Atlantic Winds and Ocean Currents in Portuguese Nautical Documents of the Sixteenth Century

1972 ◽  
Vol 73 ◽  
pp. 59-67 ◽  
Author(s):  
A. Teixeira da Mota
Keyword(s):  
Sixteenth Century ◽  
Fifteenth Century ◽  
North Atlantic ◽  
Trade Winds ◽  
Wind Variability ◽  
North East ◽  
The North ◽  
Physical Phenomena ◽  
First Time ◽  
Current Systems

SynopsisThe idea that only after 1490 the European sailors had ‘come for the first time in recorded history to struggle with the limitations placed on sailing ships by the winds and currents of the open ocean’ does not correspond to reality. There is enough proof to show that much earlier, in the fifteenth century, the North-East Trades’ regularity, the wind variability in the zone directly north of them, and the Canaries Current were already known. When the fifteenth century ended, the Portuguese had already verified the symmetry of wind patterns in the Atlantic on both sides of the equatorial calm zone, which led them to apply the significant name of ‘ventos gerais’ to the trade winds of both hemispheres.Accurate knowledge of the wind and current systems was essential to good navigation and the Portuguese ratters of the sixteenth century, chiefly ‘carreira da India’ rutters, include an increasing amount of information on that subject, referring especially to zones in the passage from the North Atlantic to the South Atlantic. The report of a voyage (1503) proves that at that time the Portuguese already knew the Gulf of Guinea winds and currents sufficiently well. As a result of oceanic sailing, the traditional ratters, exclusively coastal, developed considerably, not only by adding data about latitudes and compass variations but also by the indication of winds and currents. There appeared also an even newer type of ratter, the ‘oceanic rutter‘, in which the safest and quickest routes, because of the changeability of winds and current patterns, are indicated.Information about elements concerning winds and currents which are included in the Portuguese ratters was revealed in printed matter after the end of the sixteenth century and this allowed some European scientists to study, because of the availability of better information, the causes of those physical phenomena, which had already been treated briefly in the sixteenth century by two nautical treatise writers, D. João de Castro and Father Fernando Oliveira.

scholarly journals Bremen’s trade with the North Atlantic, c. 1400–1700

AmS-Skrifter ◽  
2020 ◽  
pp. 53-61
Author(s):  
Adolf E. Hofmeister
Keyword(s):  
Sixteenth Century ◽  
Fifteenth Century ◽  
North Atlantic ◽  
Ninth Century ◽  
The North ◽  
Trading Posts ◽  
Island Communities ◽  
The North Atlantic ◽  
The Baltic ◽  
Insight Into

There is little evidence of Bremen merchants in Norway before the royal charters issued from 1279 onwards, even though Bremen had been the seat of the missionary archbishop for the Nordic countries since the ninth century. Trade in Bergen in the fourteenth and fifteenth centuries was dominated by the Hanseatic cities of the Baltic Sea coast led by merchants from Lübeck. Despite opposition from Hanseatic merchants sailing to Bergen, merchants from Hamburg and Bremen developed new trading posts to barter cod on Iceland and Shetland in the fifteenth century. Traders from Hamburg and Bremen on Iceland competed for licences issued by the Danish king. The 1558 debt register of a merchant from Bremen in Kumbaravogur provides considerable insight into this trade. The Danish king restricted sailings to Iceland to Danish merchants from 1601. On Shetland the Scottish foud allotted landing places to foreign skippers and traders. Merchants from Bremen became respected members of the island communities and in the seventeenth century they changed to trading in herring. Several tariff rate rises led to the end of Bremen sailings to Shetland by the beginning of the eighteenth century. Bremen merchants in Norway succeeded in breaking the Lübeck dominance in Bergen in the sixteenth century. By 1600, other Norwegian harbours in the North Atlantic, notably Stavanger, were also destinations for ships from Bremen.

YUKAGIR GEOGRAPHICAL TERMS IN TOPONYMY OF THE KOLYMA RIVER BASIN

2020 ◽  
Vol 9 (4(73)) ◽  
pp. 29-33
Author(s):  
N.S. Bagdaryyn
Keyword(s):  
River Basin ◽  
Semantic Analysis ◽  
Comparative Method ◽  
Linguistic Analysis ◽  
Word Formation ◽  
Morphological Features ◽  
North East ◽  
The North ◽  
First Time ◽  
Kolyma River

