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  • 1
    Call number: AWI G3-19-92357
    Type of Medium: Monograph available for loan
    Pages: 204 Seiten , Illustrationen
    ISBN: 978-84-9138-885-5
    Series Statement: Obras colectivas de ciencias 06
    Language: Spanish
    Note: lndice: Prólogo The Circumpolar Active Layer Monitoring Network - CALM III (2009-2014): Long-term Observations on the Climate-Active Layer-Permafrost System, / Frederick E. Nelson and Nikolay l. Shiklomanov Red de Monitoreo Circumpolar de la Capa Activa - CALM III (2009-2014): Observaciones de Largo Plazo del Sistema "Clima-Capa Activa-Permafrost" / Frederick E. Nelson y Nikolay l. Shiklomanov Colaboração Ibérica no Estudo do Estado Térmico do Permafrost nas ilhas Shetlands do Sul (Antárctica Marítima). Estado actual e perspectivas / Gonçalo Vieira Monitorización dinámica y control térmico en geoformas solifluidales del piso crionival de Sierra Nevada / M. Oliva y A. Gómez Ortiz Inestabilidad de laderas durante el Holoceno en el piso periglaciar actual de Sierra Nevada / M. Oliva y A. Gómez Ortiz Evolución reciente y dinámica actual del helero del Jou Negro (Picos de Europa). Primera aproximación / E. Serrano, M. Del Río, J. J. San José, J. J. González Trueba, A. Atkinson, A. Fernández y R. Martín Factores geomorfológicos y nivometeorológicos condicionantes de aludes en el circo de Musales (Pirineo central aragonés): el evento de abril de 2008 / J. Chueca, A. Julián, M. Palomo, E. Muntán, P. Oller, M. Barriendos y E. Gutiérrez Caracterización térmica del suelo en el circo del Aneto (Pirineo central aragonés): cartografía de variaciones estacionales / J. Chueca y A. Julián Comportamiento térmico del suelo en un enclave de alta montaña mediterránea con permafrost residual: Corral del Veleta (Sierra Nevada, Granada, España) / F. Salvador-Franch, A. Gómez-Ortiz y D. Palacios-Estremera Cubierta nival y temperaturas de superficie en Sierra Nevada a través del tratamiento digital de imágenes LANDSAT 7 (avance preliminar: periodo 2007-2008) / Benedita A. Milheiro Santos, Antonio Gómez Ortiz, Montserrat Salvá Catarineu y Ferran Salvador Franch Estado térmico del permafrost en el monte Reina Sofía, primer año de registro continuo. Isla Livingston (Antártida") / M. Ramos, G. Vieira, S. Gruber, MA. de Pablo y A. Correia Nuevas estaciones de medida del régimen térmico del permafrost en el área de "Crater Lake". Isla Decepción (Antártida). Resultados preliminares / M. Ramos, G. Vieira, D. Guilichinski, M. A. de Pablo Distribuição Espacial das Formas e Processos Periglaciários da Área de Cerro Caliente - Crater Lake (ilha Deception, Antárctida Marítima) / R. Melo, G. Vieira, A. Caselli, V. Batista, M. Ramos ERA-Interim torced H-TESSEL scheme for modeling ground temperatures for Livingston lsland (South Shetlands, Antarctic Península), M.J. Rocha, E. Dutra, R. Tomé, G. Vieira, P. Miranda, M. Fragoso, M. Ramos Resultados preliminares de urna campanha de prospecçáo geoeléctrica realizada na llha de Livingston junto a Base Antárctica Búlgara / A. Correia, G. Vieira, M. Ramos Condutividade térmica de testemunhos obtidos em duas perfurações realizadas na ilha de Livingston (Antárctida Marítima). Resultados preliminares / P. M. Amaral, A. Correia, G. Vieira, M. Ramos, A. Trindade Determinación de la difusividad térmica en suelos helados en la Isla Livingston / Juan Jose Blanco, Miguel Angel Hidalgo, Miguel Ramos y GonÇalo Vieira Un nuevo emplazamiento CALMS en la Península Bayers, Isla Livingston, Antártida = A new CALM-S site on Byers península, Livingston island, Antarctica / M. A. de Pablo, M. Ramos, G. Vieira, A. Quesada O efeito da neve no regime térmico do solo na área da Base Antárctica Búlgara St. Kliment Ohridski, llha Livingston, Antárctida / A. Trindade, G. Vieira, M. Ramos, C. Pimpirev, R. Kenderova Detecção da cobertura de neve na ilha Livingston (Antárctida marítima) com imagens de satélite ASAR. Resultados preliminares / C. Mora, G. Vieira, M. Ramos Ensayos de campo del sensor GTS-REMS en la Antártida. Resultados y optimización. / B. Esteban, M. Ramos, E. Sebastián, C. Armiens, M. A. De Pablo y W. Cabos ldentification and characterization of polygonal networks on the Martian boreal plain, / J. Saraiva, L. Bandeira, N. Benavente, P. Pina Studying Martian permafrost from surface temperature data of Mini-TES, Spirit MER mission / A. Molina, M. A. de Pablo, M. Ramos
