Digital Commons Network^™

Coupled Atmosphere–Biophysics–Hydrology Models For Environmental Modeling, Robert L. Walko, Larry E. Band, Jill Baron, Timothy G. F. Kittel, Richard B. Lammers, Tsengdar J. Lee, Dennis S. Ojima, Roger A. Pielke Sr., Chris Taylor, Christina L. Tague, Craig J. Tremback, Pier Luigi Vidale

Faculty Publications

The formulation and implementation of LEAF-2, the Land Ecosystem–Atmosphere Feedback model, which comprises the representation of land–surface processes in the Regional Atmospheric Modeling System (RAMS), is described. LEAF-2 is a prognostic model for the temperature and water content of soil, snow cover, vegetation, and canopy air, and includes turbulent and radiative exchanges between these components and with the atmosphere. Subdivision of a RAMS surface grid cell into multiple areas of distinct land-use types is allowed, with each subgrid area, or patch, containing its own LEAF-2 model, and each patch interacts with the overlying atmospheric column with a weight proportional to …

Researchers Explore Arctic Freshwater's Role In Ocean Circulation, Steven L. Forman, Wieslaw Maslowski, John T. Andrews, David Lubinski, Michael Steele, Jain Zhang, Richard B. Lammers, Bruce Peterson

Faculty Publications

A critical, but insufficiently understood, component of global change is the influence of Arctic freshwater input on water mass exchange between the Arctic Ocean and Atlantic and Pacific Oceans. Four of the Earth's 10 largest river systems, the Mackenzie, Ob,Yenisei, and Lena, contribute water to the Arctic shore (Figure 1) from a vast watershed that drains continental interiors. This river discharge flows into the world's largest contiguous continental shelf and supplies over 50% (1823 km3 ) of the riverine input to the Arctic Ocean.

Sea Level Pressure Variability In The Amundsen Sea Region Inferred From A West Antarctic Glaciochemical Record, Karl J. Kreutz, Paul A. Mayewski, Iqbal I. Pittalwala, L. David Meeker, Mark S. Twickler, Sallie I. Whitlow

Faculty Publications

Using European Center for Medium‐Range Weather Forecasts (ECMWF) numerical operational analyses, sea ice extent records, and station pressure data, we investigate the influence of sea level pressure variability in the Amundsen Sea region on a West Antarctic (Siple Dome) glaciochemical record. Empirical orthogonal function analysis of the high‐resolution Siple Dome multivariate ice core chemical time series record (SDEOF1) documents lower tropospheric transport of sea‐salt aerosols to the site. During 1985–1994 the SDEOF1 record of high (low) aerosol transport corresponds to anomalously low (high) sea level pressure (SLP) in the Amundsen Sea region. Spatial correlation patterns between ECMWF monthly SLP fields …

Alcohol, Tobacco, And Pharmaceutical Industry Funding: Considerations For Organizations Serving Lesbian, Gay, Bisexual And Transgender Communities, Laurie A. Drabble

Faculty Publications

Emerging research suggests that alcohol, tobacco and drug-related problems may be higher in lesbian and gay communities than in the population as a whole. At the same time, alcohol, tobacco and pharmaceutical industries have increased marketing strategies that are targeted specifically to lesbian and gay communities. Lesbian, Gay, Bisexual and Transgender (LGBT) and HTV/AIDS organizations, often marginalized and under-funded, have frequently faced significant challenges in funding programs and special events. These organizations are often the very same groups needed to promote and support effective substance abuse countermeasures in LGBT communities. Agency leaders, community members, and substance abuse prevention advocates all …

The Power Of Codification In Latin America: Simón Bolívar And The Code Napoléon, M C. Mirow

Faculty Publications

Codification can be an effective means to centralize and to consolidate state power. The use of codification in this manner runs against the commonly perceived notion that it promotes republican and egalitarian values. As Simon Bolivar's dictatorship quickly crumbled around him, he turned to codification based on the Code Napoleon as part of an attempt to unify Gran Colombia. Factors leading him to this undertaking and source were the need for legal reform, his emulation of Napoleon, his exposure to the works of Jeremy Bentham, and, speculatively, the influence of Andres Bello. Boivar's attempt at codification was not to complete …

