Explanipedia

Convectively-Coupled Global Rossby Modes in an Idealized Moist GCM Open

Cameron G. MacDonald, Pablo Zurita‐Gotor, Isaac M. Held, Yi Ming · 2024

The westward-propagating convectively-coupled equatorial wave (CCEW) variability produced by an idealized general circulation model (GCM) is investigated.The model is a zonally-symmetric aquaplanet with a slab ocean.Water vapor in the mode…

Forecasting Tropical Annual Maximum Wet‐Bulb Temperatures Months in Advance From the Current State of ENSO Open

Yi Zhang, William R. Boos, Isaac M. Held, Christopher J. Paciorek, S. Fueglistaler · 2024

Humid heatwaves, characterized by high temperature and humidity combinations, challenge tropical societies. Extreme wet‐bulb temperatures (TW) over tropical land are coupled to the warmest sea surface temperatures by atmospheric convection…

Forecasting Tropical Annual Maximum Wet-Bulb Temperatures Months in Advance from the Current State of El Niño Open

Yi Zhang, William R. Boos, Isaac M. Held, Christopher J. Paciorek, S. Fueglistaler · 2023

Humid heatwaves, characterized by high temperature and humidity combinations, challenge tropical societies. Extreme wet-bulb temperatures (TW) over tropical land are coupled to the warmest sea surface temperatures (SST) by atmospheric conv…

Non‐Uniqueness in ITCZ Latitude Due To Radiation‐Circulation Coupling in an Idealized GCM Open

Pablo Zurita‐Gotor, Isaac M. Held, Timothy M. Merlis, Chiung‐Yin Chang, Spencer A. Hill , et al. · 2023

An idealized aquaplanet moist global atmospheric model with realistic radiative transfer but no clouds and no convective parameterization is found to possess multiple climate equilibria. When forced symmetrically about the equator, in some…

Non-uniqueness in ITCZ latitude due to radiation-circulation coupling in an idealized GCM Open

Pablo Zurita‐Gotor, Isaac M. Held, Timothy M. Merlis, Chiung‐Yin Chang, Spencer A. Hill , et al. · 2023

An idealized aquaplanet moist global atmospheric model with realistic radiative transfer but no clouds and no convective parameterization is found to possess multiple climate equilibria: when forced symmetrically about the equator, in some…

Data files for the manuscript "Non-uniqueness in ITCZ latitude due to radiation-circulation coupling in an idealized GCM" Open

Pablo Zurita‐Gotor, Isaac M. Held, Timothy M. Merlis, Chiung‐Yin Chang, Spencer A. Hill , et al. · 2023

MATLAB scripts and data used to create the figures in the paper "Non-uniqueness in ITCZ latitude due to radiation-circulation coupling in an idealized GCM" by Zurita-Gotor et al., submitted to JAMES.

Data files for the manuscript "Non-uniqueness in ITCZ latitude due to radiation-circulation coupling in an idealized GCM" Open

Pablo Zurita‐Gotor, Isaac M. Held, Timothy M. Merlis, Chiung‐Yin Chang, Spencer A. Hill , et al. · 2023

MATLAB scripts and data used to create the figures in the paper "Non-uniqueness in ITCZ latitude due to radiation-circulation coupling in an idealized GCM" by Zurita-Gotor et al., submitted to JAMES.

Manabe’s Radiative–Convective Equilibrium Open

Nadir Jeevanjee, Isaac M. Held, V. Ramaswamy · 2022

Syukoro (Suki) Manabe’s Nobel Prize in Physics was awarded largely for his early work on one-dimensional models of “radiative–convective equilibrium” (RCE), which produced the first credible estimates of Earth’s climate sensitivity. This a…

A Scaling Theory for the Diffusivity of Poleward Eddy Heat Transport Based on Rhines Scaling and the Global Entropy Budget Open

Chiung‐Yin Chang, Isaac M. Held · 2022

Diffusive theories for the meridional atmospheric energy transport can summarize our understanding of this central aspect of the general circulation. They can also be utilized in simple models of Earth’s energy balance to help interpret th…

Nonlinear generation of long waves and the reversal of eddy momentum fluxes in a two-layer quasi-geostrophic model Open

Tsung‐Lin Hsieh, Chiung-Yin Chang, Isaac M. Held, Pablo Zurita‐Gotor · 2021

Although classical theories of midlatitude momentum fluxes focus on the wave-mean flow interaction, wave-wave interactions may be important for generating long waves. It is shown in this study that this nonlinear generation has implication…

Projections of tropical heat stress constrained by atmospheric dynamics Open

Yi Zhang, Isaac M. Held, S. Fueglistaler · 2021

<p>Extreme heat under global warming is a concerning issue for the growing tropical population. However, model projections of extreme temperatures, a widely used metric for extreme heat, are uncertain on regional scales. In addition,…

Projections of tropical heat stress constrained by atmospheric dynamics Open

Yi Zhang, Isaac M. Held, S. Fueglistaler · 2021

NOAA-GFDL GFDL-ESM4 CMIP6 CMIP additional model output Open

John P. Krasting, Jasmin G. John, Chris Blanton, Colleen McHugh, S. V. Nikonov , et al. · 2021

This repository contains annual 3D sea water age since surface contact files from a subset of simulations with GFDL's ESM4.1 climate model (Dunne et al., 2020) that were contributed to the 6th Coupled Model Intercomparison Project (CMIP6).…

NOAA-GFDL GFDL-ESM4 CMIP6 CMIP additional model output Open

John P. Krasting, Jasmin G. John, Chris Blanton, Colleen McHugh, S. V. Nikonov , et al. · 2021

This repository contains annual 3D sea water age since surface contact files from a subset of simulations with GFDL's ESM4.1 climate model (Dunne et al., 2020) that were contributed to the 6th Coupled Model Intercomparison Project (CMIP6).…