The article continues the author's research on the toponymy of the North-East of the Sakha Republic, in particular the Kolyma river basin, in the aspect of the interaction of related and unrelated languages. The relevance of this work is defined in the description of local geographical terminology of Yukagir origin, as a valuable and important material in the further study of toponymy of the region. For the first time, the toponymy of the Kolyma river basin becomes the object of sampling and linguistic analysis of toponyms with local geographical terms of Yukagir origin in order to identify and analyze them linguistically. The research was carried out by comparative method, word formation, structural, lexical and semantic analysis. As a result of the research, phonetic and morphological features are revealed, the formation of local geographical terms and geographical names of Yukagir origin is outlined, and previously unrecorded semantic shifts and dialectisms are revealed. The most active in the formation of terms and toponyms is the geographical term iилil / eҕal 'coast‘, which is justified by the representation of the Yukagirs’ coast' home, housing

Literary Conduits for ‘Consent’

2016 ◽  
Vol 19 (2) ◽  
pp. 322-350 ◽  
Author(s):  
Pankaj Kumar Jha
Keyword(s):  
Sixteenth Century ◽  
Fifteenth Century ◽  
North India ◽  
Indian Society ◽  
Historical Process ◽  
The North ◽  
Literary Cultures

The making of the imperial subjects is as much a matter of historical process as the emergence of the empire. In the case of the Mughal state, this process started much before its actual establishment in the sixteenth century. The fifteenth century in North India was a period of unusual cultural ferment. The emergence of the Mughal imperial formation in the next century was intimately related to the fast congealing tendency of the north Indian society towards greater disciplining of itself. This tendency is evident in the multilingual literary cultures and diverse knowledge formations of the long fifteenth century.

Clerical Poverty in Early Sixteenth-Century England: Some East Anglian Evidence

1986 ◽  
Vol 37 (3) ◽  
pp. 389-396 ◽  
Author(s):  
John Pound
Keyword(s):  
Sixteenth Century ◽  
Social Status ◽  
Fifteenth Century ◽  
Average Salary ◽  
The North ◽  
High Social Status

The economic standing of the English parochial clergy in the early sixteenth century has been re-examined recently by Michael Zell, and the evidence at his disposal suggests that many of them were poverty-stricken in the extreme. He points to the large surplus of unendowed curates, chaplains and the like, and to the fact that when employment was available it was neither rewarding, in a monetary sense, nor necessarily secure. Stipends were officially regulated by an early fifteenth-century statute which set a maximum of £5 6s. 8d. per annum, and ‘evidence from all regions of England indicates that very rarely were curates and chaplains given more than that’. It was not uncommon for areas in the north to pay even less than this. In Lancashire, for example, the average salary of about 100 curates and chaplains in 1524 was £2 9s. 6d. In the East Riding of Yorkshire a year later it was £4. On the basis of such evidence, Mr Zell reasonably concludes that the unbeneficed clergy must have found it very difficult to survive, and that ‘the average country priest could not have been a person of high social status’.

scholarly journals The seasonal cycle of δ<sup>3</sup>C<sub>DIC</sub> in the North Atlantic subpolar gyre

2014 ◽  
Vol 11 (6) ◽  
pp. 1683-1692 ◽  
Author(s):  
V. Racapé ◽  
N. Metzl ◽  
C. Pierre ◽  
G. Reverdin ◽  
P. D. Quay ◽  
...  
Keyword(s):  
North Atlantic ◽  
Dissolved Inorganic Carbon ◽  
Ocean Dynamics ◽  
Subpolar Gyre ◽  
The North ◽  
Winter Convection ◽  
North Atlantic Subpolar Gyre ◽  
The North Atlantic ◽  
First Time ◽  
Negative Linear Relationship

Abstract. This study introduces for the first time the δ13CDIC seasonality in the North Atlantic subpolar gyre (NASPG) using δ13CDIC data obtained in 2005–2006 and 2010–2012 with dissolved inorganic carbon (DIC) and nutrient observations. On the seasonal scale, the NASPG is characterized by higher δ13CDIC values during summer than during winter, with a seasonal amplitude between 0.70 ± 0.10‰ (August 2010–March 2011) and 0.77 ± 0.07‰ (2005–2006). This is mainly attributed to photosynthetic activity in summer and to a deep remineralization process during winter convection, sometimes influenced by ocean dynamics and carbonate pumps. There is also a strong and negative linear relationship between δ13CDIC and DIC during all seasons. Winter data also showed a large decrease in δ13CDIC associated with an increase in DIC between 2006 and 2011–2012, but the observed time rates (−0.04‰ yr−1and +1.7 μmol kg−1 yr−1) are much larger than the expected anthropogenic signal.

