Seeking Closure to Better Understand Earth’s Energy Balance and Water Resources
Accounting for the total energy budget of Earth’s ecosystems has real-world implications for water resource management, land use policy, and monitoring of crop conditions.
Earth’s surface and atmosphere continuously exchange energy and gases like water vapor and carbon dioxide through processes like evapotranspiration, photosynthesis, and respiration. For centuries, measuring these exchanges, which regulate weather, climate, and carbon cycling, has been a challenge for scientists. In the 1970s, John Monteith highlighted the difficulty of measuring evaporation, calling it "the most desperate branch of this desperate science" of meteorology due to lacking techniques.
Today, reliable measurements and models of surface-atmosphere exchanges are crucial for addressing urgent issues like population growth and changing water availability. Despite advances, researchers face the energy balance closure (EBC) problem, where the measured sum of surface-atmosphere fluxes doesn't match the available energy within the ecosystem, violating fundamental energy conservation principles.
Eddy covariance systems, using towers with wind and gas sensors, are the preferred method for measuring field-scale evapotranspiration and gas exchanges. However, the EBC problem persists, limiting the advancement of techniques to address measurement uncertainties and potentially influencing decisions on agriculture, energy production, water allocation, ecosystem services, and weather adaptation strategies.
To tackle this issue, the eddy covariance community is working together to develop best practices for collecting, correcting, analyzing, and applying EC measurements and datasets.
Written by urgent.news from Eos's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
