bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Dynamics of Concentric Eyewall Genesis: Space–Time Empirical Normal Modes Diagnosis
Authors: Martinez Y. , Brunet G. , Yau M. K. , Wang X. 
Published: December 2010

Abstract
A novel statistical technique called space–time empirical normal mode (ST-ENM) is applied in a diagnostic study of the genesis of a secondary eyewall in a simulated hurricane using the nonhydrostatic, high-resolution fifth-generation Pennsylvania State University (PSU)–National Center for Atmospheric Research (NCAR) Mesoscale Model (MM5). The bases obtained from the ST-ENM technique are nonstationary, dynamically relevant, and orthogonal in the sense of wave activity.
The wave activity spectra of the wavenumber-1 anomalies show that the leading modes (1–6) exhibit mainly characteristics of vortex Rossby waves (VRWs). These modes together explain about 75% of the total wavenumber-1 variance in a period of 24 h.
Analysis of the Eliassen–Palm (EP) flux and its time-mean divergence corresponding to the total contribution from these modes indicated that in the lower troposphere VRWs not only propagate inward (outward) in the primary eyewall region where the radial gradient of the basic-state potential vorticity is large and positive (large and negative), but there is also wave activity propagating outside the primary eyewall. Consequently, maximum cyclonic eddy angular momentum is transported not only inside the radius of maximum wind (RMW) by VRWs in the primary eyewall region, but also close to the location where the secondary eyewall forms by VRWs propagating outside the inner eyewall.
The fact that the critical radius for some of the ST-ENMs is contained inside the region where the secondary eyewall forms and the existence of a signal of maximum eddy cyclonic angular momentum flux propagating outward up to the critical radius suggests that a wave–mean flow interaction mechanism and redistribution of angular momentum may be suitable to explain important dynamical aspects of concentric eyewall genesis.
The Variability of the Atlantic Storm Track and the North Atlantic Oscillation: A Link between Intraseasonal and Interannual Variability
Authors: Luo Dehai , Diao Yina , Feldstein Steven B. 
Published: December 2010

Abstract
The winter-mean North Atlantic Oscillation (NAO) index has been mostly positive since the 1980s, with a linear upward trend during the period from 1978 to 1990 (P1) and a linear downward trend during the period from 1991 to 2009 (P2). Further calculations show that the Atlantic storm-track eddy activity is more intense during P2 than during P1, which is statistically significant at the 90% confidence level for a t test. This study proposes a hypothesis that the change in the trend of the positive NAO index from P1 to P2 may be associated with the marked intensification of the Atlantic storm track during P2.
A generalized nonlinear NAO model is used to explain the observed trend of the positive NAO index within P2. It is found that even when the Atlantic storm-track eddies are less intense, a positive-phase NAO event can form under the eddy forcing if the planetary-scale wave has an initial value with a low-over-high dipole structure during P1 and P2. A blocking flow can occur in the downstream side (over Europe) of the Atlantic basin as a result of the energy dispersion of Rossby waves during the decay of the positive-phase NAO event. This blocking flow does not strictly correspond to a negative-phase NAO event because the blocking stays mainly over the European continent. However, when the Atlantic storm-track eddies are rather strong, the blocking flow occurring over the European continent is enhanced and can retrograde into the Atlantic region and finally become a long-lived negative-phase NAO event. In this case, the NAO event can transit from the positive phase to the negative phase. Thus, the winter-mean NAO index during P2 will inevitably decline because of the increase in days of negative-phase NAO events in winter because the Atlantic storm track exhibits a marked intensification in the time interval. The transition of the NAO event from the positive phase to the negative phase can also be observed only when the downstream development of the Atlantic storm-track eddy activity is rather prominent.
Thus, it appears that there is a physical link between intraseasonal and interannual time scales of the NAO when the Atlantic storm track exhibits an interannual variability.
Indirect Impact of Atmospheric Aerosols in Idealized Simulations of Convective–Radiative Quasi Equilibrium. Part II: Double-Moment Microphysics
Authors: Grabowski Wojciech W. , Morrison Hugh 
Published: December 2010