A new species of amphipod, Megamphopus katagani sp. nov. (Crustacea: Peracarida: Photidae) from the Sea of Marmara (Turkey), with a key to the species of Megamphopus in the North Atlantic, Mediterranean and associated Seas

Zootaxa ◽  
2011 ◽  
Vol 2791 (1) ◽  
pp. 63 ◽  
Author(s):  
KEREM BAKIR ◽  
MURAT SEZGIN ◽  
ALAN A. MYERS
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Sea Of Marmara ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
The North Atlantic ◽  
A New Species

A new species of amphipod, Megamphopus katagani sp. nov., is described from the sea of Marmara (Turkey). A key to the species of Megamphopus known from the North-East Atlantic, Mediterranean and associated seas is provided.

Three new species of Ophryotrocha (Annelida: Dorvilleidae) from a whale-fall in the North-East Atlantic

Zootaxa ◽  
2009 ◽  
Vol 2228 (1) ◽  
pp. 43-56 ◽  
Author(s):  
HELENA WIKLUND ◽  
ADRIAN G. GLOVER ◽  
THOMAS G. DAHLGREN
Keyword(s):  
Phylogenetic Analyses ◽  
Nuclear Gene ◽  
Close Relative ◽  
North East ◽  
The North ◽  
Organic Carbon Flux ◽  
Naturally Occurring ◽  
Three New Species ◽  
First Time ◽  
Complex Organic

Three new Ophryotrocha species are described from sites with high levels of organic carbon flux including a whale-fall at 125 m depth off the Swedish coast and sediment sampled at 104 m depth beneath a fish farm in a Norwegian fjord. Phylogenetic analyses based on the nuclear gene H3 and the mitochondrial genes COI and 16S using MrBayes and Maximum Likelihood analyses show that Ophryotrocha eutrophila sp. nov. is a close relative to Ophryotrocha puerilis, while Ophryotrocha craigsmithi sp. nov. falls together with Palpiphitime lobifera, and Ophryotrocha scutellus sp. nov. occur within the 'hartmanni' clade. The genus Ophryotrocha is in our study monophyletic only if the genera Iphitime and Palpiphitime are included. Two representatives of Ophryotrocha previously described from anthropogenically-enriched sediments are here reported for the first time in very high abundance from a naturally occurring habitat. We suggest that whale falls are important habitats for the evolution of ecosystem services such as the degradation of complex organic compounds.

scholarly journals ATOP THE KADMEIA: MYCENAEAN ROOF TILES FROM THEBES IN CONTEXT

2020 ◽  
Vol 115 ◽  
pp. 175-245
Author(s):  
Vassilis L. Aravantinos ◽  
Ioannis Fappas ◽  
Yannis Galanakis
Keyword(s):  
Bronze Age ◽  
Fourteenth Century ◽  
Systematic Study ◽  
Late Bronze Age ◽  
Similar Material ◽  
Widespread Distribution ◽  
The Past ◽  
North East ◽  
The North ◽  
First Time

Questions were raised in the past regarding the use of Mycenaean tiles as ‘roof tiles’ on the basis of the small numbers of them recovered in excavations and their overall scarcity in Mycenaean domestic contexts. The investigation of the Theodorou plot in 2008 in the southern part of the Kadmeia hill at Thebes yielded the single and, so far, largest known assemblage per square metre of Mycenaean tiles from a well-documented excavation. This material allows, for the first time convincingly, to identify the existence of a Mycenaean tiled roof. This paper presents the results of our work on the Theodorou tiles, placing emphasis on their construction, form and modes of production, offering the most systematic study of Mycenaean tiles to date. It also revisits contexts of discovery of similar material from excavations across Thebes. Popular as tiles might have been in Boeotia, and despite their spatially widespread attestation, their use in Aegean Late Bronze Age architecture appears, on the whole, irregular with central Greece and the north-east Peloponnese being the regions with the most sites known to have yielded such objects. Mycenaean roof tiles date mostly from the mid- and late fourteenth century bc to the twelfth century bc. A study of their construction, form, production and contexts suggests that their role, apart from adding extra insulation, might have been one of signposting certain buildings in the landscape. We also present the idea that Mycenaean tile-making was guided by a particular conventional knowledge which was largely influenced by ceramic-related technologies (pottery- and drain-making). While production of roof tiles might have been palace-instigated to begin with, it does not appear to have been strictly controlled. This approach to Mycenaean tile-making may also help explain their uneven (in terms of intensity of use) yet widespread distribution.

