scholarly journals Atlantic Multidecadal Oscillation (AMO) forcing on the late Holocene Cauca paleolake dynamics, northern Andes of Colombia

2015 ◽  
Vol 11 (4) ◽  
pp. 2649-2664 ◽  
Author(s):  
J. I. Martínez ◽  
S. Obrochta ◽  
Y. Yokoyama ◽  
R. W. Battarbee

Abstract. The Atlantic Multidecadal Oscillation (AMO), is a major driving climate mechanism, in the eastern Caribbean Sea and the South Atlantic Ocean in relation to the dynamics of the South American Monsoon System (SAMS) for the late Holocene. Here we document the AMO signal in the San Nicolás-1 core of the Cauca paleolake (Santa Fé–Sopetrán Basin) in the northern Andes. Wavelet spectrum analysis of the gray scale of the San Nicolás-1 core provides evidence for a 70 yr AMO periodicity for the 3750 to 350 yr BP time interval, whose pattern is analogous to the one documented for the Cariaco Basin. This supports a possible correlation between enhanced precipitation and ENSO variability with a positive AMO phase during the 2000 to 1500 yr BP interval, and its forcing role on the Cauca ria lake deposits, which led to increased precipitation and to the transition from a igapo (black water) to a varzea (white water) environment ca. 3000 yr BP.

The Holocene ◽  
2011 ◽  
Vol 21 (7) ◽  
pp. 1151-1158 ◽  
Author(s):  
Martin S. Brook ◽  
Vince E. Neall ◽  
Robert B. Stewart ◽  
Rob C. Dykes ◽  
Derek L. Birks

Evidence for the timings of inter-hemispheric climate fluctuations during the Holocene is important, with mountain glacier moraine systems routinely used as a proxy for climate. In New Zealand such evidence for glacier expansion during the late Holocene is fragmentary and is limited to glaciers in a narrow zone within the Southern Alps. Here, we present the first evidence for late-Holocene glacier expansion on the North Island of New Zealand in the form of two unconsolidated debris ridges on the south side of the stratovolcano, Mt Taranaki/Mt Egmont, at ~1920 m a.s.l. The two ridges are aligned north–south along the western and eastern sides of a small basin (Rangitoto Flat), which is formed between the main Taranaki cone (to the north), and the parasitic cone of Fanthams Peak (to the south). The approximate age of the ridges is constrained by dated eruptive events and the relationship between ridge locations and the spatial positioning of adjacent volcanic landforms. We propose the ridges formed as two lateral moraines on the margins of a cirque glacier during the final construction phase of Fanthams Peak between 3.3 and 0.5 ka BP, during late-Holocene time. This time interval accords with published cosmogenic 10Be dating of moraine-building episodes in the Southern Alps, indicating the Mt Taranaki moraines are a response to the same regional climatic forcings.


Author(s):  
Alexander J.P. Houben ◽  
Geert-Jan Vis

Abstract Knowledge of the stratigraphic development of pre-Carboniferous strata in the subsurface of the Netherlands is very limited, leaving the lithostratigraphic nomenclature for this time interval informal. In two wells from the southwestern Netherlands, Silurian strata have repeatedly been reported, suggesting that these are the oldest ever recovered in the Netherlands. The hypothesised presence of Silurian-aged strata has not been tested by biostratigraphic analysis. A similar lack of biostratigraphic control applies to the overlying Devonian succession. We present the results of a palynological study of core material from wells KTG-01 and S05-01. Relatively low-diversity and poorly preserved miospore associations were recorded. These, nonetheless, provide new insights into the regional stratigraphic development of the pre-Carboniferous of the SW Netherlands. The lower two cores from well KTG-01 are of a late Silurian (Ludlow–Pridoli Epoch) to earliest Devonian (Lochkovian) age, confirming that these are the oldest sedimentary strata ever recovered in the Netherlands. The results from the upper cored section from the pre-Carboniferous succession in well KTG-01 and the cored sections from the pre-Carboniferous succession in well S05-01 are more ambiguous. This inferred Devonian succession is, in the current informal lithostratigraphy of the Netherlands, assigned to the Banjaard group and its subordinate Bollen Claystone formation, of presumed Frasnian (i.e. early Late Devonian) age. Age-indicative Middle to Late Devonian palynomorphs were, however, not recorded, and the overall character of the poorly preserved palynological associations in wells KTG-01 and S05-01 may also suggest an Early Devonian age. In terms of lithofacies, however, the cores in well S05-01 can be correlated to the upper Frasnian – lower Famennian Falisolle Formation in the Campine Basin in Belgium. Hence, it remains plausible that an unconformity separates Silurian to Lower Devonian strata from Upper Devonian (Frasnian–Famennian) strata in the SW Netherlands. In general, the abundance of miospore associations points to the presence of a vegetated hinterland and a relatively proximal yet relatively deep marine setting during late Silurian and Early Devonian times. This differs markedly from the open marine depositional settings reported from the Brabant Massif area to the south in present-day Belgium, suggesting a sediment source to the north. The episodic presence of reworked (marine) acritarchs of Ordovician age suggests the influx of sedimentary material from uplifted elements on the present-day Brabant Massif to the south, possibly in relation to the activation of a Brabant Arch system.


