Unified Days-to-Decades Predictability of Weather and Climate
Principal Investigator: J. Kinter
Co-Investigators: B. Cash, T. DelSole, P. Dirmeyer, B. Huang, B. Klinger, V. Krishnamurthy, J. Lu, E. Schneider, J. Shukla, C. Stan, D. Straus
TABLE OF CONTENTS (30 pp limit, approved by NSF on 19 October 2012) – 1 pg
1. INTRODUCTION – 4 pp
2. RESULTS FROM PRIOR RESEARCH – 10 pp
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COLA’s Contributions to Predictability Theory
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Model Fidelity and Predictability
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Evaluation of Weather Noise and its Role in Climate Model Simulations and Forecasts
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Intra-seasonal, Seasonal and Interannual (ISI) Predictability and Prediction
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Ensemble ENSO Hindcasts Initialized from Multiple Ocean Analyses
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A Statistical–Dynamical Estimate of Winter ENSO Teleconnections in a Future Climate
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Intra-seasonal and Seasonally Persisting Patterns of Indian Monsoon Rainfall
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Systematic Evaluation of Intra-seasonal to Interannual Predictability
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Land-Climate Interactions
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GLACE-2 Prediction Skill from Land Initialization
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Rebound of Predictability over US Great Plains
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Severe Drought Likelihood in a Changing Climate
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Decadal Predictability and Prediction
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Scientific Basis for Decadal Prediction
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Demonstration of Decadal Predictability and Prediction Skill
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COLA’s Contribution to CMIP5 Decadal Predictions
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High Spatial Resolution
3. PROPOSED WORK – 15 pp
3.1 Predictability from Days to Decades in a Changing Climate
3.1.1 ISI Predictability and Prediction
3.1.1.1 Land-Atmosphere Interaction
3.1.1.1.1 Land-driven Predictability
3.1.1.1.2 Improved Land-driven Prediction
3.1.1.1.3 Coupling Between Land Surface and Boundary Layer
3.1.1.2 Ocean-Atmosphere Interaction
3.1.1.2.1 What is the origin of inter-event diversity of ENSO events?
3.1.1.2.2 Ensemble prediction: uncertainty of ocean initial state
3.1.1.2.3 Dynamical pathways for low-frequency mid-latitude variability
3.1.1.2.4 Oceanic Fronts, Western Boundary Currents and Storm Tracks
3.1.1.2.5 Tropical-Extratropical and Trop-Stratosphere Coupling
3.1.1.2.6 Persistent Atmospheric Eddies and Blocking
3.1.1.3 Internally- and Externally-Generated Changes in ISI Predictability
TIM WILL PREPARE A LONG PARAGRAPH (PROOF OF CONCEPT IN PRELIMINARY WORK)
3.1.1.3.1 Attribution of Climate Events
3.1.2 Decadal Predictability and Prediction: Natural and Forced Variability
3.1.2.1 Decadal predictability and prediction
3.1.2.2 Mechanisms for decadal variability and its predictability
3.1.2.2.1 Linear Inverse Modeling
3.1.2.2.2 AMOC Variability
3.2 Evaluate Fidelity of National Climate Models, with Actionable Feedback to National Model Development Centers
3.2.1 Multivariate Skill Assessment
3.2.2 Investigation of Alternative Physics Parameterizations
3.2.3 Understanding and Validation of Land-Atmosphere Processes
3.2.4 Multi-Model Interactive Ensemble
3.3 Toward the Next Generation Seamless System for Operational Climate Forecasting
3.3.1 Systematic Evaluation of the National Models
3.3.1.1 Mean climate and annual cycle
3.3.1.2 Understanding the sources of climate model bias
3.3.1.2.1 Enhancing coastal upwelling and eddy divergence
3.3.1.2.2 Reducing the low cloud error
3.3.1.2.3 Reducing equatorial bias
3.3.1.2.4 Terrestrial water cycle drift
3.3.1.2.5 Artificial Damping by Numerics
3.3.1.3 Intraseasonal Variability and Predictability
3.3.1.4 Seasonal Variability and Predictability: Tropical Heating and ENSO
3.3.1.5 Interannual variability- ENSO, IOD and Atlantic Ocean
3.3.1.5.1 Evaluation of ENSO Prediction
3.3.1.5.2 Exploring Indian Ocean predictability and its implication for the Asian Monsoon
3.3.1.5.3 Potential Predictability of Tropical Atlantic Variability
3.3.1.6 COLA Monsoon Forecast
3.3.1.7 New methodologies to compare models
3.3.1.8 Predictability of Regional Climate: Scientific Basis for Adaptation Strategies
3.3.2 Practical Methods of Initializing High-Resolution Coupled Models
3.3.3 Define R&D Pathway and Address Operational R2O and O2R Issues
3.4 Broader Impacts and Service to the Nation – 2 pp
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Develop/maintain web page for national climate models
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Create IGES @ GMU: climate, environment, biodiversity, society
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Educate next generation: GMU Climate Dynamics Ph.D. program
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Contribute to NMME for operational seasonal forecast
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Further develop/support GrADS; export best practices in data mgt.
NOTE: Items highlighted in yellow are missing and need to be filled in. Items highlighted in green (references, figures and sections and pointers to them) need to be cross-checked.
