Coupling Metrics to Diagnose Land-Atmosphere Interactions

A "Cheat Sheet" for the Community

Produced for GEWEX/GLASS as part of a NASA-sponsored project. Also accessible at: http://tiny.cc/l-a-metrics

Latest update: June 2018 (V2.6):

Added: Memory Decomposition, Efficiency Space, Drawdown Interval Coupling, Generalized Efficiency Feedback Analysis (GEFA), General EF-SM Coupling, Mutual Information, Connectivity Analysis, and Temporal Information Partitioning (TIP)

Name Land State Surf. Fluxes Atm. State Local Space Local Time Obs' ble Type
Mixing Diagrams N Y Y Y Y Y Physical
LCL Deficit N N Y Y Y Y Physical
Priestley-Taylor Ratio N Y Y Y Y Y Physical
Heated Condensation Framework N Y Y Y Y Y Physical
Relative Humidity Tendency N Y Y Y Y Y Physical
Convective Triggering Potential / Humidity Index N N Y Y Y Y Physical
Triggering Feedback Strength / Amplification Feedback Strength N Y Y Y Y Y Physical
SM-T Metric N Y Y Y Y Y Physical
Bulk Recycling Ratio N Y Y N N Y Physical
Vegetated Coupling (Little Omega)
Ek et al. (2016; supplement)
N Y Y Y Y N Physical
Latent Heating Tendency Y Y Y Y Y N Physical
Coupling Drought Index Y N Y Y N Y Physical
Memory Decomposition Y Y Y Y N Y Physical
Efficiency Space Y Y Y Y N Y Physical
Drawdown Interval Coupling Y N Y Y N Y Physical
Generalized Efficiency Feedback Analysis (GEFA) Y Y Y N N Y Physical
General EF-SM Coupling Y Y Y Y N Y Physical
Correlations Y Y Y Y Y Y Statistical
Two-Legged Metrics Y Y Y Y Y Y Statistical
Betts Relationships Y Y Y Y N Y Statistical
Notaro's Feedback Parameter Y Y Y Y N Y Statistical
Conditional Correlation Y Y Y Y N Y Statistical
Granger Causality Y Y Y N N Y Statistical
Probit SM-P Causality N Y Y Y N Y Statistical
Zeng's Gamma Y Y Y Y Y Y Statistical
Precipitation-Temperature Metrics N N Y N N Y Statistical
Soil Moisture Memory Y N N Y N Y Statistical
GLACE Coupling Strength Y Y Y Y Y N Statistical
Associated Predictability Ratio Y Y Y Y Y N Statistical
Mutual Information Y Y Y N N Y Statistical
Connectivity Analysis Y N Y N N Y Statistical
Temporal Information Partitioning (TIP) Y Y Y Y N Y Statistical
Columns: Does method require terrestrial (Land) or atmospheric (Atm) variables, or surface flux data? Is it limited to local in space (no horizontal relationships, only in the vertical) or in time (no lagged relationships)? Can it be applied only to model output (Obs'ble=N)? Is the Type primarily a statistical metric (physical linkages implied) or based directly in physical processes?