173 research outputs found
Data for: Oceanic and atmospheric modes in the Pacific and Atlantic Oceans since the Little Ice Age (LIA): towards a synthesis
No full textThe synthesized data generated in this study were uploaded
Reconstructed Jing River streamflow from western China: A 399-year perspective for hydrological changes in the Loess Plateau
No full textThe Jing River is a secondary tributary of the Yellow River, which flows through the middle of the Loess Plateau in China. Severe water scarcity and soil erosion in the basin have threatened sustainable social and economic development. To assess and solve the region's water resource problems, it is important to understand its historical hydrological climate change. Accordingly, we used five machine learning models and simple linear regression to reconstruct the January-June streamflow of the Jing River based on the tree ring width of Pinus tabulaeformis and Pinus armandii. By combining six models into an ensemble streamflow reconstruction, we obtained a more accurate reconstruction and streamflow variability information than with a single model. Over the past nearly four centuries, the Jing River has experienced seven high streamflow periods and ten low streamflow periods. The main atmospheric forcing factors driving the streamflow variability are the Pacific Decadal Oscillation and the El Niño-Southern Oscillation, which regulate the climate and hydrology of the region by affecting water vapor fluxes and the Asian monsoon. The different climate scenarios revealed the continued reduction in the future Jing River streamflow and a worsening water resource situation. This new streamflow reconstruction can serve as a valuable reference for analyzing regional hydrology and informing water resource management and policy formulations.Fil: Zhao, Xiaoen. Yunnan University; ChinaFil: Fang, Keyan. Fujian Normal University; ChinaFil: Chen, Feng. Yunnan University; ChinaFil: Hadad, Martín Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Centro de Investigaciones de la Geosfera y Biosfera. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones de la Geosfera y Biosfera; ArgentinaFil: Roig Junent, Fidel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentin
Op soek na\u27n Mediabestel vir Suid·Afrika: \u27n Voorlopige antwoord aan Keyan Tomaselli
No full textCOMMUNICARE encourages the scientific debate. Our last contribu tion is published in response to the article of Tomaselli & Louw In 9(1), who questioned some of the predie tions regarding post-apartheid media In an earlier article by the author pub lished In 8(1). These are his repiles... Prof Keyan Tomaselli, Director of the Cultural Studies Unit at the University of Natal (Durban), is without doubt one of most prolific writers in the field of South African media and communication studies. This is not a matter of c tention; what is at stake in this review article Is the way in which Tomaselll deals with statements and facts in his pub lications. It is argued that Tomaselli Is prone to state a debatable point as a "scientific fact" and then proceeds to build a whole theoretical argument on this and similar "facts". It is fur ther argued that his article: \u27Vrye Weekblad\u27 and post-apartheld mania; what to do with the press? is a case In point
Abrupt shift to hotter and drier climate over inner East Asia beyond the tipping point
No full textUnprecedented heatwave-drought concurrences in the past two decades have been reported over inner East Asia. Tree-ring–based reconstructions of heatwaves and soil moisture for the past 260 years reveal an abrupt shift to hotter and drier climate over this region. Enhanced land-atmosphere coupling, associated with persistent soil moisture deficit, appears to intensify surface warming and anticyclonic circulation anomalies, fueling heatwaves that exacerbate soil drying. Our analysis demonstrates that the magnitude of the warm and dry anomalies compounding in the recent two decades is unprecedented over the quarter of a millennium, and this trend clearly exceeds the natural variability range. The “hockey stick”–like change warns that the warming and drying concurrence is potentially irreversible beyond a tipping point in the East Asian climate system
Ethical Procedures? A Critical Intervention: The sacred, the profane, and the planet
No full textIssues relating to ethical clearance, how these procedures relate to very different ontologies, ways of making sense,conditions of existence, and the ideological implications thereof are critically discussed. Written as an invited intervention, the author takes readers through a variety of paradigms: indigenous approaches involving the sacred and the profane, instrumentalization of research; multispeciesism and research as a lived practice. Comments are offered on the nature of science and some questions are posed on the contradictions of ethical practices that readers encounter. The method is eclectic, read through a Peirceian pragmatism, and the outcome proposes relationality rather than the inevitability of discrete findings. Some conclusions are offered on the geographical distribution of populations sampled.</jats:p
A self-reflexive analysis of Communicare: Inter-paradigmatic repositioning
No full textThis partly autoethnographical account of my experiences as an author, editor and researcheroffers an experiential framework with which to make sense of publishing in the contemporaryera, governed as it is by neoliberal managerialist principles that tend to reduce activities tomeasureable units so as to render academic disciplines comparable. This is the context withinwhich Communicare is repositioning itself in communication and media studies, situated as it isbetween positivist communication science and interpretivist critical theory. Historical elements ofthe journal are examined via the author’s long-term association with it. The article ends with anexamination of the problems that scholarly work faces when universities measure finite productsat the expense of processes
