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Title: Resolution and Dynamical Core Dependence of Atmospheric River Frequency in Global Model Simulations

Abstract

This study examines the sensitivity of atmospheric river (AR) frequency simulated by a global model with different grid resolutions and dynamical cores. Analysis is performed on aquaplanet simulations using version 4 of Community Atmosphere Model (CAM4) at 240, 120, 60 and 30 km model resolutions each with the Model for Prediction Across Scales (MPAS) and High-Order Methods Modeling Environment (HOMME) dynamical cores. The frequency of AR events decreases with model resolution and the HOMME dynamical core produces more AR events than MPAS. Comparing the frequencies determined using absolute and percentile thresholds of large-scale conditions used to define an AR, model sensitivity is found to be related to the overall sensitivity of sub-tropical westerlies, atmospheric precipitable water content and profile and to a lesser extent on extra-tropical Rossby wave activity to model resolution and dynamical core. Real world simulations using MPAS at 120 km and 30 km grid resolutions also exhibit a decrease of AR frequency with increasing resolution over southern East Pacific, but there difference is smaller over northern East Pacific. This inter-hemispheric difference is related to the enhancement of convection in over the tropics with increased resolution. This anomalous convection sets off Rossby wave patterns that weaken the subtropicalmore » westerlies over southern East Pacific but have relatively little effect on those over northern East Pacific. In comparison to NCEP2 reanalysis, MPAS real world simulations are found to underestimate AR frequencies at both resolutions likely because of their climatologically drier sub-tropics and poleward shifted jets. This study highlights the important links between model climatology of large-scale conditions and extremes.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1182882
Report Number(s):
PNNL-SA-104683
KP1703010
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Climate, 28(7):2764-2776
Additional Journal Information:
Journal Name: Journal of Climate, 28(7):2764-2776
Country of Publication:
United States
Language:
English
Subject:
resolution; dynamical; core dependence; atmopheric river frequency

Citation Formats

Hagos, Samson M., Leung, Lai-Yung R., Yang, Qing, Zhao, Chun, and Lu, Jian. Resolution and Dynamical Core Dependence of Atmospheric River Frequency in Global Model Simulations. United States: N. p., 2015. Web. doi:10.1175/JCLI-D-14-00567.1.
Hagos, Samson M., Leung, Lai-Yung R., Yang, Qing, Zhao, Chun, & Lu, Jian. Resolution and Dynamical Core Dependence of Atmospheric River Frequency in Global Model Simulations. United States. https://doi.org/10.1175/JCLI-D-14-00567.1
Hagos, Samson M., Leung, Lai-Yung R., Yang, Qing, Zhao, Chun, and Lu, Jian. Wed . "Resolution and Dynamical Core Dependence of Atmospheric River Frequency in Global Model Simulations". United States. https://doi.org/10.1175/JCLI-D-14-00567.1. https://www.osti.gov/servlets/purl/1182882.
@article{osti_1182882,
title = {Resolution and Dynamical Core Dependence of Atmospheric River Frequency in Global Model Simulations},
author = {Hagos, Samson M. and Leung, Lai-Yung R. and Yang, Qing and Zhao, Chun and Lu, Jian},
abstractNote = {This study examines the sensitivity of atmospheric river (AR) frequency simulated by a global model with different grid resolutions and dynamical cores. Analysis is performed on aquaplanet simulations using version 4 of Community Atmosphere Model (CAM4) at 240, 120, 60 and 30 km model resolutions each with the Model for Prediction Across Scales (MPAS) and High-Order Methods Modeling Environment (HOMME) dynamical cores. The frequency of AR events decreases with model resolution and the HOMME dynamical core produces more AR events than MPAS. Comparing the frequencies determined using absolute and percentile thresholds of large-scale conditions used to define an AR, model sensitivity is found to be related to the overall sensitivity of sub-tropical westerlies, atmospheric precipitable water content and profile and to a lesser extent on extra-tropical Rossby wave activity to model resolution and dynamical core. Real world simulations using MPAS at 120 km and 30 km grid resolutions also exhibit a decrease of AR frequency with increasing resolution over southern East Pacific, but there difference is smaller over northern East Pacific. This inter-hemispheric difference is related to the enhancement of convection in over the tropics with increased resolution. This anomalous convection sets off Rossby wave patterns that weaken the subtropical westerlies over southern East Pacific but have relatively little effect on those over northern East Pacific. In comparison to NCEP2 reanalysis, MPAS real world simulations are found to underestimate AR frequencies at both resolutions likely because of their climatologically drier sub-tropics and poleward shifted jets. This study highlights the important links between model climatology of large-scale conditions and extremes.},
doi = {10.1175/JCLI-D-14-00567.1},
journal = {Journal of Climate, 28(7):2764-2776},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {4}
}

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