AbstractThis paper extends the previous cloud-resolving modeling study concerning the impact of cloud microphysics on convective–radiative quasi equilibrium (CRQE) over a surface with fixed characteristics and prescribed solar input, both mimicking the mean conditions on earth. The current study applies sophisticated double-moment warm-rain and ice microphysics schemes, which allow for a significantly more realistic representation of the impact of aerosols on precipitation processes and on the coupling between clouds and radiative transfer. Two contrasting cloud condensation nuclei (CCN) characteristics are assumed, representing pristine and polluted conditions, as well as contrasting representations of the effects of entrainment and mixing on the mean cloud droplet size. In addition, four sets of sensitivity simulations are also performed with changes that provide a reference for the main simulation set.As in the previous study, the CRQE mimics the estimates of globally and annually averaged water and energy fluxes across the earth’s atmosphere. There are some differences from the previous study, however, consistent with the slightly lower water vapor content in the troposphere and significantly reduced lower-tropospheric cloud fraction in current simulations. There is also a significant reduction of the difference between the pristine and polluted cases, from ∼20 to ∼4 W m−2 at the surface from ∼20 to ∼9 W m−2 at the top of the atmosphere (TOA). The difference between the homogeneous and extremely inhomogeneous mixing scenarios, ∼20 W m−2 in the previous study, is reduced to a mere 2 (1) W m−2 at the surface (TOA). An unexpected difference between the previous and current simulations is the lower Bowen ratio of the surface heat flux, the partitioning of the total flux into sensible and latent components. It is shown that most of the change comes from the difference in the representation of rain evaporation in the subcloud layer in the single- and double-moment microphysics schemes. The difference affects the mean air temperature and humidity near the surface, and thus the Bowen ratio. The differences between the various simulations are discussed, contrasting the process-level approach with the impact of cloud microphysics on the quasi-equilibrium state with a more appropriate system dynamics approach. The key distinction is that the latter includes the interactions among all the processes in the modeled system.
Precipitation Water Stable Isotopes in the South Tibetan Plateau: Observations and Modeling*
Authors: Gao Jing , Masson-Delmotte V. , Yao T. , Tian L. , Risi C. , Hoffmann G. 
Published: December 2010

Abstract
Measurements of precipitation isotopic composition have been conducted on a daily basis for 1 yr at Bomi, in the southeast Tibetan Plateau, an area affected by the interaction of the southwest monsoon, the westerlies, and Tibetan high pressure systems, as well as at Lhasa, situated west of Bomi. The measured isotope signals are analyzed both on an event basis and on a seasonal scale using available meteorological information and airmass trajectories. The processes driving daily and seasonal isotopic variability are investigated using multidecadal climate simulations forced by twentieth-century boundary conditions and conducted with two different isotopic atmospheric general circulation models [the isotopic version of the Laboratoire de Météorologie Dynamique GCM (LMDZiso) and the ECHAM4iso model]. Both models use specific nudging techniques to mimic observed atmospheric circulation fields. The models simulate a wet and cold bias on the Tibetan Plateau together with a dry bias in its southern part. A zoomed LMDZ simulation conducted with ~50-km local spatial resolution dramatically improves the simulation of isotopic compositions of precipitation on the Tibetan Plateau. Simulated water isotope fields are compared with new data and with previous observations, and regional differences in moisture origins are analyzed using back-trajectories. Here, the focus is on relationships between the water isotopes and climate variables on an event and seasonal scale and in terms of spatial and altitudinal isotopic gradients. Enhancing the spatial resolution is crucial for improving the simulation of the precipitation isotopic composition.
Equatorial Asymmetry of the East Pacific ITCZ: Observational Constraints on the Underlying Processes
Authors: Masunaga Hirohiko , L’Ecuyer Tristan S. 
Published: December 2010

