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Don Juan Pond, Antarctica: Near-surface CaCl2-brine feeding Earth’s most saline lake and implications for Mars

Creator:: Dickson, James L., Head, James W., Levy, Joseph S., and Marchant, David R.
Abstract:: The discovery on Mars of recurring slope lineae (RSL), thought to represent seasonal brines, has sparked interest in analogous environments on Earth. We report on new studies of Don Juan Pond (DJP), which exists at the upper limit of ephemeral water in the McMurdo Dry Valleys (MDV) of Antarctica, and...
Resource Type:: Article
Full Text:: basin, permit a reassessment of the most likely contributors to the unprecedented salinity of Don Juan

Dissolved organic carbon in interstitial waters from sediments of Middle Valley, leg 139

Creator:: Ran, Baiyun and Simoneit, Bernd R. T.
Abstract:: High-temperature combustion oxidation measurements of nonvolatile dissolved organic carbon (DOC) have been determined for pore waters from sediments of Middle Valley, Ocean Drilling Program Leg 139, as well as for overlying and near-bottom seawater. The DOC values in the interstitial waters are generally greater than those in the overlying water...
Resource Type:: Article
Full Text:: hydrocarbon gases. INTRODUCTION Middle Valley, a northern segment of the Juan de Fuca Ridge, is part of a

⁴⁰Ar-³⁹Ar ages of lavas from the Southeast Greenland margin, ODP leg 152, and the Rockall Plateau, DSDP leg 81

Creator:: Sinton, Christopher W. and Duncan, Robert A.
Abstract:: ⁴⁰Ar-³⁹Ar incremental heating experiments were performed on volcanic rocks recovered by drilling during Ocean Drilling Program Leg 152, southeast Greenland Margin (63°N), and Deep Sea Drilling Project Leg 81, southwest Rockall Plateau (56°N). Both of these legs drilled into thick sections of submerged lava flows, known as seaward-dipping reflector sequences,...
Resource Type:: Article
Full Text:: 811 Christopher W. Sinton2,3 and Robert A. Duncan2 ABSTRACT 40Ar-39Ar incremental heating

Leg 202 synthesis: Southeast Pacific paleoceangraphy

Creator:: Tiedemann, Ralf and Mix, Alan C.
Abstract:: Ocean Drilling Program (ODP) Leg 202 has opened a new window into understanding late Paleogene and Neogene global environmental change by providing high-quality sediment sequences from a previously unsampled region, the eastern South Pacific. Eleven sites (1232– 1242) that record variations on timescales ranging from decades to tens of millions...
Resource Type:: Article
Full Text:: and Alan Mix3 ABSTRACT Ocean Drilling Program (ODP) Leg 202 has opened a new window into

Covariant Derivatives on Null Submanifolds

Creator:: Hickethier, Don and Dray, Tevian
Abstract:: The degenerate nature of the metric on null hypersurfaces makes it difficult to define a covariant derivative on null submanifolds. Recent approaches using decomposition to define a covariant derivative on null hypersurfaces are investigated, with examples demonstrating the limitations of the methods. Motivated by Geroch’s work on asymptotically flat spacetimes,...
Resource Type:: Article
Full Text:: ar X iv :1 10 8. 23 32 v1 [ gr -q c] 1 1 A ug

Factors Influencing Dissolved Copper Concentrations in Oregon Highway Stormwater Runoff

Creator:: Nason, Jeffrey A., Bloomquist, Don J., and Sprick, Matthew S.
Abstract:: Highway stormwater runoff represents a significant source of dissolved copper to surface waters. It is well established that even low concentrations of dissolved copper can be toxic to many aquatic organisms. In the Pacific Northwest of the United States, recent research has focused on the effects of low-level copper exposure...
Resource Type:: Article
Full Text:: in 1 Oregon Highway Stormwater Runoff 2 Jeffrey A. Nason1, Don J. Bloomquist2, and Matthew S

A comparison of techniques for magnetotelluric response function estimation

Creator:: Jones, Alan G., Chave, Alan D., Egbert, Gary D., Auld, Don, and Bahr, Karsten
Abstract:: Spectral analysis of the time-varying horizontal magnetic and electric field components yields the magnetotelluric (MT) impedance tensor. This frequency dependent 2x2 complex tensor can be examined for details which axe diagnostic of the electrical conductivity distribution in the Earth within the relevant (frequency dependent) inductive scale length of the surface...
Resource Type:: Article
Full Text:: A Comparison of Techniques for Magnetotelluric Response

Production possibility frontiers and socioecological tradeoffs for restoration of fire adapted forests

Creator:: Ager, Alan A., Day, Michelle A., and Vogler, Kevin
Abstract:: We used spatial optimization to analyze alternative restoration scenarios and quantify tradeoffs for a large, multifaceted restoration program to restore resiliency to forest landscapes in the western US. We specifically examined tradeoffs between provisional ecosystem services, fire protection, and the amelioration of key ecological stressors. The results revealed that attainment...
Resource Type:: Article
Full Text:: socioecological tradeoffs for restoration of fire adapted forests Alan A. Ager a, *, Michelle A. Day b, Kevin

Prospects for Recovering Endemic Fishes Pursuant to the U.S. Endangered Species Act

Creator:: Williams, Jack E., Macdonald, Catherine A., Williams, Cindy Deacon, Weeks, Hal, Lampman, Georgina, and Sada, Don W.
Abstract:: If the success of the Endangered Species Act (ESA) is measured by the number of endangered species that have been recovered and delisted, then the act is not very successful. Only 15 species have been delisted because of recovery in the history of the ESA. The Borax Lake chub (Gila...
Resource Type:: Article
Full Text:: may war- rant future dellsting. A panel of scientists was convened to determine consensus regarding

Probabilistic assessment of wildfire hazard and municipal watershed exposure

Creator:: Scott, Joe, Helmbrecht, Don, Thompson, Matthew P., Calkin, David E., and Marcille, Kate
Abstract:: The occurrence of wildfires within municipal watersheds can result in significant impacts to water quality and ultimately human health and safety. In this paper, we illustrate the application of geospatial analysis and burn probability modeling to assess the exposure of municipal watersheds to wildfire. Our assessment of wildfire exposure consists...
Resource Type:: Article
Full Text:: wildfire hazard and municipal watershed exposure Joe Scott • Don Helmbrecht • Matthew P. Thompson • David

ScholarsArchive@OSU

Don Juan Pond, Antarctica: Near-surface CaCl2-brine feeding Earth’s most saline lake and implications for Mars

Dissolved organic carbon in interstitial waters from sediments of Middle Valley, leg 139

⁴⁰Ar-³⁹Ar ages of lavas from the Southeast Greenland margin, ODP leg 152, and the Rockall Plateau, DSDP leg 81

Leg 202 synthesis: Southeast Pacific paleoceangraphy

Covariant Derivatives on Null Submanifolds

Factors Influencing Dissolved Copper Concentrations in Oregon Highway Stormwater Runoff

A comparison of techniques for magnetotelluric response function estimation

Production possibility frontiers and socioecological tradeoffs for restoration of fire adapted forests

Prospects for Recovering Endemic Fishes Pursuant to the U.S. Endangered Species Act

Probabilistic assessment of wildfire hazard and municipal watershed exposure

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