Understanding the 3D Hydrodynamics of Lake Tanganyika: Insights from
Modeling Circulation Patterns using a 3D ROMS Model
Abstract
In this study, we analyze the circulation patterns in Lake Tanganyika, a
large, economically important water body in East and Central Africa,
which has experienced significant warming in recent decades. Using the
Regional Ocean Modeling System (ROMS) model with a 2.1 km resolution
grid and 16 vertical layers, we examine thermal stratification,
wind-driven processes, and circulation dynamics. Our results show
seasonal variations in surface water temperature caused by changes in
air temperature and wind conditions. Primary upwelling occurs in the
southern regions from May to August, while secondary upwelling is seen
in the northern areas from November to February consistent with previous
instrumental studies. Bathymetry affects both upwelling and downwelling
circulation. Our findings highlight the interplay between atmospheric
and hydrodynamic factors controlling nutrient distribution within the
lake driven by internal circulation. These insights underscore the
importance of continuous monitoring and collaborative management to
protect Lake Tanganyika’s ecosystem amid climate change.