NOAA-GFDL GFDL-ESM4 CMIP6 CMIP additional model output Open

John P. Krasting, Jasmin G. John, Chris Blanton, Colleen McHugh, S. V. Nikonov , et al. · 2021

This repository contains annual 3D sea water age since surface contact files from a subset of simulations with GFDL's ESM4.1 climate model (Dunne et al., 2020) that were contributed to the 6th Coupled Model Intercomparison Project (CMIP6).…

The Parameter Dependence of Eddy Heat Flux in a Homogeneous Quasigeostrophic Two-Layer Model on a β Plane with Quadratic Friction Open

Chiung-Yin Chang, Isaac M. Held · 2020

This study investigates the parameter dependence of eddy heat flux in a homogeneous quasigeostrophic two-layer model on a β plane with imposed environmental vertical wind shear and quadratic frictional drag. We examine the extent to which …

Large-scale control on the frequency of tropical cyclones and seeds: a consistent relationship across a hierarchy of global atmospheric models Open

Tsung‐Lin Hsieh, Gabriel A. Vecchi, Wenchang Yang, Isaac M. Held, Stephen T. Garner · 2020

A diagnostic framework is developed to explain the response of tropical cyclones (TCs) to climate in high-resolution global atmospheric models having different complexity of boundary conditions. The framework uses vortex dynamics to identi…

The GFDL Earth System Model Version 4.1 (GFDL‐ESM 4.1): Overall Coupled Model Description and Simulation Characteristics Open

John P. Dunne, Larry W. Horowitz, Alistair Adcroft, Paul Ginoux, Isaac M. Held , et al. · 2020

We describe the baseline coupled model configuration and simulation characteristics of GFDL's Earth System Model Version 4.1 (ESM4.1), which builds on component and coupled model developments at GFDL over 2013–2018 for coupled carbon‐chemi…

Using the fast impact of anthropogenic aerosols on regional land temperature to constrain aerosol forcing Open

Zhaoyi Shen, Yi Ming, Isaac M. Held · 2020

Atmospheric simulations of regional land temperature suggest a powerful approach for constraining historical aerosol forcing.

NOAA-GFDL/ESM4: GFDL Earth System Model 4 Open

John P. Dunne, Larry W. Horowitz, Alistair Adcroft, Paul Ginoux, Isaac M. Held , et al. · 2020

This is the public release of ESM4 used for simulations done for publication

Climate Sensitivity of GFDL's CM4.0 Open

Michael Winton, Alistair Adcroft, John P. Dunne, Isaac M. Held, Elena Shevliakova , et al. · 2020

GFDL's new CM4.0 climate model has high transient and equilibrium climate sensitivities near the middle of the upper half of CMIP5 models. The CMIP5 models have been criticized for excessive sensitivity based on observations of present‐day…

Structure and Performance of GFDL's CM4.0 Climate Model Open

Isaac M. Held, Huan Guo, Alistair Adcroft, John P. Dunne, Larry W. Horowitz , et al. · 2019

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 a…

The GFDL Global Ocean and Sea Ice Model OM4.0: Model Description and Simulation Features Open

Alistair Adcroft, W. Anderson, V. Balaji, Chris Blanton, Mitchell Bushuk , et al. · 2019

We document the configuration and emergent simulation features from the Geophysical Fluid Dynamics Laboratory (GFDL) OM4.0 ocean/sea ice model. OM4 serves as the ocean/sea ice component for the GFDL climate and Earth system models. It is a…

NOAA-GFDL/CM4: CM4.0 Paper Release Open

Isaac M. Held, Hongwei Guo, Alistair Adcroft, John P. Dunne, Larry W. Horowitz , et al. · 2019

GFDL CM4.0 climate model source code

Aquaplanet Simulations of Tropical Cyclones Open

Timothy M. Merlis, Isaac M. Held · 2019

Effects of the Mean Flow on Martian Transient Eddy Activity: Studies with an Idealized General Circulation Model Open

Todd A. Mooring, Isaac M. Held, R. J. Wilson · 2019

The extent to which the eddy statistics of the Martian atmosphere can be inferred from the mean state and highly simplified assumptions about diabatic and frictional processes is investigated using an idealized general circulation model (G…

The Control of Surface Friction on the Scales of Baroclinic Eddies in a Homogeneous Quasigeostrophic Two-Layer Model Open

Chiung‐Yin Chang, Isaac M. Held · 2019

In idealized models of the extratropical troposphere, both β and surface friction can control the equilibrated scales of baroclinic eddies by stopping the inverse cascade. A scaling theory on how surface friction alone sets these scales wa…

The Early Development of the 2015/16 Quasi-Biennial Oscillation Disruption Open

Pu Lin, Isaac M. Held, Yi Ming · 2019

An unprecedented disruption of the quasi-biennial oscillation (QBO) started to develop from late 2015. The early development of this event is analyzed using the space–time spectra of eddies from reanalysis data. While the extratropical wav…

100 Years of Progress in Understanding the General Circulation of the Atmosphere Open

Isaac M. Held · 2018

Some of the advances of the past century in our understanding of the general circulation of the atmosphere are described, starting with a brief summary of some of the key developments from the first half of the twentieth century, but with …

Sensitivity of Radiative‐Convection Equilibrium to Divergence Damping in GFDL‐FV3‐Based Cloud‐Resolving Model Simulations Open

Usama Anber, Nadir Jeevanjee, Lucas Harris, Isaac M. Held · 2018

Using a nonhydrostatic model based on a version of Geophysical Fluid Dynamics Laboratory's FV3 dynamical core at a cloud‐resolving resolution in radiative‐convective equilibrium (RCE) configuration, the sensitivity of the mean RCE climate …

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