Electrical measurement of unconsolidated soils in the laboratory.

Provenance: Lee Slater, Rutgers University-Newark
Reuse: This item is in the public domain and maybe reused freely without restriction.
Archie (1950) defined the term petrophysics to describe the study of the physics of rocks, particularly with respect to the fluids they contain. Although originally focused on geophysical exploration, petrophysics concepts are now used to interpret near surface geophysics measurements made to address environmental and engineering problems. This unit investigates relationships between these geophysical measurements and the physical and chemical properties of soils and sediments in the Earth's near subsurface. The specific focus is on the electrical properties of soils and how they are related to the ionic concentration of the pore fluids, the water content, porosity and grain size. Field results from a geophysical survey performed in Kearny Marsh, close to Harrier Meadow, are included to illustrate how electrical conductivity of a soil measured with an electromagnetic sensor is a good proxy for pore fluid ionic concentration, in this case related to contamination from a bordering landfill.

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In this unit, students work in small groups to examine and analyze spatial data relevant to soils to identify patterns. They use their analyses to add detail to their Earth systems concept maps and describe how these data are relevant to interdisciplinary societal issues.

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In Unit 2, students learn how the techniques for water budgeting (covered in Unit 1) can be used to monitor both groundwater (High Plains Aquifer) and surface water (western mountain watershed) systems. Students interpret time-series plots that show the impact of drought years and wet years on underground water storage in the High Plains Aquifer and on snowpack and surface runoff in the western mountain watershed. They also consider the societal implications of water deficits through a series of pre-class readings, questions embedded in the assignments, and small and whole-group discussions. This unit can involve substantial computer time during which students use Excel to view and interpret hydrologic data. An alternative version with hard-copy graphs is also provided.

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Online-adaptable: Both parts of this unit are completely digital and thus at a logistical level it can be switched to online fairly easily. However, due to the relative complexity of the data investigations, there will still be quite a bit of instructor support needed and/or extended small group that should be arranged.

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Armed with an overview of the complexity of issues associated with global food security, this unit begins by contextualizing food security as an example of a wicked problem. Wicked problems are problems that are unsolvable in the traditional sense, and have complex multiscalar causal factors that contribute to the creation of new issues as old ones are addressed. Both global food security and climate change are examples of wicked problems. This unit presents systems thinking as a way to identify complex problems and explore solutions. Using a flipped classroom model, students complete a self study tutorial that presents system concepts in the context of Earth system science. The slide stack includes two guided activities related to the carbon cycle and soils. A short reading, "Why Systems Thinking?" and a video clip is included in the tutorial. Authentic assessment of the homework activity is an Earth system diagram connected to one of the issues of global food security from Unit 1 that they will bring to class. After a short class discussion that introduces concepts of sustainability and ecosystem services as related to food production, students are broken into groups and are asked to create their own systems diagram of the global food system, using the organizational systems concepts they examined as homework and the introduction activities of Unit 1. After completing the diagrams, students examine a food system diagram example, and identify the components of the system using standardized systems language. Students can photograph their diagrams or make quick sketches so they have a working copy to include with their notes.

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Students will explore the different aspects of the carbon cycle on Earth. This includes the original source of all the carbon on our planet, the near ubiquity of carbon, the six principle reservoirs of carbon in the Earth system, and the movement (flux) of carbon between reservoirs. Students will approach the chemical history of carbon by personifying the "journey" of specific carbon atoms throughout geologic time.
The unit emphasizes the grand challenges of energy resources and climate change by grounding these issues in a solid understanding of carbon from a systems thinking perspective. The point here is for students to gain a more robust appreciation for the movement of carbon between atmosphere and geosphere, between hydrosphere and biosphere. The unit provides dynamic understanding of how perturbations to one sphere or changes in the amount of carbon in a given reservoir can have implications throughout the Earth system.

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Students will be introduced to the concept of a natural cycle. They are first asked to identify the different components of the hydrologic cycle. Students will be able to recognize the delicate balance between the individual elements of a large and complex system. Students will also be able to identify the interactions among parts of a natural system.

