Miracle-dz/UniFAR-FTUs huggingface dataset:
An analysis of the stability and transport of CO2 on Mars and Iapetus: Increasing accuracy via experiments and photometry

Volatile transport of carbon dioxide is most relevant on two planetary bodies in our solar system: Mars and Iapetus. We experimentally measured the sublimation rate of CO2 ice under simulated martian conditions and developed a model based on our experimental results. We experimentally verified that solar irradiance is the primary control for the sublimation of CO2 ice on the martian poles with the amount of radiation striking the surface being controlled by variations in the optical depth, ensuring the formation and sublimation of the seasonal cap. Our model, supported by comparison of MGS-MOC and MRO-HiRISE images, shows that ~ 0.4 m is currently being lost from the south perennial cap per martian year. In order to build a similar model for Iapetus, one key parameter was needed: the bolometric Bond albedo. We used photometry of Cassini VIMS observations of Iapetus to produce the first phase integrals calculated directly from solar phase curves of Iapetus for the leading hemisphere and to estimate the phase integrals for the trailing hemisphere. Our phase integrals, which are lower than previous results, have profound implications for the analyses of the energy balance and volatile transport on this icy satellite. We also utilized Cassini VIMS and ISS and Voyager ISS observations of Iapetus to produce the first bolometric Bond albedo map of Iapetus; the average albedo values for the leading and trailing hemispheres are 0.25 ± 0.03 and 0.05 ± 0.01 respectively. On Iapetus, which has no detectable atmosphere, any carbon dioxide sublimating from the dark material, where it was discovered by reflectance spectroscopy, would either escape the body or migrate on ballistic trajectories to a possible polar cold trap. However, through proof by contradiction, we show that if dry ice is the source of the detected signal in the dark material, it produces an impossible scenario where an extensive polar cap is produced along with incorrect temperatures for the dark material at equatorial latitudes. After ruling out surface dry ice as the source, we set upper limits on the amount of CO2 transport that can occur on Iapetus without forming a polar cap. This dissertation is approved for Recommendation to the Graduate Council Dissertation Director: ______________________________________ Dr. Larry Roe Dissertation Committee: ______________________________________ Dr. Richard Ulrich ______________________________________ Dr. John Dixon ______________________________________ Dr. Jason Tullis ______________________________________ Dr. Julia Kennefick ______________________________________ Dr. Bonnie J. Buratti (ex officio) DISSERTATION DUPLICATION RELEASE I hereby authorize the University of Arkansas Libraries to duplicate this dissertation when needed for research and/or scholarship. Agreed ______________________________________ David Garrison Blackburn Refused ______________________________________ David Garrison Blackburn
Multi‐temporal Mapping of Burned Forest over Canada Using Satellite‐based Change Metrics

Abstract A procedure for continental‐scale mapping of burned boreal forest at 10‐day intervals was developed for application to coarse resolution satellite imagery. The basis of the technique is a multiple logistic regression model parameterized using 1998 SPOT‐4 VEGETATION clear‐sky composites and training sites selected across Canada. Predictor features consisted of multi‐temporal change metrics based on reflectance and two vegetation indices, which were normalized to the trajectory of background vegetation to account for phenological variation. Spatial‐contextual tests applied to the logistic model output were developed to remove noise and increase the sensitivity of detection. The procedure was applied over Canada for the 1998‐2000 fire seasons and validated using fire surveys and burned area statistics from forest fire management agencies. The area of falsely mapped burns was found to be small (3.5% commission error over Canada), and most burns larger than 10 km2 were accurately detected and mapped (R2 = 0.90, P<0.005, n = 91 for burns in two provinces). Canada‐wide satellite burned area was similar, but consistently smaller by comparison to statistics compiled by the Canadian Interagency Forest Fire Centre (by 17% in 1998, 16% in 1999, and 3% in 2000).
Models of inclination shallowing during sediment compaction