An interdecadal climate dipole between Northeast Asia and Antarctica over the past five centuries
No full textClimate models emphasize the need to investigate inter-hemispheric climatic interactions. However, these models often
underestimate the inter-hemispheric differences in climate change. With the wide application of reanalysis data since 1948,
we identified a dipole pattern between the geopotential heights (GPHs) in Northeast Asia and Antarctica on the interdecadal
scale in boreal summer. This Northeast Asia/Antarctica (NAA) dipole pattern is not conspicuous on the interannual scale,
probably in that the interannual inter-hemispheric climate interaction is masked by strong interannual signals in the tropics
associated with the El Niño-Southern Oscillation (ENSO). Unfortunately, the instrumental records are not sufficiently longlasting
to detect the interdecadal variability of the NAA. We thus reconstructed GPHs since 1565, making using the proxy
records mostly from tree rings in Northeast Asia and ice cores from Antarctica. The strength of the NAA is time-varying and
it is most conspicuous in the eighteenth century and after the late twentieth century. The strength of the NAA matches well
with the variations of the solar radiation and tends to increase in along with its enhancement. In boreal summer, enhanced
heating associated with high solar radiation in the Northern Hemisphere drives more air masses from the South to the North.
This inter-hemispheric interaction is particularly strong in East Asia as a result of the Asian summer monsoon. Northeast
Asia and Antarctica appear to be the key regions responsible for inter-hemispheric interactions on the interdecadal scale in
boreal summer since they are respectively located at the front and the end of this inter-hemispheric trajectory
Precipitation over the past four centuries in the Dieshan Mountains as inferred from tree rings: An introduction to an HHT-based method
No full textTo improve our understanding of the Asian monsoon system, we developed a hydroclimate reconstruction in a marginal monsoon shoulder region for the period prior to the industrial era. Here, we present the first moisture sensitive tree-ring chronology, spanning 501 years for the Dieshan Mountain area, a boundary region of the Asian summer monsoon in the northeastern Tibetan Plateau. This reconstruction was derived from 101 cores of 68 old-growth Chinese pine (Pinus tabulaeformis) trees. We introduce a Hilbert–Huang Transform (HHT) based standardization method to develop the tree-ring chronology, which has the advantages of excluding non-climatic disturbances in individual tree-ring series. Based on the reliable portion of the chronology, we reconstructed the annual (prior July to current June) precipitation history since 1637 for the Dieshan Mountain area and were able to explain 41.3% of the variance. The extremely dry years in this reconstruction were also found in historical documents and are also associated with El Niño episodes. Dry periods were reconstructed for 1718–1725, 1766–1770 and 1920–1933, whereas 1782–1788 and 1979–1985 were wet periods. The spatial signatures of these events were supported by data from other marginal regions of the Asian summer monsoon. Over the past four centuries, out-of-phase relationships between hydroclimate variations in the Dieshan Mountain area and far western Mongolia were observed during the 1718–1725 and 1766–1770 dry periods and the 1979–1985 wet period
CNN vs. SIFT for Image Retrieval: Alternative or Complementary?
No full textIn the past decade, SIFT is widely used in most vision tasks such as image retrieval. While in recent several years, deep convolutional neural networks (CNN) features achieve the state-of-the-art performance in several tasks such as image classification and object detection. Thus a natural question arises: for the image retrieval task, can CNN features substitute for SIFT? In this paper, we experimentally demonstrate that the two kinds of features are highly complementary. Following this fact, we propose an image representation model, complementary CNN and SIFT (CCS), to fuse CNN and SIFT in a multi-level and complementary way. In particular, it can be used to simultaneously describe scene level, object-level and point-level contents in images. Extensive experiments are conducted on four image retrieval benchmarks, and the experimental results show that our CCS achieves state-of-the-art retrieval results.CPCI-S(ISTP)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Encoding/Decoding, the transmission model and a court of law
No full textAbstract: Stuart Hall’s encoding/decoding model is discussed in terms of CS Peirce’s theory of the interpreter and interpretant. This historical semiotic window frames an example to which the Hall model was applied in South Africa to oppose a military dirty tricks campaign that involved a Supreme Court case brought against the Minister of Defence by the End Conscription Campaign (ECC) requiring him to cease his disinformation against the ECC. The Minister’s own expert had proposed a transmission model of communication that was defeated by the Peirce-Hall combination. The author argues that the model can be massively strengthened when combined with Peirceian semiotics
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