Adding SPAC to the bucket model & other improvements for AMIP

Purpose

The purpose of this SDI is to outline the needed steps to make the ClimaLSM BucketModel more realistic, including

the effects of the canopy on surface fluxes (through albedo, surface resistance, roughness lengths)
more realistic representation of the land albedo (reading from NetCDF files)

We will not be considering multi-band albedo at this stage. Though the SPAC model is general and models the radiation hyperspectrally, and with multiple layers in the canopy, the plan is not to carry out the simulation in this mode. Instead, the number of layers would be set to 1, and the albedo(wavelength) function will be reduced to a single value, integrating over wavelength.

Cost/benefits/risks

An analysis of the cost/benefits/risks associated with the proposal.

Producers

A list of the resources and named personnel required to implement the Proposal.

Components

A description of the main components of the software solution.

Inputs

A description of the inputs to the solution (designs, references, equations, closures, discussions etc).

Results and deliverables

A description of the key results, deliverables, quality expectations, and performance metrics.

Task breakdown

A preliminary list of PRs and a preliminary timeline of PRs, milestones, and key results.

125 reads albedo in from a file (intermediate step to computing albedo with SPAC)
124 implements the evaporation model from Manabe (beta factor)
Create field of SPAC structs, add option to Bucket Model to add this in
Modify SurfaceFluxes to handle a resistance term in evaporation, and read in a map of resistances from CLM (or compute)
Solar zenith angle and azimuth angle: (1) coupler can pass the solar zenith angle and azimuth (coupled runs), but (2) land model would compute this in standalone runs (obtain lat/lon from the simulation domain, and t is the UTC time used in timestepping the simulation, which update_aux has access to)
Read in radiation, atmospheric conditions, etc. from NetCDF instead of prescribing as functions for standalone runs.

Reviewers

The names of CliMA personnel who will review the Proposal and subsequent PRs.

CliMA / ClimaLand.jl