We construct microscopic models of compacting sediment which lead to inclination shallowing of the magnetic remanence. The models can be classified as (1) rotation of elongated magnetic grains to more horizontal orientations; (2) rotation toward the horizontal of flat nonmagnetic fabric grains to which smaller magnetic grains are attached; (3) randomization of the sediment by grain rotations which lead to decreased intensity of magnetization and possibly also to inclination shallowing; and (4) finally, we show that the initial within-sample dispersion of the magnetic moments dampens the amount of inclination shallowing of all the models and transforms any form of microscopic mechanism to an equation of a standardized form. The physically realistic models give rise to different magnitudes of inclination shallowing, which to the first order obey an equation of the form tan (I - ΔI) = (1 - a ΔV) tanI, where I is the inclination of the ambient field, ΔI is the inclination shallowing and ΔV the compaction. For these models we also calculate the effect of compaction on the intensity of magnetization, and the results show that considerable randomization is needed to offset the increased intensity due to higher concentrations of magnetic particles caused by compaction. If random rotations of the grains are biased toward rolling about horizontal axes and the randomization is sufficient to cancel the effect of greater concentrations, then the random grain rolling due to the compaction would give rise to considerable inclination shallowing.
Allophane in New Zealand - a review

Studies of allophanes from New Zealand are reviewed, and a definition of the allophane group of minerals is suggested. Three types of allophane are identified, and their structures are discussed under headings Al-rich soil allophanes, Si-rich soil allophanes and stream deposit allophanes. Examples from New Zealand soils and tephras are discussed in relation to properties, identification and weathering processes.
Zooarchaeology and Chronology of Homol'ovi I and Other Pueblo IV Period Sites in the Central Little Colorado River Valley, Northern Arizona

This study explores aspects of the development and organization of a mid-thirteenth through fourteenth-century, ancestral Hopi settlement cluster at Homol'ovi, located in the central Little Colorado River valley in north-central Arizona. The Homol'ovi cluster has been the subject of an intensive, 20-plus year program of excavation and survey by the Arizona State Museum's Homol'ovi Research Program. Homol'ovi I, an 1100-room pueblo occupied from approximately A.D. 1290 to 1400, was excavated between 1994 and 1999 and yielded deeply stratified, intact cultural deposits. The present study develops an internal, ceramic-based chronology of deposits at Homol'ovi I; establishes temporal relationships between occupational components at Homol'ovi I and other Pueblo IV period sites in the Homol'ovi cluster; and explores spatial and temporal variation in ritual activities within the Homol'ovi cluster through the lens of zooarchaeology. The Homol'ovi I chronology developed in this study is based on frequency seriation of imported Jeddito Yellow Ware pottery; stylistic, formal, and technological analysis of Jeddito Yellow Ware; ceramic cross-dating; and high-precision AMS radiocarbon dating. These dating techniques make it possible to seriate cultural deposits at Homol'ovi I, and to tie deposits from other local sites into the Homol'ovi I sequence. Additionally, some of the techniques potentially can be applied to date sites in other regions where Jeddito Yellow Ware pottery is found. This chronological research establishes a framework for tracking behavioral and organizational changes within the village of Homol'ovi I, and for situating events and processes in the life history of this community within a broader, regional context. One potential application of this chronological framework is explored through a zooarchaeological study that addresses temporal and site-to-site variation in the use and deposition of ritually sensitive categories of fauna at Homol'ovi I and other nearby villages, including Homol'ovi II, III, and IV. The fauna of interest include birds, carnivores, artiodactyls, and certain reptiles and amphibians. This study identifies a number of temporal trends that may be related to a major, late-fourteenth century reorganization of the Homol'ovi cluster and its external relations. In doing so, it lays a foundation for further research into the ritual organization of the Homol'ovi cluster.
Morphology, evolution and stratigraphic distribution in the Middle Ordovician conodont genus Microzarkodina