Prospects ◽  
1982 ◽  
Vol 7 ◽  
pp. 249-266
Author(s):  
Lewis P. Simpson

No scene in Faulkner is more compelling than the one that transpires on a “long still hot weary dead September afternoon” in Yoknapatawpha County, Mississippi, toward the end of the first decade of this century. Quentin Compson sits with Miss Rosa Coldfield in a “dim airless room” still called “the office because her father called it that,” and listens to Miss Rosa tell her version of the story of the “demon” Sutpen and his plantation, Sutpen's Hundred. As she talks “in that grim haggard amazed voice”—“vanishing into and then out of the long intervals like a stream, a trickle running from patch to patch of dried sand”—the 22-year-old Mississippi youth discovers he is hearing not Miss Rosa but the voices of “two separate Quentins.” One voice is that of the “Quentin preparing for Harvard in the South, the deep South dead since 1865 and peopled with garrulous baffled ghosts.” The other voice is that of the Quentin “who was still too young to deserve yet to be a ghost, but nevertheless having to be one for all that, since he was born and bred in the deep South the same as she [Miss Rosa] was.” The two Quentins talk “to one another in the long silence of notpeople, in notlanguage: It seems that this demon—his name was Sutpen—(Colonel Sutpen)—Colonel Sutpen. Who came out of nowhere and without warning upon the land with a band of strange niggers and built a plantation”.


2021 ◽  
pp. 205789112110211
Author(s):  
Zafar Khan

This article primarily focuses on how the increasing US–China competing strategies in Asia-Pacific affect the policies of South Asian rivals India and Pakistan when, on the one hand, the US as part of its offshore balancing grand strategy has been increasing its strategic partnership with India through the transfer of emerging technologies in terms of military modernization process, and on the other hand, China and Pakistan have improved their geo-economic and geostrategic partnership as part of the Chinese grand strategy via the Belt and Road Initiative while enabling Pakistan to produce effective countermeasures against its potential adversary. The article presumes that, in doing so, such competing strategies frame a quadrangle setting comprising of US and India to deter and contain China on the one hand and China and Pakistan to produce countermeasures and try to create a balance to potentially prevent the risk of conflict in South Asia out of such competing strategies at the quadrangle order conceived here. However, in fact, neither the US nor rising China would desire such a possibility of conflict otherwise unintendedly occurring from the intense US–China competing strategies while affecting the policies of the South Asian rivals. The article concludes that the shaping of this quadrangle framework may bring both opportunities and challenges for the South Asian rivals. It also concludes that the more intense the competition between the US and China becomes, the more intense its implications could be on the South Asian rivals, while the reduced tension between China and the US, although unlikely, would have reduced pressure on India and Pakistan relations as well.


