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Topic: Lomonosov Ridge

	Lomonosov Ridge - Wikipedia, the free encyclopedia
		Lomonosov Ridge (Хребет Ломоносова in Russian) is an underwater oceanic ridge in the Arctic Ocean.
		Slopes of the ridge are relatively steep, broken up by canyons, and covered with layers of silt.
		The Lomonosov Ridge was first discovered by the Soviet high-latitude expeditions in 1948 and named after Mikhail Lomonosov.
	en.wikipedia.org /wiki/Lomonosov_Ridge (219 words)

	Mid-ocean ridge - Wikipedia, the free encyclopedia
		The mid-ocean ridges of the world are connected and form a single global mid-oceanic ridge system that is part of every ocean, making the mid-oceanic ridge system the longest mountain range in the world, with a total length of about 60,000 km.
		Mid-ocean ridges are geologically active, with new magma constantly emerging onto the ocean floor and into the crust at and near rifts along the ridge axes.
		Because a mid-ocean ridge is submerged at very deep depths in the ocean, its existence was not even known until the 1950s, when it was discovered through surveys of the ocean floor conducted by research ships.
	en.wikipedia.org /wiki/Mid-ocean_ridge (953 words)

	Science (Site not responding. Last check: 2007-10-08)
		Lomonosov ridge appears to be a narrow sliver of continental crust sliced off of the eurasian continental margin by the eastward propagation of Gakkel Ridge.
		Gakkel Ridge is the only actively spreading mid-ocean ridge in the Arctic basin, and is the northward continuation of the Mid-Atlantic ridge.
		The northernmost end of Knipovitch ridge ends at an unusual area composed of an extreme deep (Molloy Deep) and a ridge, which appears to be a small amagmatic spreading segment.
	www.mpch-mainz.mpg.de /~geo/Arctic/Cruise2001/science.html (1838 words)

	Morphology and structure of the Lomonosov Ridge, Arctic Ocean
		The Lomonosov Ridge is a band of continental crust that stretches across the Arctic Ocean and separates the Mesozoic Amerasian Basin from the Cenozoic Eurasian Basin.
		The outer ridge marks an abrupt boundary between the Lomonosov Ridge complex and the apparently oceanic crust of the Makarov Basin.
		The observed structure on the Amerasian Basin side of the Lomonosov Ridge is analogous to that observed at well-studied shear margins and supports rotational models for the development of the Amerasian Basin.
	www.agu.org /pubs/crossref/2006/2005GC001114.shtml (466 words)

	IPY: International Polar Year
		For example, if the ice grounding previously mapped down to 1-km present water depth on the central Lomonosov Ridge resulted from a much debated, but supposedly coherent and large floating ice shelf, the Lomonosov Ridge north of Greenland also must be scarred by such a major ice grounding event.
		A key to the tectonic evolution of the Arctic Basin, in particular pre-Gakkel Ridge spreading, is the nature and history of the Lomonosov Ridge.
		A significant advance in investigating new frontiers will be achieved by bathymetric and seismic mapping the virtually unexplored area of the Lomonosov Ridge north of Northern Greenland (Theme 4) and also by applying the AUV technology under the Arctic Ocean pack ice.
	www.ipy.org /development/eoi/details.php?id=696 (1307 words)

	A Workshop on the Amerasian Basin and Its Margins: Abstracts
		The Amerasian margin of the Lomonosov Ridge structure, much of which is buried beneath Makarov Basin sediments, falls very closely along a small circle about the Grantz et al pole for the rotational model for the development of the Amerasian Basin.
		When compared with Lomonosov Ridge sediments, the sedimentation rates of the Amundsen and Nansen Basins are higher, as a result of the dominance of turbidite deposition.
		Prior to opening of the Eurasia Basin and separation of the Lomonosov Ridge, continental Europe was adjacent to the Amerasia Basin.
	www.geo-prose.com /amerasian/abstracts.html (3611 words)

	Arctic Ocean - MSN Encarta
		The surface waters of the Arctic Ocean mingle with those of the Pacific Ocean through the Bering Strait, by way of a narrow and shallow channel, which has a depth of 55 m (180 ft).
		The Lomonosov Ridge, the major ridge, cuts the Arctic Basin almost in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland.
		Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, and the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins.
	encarta.msn.com /encyclopedia_761562552/Arctic_Ocean.html (445 words)