Abstract
The equatorial asymmetry of the east Pacific intertropical convergence zone (ITCZ) is explored on the basis of an ocean surface heat budget analysis carried out with a variety of satellite data products. The annual mean climatology of absorbed shortwave flux exhibits a pronounced meridional asymmetry due to a reduction of insolation by high clouds in the north ITCZ. Ocean mixed layer advection has the largest, if not exclusive, effect of counteracting this shortwave-exerted asymmetry. Other heat fluxes, in particular latent heat flux, predominate over the advective heat flux in magnitude but are secondary with respect to equatorial asymmetry. The asymmetry in advective heat flux stems from a warm pool off the Central American coast and, to a lesser extent, the North Equatorial Counter Current, neither of which exist in the Southern Hemisphere. The irregular continental geography presumably comes into play by generating a warm pool north of the equator and bringing cold waters to the south in the far eastern Pacific.
In addition to the annual climatology, the north–south contrast in the seasonal cycle of surface heat flux is instrumental in sustaining the north ITCZ throughout the year. The northeast Pacific is exposed to a seasonal cycle that is considerably weaker than that in the southeast Pacific, arising from multiple causes including the finite eccentricity of the earth’s orbit and meridional gradient in mixed layer absorptivity. Simple experiments generating synthetic sea surface temperature (SST) illustrate that the muted seasonal cycle of heat flux forcing moderates the SST seasonal variability in the northeast Pacific and thus allows the north ITCZ to persist year round. Existing theories on the ITCZ asymmetry are briefly examined in light of the present findings.
WRF Model Experiments on the Antarctic Atmosphere in Winter
Authors: Tastula Esa-Matti , Vihma Timo 
Published: December 2010

Abstract
The standard and polar versions 3.1.1 of the Weather Research and Forecasting (WRF) model, both initialized by the 40-yr ECMWF Re-Analysis (ERA-40), were run in Antarctica for July 1998. Four different boundary layer–surface layer–radiation scheme combinations were used in the standard WRF. The model results were validated against observations of the 2-m temperature, surface pressure, and 10-m wind speed at 9 coastal and 2 inland stations. The best choice for boundary layer and radiation parameterizations of the standard WRF turned out to be the Yonsei University boundary layer scheme in conjunction with the fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (MM5) surface layer scheme and the Rapid Radiative Transfer Model for longwave radiation. The respective temperature bias was on the order of 3°C less than the biases obtained with the other combinations. Increasing the minimum value for eddy diffusivity did, however, improve the performance of the asymmetric convective scheme by 0.8°C. Averaged over the 11 stations, the error growths in 24-h forecasts were almost identical for the standard and Polar WRF, but in 9-day forecasts Polar WRF gave a smaller 2-m temperature bias. For the Vostok station, however, the standard WRF gave a less positively biased 24-h temperature forecast. On average, the polar version gave the least biased surface pressure simulation. The wind speed simulation was characterized by low correlation values, especially under weak winds and for stations surrounded by complex topography.
Design and the aesthetics of research
Authors: Roxburgh Mark 
Published: December 2010

