the projected reduction in subseasonal rainfall‐related circulation variability has an opposite effect. Overall, the thermodynamic effect wins the tug of war at the mid‐to‐high latitudes over most of North America, while the dynamic effect overwhelms the thermodynamic effect in Mexico, creating distinct changes in subseasonal precipitation variability.},
doi = {10.1029/2018GL079900},
journal = {Geophysical Research Letters},
number = 22,
volume = 45,
place = {United States},
year = {Mon Nov 05 00:00:00 EST 2018},
month = {Mon Nov 05 00:00:00 EST 2018}
}
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