A network of eddy covariance flux towers enabled the detailed study of micrometeorological and ecosystem responses to a total solar eclipse.
Cyclic variations in solar energy at the Earth’s surface is the reason we experience changes in weather and the driver of the natural rhythms of ecosystems. Solar eclipses offer the rare chance to study how the weather and ecosystems respond to an abrupt environmental disruption of known intensity and duration—allowing for an outdoor controlled light experiment at the scale of whole ecosystems. This enables novel analyses of ecosystem processes and biosphere-atmosphere interactions. Additionally, rare natural events such as a total solar eclipse captures the attention of the public, which can be the starting point for discussions that advance the general science education.
Knowledge of these ecosystems responses to such an abrupt perturbation of the forces driving energy, water, and carbon through those systems can inform models that scientists use to forecast weather or evaluate probable effects of future climate on ecosystems.
Mid-Missouri experienced up to 2 minutes 40 seconds of totality at around noontime during the total eclipse of 2017. We conducted the Mid-Missouri Eclipse Meteorology Experiment (MMEME) to examine land-atmosphere interactions during the eclipse. Here, research examining the eclipse responses in three contrasting ecosystems (forest, prairie, and soybeans) is described. There was variable cloudiness around at the beginning and end of the eclipse at the forest and prairie, however, skies cleared during the eclipse. Unfortunately, there were thunderstorms at the soybean site, which masked the eclipse effect and exposed the field to cold outflow. Turbulence and wind speeds decreased during the eclipse at all sites. However, there was amplified turbulent intensity at the soybean during the passage of a gust front. Evaporation and heating of the atmosphere by the land surface shut off during the eclipse as air became more stable, with the atmosphere actually supplying some heat to the surface at totality. Although the eclipse had a large effect on surface energy balances, the air temperature response was relatively muted due to the absence of topographic effects and the relatively moist land and atmosphere.
Contact (BER PM)
Daniel Stover, SC-23.1,
Terrestrial Ecosystem Science
Jeffrey Wood, University of Missouri
Lianhong Gu, Oak Ridge National Laboratory
National Aeronautics and Space Administration, Goddard Space Flight Center
U. S. Department of Energy Biological and Environmental Research, Terrestrial Ecosystem Science
United States Department of Agriculture-Agricultural Research Service
National Science Foundation, Missouri EPSCoR
Wood JD, EJ Sadler, NI Fox, ST Greer, L Gu, PE Guinan, AR Lupo, PS Market, SM Rochette, A Speck, and LD White. “Land-atmosphere responses to a total solar eclipse in three ecosystems with contrasting structure and physiology.” Journal of Geophysical Research: Atmospheres 124(2), 530-543 (2019). [DOI: 10.1029/2018JD029630]
SC-23.1 Climate and Environmental Sciences Division, BER
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