Digital Commons Network^™

Evolution Of Global Sea‐Level Rise Projections And Their Uncertainty, Andra J. Garner, Amy Appollina, Jessica Slotter, Gregory G. Garner, Aimée B. A. Slangen, Robert E. Kopp, Benjamin P. Horton

School of Earth, Environment, and Society Faculty Publications and Presentations

For more than 40 years, scientists have projected future sea‐level change. Documenting how sea‐level projections have evolved is vital for tracking progress, uncertainties, and future research needs. Here, we update and analyze a database of global‐mean sea level (GMSL) projections dating from 1982 to 2025, identifying five key findings. First, GMSL projection generation has been concentrated in a small number of developed countries, with 95% of projections produced in the United States, United Kingdom, European Union, or Australia. Second, while GMSL projections for 2050 and 2100 have been published regularly since the early 1980s, only 30 of 103 studies have …

Statistical Model Of Subsurface Scattering Bias In Icesat‐2'S Atl06 Product, Thilini Bamunu Arachchige, Kelly E. Gleason, Jonathan C. Ryan, Markus Allgaier

Environmental Science and Management Faculty Publications and Presentations

ICESat‐2 uses visible laser pulses and photon‐counting detectors to range the Earth's surface, providing precision altimetry for measuring ice sheet elevation change. However, since water ice is transparent to visible light, the photon returns recorded by ICESat‐2's ATLAS instrument may originate from subsurface scattering inside the snow or glacier ice volume, making the surface appear lower than it is. Here, we develop a Monte Carlo Radiative Transfer model to characterize the potential bias caused by subsurface scattering in snow and ice. Our model allows us to study the subsurface scattering bias in relation to photon number, scattering coefficient, and slope …

You Burn With Us: How Fire Functions In Suzanne Collins' The Hunger Games Trilogy, Lucy Evans

University Honors Theses

This paper examines Suzanne Collins' The Hunger Games trilogy and how fire behaves as a multifaceted element that constructs, exposes and transforms power. Through tracing the development of the protagonist, Katniss Everdeen, this research explores how fire evolves from a weapon into a symbol for revolution. This analysis uses the framework of other dystopian novels, and previous character analysis of The Hunger Games, to understand Katniss's role in the revolution of Panem. It does so through three main behaviors: the construction of Katniss's "girl on fire" persona that commodifies her for the capitol's gain; the exposure of the state's …

Not Everyone Gets A Tree: Housing Values, Street Trees, And Equity In Portland, Matthew Moller

University Honors Theses

Street trees are positively associated with Portland home sale prices, but exposure and capitalization are uneven by race/ethnic neighborhood context. Urban trees are ecological assets, but their economic and equity implications remain uneven. This thesis examines street-tree exposure and 2023 residential sale prices in Portland, Oregon (n = 6,414) using a mixed-methodology hedonic design. Ordinary least squares models measure inventoried street-tree counts within 20m, 50m, and 100m buffers together with structural controls and census-block racial and ethnic context. Trees are positively and significantly associated with logged prices at all radii, with scale-sensitive magnitudes and modestly better fit as wider buffers. …

A Laboratory-Based Spectrometer Intercomparison For The Measurement Of Snow Spectra, Benjamin M. Roberts-Pierel, Christopher J. Crawford, Steven W. Brown, Raymond F. Kokaly, Kelly E. Gleason, Anne W. Nolin, Edward H. Bair, Brenton A. Wilder, Anton J. Surunis, S. Mckenzie K. Skiles, Multiple Additional Authors

Environmental Science and Management Faculty Publications and Presentations

Seasonal snow is an integral component of global hydrological systems, global energy budget and Earth's climate. As an important part of many Earth systems, seasonal snow is also an essential source of water for many human populations and ecosystems around the world. As such, the measurement of seasonal snow and characterization of uncertainty in those measurements is crucial. To elucidate potential uncertainty attributable to commonly used field spectrometers (and to a lesser extent imaging spectrometers) and associated reference panels, this work presents results from an intercalibration experiment conducted synchronously with the NASA 2023 Snow Experiment (SnowEx) Albedo campaign near Fairbanks, …

