Thermal history of the westernmost Eastern Alps (Penninic Rhenodanubian Flysch nappes,Helvetic nappes,and Subalpine Molasse thrust sheets)     

Michael Zerlauth  Audrey Bertrand  Gerd Rantitsch  Doris Groß  Hugo Ortner  Hannah Pomella  Bernhard Fügenschuh 《International Journal of Earth Sciences》2016,105(5):1525-1547

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Developing observational methods to drive future hydrological science: Can we make a start as a community?     

Keith Beven  Anita Asadullah  Paul Bates  Eleanor Blyth  Nick Chappell  Stewart Child  Hannah Cloke  Simon Dadson  Nick Everard  Hayley J. Fowler  Jim Freer  David M. Hannah  Kate Heppell  Joseph Holden  Rob Lamb  Huw Lewis  Gerald Morgan  Louise Parry  Thorsten Wagener 《水文研究》2020,34(3):868-873

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An approach to hydrograph classification     

David M. Hannah  Barnaby P. G. Smith  Angela M. Gurnell  Glenn R. McGregor 《水文研究》2000,14(2):317-338

The stream hydrograph is an integration of spatial and temporal variations in water input, storage and transfer processes within a catchment. For glacier basins in particular, inferences concerning catchment‐scale processes have been developed from the varying form and magnitude of the diurnal hydrograph in the proglacial river. To date, however, such classifications of proglacial diurnal hydrographs have developed in a relatively subjective manner. This paper develops an objective approach to the classification of diurnal discharge hydrograph ‘shape’ and ‘magnitude’ using a combination of principal components analysis and cluster analysis applied to proglacial discharge time‐series and to diurnal bulk flow indices. The procedure is applied to discharge time‐series from two different glacier basins and four separate ablation seasons representing a gradient of increasing hydrological perturbation as a result of (i) variable water inputs generated by rainstorm activity and (ii) variable location and response of hydrological stores through a systematic decrease in catchment glacierized area. The potential of the technique for application in non‐glacial hydrological contexts is discussed. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Visible–near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS‐REx     

Hannah H. Kaplan  Victoria E. Hamilton  Ellen S. Howell  F. Scott Anderson  M. Antonella Barrucci  John Brucato  Thomas H. Burbine  Beth E. Clark  Ed A. Cloutis  Harold C. Connolly  Elisabetta Dotto  Joshua P. Emery  Sonia Fornasier  Cateline Lantz  Lucy F. Lim  Frederic Merlin  Alice Praet  Dennis C. Reuter  Scott A. Sandford  Amy A. Simon  Driss Takir  Dante S. Lauretta 《Meteoritics & planetary science》2020,55(4):744-765

The primary objective of the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS‐REx) mission is to return to Earth a pristine sample of carbonaceous material from the primitive asteroid (101955) Bennu. To support compositional mapping of Bennu as part of sample site selection and characterization, we tested 95 spectral indices on visible to near infrared laboratory reflectance data from minerals and carbonaceous meteorites. Our aim was to determine which indices reliably identify spectral features of interest. Most spectral indices had high positive detection rates when applied to spectra of pure, single‐component materials. The meteorite spectra have fewer and weaker absorption features and, as a result, fewer detections with the spectral indices. Indices targeting absorptions at 0.7 and 2.7–3 μm, which are attributable to hydrated minerals, were most successful for the meteorites. Based on these results, we identified a set of 17 indices that are most likely to be useful at Bennu. These indices detect olivines, pyroxenes, carbonates, water/OH‐bearing minerals, serpentines, ferric minerals, and organics. Particle size and albedo are known to affect band depth but had a negligible impact on interpretive success with spectral indices. Preliminary analysis of the disk‐integrated Bennu spectrum with these indices is consistent with expectations given the observed absorption near 3 μm. Our study prioritizes spectral indices to be used for OSIRIS‐REx spectral analysis and mapping and informs the reliability of all index‐derived data products, including a science value map for sample site selection.  相似文献   

Constraints on Jupiters from observations of Galactic bulge microlensing events during 2000     

Yiannis Tsapras †  Keith Horne  Richard Carson  Javier Méndez Alvarez  Dan Batcheldor  Alister W. Graham  Philip A. James  Johan Knapen  Hannah Quaintrell  Ignacio Gonzalez Serrano  Peter Sorensen  Nick Wooder 《Monthly notices of the Royal Astronomical Society》2002,337(1):41-48

