MyLake (v.1.1): Technical model documentation and user's guide for version 1.1

Abstract

MyLake (Multi-year simulation model for Lake thermo- and phytoplankton dynamics) is a one-dimensional process-based model code for simulation of daily 1) vertical distribution of lake water temperature and thus stratification, 2) evolution of seasonal lake ice and snow cover, and 3) phosphorus-phytoplankton dynamics. MyLake has a relatively simple and transparent model structure, it is easy to set up, and is suitable both for making predictions and scenarios, and to be used as an investigative tool. Short runtime allows application of comprehensive sensitivity and uncertainty analysis as well as simulation of a large number of lakes or over long periods (decades). MyLake aims to include only the most significant physical, chemical and biological processes in a well-balanced and robust way. The technical part of this report (sections 2-4 and Appendix A) gives a detailed description of the different processes and algorithms included in MyLake (v.1.1) model code. Section 5 gives brief instructions for setting up and running a MyLake (v.1.1) model application, while in section 6 some examples of MyLake model output are presented.