From Reclamation To Restoration: Remaking Nature On Portland's Peninsula, Theus Richards

University Honors Theses

This environmental history of the North Portland Peninsula is a critical case study of a landscape in transition, where new "natures" have been constructed through shifting projects of reclamation and restoration. The Port of Portland, who controlled the Peninsula, transformed the marshy bottomlands near the confluence of the Columbia and Willamette Rivers to accommodate greater networks of industrial infrastructure and expand their capacity for global trade. Beginning in 1967, the Port began dredging operations to fill Ramsey Lake to make way for the construction of Rivergate Industrial District. Through this process, Smith & Bybee Lakes were set aside as a …

Mapping Fire Management: A Spatial Social Network Approach, Christoph Neger, Cody Evers, Kapil Yadav, Octavio Romero Cuapio

Environmental Science and Management Faculty Publications and Presentations

Maps are an essential tool to inform fire governance and management. For instance, they can highlight which areas are most vulnerable to adverse fire impacts or be used to plan interventions for risk reduction and prevention. In recent years, several studies have mapped the fire management activities and the networks between the multitude of involved actors. They build upon previous advances to combine quantitative and qualitative social network analysis with geographical analysis and cartography, aiming to highlight areas of opportunity to enhance fire governance. This paper continues this line of research, examining cooperation in fire management within the south-eastern part …

Estimating Sediment Properties Using A New Source Level Function For Wind-Driven Underwater Sound Derived From Long-Term Archival Data, S Bruce Martin, Martin Siderius

Electrical and Computer Engineering Faculty Publications and Presentations

Wind-driven breaking waves generate the background sound throughout the ocean. An accurate source level for wind-driven breaking waves is needed for estimating the ambient sound levels needed for sound exposure modeling, environmental assessments, and assessing the detection performance of sonars. Previous models applied a constant roll-off of sound levels at -16 dB/decade at all wind speeds, and these models' source levels were flat at frequencies below ∼1000 Hz due to a lack of measurements. Here, we analyzed 16 long-term archival datasets with limited anthropogenic sound sources to estimate the wind-driven source level down to 100 Hz. We estimated the site-specific …

Linking Climate And Demography To Predict Population Dynamics And Persistence Under Global Change., Jennifer L. Williams, Amy L. Angert, Aldo Compagnoni, Ali Campbell, Megan L. Demarche, Margaret E K Evans, Joshua C. Fowler, Amy M. Iler, Jenna A. Loesberg, Allison M. Louthan, Scott W. Nordstrom, Multiple Additional Authors

Publications, Reports and Presentations

Predicting the effects of climate change on plant and animal populations is an urgent challenge for understanding the fate of biodiversity under global change. At the surface, quantifying how climate drives the vital rates that underlie population dynamics appears simple, yet many decisions are required to connect climate to demographic data. Competing approaches have emerged in the literature with little consensus around best practices. Here we provide a practical guide for how to best link vital rates to climate for the purposes of inference and projection of population dynamics. We first describe the sources of demographic and climate data underlying …

Future Vision And Action Recommendations, Sondoss Elsawah, Melissa Haeffner, Anthony Jakeman

Environmental Science and Management Faculty Publications and Presentations

Let us imagine a future world where water management is more fully integrated and supported by the science of sociohydrology and related metadisciplines. This is a vision for the future where the social, cultural, environmental, and economic values of water are explicitly considered through the lens of the science–water policy interface. The ultimate value of research will be measured by how much it supports improvements in water resources and hazards management and, in particular, completes and enriches the science–water policy interface.

