ORCID Profile
0000-0002-6744-439X
Current Organisation
Princeton University
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Publisher: American Meteorological Society
Date: 27-05-2015
Abstract: The sensitivity of global tropical cyclone (TC) activity to changes in a zonally symmetric sea surface temperature (SST) distribution and the associated large-scale atmospheric circulation are investigated. High-resolution (~50-km horizontal grid spacing) atmospheric general circulation model simulations with maximum SST away from the equator are presented. Simulations with both fixed-SST and slab ocean lower boundary conditions are compared. The simulated TCs that form on the poleward flank of the intertropical convergence zone (ITCZ) are tracked and changes in the frequency and intensity of those storms are analyzed between the different experiments. The total accumulated cyclone energy (ACE) increases as the location of the maximum SST shifts farther away from the equator. The location of the ITCZ also shifts in conjunction with changes to the SST profile, and this plays an important role in mediating the frequency and intensity of the TCs that form within this modeling framework.
Publisher: American Geophysical Union (AGU)
Date: 11-2020
DOI: 10.1029/2019MS002015
Publisher: American Geophysical Union (AGU)
Date: 11-2019
DOI: 10.1029/2019MS001829
Abstract: We describe the Geophysical Fluid Dynamics Laboratory's CM4.0 physical climate model, with emphasis on those aspects that may be of particular importance to users of this model and its simulations. The model is built with the AM4.0/LM4.0 atmosphere/land model and OM4.0 ocean model. Topics include the rationale for key choices made in the model formulation, the stability as well as drift of the preindustrial control simulation, and comparison of key aspects of the historical simulations with observations from recent decades. Notable achievements include the relatively small biases in seasonal spatial patterns of top‐of‐atmosphere fluxes, surface temperature, and precipitation reduced double Intertropical Convergence Zone bias dramatically improved representation of ocean boundary currents a high‐quality simulation of climatological Arctic sea ice extent and its recent decline and excellent simulation of the El Niño‐Southern Oscillation spectrum and structure. Areas of concern include inadequate deep convection in the Nordic Seas an inaccurate Antarctic sea ice simulation precipitation and wind composites still affected by the equatorial cold tongue bias muted variability in the Atlantic Meridional Overturning Circulation strong 100 year quasiperiodicity in Southern Ocean ventilation and a lack of historical warming before 1990 and too rapid warming thereafter due to high climate sensitivity and strong aerosol forcing, in contrast to the observational record. Overall, CM4.0 scores very well in its fidelity against observations compared to the Coupled Model Intercomparison Project Phase 5 generation in terms of both mean state and modes of variability and should prove a valuable new addition for analysis across a broad array of applications.
Publisher: Meteorological Society of Japan
Date: 2013
Publisher: Meteorological Society of Japan
Date: 2013
No related grants have been discovered for Isaac Held.