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  • 1
    Online-Ressource
    Online-Ressource
    Atmosphere and Climate : Physics, Composition/Dynamics and Health Impacts. (2013)
    Hauppauge :Nova Science Publishers, Incorporated,
    Details
    Schlagwort(e): Climatic changes. ; Global warming. ; Carbon sequestration. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (117 pages)
    Ausgabe: 1st ed.
    ISBN: 9781624174346
    Serie: Earth Sciences in the 21st Century
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=3020409
    DDC: 551.5
    Sprache: Englisch
    Anmerkung: Intro -- ATMOSPHERE AND CLIMATE -- ATMOSPHERE AND CLIMATE -- CONTENTS -- PREFACE -- CAN ICE SHEETS SELF-DESTRUCT AND CAUSE RAPID CLIMATE CHANGE? -- ABSTRACT -- INTRODUCTION -- A HOLISTIC ICE-SHEET MODEL -- APPLICATION TO JAKOBSHAVN ISBRAE -- RESULTS FOR JAKOBSHAVN ISBRAE -- CONCLUSION -- ACKNOWLEDGMENTS -- REFERENCES -- GLOBAL WARMING IN A CONTEXT OF THE MILLENNIAL CLIMATE HISTORY -- ABSTRACT -- INTRODUCTION -- GLOBAL WARMING OF 20 CENTURY -- METHODS OF STUDYING OF THE EARTH'S CLIMATE IN THE PAST -- Dendroclimatology -- Stable Isotope Climatology -- Other Sources of Paleoclimatic Information -- GLOBAL WARMING AND TREE-RING PROXIES -- GLOBAL WARMING AND BOREHOLE DATA -- GLOBAL WARMING IN ARCTIC -- CLIMATE MODELING AND FORCING FACTORS -- FORECAST OF FUTURE CLIMATIC CHANGE -- CONCLUSION -- ACKNOWLEDGMENTS -- REFERENCES -- TEMPORAL AND SPATIAL PATTERNS OF PM10 CONCENTRATIONS AT AN URBAN AREA -- ABSTRACT -- 1. INTRODUCTION -- 2. DATA AND METHODS -- 2.1. Data -- 2.2. Principal Component Analysis -- 3. RESULTS AND DISCUSSION -- 3.1. Statistics and Exceedances to EU Limits -- 3.2. PCA Results -- 3.3. PM Annual Profiles -- CONCLUSION -- ACKNOWLEDGMENTS -- REFERENCES -- DEVELOPMENT AND EVALUATION OF FIBROUS ADSORBENTS FOR CARBON DIOXIDE REMOVAL -- ABSTRACT -- 1. INTRODUCTION -- 2. FIBROUS ADSORBENTS FOR CO22 CAPTURE -- 2.1. Amine-modified Fibrous Adsorbents -- 2.1.1. Glass Fibrous Adsorbent -- 2.1.2. Fibrous Polyacrylonitrile (PAN) Adsorbent -- 2.1.3. Nanofibrillated Cellulose (NFC) Adsorbent -- 2.1.4. Mesoporous Silica/Cotton Fibrous Adsorbent -- 2.2. Carbon Fiber Adsorbents -- 2.2.1. Carbon Fiber Composite Molecular Sieve (CFCMS) -- 2.2.2. PAN-based Activated Carbon Fiber (PAN-ACF) -- 2.2.3. Graphite Nanofiber (GNF) -- 2.3. Hollow Fiber Membranes for CO Removal -- PERSPECTIVE AND CONCLUSION -- ACKNOWLEDGMENTS -- DISCLAIMER -- CONFLICT OF INTEREST. , REFERENCES -- INDEX.
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    GEOMAR EBL
  • 2
    Buch
    Buch
    Cetaceans and military sonar: a need for better management (2011)
    Oxford : Pergamon
    Details Verfügbarkeit
    Materialart: Buch
    Seiten: S. 1 - 70 , Ill., graph. Darst., Kt
    Serie: Marine Pollution Bulletin 63.2011,1/4
    Sprache: Unbestimmte Sprache
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    GEOMAR KATALOG
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  • 3
    facet.materialart.