Power And Planning: A Critical Discourse Analysis Of Tribal And Non-Tribal Oregon Wildfire Protection Plans, Christian J. Heisler, Max Nielsen-Pincus, Douglas Deur, Gabe Sheoships

Environmental Science and Management Faculty Publications and Presentations

Background:

Since the late 1800s, the US government has largely removed Indigenous fire stewardship practices from the landscape by implementing a top-down fire suppression system that criminalized traditional fire practices and denaturalized the role of fire in forested environments. A century of routine fire suppression produced dense, homogenous forests capable of sustaining high-intensity wildfire that exceeds the suppression capabilities of land management organizations in many regions, spurring federal leaders to modify management approaches. As part of this change, numerous federal policies and plans have advocated for further involvement of Native American tribes and incorporation of Indigenous knowledge within management decisions. …

Reining In Plasticulture From Land To Sea: Pacific Northwest (Usa) Perspectives On Agriculture And Aquaculture, Susanne M. Brander, Gail A. Langellotto, Minal T. Mistry, Sebastian L. Singleton, Mackenna A. Hainey, Lauren M. Kashiwabara, Kelsey Arthur, Elise F. Granek, Kervelle Baird, Ricardo Palazuelos, Multiple Additional Authors

Environmental Science and Management Faculty Publications and Presentations

Plastic use in food production—known as plasticulture—has transformed agriculture and aquaculture globally. Plasticulture gained momentum in the mid-20th century with the development of novel plastic materials, and by 2009, U.S. farmers used over 200 million pounds of plastic films annually. Though plastics have increased yields and efficiency, they now pose environmental hazards through the release of microplastics (MPs) and chemicals. Despite extensive documentation of MPs in the environment, their role in U.S. food production and impacts on crop, livestock, and aquaculture health remain underexplored. In regions like the Pacific Northwest (PNW), with robust agricultural and aquaculture sectors, plastics from films, …

The First Thirty Years Of Green Stormwater Infrastructure In Portland, Oregon, Michaela Koucka, Cara Poor, Jordyn Wolfand, Heejun Chang, Vivek Shandas, Adrienne Aiona, Henry Stevens, Tim Kurtz, Svetlana Hedin, Steve Fancher, Joshua Lighthipe, Adam Zucker

Geography Faculty Publications and Presentations

Over the past 30 years, the City of Portland, Oregon, USA, has emerged as a national leader in green stormwater infrastructure (GSI). The initial impetus for implementing sustainable stormwater infrastructure in Portland stemmed from concerns about flooding and water quality in the city’s two major rivers, the Columbia and the Willamette. Heavy rainfall often led to combined sewer overflows, significantly polluting these waterways. A partial solution was the construction of “The Big Pipe” project, a large-scale stormwater containment system designed to filter and regulate overflow. However, Portland has taken a more comprehensive and long-term approach by integrating sustainable stormwater management …

Nitrogen Fixation In Pampinifervens, A New Species-Rich Genus Of Aquificaceae That Inhabits A Wide Ph Range In Terrestrial Hot Springs., Marike Palmer, Nancy O. Nou, Lara A. Turello, Carolyn E. Power, John C. Ong, Jonathan K. Covington, Dengxun Lai, Xavier Mayali, Anna-Louise Reysenbach, Yan-Ling Qi, Jeremy A. Dodsworth, Yitai Liu, Multiple Additional Authors

Center for Life in Extreme Environments Publications

Members of the Aquificota play important roles in hydrogen, sulfur, and carbon cycles in geothermal systems as ubiquitous and abundant chemolithoautotrophs; however, their roles in the nitrogen cycle are poorly defined. Here, we show that Aquificaceae isolate T-2 from Tengchong, China, fixes nitrogen based on growth with dinitrogen as the sole nitrogen source and incorporation of N atoms when grown with N. We further show evidence that suggests its nitrogen fixation (nif) genes are transcribed in situ in a nearby spring. We propose the name Pampinifervens diazotrophicum gen. et sp. nov., with strain T-2 (= JCM 35475 = DSM 116324) …

The People's Rivers: Early Environmental Regulation And The Oregon State Sanitary Authority, Avery Morgan Fischer