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In this unit, students are introduced to the concept of a natural cycle. They are first asked to identify the different components of the hydrologic cycle in Spanish. Students will be able to recognize the delicate balance between the individual elements of a large and complex system. Students will also be able to identify the interactions among parts of a natural system.

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Unit 2 engages students in topics related to the water cycle, both from natural and urban system perspectives. Students are assigned approximately 30 minutes of reading (short article) and are required to watch a 15-minute video before class to gain a basic understanding of the natural and urban water cycles, their components, and the impact of urbanization on runoff. Through short lectures, discussion questions, solution to example problems, and a group activity, students gain comprehension of the water cycle components, their spatial and temporal variability, water budget calculation, and the impacts of urbanization on surface water.

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Unit 2 opens a window into water accounting and reveals intensive water use that few people think about. How much water goes into common commodities? Have you considered how much water it takes to support our modern American lifestyle and agricultural trade? Water that is embedded in products and services is called virtual water. Looking at the world through the lens of virtual water provides a watery focus to thorny discussions about water such as: the pros and cons of globalization and long distance trade; self sufficiency vs. reliance on other nations; ecosystem impacts of exports; and the impacts of relatively cheap imports on indigenous farming. Unit 2 also introduces the concept of a water footprint. A water footprint represents a calculation of the volume of water needed for the production of goods and services consumed by an individual or country. In this unit students will calculate their individual footprints and analyze how the water footprints of countries vary dramatically in terms of gross volumes and their components. As a result of these activities, students will learn of vast disparities in water access and application. They will also be challenged to consider mechanisms or policies that could foster greater equity in water footprints.

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This unit applies a flipped classroom model. Students complete a self-study tutorial prior to attending class. Students are then asked work independently or in pairs to generate a time-aware climate change Web map application using ArcGIS Online. Returning to the theme of cocoa production introduced in Unit 1, students identify climatic conditions conducive for cacao production around the world, especially West Africa where the majority of cacao is grown. Students then use a web application in ArcGIS Online to create a time aware map showing biomes in the KÃppen Climate Classification System and determine how projected climate changes will impact the suitable production regions for cacao in West Africa. Using a jigsaw model, students collect into groups of 4, with a representative from each of the IPCC scenarios, and they compare the the impact of the 4 scenarios in specified cocoa production regions. At the end of the class they will be assigned to one of three regional areas for group work in Units 4-6.

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This unit is designed to allow students to quantitatively assess how much water is used for irrigating crops and how this varies across the United States. This unit also has students link water use to the economic value of the crops that are produced--spanning the scientific and economic disciplines. The concepts that students learn here will connect back to the Water Footprint concept that was introduced in Unit 2, as students consider the accuracy of water calculators.

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After an opening discussion of systems thinking and models, student use webDICE , an online Dynamic Integrated Climate Economy model developed by Center for Robust Decision Making on Climate and Energy Policy at the University of Chicago. Students will manipulate input parameters and interpret output in small groups in-class and individually out of class to complete the major mid-module assignment. The goal is to develop their understanding of the sources of uncertainty around future predictions of climate change and its impacts. Students are also introduced to the concept of Social Cost of Carbon (SCC) which is central to subsequent units in this module.

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Near surface geophysical measurements are performed by moving sensors across the Earth's surface. Active geophysical sensors transmit a signal into the Earth and record a returned signal that contains information on the physical and chemical properties of the Earth (see Unit 2). This unit introduces the student to the basics of geophysical data acquisition using two techniques that record variations in the electrical conductivity (see Unit 2) of the Earth: [1] electrical imaging (EI), and [2] electromagnetic (EM) conductivity mapping.