ABSTRACT Microzarkodina is a genus of mainly Middle Ordovician conodonts that has its centre of distribution in Baltoscandia, and much less commonly occurs in southern China, Australia, Argentina and Laurentia. In Baltica a series of species, Microzarkodina russica n. sp. , M. flabellum, M. parva, M. bella, M. hagetiana and M. ozarkodella, established themselves successfully. The succession of species ranges from just below the base of the Middle Ordovician (M. russica) to the upper part of the Middle Ordovician (M. ozarkodella). The species are frequently used for biostratigraphical purposes. The largely contemporaneous species Microzarkodina bella and M. hagetiana probably both evolved from M. parva and mostly occurred in separate areas. Microzarkodina ozarkodella probably evolved from M. hagetiana. This present investigation is based on a total of 94,208 elements, collected from 20 sections and one drill-core site in Sweden, one drill-core site and one outcrop in Estonia and two sections in the St Petersburg area in Russia. The Microzarkodina apparatus probably consisted of 15 or 17 elements: four P, two or four M and nine S elements. The S elements include different Sa, Sb1, Sb2, and Sc element types.
Late Quaternary sequence stratigraphy of the Mackenzie Delta

The Late Wisconsinan and Holocene sequence stratigraphy of the Mackenzie Delta provides insights into the glacial history of the region. The base of the described succession is a hummocky regional reflector interpreted to be a flooding surface formed immediately after retreat of glacial ice from the Mackenzie Trough. Above this flooding surface, two progradational parasequences are present. The first, assigned to the transgressive systems tract, is correlated with the Tutsieta Lake readvance of the ice sheet at approximately 13 000 BP. A flooding surface forming the upper boundary of this parasequence extends inland to at least Inuvik, developing as a response to glacial retreat and early Holocene relative sea level rise. The second parasequence of Holocene deltaic deposits is assigned to the highstand systems tract and is characterized by progressive progradation of the delta into the Mackenzie Trough to a position seaward of the present delta coastline. A distinct reduction in gradient of the most recen.
WATER LEVEL MANAGEMENT OPPORTUNITIES FOR ECOLOGICAL BENEFIT, POOL 5 MISSISSIPPI RWER 1

ABSTRACT: This paper examines the potential to manage Mississippi River water levels for ecological benefits. The study focuses on the Weaver Bottoms, a 4,000 acre backwater marsh in southeastern Minnesota (Pool 5) highly valued for fish and wildlife habitat. The Weaver Bottoms has suffered increasing loss of aquatic vegetation and associated habitat degradation since the 1960s, largely due to persistent high water, sedimentation, wave re‐suspension of sediments, and poor light penetration. In other reaches of the Mississippi River, water level reductions exposing backwater sediments have produced strong vegetative responses due to subaerial exposure of seeds and sediment compaction. Water level management scenarios for Pool 5 were developed using the HEC‐2 water surface profile model. Results indicate that in many years it would be possible to reduce water levels sufficiently to expose much of the Weaver Bottoms, generating a substantial vegetative response. Additional benefits could be expected since both sediment compaction and increased vegetation would reduce re‐suspension of sediments. Shifting management priorities to improve habitat would temporarily impact many river users, including both commercial and recreational boaters. Water level reductions must be coordinated with their needs.
Viscoelasticity of precompacted unconsolidated sand with viscous cement

The elastic properties of sand strongly depend on the grains’ contact stiffness, which can be increased significantly by solid matter and, depending on frequency, viscous fluid acting as contact cement. To calculate seismic velocities in precompacted fluid-cemented sand, we examine how a small amount of viscous fluid at the grain contacts influences their normal and tangential stiffnesses as a function of effective pressure. Using the Hertz-Mindlin approach and considering oscillatory loading in addition to precompaction of a combination of two elastic spheres, we extend the dry-contact elastic theory by a viscoelastic formulation. Here, we describe the radial flow of the fluid cement induced by the oscillations of the grains’ surfaces around the direct contact, a process that leads to a complex normal stiffness and stiffness/frequency dispersion. In the resulting combined model, the low-frequency real part of the complex normal stiffness identical is to the original Hertz-Mindlin expression. The magnitud.
Flux and bioavailability of Cape Fear River and rainwater dissolved organic carbon to Long Bay, southeastern United States