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Supply chain management 9 (2004), S. 134-138 
    ISSN: 1359-8546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Despite its importance in other disciplines and its rapid proliferation in organizational practice, until recently supply chain management (SCM) has had only a relatively modest impact on management accounting research. This research note focuses on the potential role that management accounting information can play in SCM. From an alternative point of view, a reverse impact of the supply chain activities on management accounting (intra- and inter-firm) practices and uses can be expected. Both perspectives are analysed in this paper.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 84 (1990), S. 314-325 
    ISSN: 1432-1939
    Keywords: Soil seed bank ; Seed rain ; Seed predation ; Tropical pioneers ; Forest mosaics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We used the tropical pioneer tree, Cecropia obtusifolia to evaluate the relative importance of different sources of seeds in the regeneration of species that depend on ephemeral sites. We studied seed production in a population established in a 5 ha plot, and dispersal, dormancy and seed predation in two recent treefall gaps (〈1 year-old), two building or successional forest patches (10–15 since disturbed), and two mature forest patches (〉35 years since disturbed) for a one year period at Los Tuxtlas (Mexico). Flowers and fruits were counted at monthly intervals. Annual fecundity per tree ranged from 1.4×104 to 1.4×107 seeds. Seeds were continuously available on the trees and on the ground. Average annual seed rain per m2 (as measured by 0.5×0.5 m seed traps) varied from 184 to 1925 among the six sites. Distance to nearest seed source and patch type explained more than 60% of the seed rain variation among sites. Soil seed density, estimated by counting seeds from ten samples (78.5 cm2×10 cm deep) collected from each site in October and January, ranged among the six sites from 269 to 4485 seeds per m2 in January and from 204 to 5073 in October. Soil seed viabilities were much lower (17.1% in October and 5.1% in January) than those of rain seeds (48.26%). Annual survivorships of 2.2% were estimated for seeds artificially sown on the soil surface of a gap and a mature patch, and 3.75% in a building patch. In two other experiments seed removal rates ranged from 27% to 98% in 4 days. Removal rates were significantly higher in gap and mature patches than in building patches. Ants (Paratrechina vividula) and grasshopper nymphs (Hygronemobius. sp.) were the main predators. We draw three main conclusions from our data: (1) Pathogens and predators determine low survivorship of C. obtusifolia's seeds in the soil and a rapid turnover rate (1.07 to 1.02 years) of its seed bank; (2) a continuous and copious seed production and an abundant and extensive seed rain replenish the soil seed pool in patches with different disturbance ages at least up to 86 m from nearest source; (3) more than 90% of the seeds contributing to C. obtusifolia seedling recruitment in gaps are less than one year-old. We discuss our results in the context of previous similar studies for tropical forests.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2023-07-19