Basic concept of electrical imaging measurements

Provenance: Lee Slater, Rutgers University-Newark
Reuse: This item is in the public domain and maybe reused freely without restriction.
Electrical imaging is a galvanic geophysical approach whereby electrical contact with the Earth is made directly via electrodes (typically metal stakes) that are inserted into the ground. Electromagnetic conductivity mapping is a non-contact approach whereby the physics of EM induction is used to sense changes in electrical conductivity. The advantages and disadvantages of using galvanic (EI) and non-contact (EM) techniques for measuring electrical conductivity are described. Ohm's Law is introduced and students investigate how electrical resistance measurements are related to the electrical conductivity of soils. Field implementation of both EI and EM techniques is demonstrated using surveys performed in Harrier Meadow as an example. Students investigate how variations in survey configuration parameters (e.g. electrode configuration and electrode spacing in EI, frequency and coil spacing in EM) control investigation depth (how far into the ground the signals sense) and spatial resolution (what size objects can be detected). The concept of pre-modeling a geophysical survey (i.e. running some simulations of likely effectiveness of the methods before going to the field) to evaluate expected investigation depth and sensitivity is introduced. The Excel-based Scenario Evaluator for Electrical Resistivity (SEER) tool provided by the United States Geological Survey (USGS) is used to demonstrate some key concepts.

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In the capstone, Unit 3, students are provided a real-world example of local community action to address the challenge of "healthy food access." The 2015 Leon County (Florida) Sustainable Communities Summit highlights the results of communities working together to promote environmental and food justice. By the end of Unit 3, instructors can deliver a call to action to empower students to be participatory citizens in their communities. The summative assessment will evaluate the students' ability to synthesize the module learning objectives and demonstrate the use of science practices.

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What is the contribution of melting ice sheets compared to other sources of sea-level rise? How much is the sea level projected to increase during the twenty-first century? In this unit students will use Gravity Recovery and Climate Experiment (GRACE) ice-mass loss time series from Greenland and Antarctica to calculate sea-level rise due to the addition of freshwater inputs from melting ice sheets, and use Interferometric Synthetic Aperture Radar (InSAR) ice-velocity data to extrapolate which regions of the ice sheets are losing the greatest mass. Sea-level rise from melting ice sheets is then contrasted to the other dominant causes of sea-level rise, including thermal expansion, melting glaciers, and changes in land water storage. Lastly, students will extrapolate how much sea-level rise will occur by year 2100 based on recent observed rates of sea-level rise and compare these values to sea-level rise projections from the Intergovernmental Panel on Climate Change.

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Online-ready: The exercise is electronic and could be done individually or in small online groups. Lecture is best done synchronously due to the technical nature. Discussion would be better that way too.

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Students will be able to identify the functional roles that organisms play in ocean ecosystems. How do human-induced changes in ocean conditions affect biodiversity, and thereby the health and resilience of a coral reef? Students explore and discuss the direct and indirect impacts that ocean acidification can have on species, food web dynamics, ecosystem function, and commercial resources. At the end of this unit the students should be able to articulate how changes in ocean chemistry can create negative outcomes for humans who depend on living ocean resources.

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In this unit students will explore surface water and its relationship to the water cycle via watersheds and drainage divides. These topics will inform their analysis of the social and environmental impacts of the planned increase of hydroelectric dams in the Amazon. Case studies include the Ene River and the MaraÃÃn River in Peru.

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In this unit, students work in small groups to collect and record data about soils using various soil testing and classification methods at a series of stations. The methods they use are relevant to the societal issue of their choice that involves soil. Through this process of testing, data collection, and interpretation, they develop the baseline soil content knowledge and skills necessary to create their own Soils, Systems, and Society Kit.

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Unit 3 communicates the critical need for management of fresh water and ways in which citizens may take part in its conservation and restoration. Students explore the relationships between watersheds, drainage divides and the hydrologic cycle using a case study from the Hawaiian Islands involving surface water diversions from a region inhabited by indigenous people to a region comprised of large-scale agricultural fields.

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Students will identify potential stakeholders and assess the importance of communication and interaction among these groups to make recommendations on how to define and develop prepared communities.

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