scholarly journals The Surface Velocity of The Yakataga Glacier Alaska

1957 ◽  
Vol 3 (22) ◽  
pp. 125-130 ◽  
Author(s):  
Don J. Miller
Keyword(s):  
Average Rate ◽  
Gulf Of Alaska ◽  
Rock Fall ◽  
Aerial Photographs ◽  
Surface Velocity ◽  
North Coast ◽  
Time Interval ◽  
Main Trunk ◽  
The North ◽  
Photogrammetric Measurement

AbstractThe Yakataga Glacier occupies a steep-walled valley in the Robinson Mountains on the north coast of the Gulf of Alaska. The main trunk of the glacier descends from 1130 to 150 m. in a distance of 21 km. A rock fall at the head of the glacier formed a moraine of distinctive shape which advanced at an average rate of 114 m./yr. from 1938 to 1954. The surface velocity of the glacier at fifteen stations below the firn line was calculated from the displacement of the rock-fall moraine and other less conspicuous features that are shown in two sets of vertical aerial photographs, taken in 1948 and 1954. For this time interval the average surface velocity along the medial line of the glacier ranged from a maximum of about 90 m./yr. at a station 14 km. above the terminus to zero at a station 2.3 km. above the terminus. The technique of photogrammetric measurement of surface velocity by using natural features on the surface of a glacier has wide application in Alaska, where many glaciers have been rephotographed from the air after intervals of a few years to as many as thirty years.

scholarly journals The Surface Velocity of The Yakataga Glacier Alaska

1957 ◽  
Vol 3 (22) ◽  
pp. 125-130 ◽  
Author(s):  
Don J. Miller
Keyword(s):  
Average Rate ◽  
Gulf Of Alaska ◽  
Rock Fall ◽  
Aerial Photographs ◽  
Surface Velocity ◽  
North Coast ◽  
Time Interval ◽  
Main Trunk ◽  
The North ◽  
Photogrammetric Measurement

Abstract The Yakataga Glacier occupies a steep-walled valley in the Robinson Mountains on the north coast of the Gulf of Alaska. The main trunk of the glacier descends from 1130 to 150 m. in a distance of 21 km. A rock fall at the head of the glacier formed a moraine of distinctive shape which advanced at an average rate of 114 m./yr. from 1938 to 1954. The surface velocity of the glacier at fifteen stations below the firn line was calculated from the displacement of the rock-fall moraine and other less conspicuous features that are shown in two sets of vertical aerial photographs, taken in 1948 and 1954. For this time interval the average surface velocity along the medial line of the glacier ranged from a maximum of about 90 m./yr. at a station 14 km. above the terminus to zero at a station 2.3 km. above the terminus. The technique of photogrammetric measurement of surface velocity by using natural features on the surface of a glacier has wide application in Alaska, where many glaciers have been rephotographed from the air after intervals of a few years to as many as thirty years.

scholarly journals Quaternary radiolarian biostratigraphy in the subarctic northeastern Pacific (IODP Expedition 341 Site U1417) and synchroneity of bioevents across the North Pacific

2018 ◽  
Vol 37 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Kenji M. Matsuzaki ◽  
Noritoshi Suzuki
Keyword(s):  
North Pacific ◽  
Sediment Cores ◽  
Gulf Of Alaska ◽  
Northwestern Pacific ◽  
Time Interval ◽  
The North ◽  
Integrated Ocean Drilling Program ◽  
Northeastern Pacific ◽  
Radiolarian Biostratigraphy ◽  
The North Pacific