    Unbekannt
    (Table 1) Ice thickness of new subglacial lakes identified in the ICECAP RES data and of previously known subglacial lakes (2012)
    PANGAEA
    In:  Supplement to: Wright, Andrew P; Young, Duncan A; Roberts, Jason L; Schroeder, Dustin M; Bamber, Jonathan L; Dowdeswell, Julian A; Young, Neal W; Le Brocq, Anne M; Warner, Roland C; Payne, Antony J; Blankenship, Donald D; van Ommen, Tas D; Siegert, Martin J (2012): Evidence of a hydrological connection between the ice divide and ice sheet margin in the Aurora Subglacial Basin, East Antarctica. Journal of Geophysical Research, 117(F1), F01033, https://doi.org/10.1029/2011JF002066
    Details
    Publikationsdatum: 2024-03-23
    Beschreibung: Subglacial hydrology in East Antarctica is poorly understood, yet may be critical to the manner in which ice flows. Data from a new regional airborne geophysical survey (ICECAP) have transformed our understanding of the topography and glaciology associated with the 287,000 km**2 Aurora Subglacial Basin in East Antarctica. Using these data, in conjunction with numerical ice sheet modeling, we present a suite of analyses that demonstrate the potential of the 1000 km-long basin as a route for subglacial water drainage from the ice sheet interior to the ice sheet margin. We present results from our analysis of basal topography, bed roughness and radar power reflectance and from our modeling of ice sheet flow and basal ice temperatures. Although no clear-cut subglacial lakes are found within the Aurora Basin itself, dozens of lake-like reflectors are observed that, in conjunction with other results reported here, support the hypothesis that the basin acts as a pathway allowing discharge from subglacial lakes near the Dome C ice divide to reach the coast via the Totten Glacier.
    Schlagwort(e): Antarctica; Comment; Event label; Ice thickness; Identification; International Polar Year (2007-2008); IPY; Lake_Aurora; Lake_Concordia; Lake_L1; Latitude of event; Longitude of event; R03Wa_1; R04Ea_9; R05Ea_4; R05Ea_5; R06Wa_4; R07Ea_9; R07Ta_1; R08Wa_0.1; R08Wa_0.2; R13Ea_8; R15Ea_4; Record length; SPRI-28/63; SPRI-33; SPRI-36; SPRI-37; Totten_2
    Materialart: Dataset
    Format: text/tab-separated-values, 76 data points
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    DATA PANGAEA
  • 4
    Digitale Medien
    Digitale Medien
    Site-selective excitation and polarized absorption spectra of Nd3+ in Sr5(PO4)3F and Ca5(PO4)3F (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1746-1758 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Polarized absorption and fluorescence spectra were analyzed to establish individual energy (Stark) levels of Nd3+ ions in host crystals of Sr5(PO4)3F (SFAP) and Ca5(PO4)3F (FAP). Site-selective excitation and fluorescence facilitated differentiation between Nd3+ ions in emitting sites associated with 1.06 μm stimulated emission, and nonemitting Nd3+ ions in other sites. Measurements were made on samples containing different concentrations of Nd3+ at 4 K and higher temperatures. Substitution of Nd3+ for Sr2+ or Ca2+ was accompanied by passive charge compensation during crystal growth. Crystal-field splitting calculations were performed according to site for Stark levels of Nd3+ ions identified spectroscopically. We obtained a final set of crystal-field parameters Bnm for Nd3+ ions in fluorescing sites with a rms. deviation of 7 cm−1 (52 levels in Nd:SFAP) and 8 cm−1 (59 levels in Nd:FAP). For one of the nonemitting sites in Nd:FAP we obtained a final set of Bnm parameters which gave a rms deviation of 6 cm−1 between 46 experimental and calculated levels. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360964
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  • 5
    Digitale Medien
    Digitale Medien
    Site-selective spectroscopy and determination of energy levels in Eu3+-doped strontium fluorophosphate (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2456-2467 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Absorbance and site-selective fluorescence studies of Eu3+:Sr5(PO4)3F (Eu:SFAP) provide a nearly complete characterization of the Eu3+ energy levels. These results are compared with calculated energies generated by lattice-sum analysis. Eu3+ is found to occupy one site predominantly, but numerous minority sites are also evident; polarization studies of absorption and fluorescence lines provide evidence for the principle site having Cs symmetry. Vibronic transitions occur in spectra as well. Interpretation of the lattice location and charge compensation mechanism for the principal site is discussed in the context of obstacles arising from spectral interpretation, high crystal fields in SFAP, low site symmetry, low J-numbers in Eu3+ energy manifolds, and lattice covalency. Eu2+ emission upon ultraviolet excitation is also demonstrated; valleys in the emission profile are attributed to intracrystal absorption by Eu3+. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360099
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  • 6
    Digitale Medien
    Digitale Medien
    A study of O2(a 1Δg) with photoelectron spectroscopy using synchrotron radiation (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 2737-2747 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The atmospherically important species O2(a 1Δg) has been studied by photoelectron spectroscopy using vacuum ultraviolet radiation from a synchrotron as the photon source. Constant-ionic-state (CIS) spectra, recorded for vibrational levels of O2+(X 2Πg) v+=0,1,2,3 accessed from O2(a 1Δg) v″=0, exhibit intense signals in the photon energy region 14.0–15.5 eV which are shown to arise from autoionization from a Rydberg state with an O2+(C 2Φu) core. On the basis of the results obtained and earlier evidence derived from vacuum ultraviolet absorption spectroscopy, this state is assigned as a (C 2Φu,3sσg) 1Φu Rydberg state. Photoelectron spectra recorded for O2(a 1Δg) at positions of strong resonances have allowed extended vibrational structure to be obtained in the first photoelectron band. The relative vibrational component intensities in the resonant photoelectron spectra are in good agreement with computed relative intensities obtained via Franck–Condon calculations, confirming the vibrational numbering of the resonances in the 1Φu state. Competition between autoionization and predissociation in the 1Φu Rydberg state is discussed on the basis of the results obtained. Weaker structure is observed in CIS spectra recorded in the photon energy regions 12.5–13.5 and 15.0–20.0 eV. Suggestions are made for the nature of the highly excited states of O2 associated with this structure, based on available ionization energies and spectroscopic constants of known ionic states accessible from O2(a 1Δg). For example, two broad bands centered at (approximate)16.4 and (approximate)17.75 eV are assigned to excitation to Rydberg states arising from the configurations (D 2Δg,3pπu) and (D 2Δg,4pπu), respectively. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.476872