	Arctic Ocean - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-08)
		The floor of the Arctic Ocean is divided by three submarine ridges—Alpha Ridge, Lomonosov Ridge, and the Arctic Mid-Oceanic Ridge; other submarine ridges, such as the Faeroe-Icelandic Ridge, act to separate the Arctic Ocean from the Atlantic.
		Soviet polar scientists investigated (1948-49) the Lomonosov Ridge, an undersea mountain range that influences the pattern of ice drift and the circulation and exchange of water in the Arctic Ocean.
		Behavior of Arctic ocean ridge confounds predictions; May lead to new insights into crust foundation.
	www.encyclopedia.com /doc/1E1-arcticoc.html (1160 words)

	Proof that Peary reached the North Pole, Matthew Henson, Robert E. Peary, April 6, 1909
		This is a map of the ocean floor under the Arctic route Henson and Peary followed to the North Pole.
		The shallow depths (relatively shallow) on the other side of the ridge led everyone to think the entire Arctic Ocean was only a few thousand feet deep.
		That ridge is a perfect divider between a measurable ocean depth and a "bottomless" one.
	www.matthewhenson.com /dcpole3.htm (289 words)

	Drifting Ice Stations
		It is called the Mendeleyev Ridge (Alpha Rise by Americans) and stretches 932 miles from the vicinity of Wrangel Island toward Ellesmere Island, reaching within 4592 feet of the surface.
		As the station approached the area of the eruption (near the Lomonosov Ridge), the ice floe felt a series of strong shocks and cracked.
		North Pole-3 observed that the deep water on the Atlantic side of the Lomonosov Ridge was colder and less saline than water at the same depth on the Pacific side.
	www.airpower.maxwell.af.mil /airchronicles/aureview/1966/sep-oct/smith.html (5148 words)

	GEBCO (1979) and IBCAO (2000) maps, selective comparisons
		The Gakkel Ridge is a spreading ridge that separates the Nansen and Amundsen Basins.
		Measuring about 1700 km in length, the Lomonosov Ridge is considered to be of continental origin, a sliver that was separated from the Kara and Barents shelves and transported to its present position by sea-floor spreading (e.g., Sweeney et al., 1982; Kristoffersen, 1990).
		On the GEBCO map, the Lomonosov Ridge is a continuous feature that extends from the continental shelf off Ellesmere Island towards the North Pole, where it changes direction slightly and continues along the 140°E meridian to the continental shelf off the New Siberian Islands.
	www.ngdc.noaa.gov /mgg/bathymetry/arctic/ibcao_gebco_comp.html (1154 words)

	Print news - IPS Inter Press Service
		Ranging in width from 60 to 200 km, the Lomonosov Ridge rises 3,300 to 3,700 metres above the seabed, but the peaks are at least 1,000 metres underwater.
		Discovered in 1948 by Mikhail Lomonosov, a scientist from the former Soviet Union, Russia says the ridge is an extension of Siberia, and thus has territorial claims over a large part of the Arctic.
		But Canadian and Danish officials disagree, arguing that the ridge is a continuation of their landmasses.
	www.ipsnews.net /print.asp?idnews=32979 (842 words)

	On Large Scale Shifts in the Arctic Ocean and Sea Ice Conditions during 1979
		Waters from the Laptev shelf enter the Eurasian Basin in two areas: the southern end of the Lomonosov Ridge and along the continental slope to the north of the East Siberian Islands.
		The dominant fresh water transport along the Lomonosov Ridge is re-established, similarly to the regime described in Figure 3a.
		A preferred pathway for fresh water exit from the Siberian shelves is from the East Siberian Sea toward the Lomonosov Ridge and from the Kara and Laptev Seas northward into the Eurasian Basin.
	www.oc.nps.navy.mil /sbi/IGS_LargeScaleShift.htm (4435 words)

	Postcard #7
		Magnetic anomalies and the presence of the Arctic Mid-Ocean Ridge in the Eurasian Basin, the deep area between Europe and the Lomonosov Ridge, have already helped us decipher the age of this basin and the processes that created it.
		The structures on and beneath the ocean floor that we mapped during our visit to the Lomonosov Ridge are critical to understanding how the Earth’s tectonic plates moved in the past to create the Amerasian Basin.
		At the conclusion of the Lomonosov Ridge survey, it was a short trip to the North Pole.
	www.csp.navy.mil /scicex/card7.htm (752 words)

