scholarly journals Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ryuji Asami ◽  
Taketo Matsumori ◽  
Ryuichi Shinjo ◽  
Ryu Uemura ◽  
Yuki Miyaoka ◽  
...  
Keyword(s):  
Nineteenth Century ◽  
Time Series ◽  
Atmospheric Aerosols ◽  
Late Nineteenth Century ◽  
Ryukyu Islands ◽  
Okinawa Island ◽  
Carbon And Oxygen Isotope ◽  
The Ryukyu Islands ◽  
Decadal Variations ◽  
Late Nineteenth

AbstractThe geochemistry of calcifying marine organisms is an excellent proxy for reconstructing paleoceanographic history, but studies of hypercalcified demosponges (sclerosponges) are considerably fewer than those of corals, foraminifers, and bivalves. For this study, we first generated near-annual resolved stable carbon and oxygen isotope (δ13C and δ18O) and element/Ca ratios (Sr/Ca, Ba/Ca, Pb/Ca, U/Ca) time series for 1880–2015 from sclerosponge samples (Acanthochaetetes wellsi) collected at Miyako Island and Okinawa Island in the Ryukyu Islands of southwestern Japan. The δ13C records exhibited a typical variation of anthropogenically derived Suess effects, demonstrating that the rates of decrease of –0.0043‰/year before 1960 and – 0.024‰/year after 1960 in the northwestern subtropical Pacific were respectively similar to and about 1.4 times higher than those of the Caribbean Sea in the tropical Atlantic. Spectral analysis of the δ18O time series revealed significant periodicity of approximately 2, 3, 6.5, 7–10, and 20–30 year/cycle, indicating that sea surface conditions in the southern Ryukyu Islands had been dominated by interannual and decadal variations in temperature and seawater δ18O since the late nineteenth century. The Sr/Ca and U/Ca ratios for the species A. wellsi (high-Mg calcite) might not be a robust proxy for seawater temperatures, unlike Astrosclera willeyana and Ceratoporella nicholsoni sclerosponges (aragonite). An evident increasing Pb/Ca trend after 1950 found in the samples is probably attributable to Pb emissions from industrial activities and atmospheric aerosols in eastern Asian countries. The Ba/Ca variations differ greatly among sampling sites, which might be attributable to the respective local environments. This evidence demonstrates that more high-resolution age determinations and geochemical profilings enable delineation of secular variations in ocean environments on annual and interannual timescales. Results of our study suggest that if sclerosponges living in deeper ocean environments are collected, spatial and vertical oceanographic variations for the last several centuries will be reconstructed along with coral proxy records.

Impact of Duration Thresholds on Atlantic Tropical Cyclone Counts*

2010 ◽  
Vol 23 (10) ◽  
pp. 2508-2519 ◽  
Author(s):  
Christopher W. Landsea ◽  
Gabriel A. Vecchi ◽  
Lennart Bengtsson ◽  
Thomas R. Knutson
Keyword(s):  
Nineteenth Century ◽  
Time Series ◽  
Short Duration ◽  
Alternative Interpretation ◽  
Late Nineteenth Century ◽  
Climate Signal ◽  
Storm Frequency ◽  
Late Nineteenth ◽  
National Hurricane Center

Abstract Records of Atlantic basin tropical cyclones (TCs) since the late nineteenth century indicate a very large upward trend in storm frequency. This increase in documented TCs has been previously interpreted as resulting from anthropogenic climate change. However, improvements in observing and recording practices provide an alternative interpretation for these changes: recent studies suggest that the number of potentially missed TCs is sufficient to explain a large part of the recorded increase in TC counts. This study explores the influence of another factor—TC duration—on observed changes in TC frequency, using a widely used Atlantic hurricane database (HURDAT). It is found that the occurrence of short-lived storms (duration of 2 days or less) in the database has increased dramatically, from less than one per year in the late nineteenth–early twentieth century to about five per year since about 2000, while medium- to long-lived storms have increased little, if at all. Thus, the previously documented increase in total TC frequency since the late nineteenth century in the database is primarily due to an increase in very short-lived TCs. The authors also undertake a sampling study based upon the distribution of ship observations, which provides quantitative estimates of the frequency of missed TCs, focusing just on the moderate to long-lived systems with durations exceeding 2 days in the raw HURDAT. Upon adding the estimated numbers of missed TCs, the time series of moderate to long-lived Atlantic TCs show substantial multidecadal variability, but neither time series exhibits a significant trend since the late nineteenth century, with a nominal decrease in the adjusted time series. Thus, to understand the source of the century-scale increase in Atlantic TC counts in HURDAT, one must explain the relatively monotonic increase in very short-duration storms since the late nineteenth century. While it is possible that the recorded increase in short-duration TCs represents a real climate signal, the authors consider that it is more plausible that the increase arises primarily from improvements in the quantity and quality of observations, along with enhanced interpretation techniques. These have allowed National Hurricane Center forecasters to better monitor and detect initial TC formation, and thus incorporate increasing numbers of very short-lived systems into the TC database.

Contents of Western Sociology of Religion as a Science and Educational Discipline

2002 ◽  
pp. 106-110
Author(s):  
Liudmyla O. Fylypovych
Keyword(s):  
Nineteenth Century ◽  
International Society ◽  
Sociology Of Religion ◽  
Scientific Study ◽  
Late Nineteenth Century ◽  
The West ◽  
Late Nineteenth

Sociology of religion in the West is a field of knowledge with at least 100 years of history. As a science and as a discipline, the sociology of religion has been developing in most Western universities since the late nineteenth century, having established traditions, forming well-known schools, areas related to the names of famous scholars. The total number of researchers of religion abroad has never been counted, but there are more than a thousand different centers, universities, colleges where religion is taught and studied. If we assume that each of them has an average of 10 religious scholars, theologians, then the army of scholars of religion is amazing. Most of them are united in representative associations of researchers of religion, which have a clear sociological color. Among them are the most famous International Society for the Sociology of Religion (ISSR) and the Society for Scientific Study of Religion (SSSR).