Abstract. Expedition 341 of the Integrated Ocean Drilling Program (IODP) retrieved sediment cores spanning the time interval between the Pleistocene and Miocene from the southern Gulf of Alaska. Onboard Pleistocene radiolarian biostratigraphy is hereby refined by increasing the sampling resolution. The 178 core samples from the upper 190 m CCSF-B (Composite Core Depth Scale F-B) of Site U1417 contained faunal elements similar to the northwestern Pacific; for example, the three biozones in the northwestern Pacific (i.e., Eucyrtidium matuyamai, Stylatractus universus and Botryostrobus aquilonaris) were also recognized in the Gulf of Alaska, spanning 1.80–1.13 Ma, 1.13–0.45 Ma, and the last 0.45 Myr, respectively. Based on the age model that we used in this study and the shipboard paleomagnetic reversal events, the first occurrences (FOs) of Amphimelissa setosa and Schizodiscus japonicus in the northeastern Pacific were preliminarily determined to be 1.48 and 1.30 Ma, respectively. The last occurrence (LO) of Eucyrtidium matuyamai and the FO of Lychnocanoma sakaii, both well-established bioevents in the northwestern Pacific, were dated at 0.80 and 1.13 Ma, respectively. The LO of E. matuyamai is a synchronous event at 1.05 ± 0.1 Ma in the North Pacific, while the FOs of A. setosa and S. japonicus at 1.48 and 1.30 Ma, respectively, are significantly older than what has been found elsewhere.

scholarly journals Sources of Eddy Energy Simulated by a Model of the Northeast Pacific Ocean

2008 ◽  
Vol 38 (10) ◽  
pp. 2283-2293 ◽  
Author(s):  
Jennifer Shore ◽  
Michael W. Stacey ◽  
Daniel G. Wright
Keyword(s):  
Pacific Ocean ◽  
Spatial Scales ◽  
Gulf Of Alaska ◽  
North Coast ◽  
Mean Flow ◽  
Spectral Nudging ◽  
The North ◽  
The Mean ◽  
Eddy Field ◽  
Mean State

Abstract This paper examines the energy sources for eddy variability in the Gulf of Alaska using a numerical model and a novel form of data assimilation referred to as spectral nudging. Spectral nudging is distinguished from conventional nudging by its ability to operate only on specified frequency and wavenumber bands; in the present case, only the subannual variability is nudged, and only on spatial scales of 100 km or more. By using this approach, the broad-brush aspects of the model’s mean state are constrained to remain near the mean climatological conditions, while the simulated eddy field is determined by the model dynamics. Simulations of the North Pacific Ocean with a 0.25° horizontal resolution and spectral nudging have been previously shown to produce eddy fields that are significantly more energetic and more realistic than those produced by prognostic (i.e., not nudged) simulations. The analysis of the spectrally nudged model results undertaken here reveals the tendency of the circulation to be both baroclinically and barotropically unstable in different regions and to differing degrees. Along the north coast of the Gulf of Alaska, the simulation suggests that barotropic instability is more important overall as an energy source for eddies than is baroclinic instability. Along the east coast of the Gulf of Alaska, the simulation suggests that both baroclinic and barotropic instabilities are important. Although the overall energy transfer is from the mean state to the eddy field, there are regions of the model, particularly along the north coast of the Gulf of Alaska, where the transfer of energy is from the eddy field to the mean flow.

scholarly journals ANALYSIS OF DEVELOPING RAW MATERIALS IN NORTH KURIL ZONE OF FAR EASTERN FISHERIES IN 2010–2019

2021 ◽  
Vol 2021 (2) ◽  
pp. 7-19
Author(s):  
Svetlana Lisienko ◽  
Nina Ivanko
Keyword(s):  
Raw Materials ◽  
Average Rate ◽  
Sea Bass ◽  
Time Interval ◽  
Resource Potential ◽  
Rate Of Development ◽  
Object A ◽  
The North ◽  
High Degree ◽  
Far Eastern