Dissertations and Theses

The environmental movement in Oregon can trace its origins to the turn of the twentieth century, where citizen activism and initiative led to the creation of an early environmental regulatory agency, the Oregon State Sanitary Authority. This creation established that the State of Oregon had a duty to preserve, not just the navigability or usability of rivers and waterways, but the quality and purity of its water. The Oregon State Sanitary Authority played an active role in maintaining and protecting the environment as a mandate of the people, and throughout its thirty-year existence battling industrial polluters, reluctant municipalities, and disinterested …

Indigenous Cultural Healing In The Pacific Northwest: The Columbia River Tribes And The Potential Return Of The Falls, Cj Senn

University Honors Theses

This thesis examines the historical, cultural, and ecological significance of Celilo Falls (Wyam), a once-sacred Indigenous site on the Columbia River, and the profound impacts of its submergence by The Dalles Dam in 1957. It looks into the history of the area as well as the potential for a return of the falls in the future. Drawing from a mixed-methods approach that includes a systematic literature review and qualitative interviews with Indigenous scholars, elders, and community members, the study explores how the loss of Celilo Falls disrupted Indigenous governance, economies, and spiritual practices. It further investigates how Celilo continues to …

Increasing Soil Respiration In A Northern Hardwood Forest Indicates Symptoms Of A Changing Carbon Cycle, Angela R. Possinger, Charles T. Driscoll, Mark B. Green, Timothy J. Fahey, Chris E. Johnson, Mary Margaret K. Koppers, Lisa D. Martel, Jennifer L. Morse, Pamela H. Templer, Angelina M. Uribe, Geoffrey F. Wilson, Peter M. Groffman

Environmental Science and Management Faculty Publications and Presentations

Soil carbon dioxide (CO2) flux, or soil respiration, is a critical control on net ecosystem carbon (C) balance. Using long-term (2002-2020) measurements at the Hubbard Brook Experimental Forest (New Hampshire, U.S.), we show that soil respiration rates have notably increased since ~2015. In 2020, cumulative summer respiration flux was approximately 90% higher than the average summer flux over the 2002–2015 period. The increase in soil respiration cannot be explained directly by temperature or pH change alone. We also found that heterotrophic microbial C mineralization and microbial biomass C have also increased rapidly since ~2015, pointing towards an increase in the …

Rebuilding Consent: Fear, Trust, And The Future Of Nuclear Energy, Austin Dunham

University Honors Theses

This thesis traces the cultural and emotional roots of nuclear fear in the United States and explores how those inherited anxieties continue to shape public resistance to nuclear energy in the face of a worsening climate crisis. Drawing on personal narrative, risk perception theory, and the history of nuclear discourse - from Hiroshima to Chernobyl to today - the research examines how trust, rather than technology, remains the largest barrier to progress. By analyzing the stories we tell about energy, disaster, control, and overall perceived risk, this work asks what it would take for Americans to imagine nuclear energy not …

"Change Is All There Is": Exploring Journalistic Coverage Of Gentrification In The St. Johns Neighborhood Of Portland, Or, Eva Kovolitsky

University Honors Theses

Gentrification, as an increasingly significant characteristic of contemporary urban spaces, has been the subject of a vast body of literature. This has prompted further research into how gentrification is described and the implications of language used in both academic research and popular media accounts. This study explores discourse used in journalistic coverage of gentrification in the St. Johns neighborhood of Portland, Oregon. Guided by past work in discourse analysis and critical urban geography, this study attempts to understand how academic discourse on gentrification is both reflected in and divergent from neighborhood-level discourse. This study used data from the St. Johns …

Plural Water Narratives: An Environmental Justice Lens On A Systematic Review Of Q-Methodology Water Research, Melissa Haeffner, Alida Cantor, Janet Cowal, Andrea Bryant, Darius Mani Yaw, Kinna Je Palacios, Daniela Serna, Bryce Sprauer, Abigail Tran-Gruver

