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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union

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Earth Surf. Dynam., 4, 211-235, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Mar 2016
Designing a suite of measurements to understand the critical zone
Susan L. Brantley1, Roman A. DiBiase1, Tess A. Russo1, Yuning Shi2, Henry Lin2, Kenneth J. Davis3, Margot Kaye2, Lillian Hill2, Jason Kaye2, David M. Eissenstat2, Beth Hoagland1, Ashlee L. Dere1,a, Andrew L. Neal4, Kristen M. Brubaker5, and Dan K. Arthur4 1Earth and Environmental Systems Institute and Department of Geosciences, Pennsylvania State University, PA, USA
2Department of Ecosystem Science and Management, Pennsylvania State University, PA, USA
3Earth and Environmental Systems Institute and Department of Meteorology, Pennsylvania State University, PA, USA
4Earth and Environmental Systems Institute, Pennsylvania State University, PA, USA
5Department of Environmental Studies, Hobart and William Smith Colleges, NY, USA
anow at: Department of Geography and Geology, University of Nebraska Omaha, NE, USA
Abstract. Many scientists have begun to refer to the earth surface environment from the upper canopy to the depths of bedrock as the critical zone (CZ). Identification of the CZ as an integral object worthy of study implicitly posits that the study of the whole earth surface will provide benefits that do not arise when studying the individual parts. To study the CZ, however, requires prioritizing among the measurements that can be made – and we do not generally agree on the priorities. Currently, the Susquehanna Shale Hills Critical Zone Observatory (SSHCZO) is expanding from a small original focus area (0.08 km2, Shale Hills catchment), to a larger watershed (164 km2, Shavers Creek watershed) and is grappling with the prioritization. This effort is an expansion from a monolithologic first-order forested catchment to a watershed that encompasses several lithologies (shale, sandstone, limestone) and land use types (forest, agriculture). The goal of the project remains the same: to understand water, energy, gas, solute, and sediment (WEGSS) fluxes that are occurring today in the context of the record of those fluxes over geologic time as recorded in soil profiles, the sedimentary record, and landscape morphology.

Given the small size of the Shale Hills catchment, the original design incorporated measurement of as many parameters as possible at high temporal and spatial density. In the larger Shavers Creek watershed, however, we must focus the measurements. We describe a strategy of data collection and modeling based on a geomorphological and land use framework that builds on the hillslope as the basic unit. Interpolation and extrapolation beyond specific sites relies on geophysical surveying, remote sensing, geomorphic analysis, the study of natural integrators such as streams, groundwaters or air, and application of a suite of CZ models. We hypothesize that measurements of a few important variables at strategic locations within a geomorphological framework will allow development of predictive models of CZ behavior. In turn, the measurements and models will reveal how the larger watershed will respond to perturbations both now and into the future.

Citation: Brantley, S. L., DiBiase, R. A., Russo, T. A., Shi, Y., Lin, H., Davis, K. J., Kaye, M., Hill, L., Kaye, J., Eissenstat, D. M., Hoagland, B., Dere, A. L., Neal, A. L., Brubaker, K. M., and Arthur, D. K.: Designing a suite of measurements to understand the critical zone, Earth Surf. Dynam., 4, 211-235,, 2016.
Publications Copernicus
Short summary
In order to better understand and forecast the evolution of the environment from the top of the vegetation canopy down to bedrock, numerous types of intensive measurements have been made over several years in a small watershed. The ability to expand such a study to larger areas and different environments requiring fewer measurements is essential. This study presents one possible approach to such an expansion, to collect necessary and sufficient measurements in order to forecast this evolution.
In order to better understand and forecast the evolution of the environment from the top of the...