1. INTRODUCTION - 5 pp
Since 1993 (1984?), the Center for Ocean-Land-Atmosphere Studies (COLA1) has been a world-leading scientific research center devoted to an improved understanding of climate variability, predictability and change. It maintains a position of preeminence and national leadership that is crucial to the nation’s climate research enterprise and contributes toward providing better climate forecast services. Its scientists lead the nation in efforts to provide a better scientific description of the predictability and variability of climate, which is essential for the design of better prediction and attribution systems.
The COLA mode of organization has fostered collaboration among a group of excellent climate scientists that has led to several achievements. First, and most importantly, COLA has made several important scientific contributions that have led to significant progress in our understanding of the physical climate system. Second, COLA is uniquely capable of diagnosing and experimenting with multiple U.S. national climate models. Third, COLA scientists have developed several innovative techniques for obtaining a deeper understanding of the roles of different climate system components and, importantly, how the coupling among them influences predictability. Fourth, COLA has developed methods to frame predictability and prediction issues in probabilistic terms. Fifth, COLA has contributed a widely-used suite of tools for geophysical data analysis and display that has become an essential element of the rapid progress our field has made in the past two (three?) decades. Each of these points is described below.
With this proposal, COLA will continue and expand the line of research that has established a scientific basis for predictability in a changing climate and fostered the transition of climate predictability research results to operational use by the world’s weather and climate services. The proposed work will build on prior results to establish a unified probabilistic framework for predictability of variations over days to decades in a changing climate. It will include rigorous multi-scale evaluation of physical processes and mechanisms of climate variability at days-to-decades time scales in national models. The work will be carried out in a multi-model context using state-of-the-art national models, and it will enable COLA to contribute directly to the development of the next generation (2018) seamless prediction system for U.S. operational climate forecasting.
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COLA has made important scientific contributions
The main contribution of COLA research over the past two decades has been to establish a scientific basis for quantitative dynamical seasonal prediction (DSP) that is grounded in both classical predictability theory and makes use of state-of-the-art numerical models of the physical climate system. The many aspects of these scientific contributions are detailed in nearly 600 peer-reviewed publications that COLA has produced over the past 20 years (URL). Highlights of the most recent work are provided in Section 2, Results from Prior Support.
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COLA has a unique capability to run coupled models from multiple major institutions
COLA has developed the capability to diagnose and experiment with each of the national models supported by the National Science Foundation (NSF) and the Department of Energy (DoE; the Community Climate System Model or CCSM, now called the Community Earth System Model or CESM); the National Oceanic and Atmospheric Administration (NOAA; the Climate Forecast System or CFS, from the NOAA National Centers for Environmental Prediction or NCEP, and the Coupled Model from the NOAA Geophysical Fluid Dynamics Laboratory or GFDL); and the National Aeronautics and Space Administration (NASA; the GEOS model from the NASA Global Modeling and Assimilation Office or GMAO); as well as the global atmosphere and coupled models from the European Centre for Medium-range Weather Forecasts (ECMWF; System4 or the Ensemble Prediction System). By adopting a national models approach, COLA has set itself apart from the model development centers, thereby enabling it to formulate and execute experiments that test each model’s unique virtues and potential for improvement. The collaboration with the ECMWF, enabled by COLA’s special relationship with ECMWF, has led to several important breakthroughs in the seamless weather and climate prediction area. Running large experiments with multiple large models has required COLA to develop the capability to use the Nation’s shared high-performance computing resources and managing and manipulating the diverse output from different models. In the past several years, COLA has competed for, been awarded and made productive use of tens of millions of core-hours on the largest and fastest supercomputers available to civilian researchers (e.g. Kraken and Athena at the National Institute for Computational Studies or NICS; Ranger at the Texas Advanced Computing Center or TACC; Jaguar and Hopper at the DoE’s Oak Ridge National Laboratory and National Energy Research Supercomputing Center or NERSC; BlueWaters at the National Center for Supercomputer Applications or NCSA; and a series of machines culminating with the current Yellowstone cluster at the National Center for Atmospheric Research or NCAR). COLA has generated or obtained several petabytes of output from these models, building a core competency in data acquisition and management and assisting collaborators from other institutions.
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COLA has developed new approaches for climate research
COLA has developed or contributed to several new methods that have become standard or are soon to be adopted by climate researchers, including:
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COLA has pioneered work on and demonstrated the importance of land-atmosphere interactions and, in particular, in modulating the regional effects of remote forcing by ENSO or other oceanic anomalies.
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COLA pioneered the interactive ensemble methodology in which multiple atmospheric realizations are integrated simultaneously and averaged at each time step before being coupled to the ocean model.
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COLA has been at the forefront of developing and understanding the potential for using multi-model ensembles to improve seasonal predictions.
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COLA has leap-frogged the relatively slow historical pace of model resolution enhancement to produce climate simulations at what are considered to be numerical weather prediction resolutions, which has demonstrated that significant improvements can be realized in several aspects of climate simulation and prediction by resolving key processes and phenomena.
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COLA has further developed and refined various methods of model intervention to ascertain the mechanisms behind climate variability and predictability, including:
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the pacemaker (regional coupling) approach, originally developed at GFDL, to isolating the roles of ocean forcing and truly coupled dynamics, and
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interrupting the land-atmosphere feedback loop to determine the relative roles of atmosphere and land surface.
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COLA has made fundamental contributions to climate applications of information theory
COLA research has developed the capability to frame predictability and prediction issues in cutting edge information-theoretic terms, developing a series of both deterministic and probabilistic metrics for quantifying predictability and prediction skill, which has immensely clarified the issues confronting the research program and enabled new research studies. This is further described in Section 2.1.
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COLA provides and supports a unique, widely-used suite of tools
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