Environmental Science and Management Faculty Publications and Presentations

Environmental justice research has shown that people's experiences and perceptions of water differ because systematic inequalities shape the extent to which people access clean water and are exposed to water hazards. Q‐methodology is one technique that has been used to aggregate multifaceted subjective narratives and understand different perspectives on a topic. In this paper, we systematically review 77 case study articles applying Q‐methodology to water‐related topics, to inventory how people perceive their relationships with water. We create a classification system based on environmental justice theory to examine (1) distributive justice issues around alternative water sources and agricultural and urban water …

Unseen Connections: A Storymap Exploring Case Studies In Water-Energy Transitions And Environmental Justice, Alida Cantor, Elizabeth Bartholomew, Kate Berry, James Blair, Dustin Mulvaney, Nancee Hunter

Geography Faculty Publications and Presentations

Climate change is one of the most important challenges in the world today. Communities and decision makers at many levels, from local to international, are working to ensure that energy, water, and other societal infrastructures can transition and adapt to address climate change (IPCC, 2023). One major mitigation strategy involves the decarbonization of energy systems (Rockström et al. 2017). Despite wide recognition of the need to decarbonize globally, renewable energy infrastructures and technologies are often locally controversial, involving claims of environmental injustice and disputes over land and water (Cantor, Turley, and Maxfield 2023; Jerez, Garcés, and Torres 2021; Turley et …

Consumption Pressure In Estuaries Peaks At Intermediate Salinities, Catherine E. De Rivera, Amy A. Larson, Benjamin G. Rubinoff, Luna R. Soto, Seth L. Wright, Edwin D. Grosholz, Gregory M. Ruiz, Andrew L. Chang

Environmental Science and Management Faculty Publications and Presentations

The nature and strength of biotic interactions change along stress gradients, but the importance of these interactions across estuarine gradients is under studied. Here, we examined how consumption varies across estuarine salinity gradients by deploying standardized baits (‘squidpops’) to measure consumption pressure along the gradients of five estuaries in Oregon, USA. The relationship between consumption and stress was nonlinear: consumption pressure peaked slightly at mid salinity and decreased at low salinity, especially as temperature increased, in the five estuaries studied. This finding does not support either of two existing models for consumption across gradients, including the Consumer Stress Model and …

Leaden Circles, Eternal Springs, And Rusty Pumps: Time, Nature, And Industry In Mrs. Dalloway, Katherine Evans

Anthós

This article explores often-overlooked ecocritical aspects in Virginia Woolf’s Mrs. Dalloway, analyzing Woolf’s literary intersection of time, nature, and industry as a precursor to contemporary Anthropocene discourse. Acknowledging prevailing interpretations of Mrs. Dalloway through social lenses of trauma, class, and gender, Evans reveals how Woolf’s exploration of human-environment relationships is not only present but integral to interpreting the text fully. Drawing from textual close readings, scholarship on Woolf, and environmental humanities frameworks, Evans demonstrates how Woolf utilizes the Big Ben and a beggar woman to symbolize human-nature relationships. Evans’ ecocritical reading of Mrs. Dalloway repositions the 1925 novel within contemporary …

Equations To Predict Carbon Monoxide Emissions From Amazon Rainforest Fires, Sarah M. Gallup, Bonne Ford, Stijn Naus, John L. Gallup, Jeffrey R. Pierce

Economics Faculty Publications and Presentations

Earth systems models (ESMs), which can simulate the complex feedbacks between climate and fires, struggle to predict fires well for tropical rainforests. This study provides equations that predict historic carbon monoxide emissions from Amazon rainforest fires for 2003–2018, which could be implemented within ESMs’ current structures. We also include equations to convert the predicted emissions to burned area. Regressions of varying mathematical forms are fitted to one or both of two fire CO emission inventories. Equation accuracy is scored on r², bias of the mean prediction, and ratio of explained variances. We find that one equation is best …