	Cavalla Cruise Report
		Additional observations included crossings of the Lomonosov Ridge front and a detailed mapping of the frontal system, nearly 200 km in breadth, that was associated with the Alpha-Mendeleyev Ridge.
		The purpose of the SCAMP survey was to investigate the geophysical structure of the Ridge that is part of the slowest ocean floor spreading center on earth.
		Trackline bathymetry shows the Gakkel ridge to have severe bathymetric changes typically in the 1,000-2,000 meter range with highs as shallow as 600m of water depth and deeper regions down to ~5,200m of water depth.
	www.ldeo.columbia.edu /res/pi/SCICEX/Pages/Cruise_Report.html (10189 words)

	LORITA-1
		Greenland (Denmark) is adjacent to Ellesmere Island (Canada), and both countries have the possibility of claiming the Lomonosov Ridge, a submarine mountain range, as a natural prolongation of their land territory (see map).
		In order to have sufficient information to make the case that the Lomonosov Ridge has a similar velocity structure as the polar margin, 11 shots per line need to be fired.
		The line along the Lomonosov Ridge is 400 km long, and will be acquired in two sections; the line crossing westwards is 200 km long and will be acquired in one section.
	a76.dk /expeditions_uk/lorita-1_uk/index.html (1011 words)

	Geology - James Madison University (Site not responding. Last check: 2007-10-08)
		IODP Expedition 302 on the Lomonosov ridge recently recovered the most continuous Cenozoic sediment record of the Arctic Ocean enabling unprecedented study of the Arctic's transition from a greenhouse to an icehouse world during the last 50 Myr.
		The source for these grains appears to be planktonic foraminifera which have settled from the overlying surface waters to the top of the Lomonosov ridge and gone through diagenetic mineral alteration.
		The western flank of the Blue Ridge Mountains in the central Shenandoah Valley is drained by numerous first and second order tributary streams that flow nearly perpendicular to the summit, and empty into the larger South and South Fork of the Shenandoah Rivers that flow along the valley floor.
	www.jmu.edu /geology/042806symposium.shtml (6514 words)

	ePIC: The Sedimentary Structure of the Lomonosov Ridge from the North Pole to Siberia
		Jokat, W. The Sedimentary Structure of the Lomonosov Ridge from the North Pole to Siberia
		During the early rift/drift phase the Lomonosov Ridge was formed and represents today the northern rim the Eurasia Basin.
		Some smaller elongated ridges in the Makarov Basin are likely to structurally belong to the Lomonosov Ridge.
	www.awi-bremerhaven.de /Publications/Jok2004f_abstract.html (288 words)

	Lomonosov Ridge - MSN Encarta (via CobWeb/3.1 planetlab2.tamu.edu) (Site not responding. Last check: 2007-10-08)
		Lomonosov Ridge - MSN Encarta (via CobWeb/3.1 planetlab2.tamu.edu)
		Lomonosov Ridge, undersea mountain ridge in the Arctic Ocean.
		The highest undersea ridge in the world, it divides the Norwegian Basin almost in half....
	uk.encarta.msn.com.cob-web.org:8888 /encyclopedia_631524391/Lomonosov_Ridge.html (50 words)

	SitNews - A fern grows in the Arctic Ocean By Ned Rozell
		From the depths of a long ridge spanning the floor of the Arctic Ocean, researchers have pulled up evidence of a plant that now grows in rice fields in Vietnam.
		Scientists drilled into a massive underwater ridge and retrieved a core loaded with information about the ancient Arctic Ocean, including evidence that it once was about as warm as the ocean off Florida.
		The Lomonosov Ridge is 1,100 miles long, about the distance from San Francisco to Denver, and rises about 10,000 feet from the floor of the Arctic Ocean.
	www.sitnews.us /1005news/102105/102105_ak_science.html (705 words)

	Modeling Climate Variability
		At all depths, the Atlantic dye distribution indicates a cyclonic circulation in the Eurasian basin, with a dye concentration maximum marking a slow northward jet along the Eurasian flank of the Lomonosov Ridge.
		Analysis of the velocity fields at Atlantic Layer depth reveals that the northward jets along the Lomonosov and Mendeleyev ridges are present both during the spinup and toward the end of experiment.
		Atlantic and freshwater dyes which, in the spinup, would exit the shelf and slope regions on the Eurasian side of the Lomonosov Ridge are advected over the ridge and spread northward mainly in the Makarov Basin.
	www.oc.nps.navy.mil /sbi/ModelingRecentClimateVariability.htm (2716 words)

