Exchange of groundwater and surface-water mediated by permafrost response to seasonal and long term air temperature variation
S. Ge, J. McKenzie, C. Voss, Q. Wu
2011, Geophysical Research Letters (38)
Permafrost dynamics impact hydrologic cycle processes by promoting or impeding groundwater and surface water exchange. Under seasonal and decadal air temperature variations, permafrost temperature changes control the exchanges between groundwater and surface water. A coupled heat transport and groundwater flow model, SUTRA, was modified to simulate groundwater flow and heat...
The importance of within-year repeated counts and the influence of scale on long-term monitoring of sage-grouse
B.C. Fedy, Cameron L. Aldridge
2011, Journal of Wildlife Management (75) 1022-1033
Long‐term population monitoring is the cornerstone of animal conservation and management. The accuracy and precision of models developed using monitoring data can be influenced by the protocols guiding data collection. The greater sage‐grouse (Centrocercus urophasianus) is a species of concern that has been monitored over decades, primarily, by counting the...
Statistical methods of estimating mining costs
K. R. Long
2011, Conference Paper, SME Annual Meeting and Exhibit and CMA 113th National Western Mining Conference 2011
Until it was defunded in 1995, the U.S. Bureau of Mines maintained a Cost Estimating System (CES) for prefeasibility-type economic evaluations of mineral deposits and estimating costs at producing and non-producing mines. This system had a significant role in mineral resource assessments to estimate costs of developing and operating known...
Labile Fe(II) concentrations in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre
G. Sarthou, E. Bucciarelli, F. Chever, S.P. Hansard, M. Gonzalez-Davila, J. M. Santana-Casiano, F. Planchon, S. Speich
2011, Biogeosciences (8) 2461-2479
Labile Fe(II) distributions were investigated in the Sub-Tropical South Atlantic and the Southern Ocean during the BONUS-GoodHope cruise from 34 to 57° S (February–March 2008). Concentrations ranged from below the detection limit (0.009 nM) to values as high as 0.125 nM. In the surface mixed layer, labile Fe(II) concentrations were...
Wave climate and trends along the eastern Chukchi Arctic Alaska coast
L. H. Erikson, C. D. Storlazzi, R. E. Jensen
2011, Conference Paper, Solutions to Coastal Disasters 2011 - Proceedings of the 2011 Solutions to Coastal Disasters Conference
Due in large part to the difficulty of obtaining measurements in the Arctic, little is known about the wave climate along the coast of Arctic Alaska. In this study, numerical model simulations encompassing 40 years of wave hind-casts were used to assess mean and extreme wave conditions. Results indicate that...
A bayesian approach for determining velocity and uncertainty estimates from seismic cone penetrometer testing or vertical seismic profiling data
Adam Pidlisecky, Seth S. Haines
2011, Canadian Geotechnical Journal (48) 1061-1069
Conventional processing methods for seismic cone penetrometer data present several shortcomings, most notably the absence of a robust velocity model uncertainty estimate. We propose a new seismic cone penetrometer testing (SCPT) data-processing approach that employs Bayesian methods to map measured data errors into quantitative estimates of model uncertainty. We first...
The influence of the Atlantic Warm Pool on the Florida panhandle sea breeze
V. Misra, L. Moeller, L. Stefanova, S. Chan, J. J. O’Brien, T.J. Smith, N. Plant
2011, Journal of Geophysical Research D: Atmospheres (116)
In this paper we examine the variations of the boreal summer season sea breeze circulation along the Florida panhandle coast from relatively high resolution (10 km) regional climate model integrations. The 23 year climatology (1979-2001) of the multidecadal dynamically downscaled simulations forced by the National Centers for Environmental Prediction-Department of...
Seasonal dripwater Mg/Ca and Sr/Ca variations driven by cave ventilation: Implications for and modeling of speleothem paleoclimate records
C.I. Wong, J.L. Banner, MaryLynn Musgrove
2011, Geochimica et Cosmochimica Acta (75) 3514-3529
A 4-year study in a central Texas cave quantifies multiple mechanisms that control dripwater composition and how these mechanisms vary at different drip sites. We monitored cave-air compositions, in situ calcite growth, dripwater composition and drip rate every 4–6 weeks. Three groups of drip sites are delineated (Groups 1–3) based on...
Modeling sulfate reduction in methane hydrate-bearing continental margin sediments: Does a sulfate-methane transition require anaerobic oxidation of methane?
