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Process-oriented Diagnosis Of Tropical Cyclones In High-resolution Gcms

Title: Process-oriented Diagnosis Of Tropical Cyclones In High-resolution Gcms.
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Name(s): Kim, Daehyun, author
Moon, Yumin, author
Camargo, Suzana J., author
Wing, Allison A., author
Sobel, Adam H., author
Murakami, Hiroyuki, author
Vecchi, Gabriel A., author
Zhao, Ming, author
Page, Eric, author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-03
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: This study proposes a set of process-oriented diagnostics with the aim of understanding how model physics and numerics control the representation of tropical cyclones (TCs), especially their intensity distribution, in GCMs. Three simulations are made using two 50-km GCMs developed at NOAA's Geophysical Fluid Dynamics Laboratory. The two models are forced with the observed sea surface temperature [Atmospheric Model version 2.5 (AM2.5) and High Resolution Atmospheric Model (HiRAM)], and in the third simulation, the AM2.5 model is coupled to an ocean GCM [Forecast-Oriented Low Ocean Resolution (FLOR)]. The frequency distributions of maximum near-surface wind near TC centers show that HiRAM tends to develop stronger TCs than the other models do. Large-scale environmental parameters, such as potential intensity, do not explain the differences between HiRAM and the other models. It is found that HiRAM produces a greater amount of precipitation near the TC center, suggesting that associated greater diabatic heating enables TCs to become stronger in HiRAM. HiRAM also shows a greater contrast in relative humidity and surface latent heat flux between the inner and outer regions of TCs. Various fields are composited on precipitation percentiles to reveal the essential character of the interaction among convection, moisture, and surface heat flux. Results show that the moisture sensitivity of convection is higher in HiRAM than in the other model simulations. HiRAM also exhibits a stronger feedback from surface latent heat flux to convection via near-surface wind speed in heavy rain-rate regimes. The results emphasize that the moisture-convection coupling and the surface heat flux feedback are critical processes that affect the intensity of TCs in GCMs.
Identifier: FSU_libsubv1_wos_000427438100001 (IID), 10.1175/JCLI-D-17-0269.1 (DOI)
Keywords: wind, part i, hurricanes, cmip5 models, atlantic basin, coupled climate model, cumulus convection, general-circulation models, potential intensity, western north pacific
Publication Note: The publisher's version of record is available at https://doi.org/10.1175/JCLI-D-17-0269.1
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000427438100001
Owner Institution: FSU
Is Part Of: Journal of Climate.
0894-8755
Issue: iss. 5, vol. 31

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Kim, D., Moon, Y., Camargo, S. J., Wing, A. A., Sobel, A. H., Murakami, H., … Page, E. (2018). Process-oriented Diagnosis Of Tropical Cyclones In High-resolution Gcms. Journal Of Climate. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000427438100001