Tropical Air–Sea Interactions Accelerate the Recovery of the Atlantic Meridional Overturning Circulation after a Major Shutdown

2007 ◽  
Vol 20 (19) ◽  
pp. 4940-4956 ◽  
Author(s):  
Uta Krebs ◽  
A. Timmermann
Keyword(s):  
Ocean Circulation ◽  
North Atlantic ◽  
Atlantic Meridional Overturning Circulation ◽  
Meridional Overturning Circulation ◽  
Tropical Atlantic ◽  
Trade Winds ◽  
The North ◽  
Salinity Anomaly ◽  
Meridional Overturning ◽  
The North Atlantic

Abstract Using a coupled ocean–sea ice–atmosphere model of intermediate complexity, the authors study the influence of air–sea interactions on the stability of the Atlantic Meridional Overturning Circulation (AMOC). Mimicking glacial Heinrich events, a complete shutdown of the AMOC is triggered by the delivery of anomalous freshwater forcing to the northern North Atlantic. Analysis of fully and partially coupled freshwater perturbation experiments under glacial conditions shows that associated changes of the heat transport in the North Atlantic lead to a cooling north of the thermal equator and an associated strengthening of the northeasterly trade winds. Because of advection of cold air and an intensification of the trade winds, the intertropical convergence zone (ITCZ) is shifted southward. Changes of the accumulated precipitation lead to the generation of a positive salinity anomaly in the northern tropical Atlantic and a negative anomaly in the southern tropical Atlantic. During the shutdown phase of the AMOC, cross-equatorial oceanic surface flow is halted, preventing dilution of the positive salinity anomaly in the North Atlantic. Advected northward by the wind-driven ocean circulation, the positive salinity anomaly increases the upper-ocean density in the deep-water formation regions, thereby accelerating the recovery of the AMOC considerably. Partially coupled experiments that neglect tropical air–sea coupling reveal that the recovery time of the AMOC is almost twice as long as in the fully coupled case. The impact of a shutdown of the AMOC on the Indian and Pacific Oceans can be decomposed into atmospheric and oceanic contributions. Temperature anomalies in the Northern Hemisphere are largely controlled by atmospheric circulation anomalies, whereas those in the Southern Hemisphere are strongly determined by ocean dynamical changes and exhibit a time lag of several decades. An intensification of the Pacific meridional overturning cell in the northern North Pacific during the AMOC shutdown can be explained in terms of wind-driven ocean circulation changes acting in concert with global ocean adjustment processes.

scholarly journals Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

2018 ◽  
Vol 15 (7) ◽  
pp. 2075-2090 ◽  
Author(s):  
Maribel I. García-Ibáñez ◽  
Fiz F. Pérez ◽  
Pascale Lherminier ◽  
Patricia Zunino ◽  
Herlé Mercier ◽  
...  
Keyword(s):  
North Atlantic ◽  
Water Mass ◽  
Water Levels ◽  
Water Masses ◽  
Meridional Overturning Circulation ◽  
Labrador Sea ◽  
Intermediate Water ◽  
North East ◽  
The North ◽  
The North Atlantic

Abstract. We present the distribution of water masses along the GEOTRACES-GA01 section during the GEOVIDE cruise, which crossed the subpolar North Atlantic Ocean and the Labrador Sea in the summer of 2014. The water mass structure resulting from an extended optimum multiparameter (eOMP) analysis provides the framework for interpreting the observed distributions of trace elements and their isotopes. Central Waters and Subpolar Mode Waters (SPMW) dominated the upper part of the GEOTRACES-GA01 section. At intermediate depths, the dominant water mass was Labrador Sea Water, while the deep parts of the section were filled by Iceland–Scotland Overflow Water (ISOW) and North-East Atlantic Deep Water. We also evaluate the water mass volume transports across the 2014 OVIDE line (Portugal to Greenland section) by combining the water mass fractions resulting from the eOMP analysis with the absolute geostrophic velocity field estimated through a box inverse model. This allowed us to assess the relative contribution of each water mass to the transport across the section. Finally, we discuss the changes in the distribution and transport of water masses between the 2014 OVIDE line and the 2002–2010 mean state. At the upper and intermediate water levels, colder end-members of the water masses replaced the warmer ones in 2014 with respect to 2002–2010, in agreement with the long-term cooling of the North Atlantic Subpolar Gyre that started in the mid-2000s. Below 2000 dbar, ISOW increased its contribution in 2014 with respect to 2002–2010, with the increase being consistent with other estimates of ISOW transports along 58–59° N. We also observed an increase in SPMW in the East Greenland Irminger Current in 2014 with respect to 2002–2010, which supports the recent deep convection events in the Irminger Sea. From the assessment of the relative water mass contribution to the Atlantic Meridional Overturning Circulation (AMOC) across the OVIDE line, we conclude that the larger AMOC intensity in 2014 compared to the 2002–2010 mean was related to both the increase in the northward transport of Central Waters in the AMOC upper limb and to the increase in the southward flow of Irminger Basin SPMW and ISOW in the AMOC lower limb.

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