A. Malinverno, John W. Pohlman
2011, Geochemistry, Geophysics, Geosystems (12)
The sulfate‐methane transition (SMT), a biogeochemical zone where sulfate and methane are metabolized, is commonly observed at shallow depths (1–30 mbsf) in methane‐bearing marine sediments. Two processes consume sulfate at and above the SMT, anaerobic oxidation of methane (AOM) and organoclastic sulfate reduction (OSR). Differentiating the relative contribution of each...
Status and distribution of the Kittlitz's murrelet Brachyramphus brevirostris in Kenai Fjords, Alaska
Mayumi L. Arimitsu, John F. Piatt, Marc D. Romano, Thomas I. van Pelt
2011, Marine Ornithology: Journal of Seabird Research and Conservation (39) 13-22
The Kittlitz's Murrelet Brachyramphus brevirostris is a candidate species for listing under the US Endangered Species Act because of its apparent declines within core population areas of coastal Alaska. During the summers of 2006-2008, we conducted surveys in marine waters adjacent to Kenai Fjords National Park, Alaska, to estimate the...
The stratigraphic filter and bias in measurement of geologic rates
R. Schumer, D. Jerolmack, Brandon McElroy
2011, Geophysical Research Letters (38)
Erosion and deposition rates estimated from the stratigraphic record frequently exhibit a power‐law dependence on measurement interval. This dependence can result from a power‐law distribution of stratigraphic hiatuses. By representing the stratigraphic filter as a stochastic process called a reverse ascending ladder, we describe a likely origin of power‐law hiatuses,...
Host and viral ecology determine bat rabies seasonality and maintenance
D.B. George, C.T. Webb, Matthew L. Farnsworth, T. J. O'Shea, R. A. Bowen, D.L. Smith, T.R. Stanley, L.E. Ellison, C. E. Rupprecht
2011, Proceedings of the National Academy of Sciences of the United States of America (108) 10208-10213
Rabies is an acute viral infection that is typically fatal. Most rabies modeling has focused on disease dynamics and control within terrestrial mammals (e.g., raccoons and foxes). As such, rabies in bats has been largely neglected until recently. Because bats have been implicated as natural reservoirs for several emerging zoonotic...
Geology and petroleum potential of the Arctic Alaska petroleum province
Kenneth J. Bird, David W. Houseknecht
2011, Geological Society Memoir 485-499
The Arctic Alaska petroleum province encompasses all lands and adjacent continental shelf areas north of the Brooks Range–Herald Arch orogenic belt and south of the northern (outboard) margin of the Beaufort Rift shoulder. Even though only a small part is thoroughly explored, it is one of the most prolific petroleum...
Satellite and ground observations of the June 2009 eruption of Sarychev Peak volcano, Matua Island, Central Kuriles
A. Rybin, M. Chibisova, P. Webley, T. Steensen, P. Izbekov, Christina A. Neal, V. Realmuto
2011, Bulletin of Volcanology (73) 1377-1392
After 33 years of repose, one of the most active volcanoes of the Kurile island arc—Sarychev Peak on Matua Island in the Central Kuriles—erupted violently on June 11, 2009. The eruption lasted 9 days and stands among the largest of recent historical eruptions in the Kurile Island chain. Satellite monitoring of the...
Are secular correlations between sunspots, geomagnetic activity, and global temperature significant?
Jeffrey J. Love, K. Mursula, V.C. Tsai, D. M. Perkins
2011, Geophysical Research Letters (38)
Recent studies have led to speculation that solar‐terrestrial interaction, measured by sunspot number and geomagnetic activity, has played an important role in global temperature change over the past century or so. We treat this possibility as an hypothesis for testing. We examine the statistical significance of cross‐correlations between sunspot number,...
Measuring currents in submarine canyons: technological and scientific progress in the past 30 years
J. P. Xu
2011, Geosphere (7) 868-876
The development and application of acoustic and optical technologies and of accurate positioning systems in the past 30 years have opened new frontiers in the submarine canyon research communities. This paper reviews several key advancements in both technology and science in the field of currents in submarine canyons since the1979...
Fish entrainment rates through towboat propellers in the Upper Mississippi and Illinois rivers
Killgore K. Jack, Leandro E. Miranda, C.E. Murphy, D.M. Wolff, J.J. Hoover, T.M. Keevin, S.T. Maynord, M.A. Cornish
2011, Transactions of the American Fisheries Society (140) 570-581
A specially designed net was used to study fish entrainment and injury through towboat propellers in 13 pools of the Upper Mississippi and Illinois rivers. The net was attached to the stern of a 48.8‐m‐long towboat with twin propellers (in Kort propulsion nozzles), and sampling typically took place while the...