Life In A Pine Cone, David L. Kulhavy

Faculty Publications

This exercise focuses on a little-known microhabitat -- the pine cone. A pine cone's primary function is, of course, reproduction ... housing the seeds of the next generation of conifer trees. However, pine cones are also the basis of a food web that provides both resources and living space for a wide variety of small arthropod species. The procedure outlined below is designed to examine this microhabitat and compare its community diversity among different species of conifers and habitats.

The exercise is based on a 1985 paper, Life in a Pine Cone, by David L. Kulhavy, Robert S. Baldridge and …

Positive Selection And Propeptide Repeats Promote Rapid Interspecific Divergence Of A Gastropod Sperm Protein, Michael E. Hellberg, Gary W. Moy, Victor D. Vacquier

Faculty Publications

Male-specific proteins have increasingly been reported as targets of positive selection and are of special interest because of the role they may play in the evolution of reproductive isolation. We report the rapid interspecific divergence of cDNA encoding a major acrosomal protein of unknown function (TMAP) of sperm from five species of teguline gastropods. A mitochondrial DNA clock (calibrated by congeneric species divided by the Isthmus of Panama) estimates that these five species diverged 2-10 MYA. Inferred amino acid sequences reveal a propeptide that has diverged rapidly between species. The mature protein has diverged faster still due to high nonsynonymous …

Linking Biodiversity Above And Below The Marine Sediment-Water Interface, P. V.R. Snelgrove, M. C. Austen, G. Boucher, C. Heip, P. A. Hutchings, G. M. King, I. Koike, P. J.D. Lambshead, C. R. Smith

Faculty Publications

No abstract provided.

Sensitivity Of A High‐Elevation Rocky Mountain Watershed To Altered Climate And Co2, Jill S. Baron, Melannie D. Hartman, L. E. Band, Richard B. Lammers

Faculty Publications

We explored the hydrologic and ecological responses of a headwater mountain catchment, Loch Vale watershed, to climate change and doubling of atmospheric CO2 scenarios using the Regional Hydro‐Ecological Simulation System (RHESSys). A slight (2°C) cooling, comparable to conditions observed over the past 40 years, led to greater snowpack and slightly less runoff, evaporation, transpiration, and plant productivity. An increase of 2°C yielded the opposite response, but model output for an increase of 4°C showed dramatic changes in timing of hydrologic responses. The snowpack was reduced by 50%, and runoff and soil water increased and occurred 4–5 weeks earlier with 4°C …

Geographic Alliance Of Iowa. Lesson Plans, Kay E. Weller, Nancy Howe-Ford

Faculty Publications

This collection of five lesson plans in geography can be adapted for use with K-12 students. Each lesson plan explains the lesson and provides basic instructions. The lesson plans are titled: "Teaching Geography Using Literature in K-University Classrooms" (Kay Weller); "Geography and a Mystery Novel" (Kay Weller); "Understanding Latitude and Longitude" (Kay Weller); "Mississippi River Cruise" (Kay Weller); and "Create a Magazine Project" (Nancy Howe-Ford). (BT)

Two Degrees Of Speech Protection: Free Speech Through The Prism Of Agricultural Disparagement Laws, Howard M. Wasserman

Faculty Publications

In the wake of a 1989 national television broadcast reporting the alleged cancer risk of a chemical applied to apples on trees, many states passed agricultural product disparagement (APD) statutes. These statutes grant civil causes of action to the growers and sellers of perishable food products, against anyone who speaks negatively or disparagingly, without basis in scientific evidence, about the product's safety. In this Article, Howard M Wasserman explores the interplay between the APD statutes and the First Amendment. First, Mr. Wasserman discusses the three categories of restrictions on the freedom of speech, focusing primarily on private civil tort actions …

The Bible: Revelation And Authority, Richard M. Davidson

Faculty Publications

No abstract provided.

