Summary:

Introduction
- This document provides a technical description of version 5.0 of the Community Land Model (CLM5.0).
- It covers the biogeophysical and biogeochemical parameterizations and numerical implementation of CLM5.0.
- The scientific justification and evaluation of these parameterizations are available in the referenced scientific papers.
- This document and the CLM5.0 User's Guide together provide the user with the scientific description and operating instructions for CLM.

Key Features
- The document includes a list of figures and tables that cover various aspects of the land model, such as land processes, subgrid hierarchy, radiative fluxes, heat and water fluxes, soil temperature and hydrology, snow hydrology, biogeochemical processes, and more.
- The tables provide detailed information on plant functional types, soil layers, atmospheric inputs and outputs, physical constants, optical properties, aerodynamic parameters, and various model parameters.
- The document acknowledges the substantial contributions of many members of the Land Model and Biogeochemistry Working Groups to the development of the Community Land Model since its inception in 1996.

Purpose
- The purpose of this document is to fully describe the biogeophysical and biogeochemical parameterizations and numerical implementation of version 5.0 of the Community Land Model (CLM5.0).
- This document, together with the CLM5.0 User's Guide, provides the user with the scientific description and operating instructions for CLM.