Understanding Monsoonal Water Cycle Changes in a Warmer Climate in E3SMv1 Using a Normalized Gross Moist Stability Framework

One of the grand challenges of climate science is understanding the changes of the tropical rain belts and monsoon systems owing to CO2‐induced warming. A promising path forward links the fluxes of energy and moisture to tropical circulation features. To this end, we make use of the Energy Exascale Earth System Model version 1, where the divergence of moist static energy and moisture have been calculated online, and employ a normalized gross moist stability (NGMS) diagnostic framework to understand the linkages between changes in the flow of energy and moisture within the monsoons. We focus on the Asian Summer Monsoon system and utilize a series of atmosphere‐land and atmosphere‐land‐ocean simulations to understand the connection between fluxes and monsoons. Uncoupled simulations with prescribed sea surface temperatures indicate that decreases in NGMS over land are important in explaining precipitation increases in response to both sea surface temperature and CO2 increases. In fully coupled experiments, NGMS decreases remain an important contributor to the increase in P‐E, but the coupled simulations highlight the importance of consistent ocean and land responses in interpreting the monsoon changes. This study indicates that transient eddy fluxes play an important role in NGMS decreases and that a time‐mean view of the monsoon circulations is insufficient to quantify the link between future changes in the fluxes of energy and moisture. Compensation between dynamic and thermodynamic components of vertical moist static energy advection occurs, with the thermodynamic contribution dominating. The compensation is shown to be sensitive to relative humidity, with higher relative humidity leading to a stronger thermodynamic component.

[1]  C. S. Zender,et al.  An Overview of the Atmospheric Component of the Energy Exascale Earth System Model , 2019, Journal of Advances in Modeling Earth Systems.

[2]  Philip W. Jones,et al.  The DOE E3SM Coupled Model Version 1: Overview and Evaluation at Standard Resolution , 2019, Journal of Advances in Modeling Earth Systems.

[3]  N. McFarlane,et al.  Sensitivity of Climate Simulations to the Parameterization of Cumulus Convection in the Canadian Climate Centre General Circulation Model , 1995, Data, Models and Analysis.

[4]  A. Gnanadesikan,et al.  Simulated Dust Aerosol Impacts on Western Sahelian Rainfall: Importance of Ocean Coupling , 2018, Journal of Climate.

[5]  A. Rapp,et al.  Response of the Intertropical Convergence Zone to Climate Change: Location, Width, and Strength , 2018, Current Climate Change Reports.

[6]  Sarah M. Kang,et al.  Contrasting Impacts of Radiative Forcing in the Southern Ocean versus Southern Tropics on ITCZ Position and Energy Transport in One GFDL Climate Model , 2018, Journal of Climate.

[7]  Sarah M. Kang,et al.  Global energetics and local physics as drivers of past, present and future monsoons , 2018, Nature Geoscience.

[8]  C. Hannay,et al.  The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific , 2018 .

[9]  D. Bader.  Energy Exascale Earth System Model (E3SM) Project Strategy , 2017 .

[10]  M. Ting,et al.  Understanding the Asian summer monsoon response to greenhouse warming: the relative roles of direct radiative forcing and sea surface temperature change , 2017, Climate Dynamics.

[11]  L. Leung,et al.  Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs , 2017, Climate Dynamics.

[12]  T. Schneider,et al.  Narrowing of the ITCZ in a warming climate: Physical mechanisms , 2016 .

[13]  T. Schneider,et al.  Energetic Constraints on the Width of the Intertropical Convergence Zone , 2016 .

[14]  Z. Kuang,et al.  Exploring the Role of Eddy Momentum Fluxes in Determining the Characteristics of the Equinoctial Hadley Circulation: Fixed-SST Simulations , 2016 .

[15]  Veronika Eyring,et al.  Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization , 2015 .

[16]  L. Back,et al.  Gross Moist Stability Assessment during TOGA COARE: Various Interpretations of Gross Moist Stability , 2015 .

[17]  P. O’Gorman,et al.  The Response of Precipitation Minus Evapotranspiration to Climate Warming: Why the “Wet-Get-Wetter, Dry-Get-Drier” Scaling Does Not Hold over Land , 2015 .

[18]  S. Ghan,et al.  Description and evaluation of a new four-mode version of the Modal Aerosol Module (MAM4) within version 5.3 of the Community Atmosphere Model , 2015 .

[19]  C. Deser,et al.  Towards predictive understanding of regional climate change , 2015 .

[20]  T. Shaw,et al.  Tug of war on summertime circulation between radiative forcing and sea surface warming , 2015 .