A Biblical Theology Of The Flood, Richard M. Davidson

Faculty Publications

No abstract provided.

Characterization Of Hypoxia: Topic 1 Report For The Integrated Assessment On Hypoxia In The Gulf Of Mexico, Nancy N. Rabalais, R. Eugene Turner, Dubravko Justic, Quay Dortch, William J. Wiseman

Faculty Publications

No abstract provided.

Simulations Of Snow Distribution And Hydrology In A Mountain Basin, Melannie D. Hartman, Jill S. Baron, Richard B. Lammers, Donald W. Cline, Larry E. Band, Glen E. Liston, Christina L. Tague

Faculty Publications

We applied a version of the Regional Hydro‐Ecologic Simulation System (RHESSys) that implements snow redistribution, elevation partitioning, and wind‐driven sublimation to Loch Vale Watershed (LVWS), an alpine‐subalpine Rocky Mountain catchment where snow accumulation and ablation dominate the hydrologic cycle. We compared simulated discharge to measured discharge and the simulated snow distribution to photogrammetrically rectified aerial (remotely sensed) images. Snow redistribution was governed by a topographic similarity index. We subdivided each hillslope into elevation bands that had homogeneous climate extrapolated from observed climate. We created a distributed wind speed field that was used in conjunction with daily measured wind speeds to …

Erratum: Lizards Took Express Train To Polynesia (Nature (1999) 397 (13- 114), C. Austin

Faculty Publications

No abstract provided.

Top Management International Orientation And Small Business Exporting Performance: The Moderating Roles Of Export Market & Industry Factors, Franz T. Lohrke, Geralyn Mcclure Franklin, Vinay Kothari

Faculty Publications

This study examined the relationship between top management team international orientation and small business export performance. Results generally supported the hypotheses that market and industry factors moderate this relationship. Employing a sample of U.S. small business exporters, the study found that top management team international orientation had a greater positive relationship with export performance for firms exporting to countries culturally different and geographically distant from their home country than those exporting to countries culturally similar and geographically proximate to their home countries. In addition, international orientation had a greater positive relationship with export performance for firms competing in multidomestic industries …

A Good Home For A Poor Man: Fort Polk And Vernon Parish, 1800-1940, Steven D. Smith

Faculty Publications

No abstract provided.

The Making Of The Myth In Postcolonial Development: Material-Conceptual Landscape Transformation In Sixteenth-Century Veracruz, Andrew Sluyter

Faculty Publications

No abstract provided.

Rapid Evolution Of Fertilization Selectivity And Lysin Cdna Sequences In Teguline Gastropods, Michael E. Hellberg, Victor D. Vacquier

Faculty Publications

Proteins mediating intercellular recognition face opposing selective forces as they evolve: purifying selection to maintain function, and diversifying selection to alter specificity. Lysin is a 16-kDa protein which enables sperm of free-spawning marine snails to make a hole in the vitelline layer (VE) surrounding conspecific eggs. Previous work on abalone (Haliotis spp.) has shown that positive selection promotes rapid interspecific divergence of lysin. Here, we present data on the specificity of VE dissolution by four species of teguline gastropods, along with lysin cDNA sequences. The teguline and abalone lineages diverged over 250 MYA. As in abalone, VE dissolution by lysin …

Studying The Importance Of Hurricanes To The Northern Gulf Of Mexico Coast, Gregory W. Stone, Ping Wang, David A. Pepper, John M. Grymes, Harry H. Roberts, Xiongping Zhang, S. A. Hsu, Oscar K. Huh

Faculty Publications

No abstract provided.

A Second Redemption?, Bradley W. Joondeph

Faculty Publications

No abstract provided.

Making The "White Man's Country" White: Race, Slavery, And State-Building In The Jacksonian South, Lacy K. Ford, Jr.

Faculty Publications

No abstract provided.