1929 ◽  
Vol 19 (1) ◽  
pp. 67-87 ◽  
Author(s):  
Jocelyn Toynbee

The paintings in the triclinium of the Villa Item, a dwelling-house excavated in 1909 outside the Porta Ercolanese at Pompeii, have not only often been published and discussed by foreign scholars, but they have also formed the subject of an important paper in this Journal. The artistic qualities of the paintings have been ably set forth: it has been established beyond all doubt that the subject they depict is some form of Dionysiac initiation: and, of the detailed interpretations of the first seven of the individual scenes, those originally put forward by de Petra and accepted, modified or developed by Mrs. Tillyard appear, so far as they go, to be unquestionably on the right lines. A fresh study of the Villa Item frescoes would seem, however, to be justified by the fact that the majority of previous writers have confined their attention almost entirely to the first seven scenes—the three to the east of the entrance on the north wall (fig. 3), the three on the east wall and the one to the east of the window on the south wall, to which the last figure on the east wall, the winged figure with the whip, undoubtedly belongs.


2018 ◽  
Vol 38 (2) ◽  
pp. 255-286
Author(s):  
Sam Edwards

This article examines how a post-1918 Edwardian commemorative aesthetic focused on the “English Garden” was deployed in the later twentieth century as a means to establish an “informal” Empire of memory. The result is an architectural irony and a landscape at odds with the moment that made it: the post-1945 cemeteries of the Imperial War Graves Commission (IWGC) expanded the now defunct Empire’s commemorative possessions just as the actual deeds to land were surrendered. The one exception to this story of contemporaneous political withdrawal and commemorative appropriation nonetheless proves the broader point. For after the bloody imperial war fought in the South Atlantic in 1982 the Commission, at the behest of the British government, built its first and last post-1945 overseas war cemetery. And just as had been the case sixty years earlier, the form and style of this cemetery ensured it became the last outpost of an Edwardian Empire of memory.


1857 ◽  
Vol 3 ◽  
pp. 294-295
Author(s):  
Robert Harkness

The author remarks that the existence of Annelida during the Palæozoic formations is manifested in two conditions. In the one, we have the shelly envelope which invests the order Tubicola, in the form of Seapolites; and in the other, the tracks of the orders Abranchia and Dorsi-branchiata are found impressed on deposits which were, at one time, in a sufficiently soft state to receive the impressions of the wanderings of these animals.Among the strata which have hitherto afforded annelid tracks, those which, in the county of Clare, represent a portion of the equivalents of the Millstone Grit, contain such tracks, in their most perfect state of preservation in great abundance; and these strata also furnish evidence concerning the circumstances which prevailed during their deposition.


2019 ◽  
Vol 36 (1) ◽  
pp. 25-50
Author(s):  
Haruo Kubozono

Abstract This paper examines the nature and behavior of secondary H(igh) tones in Koshikijima Japanese, a highly endangered dialect spoken on three small, remote islands in the south of Japan. This dialect generally has a mora-counting prosodic system with two distinctive accent types/classes (Type A and Type B), and displays two H tones, primary and secondary, in words of three or more moras: The primary H tone appears on the penultimate and final moras in Type A and Type B, respectively, whereas the secondary H tone occurs at the beginning of the word redundantly. Koshikijima Japanese displays regional variations with respect to the secondary H tone, particularly regarding its domain/position, its (in)dependence on the primary H tone, its interaction with the syllable, and its behavior in postlexical phonology. This paper examines how the secondary H tone behaves differently in three distinct accent systems of the dialect: (i) the system described by Takaji Kamimura eighty years ago, (ii) the one that is found quite extensively on the islands today, including Kamimura’s native village (Nakakoshiki) and Teuchi Village, and (iii) the system observed in Kuwanoura Village today. Comparing the three accent systems, this paper also proposes historical scenarios to account for the different behaviors of the secondary H tone across time and space.


2005 ◽  
Vol 32 (1) ◽  
pp. 159-163 ◽  
Author(s):  
Duan Wei

Beijing is located in a semiarid region, and water shortage is a common problem in the city. Along with the rapid increase in water demand, due to fast socioeconomic development and an increase in population, a shortage of water resources and a deterioration of the water environment have become obstacles to sustainable socioeconomic development in Beijing. In the long run, sustainable water resources management, water conservation, and completion of the south to north water diversion project will solve the problem. This paper introduces the water resources situation in Beijing; analyzes future water demand; and discusses the actions of water saving, nontraditional water resources exploitation, wetland construction, and water environment protection. The paper also explains the importance of the south to north water diversion project and the general layout of the water supply strategy, water distribution system, and methods to efficiently use the diverted water in Beijing.Key words: water resources, water supply, water saving, water recycling, water diversion.


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