Physiographic subdivisions of the Chirikov Basin, northern Bering Sea

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U.S. Govt. Print. Off. , Washington
Submarine topography -- Chirikof Basin., Chirikof B


Chirikof B

Statementby D. M. Hopkins ... [et al.] ; prepared in cooperation with National Ocean Survey, National Oceanographic and Atmospheric Administration.
SeriesStudies on the marine geology of the Bering Sea, Geological Survey professional paper ; 759-B, Geological Survey professional paper ;, 759-B.
ContributionsHopkins, David Moody, 1921-, National Ocean Survey.
LC ClassificationsGC85.2.B47 P48
The Physical Object
Pagination7 p. :
ID Numbers
Open LibraryOL4895638M
LC Control Number76029239

PHYSIOGRAPHIC SUBDIVISIONS OF THE CHIRIKOV BASIN, NORTHERN BERING SEA B3 smooth offshore slopes diversified, in places, by relief features that result from active longshore sediment transport. The nearshore prograded areas generally range from km in width.

Prograded shorelines are charted off Point Spencer spit and Brevig Lagoon. PHYSIOGRAPHIC SUBDIVISIONS OF THE CHIRIKOV BASIN, NORTHERN BERING SEA B5 wide at the eastern margin of the Chukotka Trough. Individual hills are km long, km wide, and stand m above the intervening rather flat areas.

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The hill summits are mostly at depths of by: 3. BATHYMETRY The description of the bathymetry that follows is based upon and uses the physiographic subdivisions proposed by Hopkins, Nelson, Perry, and Alpha () for the Chirikov Basin area.

The water depth in the Chirikov Basin exceeds 50 min only a few places; in Norton Sound depths are generally less than 20m (fig. 2).Cited by: Hopkins, D. M., C. Nelson, R. Perry, and T. Alpha. Physiographic subdivisions of the Chirikov Basin, Northern Bering Sea (studies on the marine geology of the Bering Sea).

Geological Survey Professional Paper B. U.S. Government Printing Office. 7pp. 3 plates. These changes now observed on the shallow shelf of the northern Bering Sea should be expected to affect a much broader portion of the Pacific-influenced sector of the Arctic Ocean.

T he northern Bering Sea, despite its sea-sonal ice cover (Fig. 1A), supports some of the highest benthic faunal biomass densities in the world_s oceans (1, 2). Over Cited by: Bering Sea sea ice during winter – was the lowest ever recorded. Ecosystem effects of low ice have been observed in the southeastern Bering Sea, but never in the northern Bering Sea.

Observations in both systems included weakened water column stratification, delayed spring bloom, and low abundances of large crustacean zooplankton. 1. Introduction. The seasonally ice-covered Bering and Chukchi Sea shelves are among the largest continental shelves in the world.

Pacific water with high nutrient levels upwells onto the shelf of the northern Bering Sea and influences planktonic and benthic foodwebs as well as sediment community dynamics throughout this region.

The ocean circulation on the Bering and Chukchi sea shelves is investigated using a barotropic numerical model.

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In the presence of the winter seasonal wind stress from the northeast, observed northward transport through Bering Strait of Sv for the 8‐month winter season – can be driven by a sea level difference of m between the Pacific and Arctic oceans. The thermal state of the Bering Sea exhibits interdecadal variations, with distinct changes occurred in – After the unusual thermal condition of the Bering Sea in –, we found that the recent climate variability (–) in the Bering Sea is closely related to Pacific basin-scale atmospheric and oceanic circulation patterns.

Importance of Bering Strait. The Bering and Chukchi seas are linked by the narrow (85 km) and shallow (50 m) Bering Strait, through which the North Pacific communicates with the Arctic ().The net northward transport of Pacific waters through Bering Strait extensively affects Arctic sea ice (Aagaard et al., ; Paquette and Bourque, ; Shimada et al.,Woodgate et al., ), the.

Physiographic subdivisions of the Chirikov Basin, northern Bering Sea,Professional Paper B Late Quaternary vegetation history of the Yellowstone Lake basin. Introduction. Widespread change is anticipated for the Bering Sea (AK) under climate change, including substantial oceanographic warming that scales with future carbon mitigation scenarios (IPCC,).Climate-driven changes to oceanographic conditions have the potential to propagate through the food web and impact fish and fisheries in the region (Holsman et al., ).

based upon and uses the physiographic subdivisions proposed by Hopkins, Nelson, Perry, and Alpha () for the Chirikov Basin area. The water depth in the Chirikov Basin exceeds 50 m in only a few places; in Norton Sound depths are generally less than 20 m (fig.

An average depth for the entire region might be placed at 30 m. Because. The Bering Sea roughly resembles a triangle with its apex to the north and its base formed by the 1,mile-long arc of the Alaska Peninsula in the east; the Aleutian Islands, which constitute part of the U.S.

state of Alaska, in the south; and the Komandor (Commander) Islands in the area is aboutsquare miles (2, square kilometres), including its islands.

Understanding the origins of Bering Sea marginal basins (Aleutian, Bowers, and Komandorsky basins; AB, BB, KB) is key for reconstructing N. Pacific tectonic and magmatic evolution.