Review Of Sacred Ecology: Traditional Ecological Knowledge And Resource Management, By Fikret Berkes, Andrew Sluyter

Faculty Publications

No abstract provided.

Physical Controls On The Taylor Valley Ecosystem, Antarctica, Andrew G. Fountain, W. Berry Lyons, Melody B. Burkins, Gayle L. Dana, Peter T. Doran, Karen J. Lewis, Diane M. Mcknight, Daryl L. Moorhead, Andrew N. Parsons, John C. Priscu, Diana H. Wall, Robert A. Wharton, Ross A. Virginia

Faculty Publications

No abstract provided.

Dam Nation: A Geographic Census Of American Dams And Their Large-Scale Hydrologic Impacts, William L. Graf

Faculty Publications

Newly available data indicate that darns fragment the fluvial system of the continental United States and that their impact on river discharge is several times greater than impacts deemed likely as a result of global climate change. The 75,000 dams in the continental United States are capable of storing a volume of water almost equaling one year's mean runoff, but there is considerable geographic variation in potential surface water impacts. In some western mountain and plains regions, darns can store more than 3 year's runoff, while in the Northeast and Northwest, storage is as little as 25% of the annual …

Historical Essays On Meteorology, 1919-1995, Theodore S. Feldman

Faculty Publications

No abstract provided.

Congress, The Internet, And The Intractable Pornography Problem: The Child Online Protection Act Of 1998, Timothy Zick

Faculty Publications

No abstract provided.

Two Cheers For The Commission On Structural Alternatives For The Federal Courts Of Appeals, Thomas E. Baker

Faculty Publications

No abstract provided.

Seasonal Patterns And Controls On Net Ecosystem Co2 Exchange In A Boreal Peatland Complex, Jill L. Bubier, Patrick M. Crill, Tim R. Moore, Kathleen Savage, Ruth K. Varner

Faculty Publications

We measured seasonal patterns of net ecosystem exchange (NEE) of CO2 in a diverse peatland complex underlain by discontinuous permafrost in northern Manitoba, Canada, as part of the Boreal Ecosystems Atmosphere Study (BOREAS). Study sites spanned the full range of peatland trophic and moisture gradients found in boreal environments from bog (pH 3.9) to rich fen (pH 7.2). During midseason (July‐August, 1996), highest rates of NEE and respiration followed the trophic sequence of bog (5.4 to −3.9 μmol CO2 m−2 s−1) < poor fen (6.3 to −6.5 μmol CO2 m−2 s−1) < intermediate fen (10.5 to −7.8 μmol CO2 m−2 s−1) < rich fen (14.9 to −8.7 μmol CO2m−2 s−1). The sequence changed during spring (May‐June) and fall (September‐October) when ericaceous shrub (e.g., Chamaedaphne calyculata) bogs and sedge (Carex spp.) communities in poor to intermediate fens had higher maximum CO2 fixation rates than deciduous shrub‐dominated (Salix spp. and Betula spp.) rich fens. Timing of snowmelt and differential rates of peat surface thaw in microtopographic hummocks and hollows controlled the onset of carbon uptake in spring. Maximum photosynthesis and respiration were closely correlated throughout the growing season with a ratio of approximately 1/3 ecosystem respiration to maximum carbon uptake at all sites across the trophic gradient. Soil temperatures above the water table and timing of surface thaw and freeze‐up in the spring and fall were more important to net CO2 exchange than deep soil warming. This close coupling of maximum CO2 uptake and respiration to easily measurable variables, such as trophic status, peat temperature, and water table, will improve models of wetland carbon exchange. Although trophic status, aboveground net primary productivity, and surface temperatures were more important than water level in predicting respiration on a daily basis, the mean position of the water table was a good predictor (r2 = 0.63) of mean respiration rates across the range of plant community and moisture gradients. Q10 values ranged from 3.0 to 4.1 from bog to rich fen, but when normalized by above ground vascular plant biomass, the Q10 for all sites was 3.3.