Mark Roxburgh’s research over the past decade has focused on the evolving conceptualization, discourse and development of research methodologies for design. This has lead him to question the historical pattern of design whereby the methods and epistemologies of other disciplines are used without addressing the differences between them and design. Design is a complex activity enmeshed in many aspects of our lives. In his article in Design Issues (1992), ‘Prometheus of the Everyday: The Ecology of the Artificial and the Designer’s Responsibility’, Manzini foregrounds the relational nature of this complexity by conceiving design (the artificial) as having an ecology. Roxburgh has written about these matters but his critique has conformed to the conventions of academic publishing and he has found articulating aspects of such complexity constrained by the limits of written language. Increasingly, in design, visualization is used to map complex relationships between things, ideas and actions. In this essentially visual essay, Roxburgh is attempting to graphically identify and explore the relationships of some of these concepts in a manner that echoes these trends and his own research practice. He is aware that sketches of complex phenomena, through a process of interpretation and abstraction, become somewhat reductive. The moments he draws on in crafting the depictions of his views are presented episodically rather than chronologically. Roxburgh sketches out three key historical conceptions of design and the ramifications they have had on our perceptions and practice of it. He depicts these conceptions as being drawn from traditions outside of design and suggests that an alternative strategy may lie within design itself. This strategy calls for an engagement with what he calls the aesthetics of research. He suggests that it is imperative that design encompasses an aesthetic engagement with the world at all levels, and most importantly at the point of design research and conception, for our experience of design is fundamentally aesthetic. He is aware that there is an apparent irony in his use of non design theories to frame aspects of his view but this is a necessary strategy to critique the ontological assumptions inherent within the conceptions of design that he characterizes (one could even say ‘caricatures’). Roxburgh takes the position that there is nothing essentially given about design consciousness. Rather, the characterizations of design consciousness that he outlines all carry (usually implicit) ontological assumptions that may be inappropriate and/or limit design practice. The depiction of design that he offers is based instead on an alternative ontology. While this cannot be empirically verified (no ontology can), he proposes it as a way of extending and critiquing usual conceptions of design practice. No doubt this in turn will be found to have shortcomings of its own.
The host genetic background of DNA repair mechanisms is an independent predictor of survival in diffuse large B-cell lymphoma
Authors: Rossi Davide , Rasi Silvia , Di Rocco Alice , Fabbri Alberto , Forconi Francesco , Gloghini Annunziata , Bruscaggin Alessio , Franceschetti Silvia , Fangazio Marco , De Paoli Lorenzo , Bruna Riccardo , Capello Daniela , Chiappella Annalisa , Lobetti Bodoni Chiara , Giachelia Manuela , Tisi Maria Chiara , Pogliani Enrico M. , Lauria Francesco , Ladetto Marco , Hohaus Stefan , Martelli Maurizio , Vitolo Umberto , Carbone Antonino , Foà Robin , Gaidano Gianluca 
Published: December 2010

AbstractSeveral drugs used for diffuse large B-cell lymphoma (DLBCL) treatment rely on DNA damage for tumor cell killing. We verified the prognostic impact of the host DNA repair genotype in 2 independent cohorts of DLBCL treated with R-CHOP21 (training cohort, 163 cases; validation cohort, 145 cases). Among 35 single nucleotide polymorphisms analyzed in the training series, MLH1 rs1799977 was the sole predicting overall survival. DLBCL carrying the MLH1 AG/GG genotype displayed an increased death risk (hazard ratio [HR] = 3.23; P < .001; q =0 .009) compared with patients carrying the AA genotype. Multivariate analysis adjusted for International Prognostic Index identified MLH1 AG/GG as an independent OS predictor (P < .001). The poor prognosis of MLH1 AG/GG was the result of an increased risk of failing both R-CHOP21 (HR = 2.02; P = .007) and platinum-based second-line (HR = 2.26; P = .044) treatment. Survival analysis in the validation series confirmed all outcomes predicted by MLH1 rs1799977. The effect on OS of MLH1, a component of the DNA mismatch repair system, is consistent with its role in regulating the genotoxic effects of doxorubicin and platinum compounds, which are a mainstay of DLBCL first- and second-line treatment.
Mediologie – Christologie. Konturen einer Grundfigur mittelalterlicher Medialität
Authors: Kiening Christian 
Published: December 2010

Abstract
One cannot scrutinize mediality in a pre-media age without referring to the complex issue of Christology. The idea of Christ as medium and mediator concerns not only particular theological questions but also general issues of translation and transference, as well as models of word and image. This paper sketches first the notion of Christ′s mediality up to early Scholasticism and then highlights the new conceptual patterns developed by Bonaventure (Collationes in Hexaemeron) and Nicolas of Cusa (De visione dei).
Repräsentieren mit Karten als mediales Modell
Authors: Stercken Martina 
Published: December 2010

Abstract
The paper explores medieval representations of potentates with maps, a model for showcasing spatial power still in use today. It shows that in different contexts of transmission – in texts and images or as elements of reconstructed palace furnishing – maps are always ingredients of a complex medial situation conveying perceptions of the nature of rulership to an educated public. Representing general or concrete claims on space, they interact individually with recurrent components of the stylisation of power-bearers, such as representations of divine and genealogical legitimation, and of knowledge and virtues.
Cutting Edge. The Economy of Mediality in Twelfth-Century Chirographic Writing
Authors: Bedos-Rezak Brigitte Miriam 
Published: December 2010