From The Ocean To Our Kitchen Table: Anthropogenic Particles In The Edible Tissue Of U.S.. West Coast Seafood Species, Summer D. Traylor, Elise F. Granek, Marilyn Duncan, Susanne Brander

Environmental Science and Management Faculty Publications and Presentations

Microplastics (MPs) and other anthropogenic particles (APs) are pervasive environmental contaminants found throughout marine and aquatic environments. We quantified APs in the edible tissue of black rockfish, lingcod, Chinook salmon, Pacific herring, Pacific lamprey, and pink shrimp, comparing AP burdens across trophic levels and between vessel-retrieved and retail-purchased individuals. Edible tissue was digested and analyzed under a microscope, and a subset of suspected APs was identified using spectroscopy (μFTIR). Anthropogenic particles were found in 180 of 182 individuals. Finfish contained 0.02–1.08 AP/g of muscle tissue. In pink shrimp (Pandalus jordani), the average AP/g was 10.68 for vessel-retrieved and …

Re-Indigenizing And Collaboratively Tending Urban Greenspaces, Divinity Nnenne Adewale

University Honors Theses

This work details the active process of land tending with the intention of re-Indigenization in the Pacific Northwest at several Portland sites; The Native American Student Community Center, PSU Oak Savanna, and the Ridgefield National Wildlife Refuge. Land tending is an intuitive process, one rooted in love and respect for life of all forms as well as becoming the perpetual student; land tending is not a skill to be mastered, only practiced. Unlike environmental management, tending cannot be done separate from the earth, in a classroom or otherwise. Connections are what tending is built on top of: the foundation; effort …

Aquatic Plant Threats To The Columbia River, Jacob Rose, Gabriel Campbell

Center for Lakes and Reservoirs Publications and Presentations

These presentation slides provide an overview of some of the invasive aquatic plants that pose an emerging threat to Oregon waterways. It contains botanical notes and high-quality photographs of approximately nine different plant species. Additional slides emphasize the importance of early detection and rapid response, as well as existing resources for invasive species outreach. This presentation was given orally at the Oregon Department of Agriculture's Interagency Noxious Weed Symposium to an audience of natural resource practitioners.

Emerging Aquatic Plant Threats To Oregon Waterways, Jacob Rose, Gabriel Campbell

Center for Lakes and Reservoirs Publications and Presentations

This brief presentation provides an overview some of two invasive aquatic plants that pose a threat to the Columbia River, where it borders Oregon and Washington. Flowering rush (Butomus umbellatus) and fragrant waterlily (Nymphaea odorata) threaten aquatic habitats up and down the Columbia River. Staff from the Center for Lakes & Reservoirs promoted a quick, picture-based key for flowering rush and lookalikes. This presentation was given orally at the Oregon Department of Agriculture's Interagency Noxious Weed Symposium to an audience of natural resource practitioners.

The Role Of Christianity In Shaping Agrarian Policies And Environmental Interactions: A Comparative Analysis Of The Uk And The Netherlands, Grace N. Brimble

University Honors Theses

This thesis explores the enduring influence of Protestant Christianity on agrarian practices and environmental policies in the UK and the Netherlands, focusing on how historical religious values shape modern ecological and political landscapes. Despite increasing secularism, Protestant ethics--emphasising stewardship, diligence, and moral responsibility--persist culturally, influencing debates on sustainability, rural identity, and land use. Using case studies such as nitrogen policy protests in the Netherlands and post-Brexit agricultural transitions in the UK, this analysis highlights the symbolic role of Christian values in framing resistance and adaptation to contemporary challenges. The research combines discourse analysis and ethnographic perspectives to uncover the interplay …

Oregon State Rank Assessment For Warner Basin Tui Chub (Siphateles Bicolor Ssp. 15), Eleanor P. Gaines, Jesse Laney

Institute for Natural Resources Publications

Oregon state conservation status assessment for Warner Basin tui chub (Siphateles bicolor ssp. 15) using NatureServe methodology, 2024.