    Description: Climate induced warming of permafrost soils is a global phenomenon, with regional and site-specific variations, which are not fully understood. In this context, a 2D automated electrical resistivity tomography (A-ERT) system was installed for the first time in Antarctica at Deception Island, associated to the existing Crater Lake site of the Circumpolar Active Layer Monitoring Network (CALM-S). This set-up aims to I) monitor subsurface freezing and thawing processes on a daily and seasonal basis and to map the spatial and temporal variability of thaw depth, and to II) study the impact of short-lived extreme meteorological events on active layer dynamics. In addition, the feasibility of installing and running autonomous ERT monitoring stations in remote and extreme environments such as Antarctica was evaluated for the first time. Measurements were repeated at 4-hour intervals during a full year, enabling the detection of seasonal trends, as well as short-lived resistivity changes reflecting individual meteorological events. The latter is important to distinguish between (1) long-term climatic trends and (2) the impact of anomalous seasons on the ground thermal regime. The A-ERT.txt file contains all ERT surveys which were performed using Wenner electrode configuration. 20 copper plates, which are connected by buried cables to the active boxes, with an electrode spacing of 0.5 m were used in this experiment. This setup yields 56 individual data points for each monitoring data set at six data levels. All data were saved in the Res2Dinv format. The temperature. xlsx file contains air and ground temperatures data during the experiment period. The Air temperature was measured at 160 cm above the surface and ground temperatures in the shallow borehole S3,3 were measured with ibutton-sensors at depths 2.5, 5, 10, 20, 40, 80 and 160 cm.
    Keywords: Active-layer; Antarctica; CALM-S_Crater-lake; Circumpolar Active Layer Monitoring Network; DATE/TIME; Deception Island, Antarctica; Electrical Resistivity Tomography; iButton sensor; MULT; Multiple investigations; Permafrost; Temperature, air; Temperature, ground
    Type: Dataset
    Format: text/tab-separated-values, 2680 data points
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  • 5
    Publication Date: 2023-07-19
    Description: Climate induced warming of permafrost soils is a global phenomenon, with regional and site-specific variations, which are not fully understood. In this context, a 2D automated electrical resistivity tomography (A-ERT) system was installed for the first time in Antarctica at Deception Island, associated to the existing Crater Lake site of the Circumpolar Active Layer Monitoring Network (CALM-S). This set-up aims to I) monitor subsurface freezing and thawing processes on a daily and seasonal basis and to map the spatial and temporal variability of thaw depth, and to II) study the impact of short-lived extreme meteorological events on active layer dynamics. In addition, the feasibility of installing and running autonomous ERT monitoring stations in remote and extreme environments such as Antarctica was evaluated for the first time. Measurements were repeated at 4-hour intervals during a full year, enabling the detection of seasonal trends, as well as short-lived resistivity changes reflecting individual meteorological events. The latter is important to distinguish between (1) long-term climatic trends and (2) the impact of anomalous seasons on the ground thermal regime. The A-ERT.txt file contains all ERT surveys which were performed using Wenner electrode configuration. 20 copper plates, which are connected by buried cables to the active boxes, with an electrode spacing of 0.5 m were used in this experiment. This setup yields 56 individual data points for each monitoring data set at six data levels. All data were saved in the Res2Dinv format. The temperature. xlsx file contains air and ground temperatures data during the experiment period. The Air temperature was measured at 160 cm above the surface and ground temperatures in the shallow borehole S3,3 were measured with ibutton-sensors at depths 2.5, 5, 10, 20, 40, 80 and 160 cm.