[21]  Naomi Henderson,et al.  Mechanisms of Asian Summer Monsoon Changes in Response to Anthropogenic Forcing in CMIP5 Models , 2015 .

[22]  Andrew Gettelman,et al.  Advanced two-moment bulk microphysics for global models. Part I: off-line tests and comparison with other schemes. , 2015 .

[23]  K. Inoue,et al.  Column-Integrated Moist Static Energy Budget Analysis on Various Time Scales during TOGA COARE , 2014 .

[24]  E. Maloney,et al.  Gross Moist Stability and MJO Simulation Skill in Three Full-Physics GCMs , 2014 .

[25]  A. Kitoh,et al.  Thermodynamic and dynamic effects on regional monsoon rainfall changes in a warmer climate , 2014 .

[26]  D. Hartmann,et al.  The Atmospheric Energy Constraint on Global-Mean Precipitation Change , 2014 .

[27]  W. Boos,et al.  Interannual Variability of Monsoon Precipitation and Local Subcloud Equivalent Potential Temperature , 2013 .

[28]  Sarah M. Kang,et al.  Contribution of ocean overturning circulation to tropical rainfall peak in the Northern Hemisphere , 2013 .

[29]  C. Chou,et al.  Changes in gross moist stability in the tropics under global warming , 2013, Climate Dynamics.

[30]  Eric D. Maloney,et al.  Moisture Modes and the Eastward Propagation of the MJO , 2013 .

[31]  Bin Wang,et al.  Future change of Asian-Australian monsoon under RCP 4.5 anthropogenic warming scenario , 2013, Climate Dynamics.

[32]  Zong-Liang Yang,et al.  Technical description of version 4.5 of the Community Land Model (CLM) , 2013 .

[33]  Bin Wang,et al.  The Asian summer monsoon: an intercomparison of CMIP5 vs. CMIP3 simulations of the late 20th century , 2013, Climate Dynamics.

[34]  Eric D. Maloney,et al.  An Idealized Semi-Empirical Framework for Modeling the Madden–Julian Oscillation , 2012 .

[35]  Karl E. Taylor,et al.  An overview of CMIP5 and the experiment design , 2012 .

[36]  Mark A. Taylor,et al.  CAM-SE: A scalable spectral element dynamical core for the Community Atmosphere Model , 2012, Int. J. High Perform. Comput. Appl..

[37]  A. Sobel,et al.  Impact of imposed drying on deep convection in a cloud‐resolving model , 2012 .

[38]  A. Kitoh,et al.  Will the South Asian monsoon overturning circulation stabilize any further? , 2012, Climate Dynamics.

[39]  R. Allan,et al.  Energetic Constraints on Precipitation Under Climate Change , 2012, Surveys in Geophysics.

[40]  A. Sobel,et al.  Response of convection to relative sea surface temperature: Cloud‐resolving simulations in two and three dimensions , 2011 .

[41]  William C. Skamarock,et al.  A unified approach to energy conservation and potential vorticity dynamics for arbitrarily-structured C-grids , 2010, J. Comput. Phys..

[42]  C. Bretherton,et al.  A Simple Model of Climatological Rainfall and Vertical Motion Patterns over the Tropical Oceans , 2009 .

[43]  Sarah M. Kang,et al.  The Tropical Response to Extratropical Thermal Forcing in an Idealized GCM: The Importance of Radiative Feedbacks and Convective Parameterization , 2009 .

[44]  J. Neelin,et al.  Evaluating the “Rich-Get-Richer” Mechanism in Tropical Precipitation Change under Global Warming , 2009 .

[45]  D. Randall,et al.  Large‐Eddy Simulation of Maritime Deep Tropical Convection , 2009 .

[46]  A. Sobel,et al.  The Mechanics of Gross Moist Stability , 2009 .

[47]  Ken Takahashi.  Radiative Constraints on the Hydrological Cycle in an Idealized Radiative–Convective Equilibrium Model , 2009 .

[48]  R. Neale,et al.  The Impact of Convection on ENSO: From a Delayed Oscillator to a Series of Events , 2008 .

[49]  Matthew E. Peters,et al.  Analysis of Atmospheric Energy Transport in ERA-40 and Implications for Simple Models of the Mean Tropical Circulation , 2008 .

[50]  Charles S. Zender,et al.  Analysis of self-describing gridded geoscience data with netCDF Operators (NCO) , 2008, Environ. Model. Softw..

