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What is the Coupling Metrics Toolkit?

The Coupling Metrics Toolkit (CoMeT) brings together many commonly used land-atmosphere coupling metrics into a single, standardized set of Fortran 90 modules. Calculate everything from soil moisture retention over time, to the link between convective initiation and surface properties are available.

What is a 'Coupling Metric'?

Land-atmosphere coupling has come to mean quite a few things. Within the context of the Coupling Metrics Toolkit (CoMeT), land-atmosphere interactions follow the paradigm outlined by the Local Land-Atmosphere Coupling (LoCo) Project as part of the Global Land-Atmosphere System Study Panel (GLASS) efforts under the Global Water and Energy Exchanges Project (GEWEX). Here land-atmosphere coupling metrics are intended to quantify process relationships between the land surface and atmosphere and attempt answer questions such as: 1) Do changes in soil moisture promote changes in cloud cover or precipitation? 2) Are positive or negative feedbacks produced by soil anomalies? By addressing these questions, improvements can be made to model processes and ultimately increase predictability of impactful phenomena, such as drought and where convection is likely to be triggered.

Goals

Enable quick, early, and broad adoption of the latest and most useful land-atmosphere coupling metrics.

Apply to Data

Take the fortran 90 module of choice and write a wrapper code around it which calls the CoMeT modules. This way specific metrics can be calculated for existing model output, reanalysis, or observations.

Portable

All metrics are available in a format readily portable and called from NCAR Common Language.

List of Available Metrics

Convective Triggering Potential

Evaluates morning atmospheric profiles to determine whether dry or wet soils are more likely to trigger convection

Heated Condensation Framework

Assess the atmospheric background state with respect to convective initiation and identifies local versus non-locally triggered moist convection

Mixing Diagrams

Uses the diurnal covariation of temperature and humidity to quantify heat and moisture fluxes into the planetary boundary layer

Relative Humidity Tendency

Returns the contribution of surface energy fluxes, dry air entrainment, heat entrainment, and boundary layer growth to changes in top of boundary layer relative humidity

Terrestrial Coupling Index

Quantifies the degree to which soil moisture variations control changes in surface energy fluxes

Soil Moisture Memory

Determines the timescale at which initial soil moisture anomalies are retained over time

Download from command line by typing:

Zip file from github:

git clone https://github.com/abtawfik/coupling-metrics.git

Download as a zip

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