We present observations of eight Galactic bulge microlensing events taken with the 1.0-m Jacobus Kapteyn Telescope (JKT) on La Palma during 2000 June and July. The JKT observing schedule was optimized using a prioritizing algorithm to automatically update the target list. For most of these events we have sampled the light curves at times where no information was available from the OGLE alert team. We assume a point-source point-lens (PSPL) model and perform a maximum likelihood fit to both our data and the OGLE data to constrain the event parameters of the fit. We then refit the data assuming a binary lens and proceed to calculate the probability of detecting planets with mass ratio   q = 10⁻³  . We have seen no clear signatures of planetary deviations on any of the eight events and we quantify constraints on the presence of planetary companions to the lensing stars. For two well-observed events, 2000BUL31 and 2000BUL33, our detection probabilities peak at ∼30 and ∼20 per cent respectively for   q = 10⁻³  and   a ∼ R _E  for a  Δχ²  threshold value of 60.  相似文献   

Petrology and geochemistry of the 2014–2015 Holuhraun eruption,central Iceland: compositional and mineralogical characteristics,temporal variability and magma storage     

S?mundur?A.?HalldórssonEmail author  Enik??Bali  Margaret?E.?Hartley  David?A.?Neave  David?W.?Peate  Guemundur?H.?Guefinnsson  Ilya?Bindeman  Martin?J.?Whitehouse  Morten?S.?Riishuus  Gro?B.?M.?Pedersen  Sigureur?Jakobsson  Rob?Askew  Catherine?R.?Gallagher  Esther?R.?Guemundsdóttir  Jónas?Gudnason  William?M.?Moreland  Birgir?V.?óskarsson  Paavo?Nikkola  Hannah?I.?Reynolds  Johanne?Schmith  Thorvaldur?Thordarson 《Contributions to Mineralogy and Petrology》2018,173(8):64

The 2014–2015 Holuhraun fissure eruption provided a rare opportunity to study in detail the magmatic processes and magma plumbing system dynamics during a 6-month-long, moderate- to large-volume basaltic fissure eruption. In this contribution, we present a comprehensive dataset, including major and trace elements of whole-rock and glassy tephra samples, mineral chemistry, and radiogenic and oxygen isotope analyses from an extensive set of samples (n?=?62) that were collected systematically in several field campaigns throughout the entire eruptive period. We also present the first detailed chemical and isotopic characterization of magmatic sulfides from Iceland. In conjunction with a unique set of geophysical data, our approach provides a detailed temporal and spatial resolution of magmatic processes before and during this eruption. The 2014–2015 Holuhraun magma is compositionally indistinguishable from recent basalts erupted from the Bárðarbunga volcanic system, consistent with seismic observations for magma ascent close to the Bárðarbunga central volcano, followed by dyke propagation to the Holuhraun eruption site. Whole-rock elemental and isotopic compositions are remarkably constant throughout the eruption. Moreover, the inferred depth of the magma reservoir tapped during the eruption is consistently 8?±?5 km, in agreement with geodetic observations and melt inclusion entrapment pressures, but inconsistent with vertically extensive multi-tiered magma storage prior to eruption. The near constancy in the chemical and isotopic composition of the lava is consistent with the efficient homogenization of mantle-derived compositional variability. In contrast, occurrence of different mineral populations, including sulfide globules, which display significant compositional variability, requires a more complex earlier magmatic history. This may include sampling of heterogeneous mantle melts that mixed, crystallized and finally homogenized at mid- to lower-crustal conditions.  相似文献   

Erratum to: The Alpine nappe stack in western Austria: a crustal-scale cross section     

Hannah Pomella  Hugo Ortner  Michael Zerlauth  Bernhard Fügenschuh 《International Journal of Earth Sciences》2015,104(3):747-748

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Reactivity and temporal variability of volatile organic compounds in the Baltimore/DC region in July 2011     

Hannah S. Halliday  Anne M. Thompson  Debra W. Kollonige  Douglas K. Martins 《Journal of Atmospheric Chemistry》2015,72(3-4):197-213

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Ozone correlations between mid-tropospheric partial columns and the near-surface at two mid-atlantic sites during the DISCOVER-AQ campaign in July 2011     

Douglas K. Martins  Ryan M. Stauffer  Anne M. Thompson  Hannah S. Halliday  Debra Kollonige  Everette Joseph  Andrew J. Weinheimer 《Journal of Atmospheric Chemistry》2015,72(3-4):373-391

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Is the Western and Central Pacific Fisheries Commission meeting its conservation and management objectives?     

Hannah Parris 《Ocean & Coastal Management》2010,53(1):10-26

The Convention of the Conservation and Management of Highly Migratory Fish Stocks in the Western and Central Pacific Ocean is a remarkable achievement in international fisheries cooperative management and significant, albeit slow and uneven, progress has been made by its Commission in promoting the conservation of vulnerable tuna stocks and managing fishing capacity. This paper evaluates current progress and suggests that further progress will be difficult to achieve unless attention is given to addressing the inherent risks in fisheries management and in the underlying incentives facing WCPFC members. Both issues could be addressed over the longer term by drawing on the strengths of existing management strategies that are actively debated within the WCPFC.  相似文献