This study presents the first comparison of riverine and rainwater dissolved organic carbon (DOC) flux to a coastal region, and the first examination of rainwater DOC bioavailability. The bioavailability of DOC from these two sources was determined because its impact on coastal waters depends on whether DOC is labile or refractory. The study site, Long Bay, off the North Carolina and South Carolina coasts in the southeastern United States, receives external sources of DOC from the Cape Fear River system and rainwater. Conservative mixing of estuarine DOC, and a consistent DOC value for the river sources entering the Cape Fear Estuary (Cape Fear and Black rivers combined: 937 ± 178 μM, n = 12; Northeast Cape Fear River: 1266 ± 196 μM, n = 8) allowed for a calculation of DOC flux using river DOC values and U.S.G.S. river flow data. Rainwater DOC flux was determined by a deposition calculation at a rainwater collection station in Wilmington, N. C. , 40 km from Long Bay. Riverine DOC flux was determined to be (77 × 109 gCyr−1) or roughly 4x the rainwater flux (21 × 109 gCyr−1) on an annual basis. The bioavailability of the riverine DOC (9.0 ± 4.5%) was much less than that of rainwater (63 ± 14%). Therefore, taking into account only bioavailable DOC, rainwater provides more labile DOC (13 × 109 gCyr−1) to Long Bay than riverwater (7 × 109 gCyr−1) meaning that rainwater is important for fueling secondary productivity whereas river DOC is important for long‐term storage of carbon.
Tests of fixity of the Indo‐Atlantic hot spots relative to Pacific hot spots

Rates of inter‐hot spot motion have been debated for decades. Herein we present updated predictions for the tracks of the Tristan da Cunha, Réunion, and Iceland hot spots assuming them to be fixed relative to Pacific hot spots. Uncertainties in Pacific hot spot rotations, which include uncertainties in the current locations of hot spots of 100–200 km, are combined with uncertainties in relative plate motions accumulated through the plate circuit to obtain the final uncertainty in the predicted positions (including uncertainties of 150–200 km in the current locations of the Indo‐Atlantic hot spots). Improvements to reconstruction methods, to relative plate reconstructions, to age dates along the tracks, and to the geomagnetic reversal timescale lead to significant changes from prior results. When compared with the observed tracks, the predicted tracks indicate nominal rates of motion of only 2–6 mm a−1 of these Indo‐Atlantic hot spots relative to Pacific hot spots over the past 48 Ma. Within the uncertainties, the rates range from no motion to rates as high as 8–13 mm a−1. For reconstructions prior to 48 Ma B.P., however, the apparent rates of inter‐hot spot motion are much larger, 46–55 ± 20 mm a−1, if the motion occurred entirely between 68 Ma B.P. and 48 Ma B.P. Either hot spots moved rapidly before 48 Ma B.P., and slowed drastically at ≈ 48 Ma B.P., or global plate circuits through Antarctica become less reliable as one goes increasingly further into the past. Most paleomagnetic data favor the latter explanation.
Use of Forest Resources by Residents of Jigme Singye Wangchuck National Park, Bhutan

Abstract This paper examines the use of forest resources by local residents in Jigme Singye Wangchuck National Park, Bhutan. It also inquires into local residents' knowledge and perceptions of park management interventions. The data were collected through a questionnaire survey, group discussions, and observations. The results show that local people depend on forest resources for their livelihoods, and that their knowledge and perceptions of the park and of park management are influenced mainly by constraints on their access to forest resources, and by benefits and incentives obtained from the park administration through socioeconomic development.
Subglacial plant remains from the Omnsbreen glacier area, south Norway

Plant remains have been found on ground recently deglaciated from the Omnsbreen glacier. They consist of Salix herbacea, Salix spp. , Silene acaulis, Polytrichum norvegicum, Kiaeria of. starkei, and some unidentified species. Their age has been determined by the radiocarbon method to approx. 550 years, indicating that the present Omnsbreen glacier emerged as late as the clima deterioration in the late Middle Ages. The past vegetation was similar to the present, but slightly more thermophilous, indicating a rapid clima deterioration in the fourteenth century.
Impacts of snow cover fraction data assimilation on modeled energy and moisture budgets