New acquisitions and recompilations of MCS, OBS, and potential field data (Barth et al. poster. this session) for USGS Extended Continental Shelf project and selection of Aleutians as GeoPrisms Subduction Cycles and. Abstract The Kurile Basin in the Okhotsk Sea, northwestern Pacific, is a back‐arc basin located behind the Kurile Island Arc.

It is underlain by oceanic crust and its origin has been attributed to back‐arc spreading. Two models for the opening of the Kurile Basin exist, for which the spreading axis is oriented northeast–southwest and northwest–southeast, respectively. Mediterranean Sea, an intercontinental sea that stretches from the Atlantic Ocean on the west to Asia on the east and separates Europe from Africa.

It has often been called the incubator of Western civilization. This ancient “sea between the lands” occupies a deep, elongated, and almost landlocked irregular depression lying between latitudes 30° and 46° N and longitudes 5°50′ W and Chirikov Basin north of Saint Lawrence Island in the northern Bering Sea was considered a prime gray whale feeding area, but an unusual mortality event in this species in – precipitated concern that this area no longer supported a viable benthic forage community.

In a provi. The Bering Sea is a rich marine ecosystem with U.S. landings of finfish and shellfish in excess of 2 × 10 6 tons. Recently, major declines of marine mammal and bird populations have occurred, with the question arising as to whether the causes were top down, i.e., from fishing pressure, or bottom‐up, i.e., driven by climate‐change effects.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Northern Bering and eastern Chukchi Sea physics, nutrients, and chlorophyll in late summer and. Abstract • Hydrography,!nutrients,!chlorophyll!a(Chla,!an. es6maon!of!phytoplankton!biomass),!were. On Dec. 9,President Barack Obama issued an executive order designating the globally significant U.S.

northern Bering Sea and Bering Strait region as the Northern Bering Sea Climate Resilience Area. Learn more about the communities and wildlife in this special place, the stresses and climate change impacts they face, and how strong leadership from regional tribes led to. Bengal Basin The Bengal Basin is one of the most extensive sediment reservoirs in the world and constitutes the lower floodplain and delta plain deposits of India and Bangladesh, at the mouth of the Ganga-Brahmaputra-Meghna River systems.

The. THE BERING SEA ECOSYSTEM: GEOLOGY, PHYSICS, CHEMISTRY, AND BIOLOGY OF LOWER TROPHIC LEVELS 57 Basin Few estimates have been made of primary production in the Bering Sea basin. New production is apparently only about 10 g C m-2 y-1 (Hansell et al., ), and total production is probably similar to the inner domain, or 50 to g C m-2 y-1 (e.g.

Great Basin physiographic section. The Great Basin physiographic section of the Basin and Range Province contains the Great Basin, but extends into eastern Oregon, southern Idaho, and the Colorado River watershed (including the Las Vegas metropolitan area and the northwest corner of Arizona).

The Basin and Range region is the product of geological forces stretching the earth's crust, creating. Northern Canada, colloquially the North, is the vast northernmost region of Canada variously defined by geography and cally, the term refers to three territories of Canada: Yukon, Northwest Territories, and rly, the Far North (when contrasted to the North) may refer to the Canadian Arctic: the portion of Canada that lies north of the Arctic Circle, east of Alaska.

The shelled benthic fauna of the northern Bering Sea has been extensively sampled and the taxonomy, distribution and functional role of species of mollusks, two species of barnacles, two species of echinoids and one species of brachiopod havet4pen examined: The major benthic communities were evaluated by cluster analysis.

They are: the Balanus rostratus alaskensis community which inhabits. A key ecological organizing principle for the northern Bering Sea and the adjoining southern Chukchi Sea just north of Bering Strait is that the shallow, seasonally productive waters lead to strong pelagic-benthic coupling to the sea floor, with deposition of fresh chlorophyll coinciding with the spring bloom as sea ice retreats.

Both in situ production and advection of upstream phytodetritus. The marine benthic fauna in Arctic shallow-water is reported to be a relatively young assemblage by species of either Pacific or Atlantic affinity. Whether current deep-sea Pacific species are included in the affinity or not is unknown.

Combining morphological comparisons and genetic analyses, a new deep-sea hydroid to science, Sertularia xuelongi sp. nov. (Cnidaria: Hydrozoa: Sertulariidae. In the case of an overlap, the northernmost border was selected.

The south‐eastern boundary of the research area was on the Navarin Cape latitude in the Bering Sea to the south of the Anadyr Bay and the Chirikov Basin as this is where the border between temperate Northern Pacific and Arctic realms lies (Spalding et al., ).

During the winter, the world population of spectacled eiders gathers at a single site south of St. Lawrence Island in the northern Bering Sea. During the summer, the species is divided into three breeding populations: western Alaska, northern Alaska, and northern Russia.

A majority (> .Wi nds over the eastern Bering Sea were generally from the northeast during March This is in accord with usual winter wind patterns (Brower et.!!., ). Under the influence of persistent northerly winds, ice formed in the shallow northern regions of the Bering Sea would be consistently.Aleutian Basin Bering Sea, Aleutian Basin: Responsibility: compiled by the National Ocean Service.

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