	The Arctic Ocean Boundary Current
		Thus, the boundary current is split in two by the ridge, half continuing on into the Canadian Basin, and half being diverted north along the Lomonosov Ridge.
		This suggests that the Atlantic layer crosses the ridge at various latitudes south of 86.5°N and flows southward along the Canadian Basin side of the ridge.
		A cooling and freshening of the Atlantic layer is observed at all three moorings, both in the timeseries data and in CTD casts taken before and after the deployment (see left).
	psc.apl.washington.edu /HLD/Lomo/Lomonosov.html (1462 words)

	News and announcements from GEUS
		In the course of 6 weeks, seismic refraction, gravity and bathymetric data will be collected over the submarine Lomonosov Ridge that stretches from Ellesmere Island and Greenland out into the Arctic Ocean.
		The work forms part of the LORITA-1 project (Lomonosov Ridge Test of Appurtenance Expedition - Phase 1) that will investigate whether the submarine ridge is a natural prolongation of the Canada/Greenland land territory.
		The experiment that is planned is an underwater seismic survey running from a point just north of the NW corner of Greenland up over the Lomonosov Ridge.
	www.geus.dk /cgi-bin/webbasen_nyt_uk.pl?pagenum=5\|cgifunction=Vis (1300 words)

	Research - RTD info - Special issue - May 2005 - ACEX: The Arctic coring expedition
		The Lomonosov Ridge was selected as the best possible drilling site due to its eroded aspect and the absence of more recent, less interesting sediment deposit such as would be found on oceanic valley floors.
		According to the expedition’s co-chief investigator, Jan Backman of the University of Stockholm, initial analysis of the microfossils found in the core show evidence of massive fluctuations in the water temperature and general environmental conditions of the Arctic over the past 55 million years.
		The ACEX coring site on the Lomonosov Ridge crest, at 1124 metres down, is an optimum drilling site as erosion has exposed very old sediments.
	ec.europa.eu /research/rtdinfo/special_pol/06/article_2620_en.html (176 words)

	Ventilation and circulation of intermediate waters in the CanadianBasin observed on the SCICEX-96 cruise
		Evidence for cyclonic flow of intermediate water along the Lomonosov Ridge is found in the Oden 91 data (Rudels et al., 1994) and in data collected in 1993 from the US Navy submarine USS Pargo (Morison et al., 1998).
		The flow of intermediate water across the Lomonosov Ridge and along the East Siberian Sea slope is strongly supported by hydrographic and tracer distributions along the 1994 Arctic Ocean Section expedition (AOS 94) (Swift et al., 1997; Ekwurzel, 1998; Schlosser et al., 1997).
		Salinity increases from station 28 at the Lomonosov Ridge to station 35 at the northern end of the Canada Basin and then decreases from station 35 to station 38 located in the center of the Canada Basin.
	www.ldeo.columbia.edu /~etg/peter/scicex96/manu/index.html (9226 words)

	Proc. IODP, 302, Sedimentation and subsidence history of the Lomonosov Ridge (Site not responding. Last check: 2007-10-08)
		The ridge was rifted from the Eurasian continental margin at ~57 Ma (Fig.
		Since the rifting event and the concurrent tilting and erosion of this sliver of the outer continental margin, the Lomonosov Ridge subsided while hemipelagic and pelagic sediments were deposited above the angular rifting unconformity (see Fig.
		Eventually, the ridge subsided to its present water depth as it drifted from the Eurasian margin.
	www.ecord.org /exp/acex/vol302/105/105_.htm (261 words)

	IPY: International Polar Year
		In this context, a major break-through was the recent very successful IODP drilling campaign on Lomonosov Ridge (ACEX 2004).
		Detailed reconstructions of the long-term paleoenvironmental history from the Alpha-Mendeleev Ridge area representing the transition from Mesozoic-Early Tertiary Greenhouse conditions to upper Tertiary-Quaternary Icehouse conditions, however, are still needed.
		Of interest are areas of high sedimentation rates for the high-resolution studies of late Quaternary (postglacial-Holocene) paleoenvironment and areas where older strata are cropping-out (for studying Mesozoic/Cenozoic sequences of paleoenvironmental change).
	www.ipy.org /development/eoi/details.php?id=1011 (1120 words)

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