Changes in Temperature and Precipitation Extremes in Superparameterized CAM in Response to Warmer SSTs
Abstract
Subdaily temperature and precipitation extremes in response to warmer SSTs are investigated on a global scale using the superparameterized (SP) Community Atmosphere Model (CAM), in which a cloud-resolving model is embedded in each CAM grid column to simulate convection explicitly. Two 10-yr simulations have been performed using present climatological sea surface temperature (SST) and perturbed SST climatology derived from the representative concentration pathway 8.5 (RCP8.5) scenario. Compared with the conventional CAM, SP-CAM simulates colder temperatures and more realistic intensity distribution of precipitation, especially for heavy precipitation. The temperature and precipitation extremes have been defined by the 99th percentile of the 3-hourly data. For temperature, the changes in the warm and cold extremes are generally consistent between CAM and SP-CAM, with larger changes in warm extremes at low latitudes and larger changes in cold extremes at mid-to-high latitudes. For precipitation, CAM predicts a uniform increase of frequency of precipitation extremes regardless of the rain rate, while SP-CAM predicts a monotonic increase of frequency with increasing rain rate and larger change of intensity for heavier precipitation. The changes in 3-hourly and daily temperature extremes are found to be similar; however, the 3-hourly precipitation extremes have a significantly larger change than daily extremes.more »
- Authors:
-
- School of Marine and Atmospheric Sciences, Stony Brook University, State University of New York, Stony Brook, New York
- Publication Date:
- Research Org.:
- State Univ. of New York (SUNY), Albany, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1409142
- Alternate Identifier(s):
- OSTI ID: 1541840
- Grant/Contract Number:
- DESC0012488; SC0012488
- 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
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences
Citation Formats
Zhou, Xin, and Khairoutdinov, Marat F. Changes in Temperature and Precipitation Extremes in Superparameterized CAM in Response to Warmer SSTs. United States: N. p., 2017.
Web. doi:10.1175/JCLI-D-17-0214.1.
Zhou, Xin, & Khairoutdinov, Marat F. Changes in Temperature and Precipitation Extremes in Superparameterized CAM in Response to Warmer SSTs. United States. https://doi.org/10.1175/JCLI-D-17-0214.1
Zhou, Xin, and Khairoutdinov, Marat F. Fri .
"Changes in Temperature and Precipitation Extremes in Superparameterized CAM in Response to Warmer SSTs". United States. https://doi.org/10.1175/JCLI-D-17-0214.1.
@article{osti_1409142,
title = {Changes in Temperature and Precipitation Extremes in Superparameterized CAM in Response to Warmer SSTs},
author = {Zhou, Xin and Khairoutdinov, Marat F.},
abstractNote = {Subdaily temperature and precipitation extremes in response to warmer SSTs are investigated on a global scale using the superparameterized (SP) Community Atmosphere Model (CAM), in which a cloud-resolving model is embedded in each CAM grid column to simulate convection explicitly. Two 10-yr simulations have been performed using present climatological sea surface temperature (SST) and perturbed SST climatology derived from the representative concentration pathway 8.5 (RCP8.5) scenario. Compared with the conventional CAM, SP-CAM simulates colder temperatures and more realistic intensity distribution of precipitation, especially for heavy precipitation. The temperature and precipitation extremes have been defined by the 99th percentile of the 3-hourly data. For temperature, the changes in the warm and cold extremes are generally consistent between CAM and SP-CAM, with larger changes in warm extremes at low latitudes and larger changes in cold extremes at mid-to-high latitudes. For precipitation, CAM predicts a uniform increase of frequency of precipitation extremes regardless of the rain rate, while SP-CAM predicts a monotonic increase of frequency with increasing rain rate and larger change of intensity for heavier precipitation. The changes in 3-hourly and daily temperature extremes are found to be similar; however, the 3-hourly precipitation extremes have a significantly larger change than daily extremes. The Clausius–Clapeyron scaling is found to be a relatively good predictor of zonally averaged changes in precipitation extremes over midlatitudes but not as good over the tropics and subtropics. The changes in precipitable water and large-scale vertical velocity are equally important to explain the changes in precipitation extremes.},
doi = {10.1175/JCLI-D-17-0214.1},
journal = {Journal of Climate},
number = 24,
volume = 30,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}
https://doi.org/10.1175/JCLI-D-17-0214.1
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