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  • 7
    Digitale Medien
    Digitale Medien
    A study of the SO molecule with photoelectron spectroscopy using synchrotron radiation (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 821-830 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The SO molecule has been studied by photoelectron spectroscopy using vacuum ultraviolet radiation from a synchrotron as the photon source. Both constant ionic state (CIS) and photoelectron spectra have been recorded. Resonances which appear in the CIS spectra recorded for selected vibrational levels of SO+ X 2Π in the photon energy region hν=11.5–15.0 eV have been assigned to excitations to Rydberg states which converge to the SO+ a 4Π and A 2Π states and autoionize to SO+ X 2Π. Also, resonances which appear in the CIS spectra recorded in the photon energy region 15.0–16.4 eV for selected vibrational levels of SO+ b 4Σ− have been assigned to excitations to Rydberg states which converge to SO+ B 2Σ− and autoionize to SO+ b 4Σ−. Photoelectron spectra recorded at selected resonant photon wavelengths show that autoionization can dramatically alter the intensities of the vibrational components in a photoelectron band and may allow extra vibrational structure to be observed. The additional information obtained from using this method to study short-lived molecules is discussed. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.473227
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  • 8
    Digitale Medien
    Digitale Medien
    A study of the CS molecule with photoelectron spectroscopy using synchrotron radiation (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 6258-6265 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The CS molecule has been studied with constant ionic state (CIS) spectroscopy in the photon energy range 11.2–19.5 eV using radiation from a synchrotron source. The spectra were obtained by monitoring the intensities of the first three vibrational components in the first photoelectron band as a function of photon energy. The structured spectra obtained have been analyzed in terms of excitation to and autoionization from Rydberg states with A 2Π, B 2Σ+, and C 2Σ+ ionic cores. Photoelectron spectra of the first band of CS recorded at selected resonant energies showed extended vibrational structure which was used to obtain improved ionic state vibrational constants for CS+ X 2Σ+ compared to those derived from an off-resonance spectrum. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.476032
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  • 9
    Digitale Medien
    Digitale Medien
    Kelvin-Helmholtz driven modes of the magnetosphere (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4070-4087 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Ultralow frequency (ULF) waves in the magnetosphere are thought to be driven by disturbances of the magnetopause caused by the flow in the magnetosheath. In this paper a model showing how the trapping and excitation of these modes depends upon the shear flow and propagation angle is presented. The ideal magnetohydrodynamics (MHD) equations are used and the perturbations are assumed to be linear. A bounded, uniform magnetospheric cavity, with a finite plasma beta, separated by a vortex sheet from a semi-infinite, field-free, flowing magnetosheath is considered. It is shown that the bounded model allows the trapping and excitation of both fast and slow cavity modes, and that unstable surface modes may also exist. Slow surface modes are unstable only for a small interval of flow speed, becoming fast surface modes for higher flows. Slow cavity modes have small growth rates and are unlikely to be significant observationally. It is shown that fast modes propagating quasiparallel to the flow may be excited for realistic flow speeds, but that for nonparallel modes, much higher flows are required. Finally, an exact method for predicting the onset of instability for fast modes is derived and is shown to occur at the coalescence of modes of opposite energy. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.873669
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  • 10
    Digitale Medien
    Digitale Medien
    Analytical treatment of Alfvén resonances and singularities in nonuniform magnetoplasmas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 691-705 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The linear resonant excitation of Alfvén waves in a cold plasma permeated by a nonuniform magnetic field is considered. The equilibrium magnetic field is irrotational and possesses an invariant coordinate perpendicular to the direction of the field. By solving for the coefficients in a Generalized Frobenius Series the regular and singular solutions may be generated. The singular solution is logarithmic and produces a net absorption of energy at the resonant field line. The efficiency of coupling between the fast mode and the resonant Alfvén mode is determined by the following overlap integral along the resonant field line, ∫(ξβrbγ0/hβ)dl; ξβr is the resonant eigenfunction, bγ0 is the compressional/parallel magnetic field perturbation, and hβ is proportional to the separation of background lines of force in the invariant direction. The amplitude of the singular solution is proportional to this integral, while the rate of energy absorption at the resonance is proportional to its square. It is also shown how the analytical solution at the resonance may be used to avoid problems encountered in numerical solutions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870815
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