The article presents the analysis of the development of commercial objects in the North-Kuril zone of the Far Eastern fisheries basin for a ten-year period. The resource potential of this zone was found to consist of 11 objects for which the total allowable catches were established (TAC objects) and of 4 objects, the extraction of which is carried out within the recommended volumes (non-TAC objects). The main objects of production in the North-Kuril zone were pollock, Commander squid and terpug, the production volumes of each species, in the total catch of all objects, amounted to 48, 26 and 13%, respectively. The production volumes of the rest commercial objects amounted to a total of about 13%. An analysis of the dynamics of changes in the TACs was carried out for each test fishing object. A decrease of catch volumes in 2019, compared to 2010, was observed in three objects: terpugs, halibut and macrurus. For these objects during the period under review there was found a decrease in TAC volumes. Analysis of the development of the objects under study during the period 2010-2019 showed that crabs, scallops and pollock in the studied time interval had consistently high catch volumes and a high degree of development. The average rate of development of these objects was about 90% or more. The remaining 8 fishing objects were under-developed annually. The average degree of development of Far Eastern flounder, Commander squid, terpug, cod, sea bass was about 55-75%. The lowest average rate of development (less than 50%) was observed in halibut, pinchback and macrurus. It has been inferred that it is necessary to conduct further studies of fishing activities to develop the resource potential for subsequent modeling and optimization of fishing processes

87 million years of recorded history in Labrador: Birth, life, and sleep of the Kiglapait Intrusion

2020 ◽  
Vol 58 (4) ◽  
pp. 461-475
Author(s):  
Stearns A. Morse ◽  
John B. Brady ◽  
Deborah CASE Banks
Keyword(s):  
Bulk Composition ◽  
North Coast ◽  
Time Interval ◽  
Lower Zone ◽  
Metasedimentary Rocks ◽  
The North ◽  
Piston Cylinder ◽  
Pass Through ◽  
Magmatic History ◽  
In Transit

ABSTRACT The Kiglapait Intrusion on the north coast of Labrador is a bowl-shaped body dominated by troctolite about 3500 km3 in initial volume and was created during an intrusive event perhaps lasting thousands of years. It was emplaced into anorthosite and metasedimentary rocks at an estimated roof depth of 9.6 km and a magma depth of 8.4 km; hence with a floor at 18 km depth. The primary magma for the intrusion is thought to have been of harzburgite composition; a large volume of olivine crystallized in transit, to the extent that the magma became saturated with plagioclase by the time it reached the site of emplacement or soon after. To test this hypothesis, piston-cylinder experiments were made at 5–15 kbar in graphite using the Kiglapait Intrusion bulk composition with Fo-rich olivine added. Results at 13 kbar yielded saturation with garnet, olivine, spinel, orthopyroxene, clinopyroxene, plagioclase, and melt. This assemblage is compatible with a lherzolite solidus at 1375 °C. A postulated harzburgite solidus at 15 kbar would be hotter, perhaps 1410 °C. Partial melt from this harzburgite rising into a hot, thinned lithosphere is presumed to have shed large amounts of olivine to produce the plagioclase-saturated troctolitic basal Lower Zone of the intrusion. Conditions of emplacement are schematically developed in ternary Al–Ca–Fe diagrams. Some high-pressure experimental compositions of clino- and orthopyroxene are metastably enriched in Al but do not affect the interpretation of the magmatic history. We show that olivine fractionation will pass through the compositions of these aluminous minerals to reach a relatively evolved saturation with only plagioclase and olivine, resulting in the voluminous Lower Zone of troctolite. The amount of olivine crystallized to reach this result is calculated, using multiphase Rayleigh fractionation and a standard MELTS routine, to between 30% and 50%. Previously published argon-argon mineral dates on hornblende, biotite, and feldspars have captured a cooling history from ∼1258 °C to the ambient ∼100 °C over the time interval 1307 to 1220 Ma, hence the 87 million year history claimed in the title.

scholarly journals The reactions of shoaling adult cod to a pelagic trawl: implications for commercial trawling

2012 ◽  
Vol 69 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Shale Rosen ◽  
Arill Engås ◽  
Anders Fernö ◽  
Terje Jörgensen
Keyword(s):  
Fuel Economy ◽  
Packing Density ◽  
Atlantic Cod ◽  
Average Rate ◽  
Lower Half ◽  
North Coast ◽  
Marine Science ◽  
Improve Fuel Economy ◽  
The North ◽  
Commercial Harvest