    Keywords: Active-layer; Antarctica; CALM-S_Crater-lake; Circumpolar Active Layer Monitoring Network; Deception Island, Antarctica; Electrical Resistivity Tomography; MULT; Multiple investigations; Permafrost
    Type: Dataset
    Format: application/zip, 721.9 kBytes
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  • 6
    Publication Date: 2021-01-12
    Description: Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet to date, no globally consistent assessment of permafrost temperature change has been compiled. Here we use a global data set of permafrost temperature time series from the Global Terrestrial Network for Permafrost to evaluate temperature change across permafrost regions for the period since the International Polar Year (2007–2009). During the reference decade between 2007 and 2016, ground temperature near the depth of zero annual amplitude in the continuous permafrost zone increased by 0.39 ± 0.15 °C. Over the same period, discontinuous permafrost warmed by 0.20 ± 0.10 °C. Permafrost in mountains warmed by 0.19 ± 0.05 °C and in Antarctica by 0.37 ± 0.10 °C. Globally, permafrost temperature increased by 0.29 ± 0.12 °C. The observed trend follows the Arctic amplification of air temperature increase in the Northern Hemisphere. In the discontinuous zone, however, ground warming occurred due to increased snow thickness while air temperature remained statistically unchanged.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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  • 7
    Publication Date: 2020-05-20
    Description: With globalization and immigration, societal contexts differ in sheer variety of resident social groups. Social diversity challenges individuals to think in new ways about new kinds of people and where their groups all stand, relative to each other. However, psychological science does not yet specify how human minds represent social diversity, in homogeneous or heterogenous contexts. Mental maps of the array of society’s groups should differ when individuals inhabit more and less diverse ecologies. Nonetheless, predictions disagree on how they should differ. Confirmation bias suggests more diversity means more stereotype dispersion: With increased exposure, perceivers’ mental maps might differentiate more among groups, so their stereotypes would spread out (disperse). In contrast, individuation suggests more diversity means less stereotype dispersion, as perceivers experience within-group variety and between-group overlap. Worldwide, nationwide, individual, and longitudinal datasets (n= 12,011) revealed a diversity paradox: More diversity consistently meant less stereotype dispersion. Both contextual and perceived ethnic diversity correlate with decreased stereotype dispersion. Countries and US states with higher levels of ethnic diversity (e.g., South Africa and Hawaii, versus South Korea and Vermont), online individuals who perceive more ethnic diversity, and students who moved to more ethnically diverse colleges mentally represent ethnic groups as more similar to each other, on warmth and competence stereotypes. Homogeneity shows more-differentiated stereotypes; ironically, those with the least exposure have the most-distinct stereotypes. Diversity means less-differentiated stereotypes, as in the melting pot metaphor. Diversity and reduced dispersion also correlate positively with subjective wellbeing.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 8
    Publication Date: 2019-05-09
    Description: Humans have evolved cognitive processes favoring homogeneity, stability, and structure. These processes are, however, incompatible with a socially diverse world, raising wide academic and political concern about the future of modern societies. With data comprising 22 y of religious diversity worldwide, we show across multiple surveys that humans are inclined to react negatively to threats to homogeneity (i.e., changes in diversity are associated with lower self-reported quality of life, explained by a decrease in trust in others) in the short term. However, these negative outcomes are compensated in the long term by the beneficial influence of intergroup contact, which alleviates initial negative influences. This research advances knowledge that can foster peaceful coexistence in a new era defined by globalization and a socially diverse future.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 9
    Publication Date: 1998-10-26
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 10
    Publication Date: 2015-06-15
    Description: Although forest succession has traditionally been approached as a deterministic process, successional trajectories of vegetation change vary widely, even among nearby stands with similar environmental conditions and disturbance histories. Here, we provide the first attempt, to our knowledge, to quantify predictability and uncertainty during succession based on the most extensive long-term datasets ever assembled for Neotropical forests. We develop a novel approach that integrates deterministic and stochastic components into different candidate models describing the dynamical interactions among three widely used and interrelated forest attributes—stem density, basal area, and species density. Within each of the seven study sites, successional trajectories were highly idiosyncratic, even when controlling for prior land use, environment, and initial conditions in these attributes. Plot factors were far more important than stand age in explaining successional trajectories. For each site, the best-fit model was able to capture the complete set of time series in certain attributes only when both the deterministic and stochastic components were set to similar magnitudes. Surprisingly, predictability of stem density, basal area, and species density did not show consistent trends across attributes, study sites, or land use history, and was independent of plot size and time series length. The model developed here represents the best approach, to date, for characterizing autogenic successional dynamics and demonstrates the low predictability of successional trajectories. These high levels of uncertainty suggest that the impacts of allogenic factors on rates of change during tropical forest succession are far more pervasive than previously thought, challenging the way ecologists view and investigate forest regeneration.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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