Zusammenfassung
Chirographen präsentieren medial komplexe Situationen. Ihr Text, ihr Beschreibstoff, ihre Bildlichkeit, ihr Layout und das Siegel tragen ebenso zur Vermittlung ihrer Bedeutung bei wie ihre Herstellung. Wie diese Elemente eingesetzt werden, in welcher Weise sie wirksam werden und welche Bedeutung ihnen beigemessen wird, ist Gegenstand dieses Beitrags. Ausgehend von französischer Überlieferung aus dem 12. Jahrhundert wird gezeigt, dass Chirographen besonders wirkungsvolle Formen der Zurschaustellung von Verträgen sein können, die in besonderem Maße Körperlichkeit ausstellen und durch das Oszillieren zwischen dem Ganzen und seine Teilen wie auch zwischen physisch Präsentem und Transzendentem Status und Autorität des Adels inszenieren.
Komplexe Boten Metonymisches Erzählen in Wolframs ’Parzival‘
Authors: Chabr Sabine 
Published: December 2010

Abstract
This contribution analyzes a literary model of mediality, namely the representation of messengers in ‘Parzival’ by Wolfram von Eschenbach. On the one hand, this text conveys historical forms of mediality; on the other hand, there is also the specific mediality of the narrative text itself. It is suggested that the concept of metonymy could be helpful to model this double perspective. As far as the story is concerned, mediality is caused by spatial and temporal relationships and has a certain metonymic character, because the messenger is not only a bearer of a signifier, but at the same time part of the signified. On the formal level, these relationships demonstrate a general principle of narrative organization and transmission. Several parts of the narrative text are repeated, thus creating a relationship between the original and the repetition. The messenger represents after all not only a historical medial phenomenon, but at the same time a narrative principle that could be described as “metonymic narration”.
Unlocking the Secrets for Viable and Sustainable Shale Gas Development
Authors: Tollefsen Ed , Alford Jeff , Kok Jeffrey , Perry Andrew , Han Shim Yen , Malpani Raj , Baihly Jason , Vauter Eric 
Published: December 2010

Abstract
In shale plays where horizontal wells are often required to achieve profitability, a common industry practice is to start evaluation of a prospect by drilling vertical or low-angle wells. Extensive formation evaluation measurements, which are then used as points of reference are then run. Interpretation data acquired from vertical wells is used to describe the local reservoir and determine horizontal well placement objectives. Horizon depths may be adjusted for depth based on surface seismic or observations from other wells, otherwise formation properties in the horizontal are considered to be invariant. Acquiring formation evaluation measurements along the lateral is often considered to provide little additional value, are not worth the extra rig time, risk, additional cost, and difficulties associated with tool conveyance. These wellbores typically will be stimulated to test production or converted to a horizontal well via sidetracking.
Horizontal wells are commonly steered using simple gamma-ray measurements correlated with the vertical pilot wells. Detailed examination has revealed that steering results for horizontal wells, using averaged gamma ray correlation techniques and subsequent structural modeling, yield non-unique solutions. This may result in less than optimum reservoir exposure over the drilled interval. With the integration of Logging While Drilling (LWD) technology into the Bottom Hole Assembly (BHA), real-time formation evaluation measurements provide key information for detailed rock property assessment across the target structure, consistent with pilot or offset well evaluation methods, and facilitate accurate well placement. Additionally, real-time and pseudo real-time LWD measurements have been successfully used for hazard avoidance, enhanced penetration rates reducing drilling time, and most importantly completion design optimization. While the LWD method offers some appreciation for the inconsistent rock quality and variable production results across wells, it also provides conclusive insight into the reservoir-production relationship. Understanding of this relationship provides for target refinement within the reservoir column and an optimized completion for an overall increase in reserve recovery.
This paper investigates the use of gamma ray-only measurements only for evaluation and geosteering, and then details the geosteering application using more robust formation evaluation and the subsequent completion optimization. Results are verified using micro-seismic monitoring and production data within a shale gas play. In this manner, structural models, formation evaluation and completion designs are combined to form the technological foundation that can unlock the secrets for viable and sustainable shale gas development.