The dynamics, transmission, and population impacts of avian malaria in native hawaiian birds: A modeling approach
Michael D. Samuel, P.H.F. Hobbelen, F. Decastro, Jorge A. Ahumada, Dennis Lapointe, Carter T. Atkinson, Bethany L. Woodworth, P.J. Hart, D.C. Duffy
2011, Ecological Applications (21) 2960-2973
We developed an epidemiological model of avian malaria (Plasmodium relictum) across an altitudinal gradient on the island of Hawaii that includes the dynamics of the host, vector, and parasite. This introduced mosquito‐borne disease is hypothesized to have contributed to extinctions and major shifts in the altitudinal distribution of highly susceptible...
When a habitat freezes solid: Microorganisms over-winter within the ice column of a coastal Antarctic lake
C.M. Foreman, M. Dieser, M. Greenwood, R.M. Cory, J. Laybourn-Parry, John T. Lisle, C. Jaros, P.L. Miller, Y.-P. Chin, Diane M. McKnight
2011, FEMS Microbiology Ecology (76) 401-412
A major impediment to understanding the biology of microorganisms inhabiting Antarctic environments is the logistical constraint of conducting field work primarily during the summer season. However, organisms that persist throughout the year encounter severe environmental changes between seasons. In an attempt to bridge this gap, we collected ice core samples...
A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean
Thomas E. Moore, Arthur Grantz, Janet K. Pitman, Philip J. Brown
2011, Geological Society Memoir (35) 751-769
The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the...
Regional magnetic domains of the Circum-Arctic: A framework for geodynamic interpretation
R. W. Saltus, E. L. Miller, C. Gaina, P. J. Brown
2011, Geological Society Memoir (35) 49-60
We identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and...
Evaluation of TRIGRS (transient rainfall infiltration and grid-based regional slope-stability analysis)'s predictive skill for hurricane-triggered landslides: A case study in Macon County, North Carolina
Z. Liao, Y. Hong, D. Kirschbaum, R.F. Adler, J.J. Gourley, R. Wooten
2011, Natural Hazards (58) 325-339
The key to advancing the predictability of rainfall-triggered landslides is to use physically based slope-stability models that simulate the transient dynamical response of the subsurface moisture to spatiotemporal variability of rainfall in complex terrains. TRIGRS (transient rainfall infiltration and grid-based regional slope-stability analysis) is a USGS landslide prediction model, coded...
Cassini SAR, radiometry, scatterometry and altimetry observations of Titan's dune fields
Gall A. Le, M.A. Janssen, L. C. Wye, A. G. Hayes, J. Radebaugh, C. Savage, H. Zebker, R. D. Lorenz, J. I. Lunine, Randolph L. Kirk, R. M. C. Lopes, S. Wall, P. Callahan, E. R. Stofan, Tom Farr
2011, Icarus (213) 608-624
Large expanses of linear dunes cover Titan’s equatorial regions. As the Cassini mission continues, more dune fields are becoming unveiled and examined by the microwave radar in all its modes of operation (SAR, radiometry, scatterometry, altimetry) and with an increasing variety of observational geometries. In this paper, we report on...
Evidence of two genetic clusters of manatees with low genetic diversity in Mexico and implications for their conservation
C. Nourisson, B. Morales-Vela, J. Padilla-Saldivar, K.P. Tucker, A. Clark, L. D. Olivera-Gomez, Robert K. Bonde, P. McGuire
2011, Genetica (139) 833-842
The Antillean manatee (Trichechus manatus manatus) occupies the tropical coastal waters of the Greater Antilles and Caribbean, extending from Mexico along Central and South America to Brazil. Historically, manatees were abundant in Mexico, but hunting during the pre-Columbian period, the Spanish colonization and throughout the history of Mexico, has resulted...
Predator-induced demographic shifts in coral reef fish assemblages
B.I. Ruttenberg, S.L. Hamilton, S.M. Walsh, Mary Donovan, Alan M. Friedlander, E. DeMartini, E. Sala, S.A. Sandin
2011, PLoS ONE (6)
In recent years, it has become apparent that human impacts have altered community structure in coastal and marine ecosystems worldwide. Of these, fishing is one of the most pervasive, and a growing body of work suggests that fishing can have strong effects on the ecology of target species, especially top...