[51]  Andrew Gettelman,et al.  A new two-moment bulk stratiform cloud microphysics scheme in the Community Atmosphere Model, version 3 (CAM3). Part I: Description and numerical tests , 2008 .

[52]  S. Ghan,et al.  A New Two-Moment Bulk Stratiform Cloud Microphysics Scheme in the Community Atmosphere Model, Version 3 (CAM3). Part II: Single-Column and Global Results , 2008 .

[53]  W. Collins,et al.  Radiative forcing by long‐lived greenhouse gases: Calculations with the AER radiative transfer models , 2008 .

[54]  Bin Wang,et al.  Global monsoon: Dominant mode of annual variation in the tropics , 2008 .

[55]  D. Raymond,et al.  A theory for the spinup of tropical depressions , 2007 .

[56]  R. A. Plumb,et al.  Monsoon Dynamics with Interactive Forcing. Part II: Impact of Eddies and Asymmetric Geometries , 2007 .

[57]  R. A. Plumb,et al.  Monsoon Dynamics with Interactive Forcing. Part I: Axisymmetric Studies , 2007 .

[58]  G. Vecchi,et al.  Global Warming and the Weakening of the Tropical Circulation , 2007 .

[59]  B. Soden,et al.  Robust Responses of the Hydrological Cycle to Global Warming , 2006 .

[60]  C. Bretherton,et al.  Geographic variability in the export of moist static energy and vertical motion profiles in the tropical Pacific , 2006 .

[61]  Matthew E. Peters,et al.  Interpretation of simple and cloud-resolving simulations of moist convection–radiation interaction with a mock-Walker circulation , 2006 .

[62]  A..  A new convective adjustment scheme. Part I: Observational and theoretical basis , 2006 .

[63]  V. Larson,et al.  Using Probability Density Functions to Derive Consistent Closure Relationships among Higher-Order Moments , 2005 .

[64]  J. Neelin,et al.  Mechanisms of global warming impacts on regional Tropical precipitation , 2004 .

[65]  A. Arakawa.  The Cumulus Parameterization Problem: Past, Present, and Future , 2004 .

[66]  A. Nikoghossian.  Radiative Transfer in Inhomogeneous Atmospheres. I , 2004 .

[67]  J. Janowiak,et al.  The Version 2 Global Precipitation Climatology Project (GPCP) Monthly Precipitation Analysis (1979-Present) , 2003 .

[68]  Sulochana Gadgil,et al.  The Indian monsoon and its variability , 2003 .

[69]  W. Cotton,et al.  Small-Scale and Mesoscale Variability in Cloudy Boundary Layers: Joint Probability Density Functions , 2002 .

[70]  Vincent E. Larson,et al.  A PDF-Based Model for Boundary Layer Clouds. Part I: Method and Model Description , 2002 .

[71]  Vincent E. Larson,et al.  A PDF-Based Model for Boundary Layer Clouds. Part II: Model Results , 2002 .

[72]  Johan Nilsson,et al.  The Weak Temperature Gradient Approximation and Balanced Tropical Moisture Waves , 2001 .

[73]  Christopher S. Bretherton,et al.  Modeling Tropical Precipitation in a Single Column , 2000 .

[74]  J. Neelin,et al.  Estimating the Gross Moist Stability of the Tropical Atmosphere , 1998 .

[75]  P. Xie,et al.  Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs , 1997 .

[76]  E. Mlawer,et al.  Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave , 1997 .

[77]  Phillip A. Arkin,et al.  Analyses of Global Monthly Precipitation Using Gauge Observations, Satellite Estimates, and Numerical Model Predictions , 1996 .

[78]  Guang J. Zhang.  Effects of cumulus convection on the simulated monsoon circulation in a general circulation model , 1994 .

[79]  Modes of Tropical Variability under Convective Adjustment and the Madden–Julian Oscillation. Part I: Analytical Theory , 1994 .

[80]  J. Neelin,et al.  Modes of Tropical Variability under Convective Adjustment and the Madden–Julian Oscillation. Part II: Numerical Results , 1994 .

[81]  A. Slingo,et al.  The response of a general circulation model to cloud longwave radiative forcing. I: Introduction and initial experiments , 1988 .

[82]  I. Held,et al.  Modeling Tropical Convergence Based on the Moist Static Energy Budget , 1987 .

[83]  A. Betts.  A new convective adjustment scheme. Part I: Observational and theoretical basis , 1986 .

[84]  T. N. Krishnamurti,et al.  Oscillations of a Monsoon System. Part I. Observational Aspects , 1976 .