John Lloyd Williams (1854–1945): profile of a Snowdonian botanist

2006 ◽  
Vol 33 (1) ◽  
pp. 1-17
Author(s):  
Dewi Jones
Keyword(s):  
Nineteenth Century ◽  
Plant Physiology ◽  
Marine Algae ◽  
Plant Distribution ◽  
The Arctic ◽  
Late Nineteenth Century ◽  
Major Study ◽  
The Subject ◽  
Late Nineteenth

John Lloyd Williams was an authority on the arctic-alpine flora of Snowdonia during the late nineteenth century when plant collecting was at its height, but unlike other botanists and plant collectors he did not fully pursue the fashionable trend of forming a complete herbarium. His diligent plant-hunting in a comparatively little explored part of Snowdonia led to his discovering a new site for the rare Killarney fern (Trichomanes speciosum), a feat which was considered a major achievement at the time. For most part of the nineteenth century plant distribution, classification and forming herbaria, had been paramount in the learning of botany in Britain resulting in little attention being made to other aspects of the subject. However, towards the end of the century many botanists turned their attention to studying plant physiology, a subject which had advanced significantly in German laboratories. Rivalry between botanists working on similar projects became inevitable in the race to be first in print as Lloyd Williams soon realized when undertaking his major study on the cytology of marine algae.

Illustrated Media, the Built Environment and Identity Politics in Fin-de-siècle Catalonia: Printing Images, Making the Nation

2015 ◽  
Vol 4 (2) ◽  
pp. 113-135
Author(s):  
Lucila Mallart
Keyword(s):  
Nineteenth Century ◽  
Built Environment ◽  
Identity Politics ◽  
Nation Building ◽  
Constitutive Relationship ◽  
Fin De Siecle ◽  
Late Nineteenth Century ◽  
Fin De Siècle ◽  
Late Nineteenth

This article explores the role of visuality in the identity politics of fin-de-siècle Catalonia. It engages with the recent reevaluation of the visual, both as a source for the history of modern nation-building, and as a constitutive element in the emergence of civic identities in the liberal urban environment. In doing so, it offers a reading of the mutually constitutive relationship of the built environment and the print media in late-nineteenth century Catalonia, and explores the role of this relation as the mechanism by which the so-called ‘imagined communities’ come to exist. Engaging with debates on urban planning and educational policies, it challenges established views on the interplay between tradition and modernity in modern nation-building, and reveals long-term connections between late-nineteenth-century imaginaries and early-twentieth-century beliefs and practices.

Translating the Scribe: Lithographic Print and Vernacularization in Colonial India, 1857–1915

2019 ◽  
Vol 16 (2-3) ◽  
pp. 281-300
Author(s):  
Amanda Lanzillo
Keyword(s):  
Nineteenth Century ◽  
South Asia ◽  
Indian Subcontinent ◽  
North India ◽  
Late Nineteenth Century ◽  
Book Production ◽  
Manuscript Culture ◽  
Arabic Script ◽  
Literary Cultures ◽  
Late Nineteenth

Focusing on the lithographic print revolution in North India, this article analyses the role played by scribes working in Perso-Arabic script in the consolidation of late nineteenth-century vernacular literary cultures. In South Asia, the rise of lithographic printing for Perso-Arabic script languages and the slow shift from classical Persian to vernacular Urdu as a literary register took place roughly contemporaneously. This article interrogates the positionality of scribes within these transitions. Because print in North India relied on lithography, not movable type, scribes remained an important part of book production on the Indian subcontinent through the early twentieth century. It analyses the education and models of employment of late nineteenth-century scribes. New scribal classes emerged during the transition to print and vernacular literary culture, in part due to the intervention of lithographic publishers into scribal education. The patronage of Urdu-language scribal manuals by lithographic printers reveals that scribal education in Urdu was directly informed by the demands of the print economy. Ultimately, using an analysis of scribal manuals, the article contributes to our knowledge of the social positioning of book producers in South Asia and demonstrates the vitality of certain practices associated with manuscript culture in the era of print.

Siren canora: the mermaid and the mythical in late nineteenth-century science

2008 ◽  
Vol 35 (1) ◽  
pp. 1-14 ◽  
Author(s):  
H. BRINK-ROBY
Keyword(s):  
Nineteenth Century ◽  
Evolutionary Theory ◽  
Focus Of Attention ◽  
British Association ◽  
Social Boundaries ◽  
Late Nineteenth Century ◽  
Darwinian Theory ◽  
Late Nineteenth ◽  
Century Science

This paper argues that, for a number of naturalists and lay commentators in the second half of the nineteenth century, evolutionary – especially Darwinian – theory gave new authority to mythical creatures. These writers drew on specific elements of evolutionary theory to assert the existence of mermaids, dragons and other fabulous beasts. But mythological creatures also performed a second, often contrapositive, argumentative function; commentators who rejected evolution regularly did so by dismissing these creatures. Such critics agreed that Darwin's theory legitimized the mythological animal, but they employed this legitimization to undermine the theory itself. The mermaid, in particular, was a focus of attention in this mytho-evolutionary debate, which ranged from the pages of Punch to the lecture halls of the British Association for the Advancement of Science. Crossing social boundaries and taking advantage of a range of venues, this debate arose in response to the indeterminate challenge of evolutionary theory. In its discussions of mermaids and dragons, centaurs and satyrs, this discourse helped define that challenge, construing and constructing the meanings and implications of evolutionary theory in the decades following Darwin's publication.

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