Abstract Rosen, S., Engås, A., Fernö, A., and Jörgensen, T. 2012. The reactions of shoaling adult cod to a pelagic trawl: implications for commercial trawling. – ICES Journal of Marine Science, 69: 303–312. The reactions of shoaling adult Atlantic cod to a pelagic trawl were measured during fishing off the north coast of Norway. Cod remaining in the trawl track dived at rates as fast as 0.35 m s−1 following vessel passage and swam away from the vessel, in the direction of the approaching trawl, at an average rate of 0.6 m s−1. They did not attempt to swim ahead of the trawl as documented previously, but passed into the lower half of the trawl entrance and swam slowly in the direction of trawling at a rate of 0.2–0.5 m s−1 as the trawl's greater speed through water carried them deeper into the trawl. Shoals compressed vertically once inside the trawl, suggesting that packing density increased at least fourfold. Fish remained in the lower part of the trawl as they moved through its tapered section towards the codend, with little to no clearance above the bottom panel, but significant clearance beneath the top panel. Catches were sufficient to support commercial harvest, and the behaviour observed suggests that changes in trawl design and fishing strategy might improve fuel economy and species selectivity.

MBAH HENDRO KUSUMO BIN SYECH AHMAD MUTAMAKKIN: JEJAK SYIAR ISLAM DI WILAYAH PATI

EMPIRISMA ◽  
2008 ◽  
Vol 27 (2) ◽  
Author(s):  
Fathimatuz Zahra Dan Abdul Azis
Keyword(s):  
Central Region ◽  
Marital Relationship ◽  
Southern Region ◽  
North Coast ◽  
The North ◽  
Trace Back ◽  
Northern Regions ◽  
The One

Pati is a region on the north coast, according to the hypothesis of the researcher, the region is divided into three categories. The northern regions are more religious, the central is more plural, while the southern region is in the middle. In the central region there are many relics of tombs believed to be the those of the Muslim proselytizers in the area of Pati. The one that attracts the researcher is a tomb in the Gambiran area, where there are five local Muslim saints buried, one of them belons to mbah Hendro Kusumo, the son of Syech Ahmad Mutamakkin. This article attempts to trace back the spreading of Islam in Pati based on the existence of thetomb of Mbah Hendro Kusumo. It wants to answer question of whethere the existence of his tomb is due to his studying there or marital relationship, and how it relates to the spreading of Islam.Keywords: Mbah Hendro Kusumo, Traces of Islamic Dakwah, Islam

4 The Tyara Site

1968 ◽  
Vol 22 ◽  
pp. 44-79 ◽  
Author(s):  
William E. Taylor
Keyword(s):  
Sandy Beach ◽  
North Coast ◽  
National Museum ◽  
The West ◽  
Rock Outcrops ◽  
Small Boat ◽  
The North

The Tyara site, KkFb-7 in the National Museum catalogue and site file, faces the north coast of the Ungava mainland and rests on the west shore of Sugluk Island (Fig. 1). That island stands about five hundred yards from the mainland and from Sugluk Inlet, one of the few good harbors on that coast. This handsome little island, about one and one-half miles long and as wide, consists of rounded, rugged, hardrock hills that shelter well-vegetated, generally flat-floored valleys. The valleys often contain marshy patches. The shore, of variable incline, is quite jagged, a result of abrupt rock outcrops projecting seaward from brief stretches of sandy beach. The shore facing the mainland is, therefore, quite convenient for small boat use. Dark grey gneisses seem to predominate, although they are often cut by dykes and veins of lighter material, notably quartz. The dense, green valley and hillside vegetation includes willows, mosses, grasses, lichens, and a pleasant profusion of arctic wild flowers (Polunin 1948, Pt. III). I was told at Sugluk that at the head of the inlet, willows, growing in protected situations, reach the thickness of a man's wrist.

Sign in / Sign up

Export Citation Format

Share Document