Two data assimilation (DA) methods, a simple rule‐based direct insertion (DI) approach and a one‐dimensional ensemble Kalman filter (EnKF) method, are evaluated by assimilating snow cover fraction observations into the Community Land surface Model. The ensemble perturbation needed for the EnKF resulted in negative snowpack biases. Therefore, a correction is made to the ensemble bias using an approach that constrains the ensemble forecasts with a single unperturbed deterministic LSM run. This is shown to improve the final snow state analyses. The EnKF method produces slightly better results in higher elevation locations, whereas results indicate that the DI method has a performance advantage in lower elevation regions. In addition, the two DA methods are evaluated in terms of their overall impacts on the other land surface state variables (e.g., soil moisture) and fluxes (e.g., latent heat flux). The EnKF method is shown to have less impact overall than the DI method and causes less distortion of the hydrological budget. However, the land surface model adjusts more slowly to the smaller EnKF increments, which leads to smaller but slightly more persistent moisture budget errors than found with the DI updates. The DI method can remove almost instantly much of the modeled snowpack, but this also allows the model system to quickly revert to hydrological balance for nonsnowpack conditions.
Longmen Shan fold-thrust belt and its relation to the western Sichuan Basin in central China: New insights from hydrocarbon exploration

The Longmen Shan fold-thrust belt is one of the key regions of demonstrable Mesozoic–Cenozoic tectonic evolution in China, and the Sichuan Basin was the first natural-gas-producing area in China. In this article, the structural features of the Longmen Shan belt are presented, using both seismic profiles and field data. The complex structures of the northeast-trending Longmen Shan fold-thrust belt and its foreland in the western Sichuan Basin are formed by southeast-directed thrusting. Several eastward-verging, rootless thrust sheets and imbricates of Cambrian–Triassic rocks have been recognized in the northern Longmen Shan belt. Evidence suggests that the northern Longmen Shan belt experienced at least two major periods of deformation in the Late Triassic and Cenozoic. However, the southern Longmen Shan belt is represented by the basement-involved thrust structures and klippen, and its major periods of deformation were in the latest Cretaceous–early Cenozoic. Sedimentary features in the western Sichuan Basin reflect a two-phase flexural-loading history and illustrate that the Late Triassic foreland basin extends along the foredeep of the entire length of the Longmen Shan belt, but the uppermost Cretaceous–Paleogene rejuvenated foreland basin is restricted in the southern part of the western Sichuan Basin. Structural geometries suggest that prospective traps are mainly developed in the frontal zone of the Longmen Shan fold-thrust belt and in the southern part of the western Sichuan Basin. One of the major contributions of this article is finding preexisting Paleozoic rift basins under the Cenozoic thin-skinned thrust belts, which represent a new potential hydrocarbon play.
EFFECTS OF SCALE ON LAND USE AND WATER QUALITY RELATIONSHIPS: A LONGITUDINAL BASIN‐WIDE PERSPECTIVE 1

ABSTRACT: Human land use is a major source of change in catchments in developing areas. To better anticipate the long‐term effects of growth, land use planning requires estimates of how changes in land use will affect ecosystem processes and patterns across multiple scales of space and time. The complexity of biogeochemical and hydrologic interactions within a basin makes it difficult to scale up from process‐based studies of individual reaches to watershed scales over multiple decades. Empirical models relating land use/land cover (LULC) to water quality can be useful in long‐term planning, but require an understanding of the effects of scale on apparent land use‐water quality relationships. We empirically determined how apparent relationships between water quality and LULC data change at different scales, using LIJLC data from the Willapa Bay watershed (Washington) and water quality data collected along the Willapa and North Rivers. Spatial scales examined ranged from the local riparian scale to total upstream catchment. The strength of the correlations between LTJLC data and longitudinal water quality trends varied with scale. Different water quality parameters also varied in their response to changes in scale. Intermediate scales of land use data generally were better predictors than local riparian or total catchment scales. Additional data from the stream network did not increase the strength of relationships significantly. Because of the likelihood of scale‐induced artifacts, studies quantifying land use‐water quality relationships performed at single scales should be viewed with great caution.