LEO#3_Nate

The Program Committee has scheduled a tour for attendees to visit the Landscape Evolution Observatory (LEO) on Wednesday afternoon, 23 October.

The LEO at Biosphere 2-The University of Arizona consists of three identical, sloping, 333 m2 convergent landscapes inside of a 5,000 m2 environmentally controlled facility.

These engineered landscapes contain 1-meter depth of basaltic tephra, ground to homogenous loamy sand that will undergo physical, chemical, and mineralogical changes over many years. Each landscape contains a spatially dense sensor and sampler network capable of resolving meter-scale lateral heterogeneity and sub-meter scale vertical heterogeneity in moisture, energy, and carbon states and fluxes. The density of sensors and frequency at which they can be polled allows for data collection at spatial and temporal scales that are impossible in natural field settings.

Embedded solution and gas samplers allow for quantification of biogeochemical processes, and facilitate the use of chemical tracers to study water movement at very high spatial resolutions. Each ~600 metric ton landscape has load cells embedded into the structure to measure changes in total system mass with 0.05% full-scale repeatability (equivalent to less than 1 cm of precipitation). This facilitates the real time accounting of hydrological partitioning at the hillslope scale. Each hillslope is equipped with an engineered rain system capable of raining at rates between 3 and 45 mm/hr in a range of spatial patterns. The rain systems are capable of creating long-term steady state conditions or running complex simulations. The precipitation water supply storage system is flexibly designed to facilitate addition of tracers at constant or time-varying rates for any of the three hillslopes.

The tour will include a brief slide show introduction to LEO, followed by a walk-through with the Biosphere 2 scientists most closely involved in the project.

View more information about the LEO project.