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Topic: Above sea level

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In the News (Fri 24 May 19)

  Sea level - Wikipedia, the free encyclopedia
In a state of rest or absence of external forces, the mean sea level would coincide with this geoid surface, being an equipotential surface of the Earth's gravity field.
The melting of glaciers at the end of ice ages is an example of eustatic sea level rise.
The subsidence of land due to the withdrawal of groundwater is an isostatic cause of relative sea level rise.
en.wikipedia.org /wiki/Sea_level   (944 words)

 Above mean sea level - Wikipedia, the free encyclopedia
The height above average terrain (HAAT) for a station is determined from topographic maps by averaging the elevation AMSL at points along several radials or radii.
It should be noted that the concept of a "mean sea level" is in itself rather artificial, because it is not possible to determine a figure for mean sea level for the entire planet, and it varies quite a lot even on a much smaller scale.
For example, the Ordnance Survey uses a height datum based on the mean sea level of a particular gauge at Newlyn, Cornwall for their maps of Great Britain, and this datum is actually some 80cm different from the mean sea level reading obtained on the other side of the country.
en.wikipedia.org /wiki/Above_mean_sea_level   (505 words)

 Articles - Sea level rise   (Site not responding. Last check: 2007-11-05)
Local “Mean sea level” (LMSL) is defined as the height of the sea with respect to a land benchmark, averaged over a period of time, such as a month or a year, long enough that fluctuations caused by waves and tides are largely removed.
The estimated rate of sea level rise from anthropogenic climate change from 1910 to 1990 (from modelling studies of thermal expansion, glaciers and ice sheets) ranges from 0.3 to 0.8 mm/yr.
A common perception is that the rate of sea level rise should have accelerated during the latter half of the 20th century.
www.free-biz.org /articles/Sea_level_rise   (4469 words)

 HA 730-N Hawaii Regional Summary text
Kauai is about 5,200 feet above sea level in its central part, but from the base of the mountains shoreward, large areas of the island are less than 1,000 feet above sea level in the southern, eastern, and northern parts.
The regional movement of fresh ground water is from interior areas toward the ocean, and all of the water discharges diffusely to the ocean or at springs near sea level.
Ground-water levels generally are highest in the winter months because of greater rainfall and reduced demand for ground water, and decline during the summer months when demand for ground water is greatest.
capp.water.usgs.gov /gwa/ch_n/N-HItext1.html   (7328 words)

 A Primer on glacio-eustatic sea levels
The hydrologic cycle is the constant circulation of water from the sea through the atmosphere, to the land, and its eventual return to the sea.
Because of glacial fluctuations true, or eustatic, sea level (which those of us who live along oceanic coasts may think of as a constant, ignoring waves, tides, and storms) varies across spans of observation ranging from decades to hundreds of thousands of years.
This variation, in turn, is superimposed on sea level fluctuations across millions of years caused by changes in the volume of the ocean basins.
www.homepage.montana.edu /~geol445/hyperglac/eustasy1   (554 words)

 PSMSL - Frequently Asked Questions
The sea level itself can change (sea level is believed to have increased by between 10 and 20 cm during the last 100 years) and land levels can change due to geological reasons.
Sea level is about 20 cm higher on the Pacific side than the Atlantic due to the water being less dense on average on the Pacific side and due to the prevailing weather and ocean conditions.
Global-average sea level is believed to have risen by between 10-20 cm during the past century and best estimates are that it will rise by approximately 50 cm in the next 100 years (i.e.
www.pol.ac.uk /psmsl/puscience   (2958 words)

 Maine Geology - Maine's History of Sea-Level Changes   (Site not responding. Last check: 2007-11-05)
In fact, many laypersons and scientists have asked: "Is the sea level changing, or is it the land that is moving?" That is a difficult question to answer completely, and is the subject of much ongoing research.
As sea level rise against a coast of tough, glacially smoothed rocks, erosion is very slow, and shoreline changes are primarily produced by gradual rising.
Depending on the rate of input of carbon dioxide, predicted sea levels range from a low of 0.5 m (1.6 ft) to a high of 3.5 m (11.5 ft!) above present by the year 2100.
www.state.me.us /doc/nrimc/pubedinf/factsht/marine/sealevel.htm   (1886 words)

 Tasmanian Sea Levels - Lessons from the Isle of the Dead   (Site not responding. Last check: 2007-11-05)
Fig.7 - A Timeline of Sea Level Relative to the Benchmark, 1841-2002, acc.
Since atmospheric pressure was 1024 mb on the day I did it, thus depressing sea level by nearly 10 cm, I subtracted that 10 cm from the 40 cm visual height to arrive at a figure of 30 cm for the adjusted height.
That means their sea level rise would have been swimming uphill against global cooling and rising land, a physical impossibility given the climatic circumstances and the available evidence.
john-daly.com /deadisle   (9818 words)

 High Altitude Cooking
At sea level, the atmosphere presses on a square inch of surface with a weight of 14.7 pounds, at 5,000 ft with 12.3 pounds, and at 10,000 feet with only 10.2 pounds- a decrease of about 1/2 pound per 1,000 feet.
Above 5,000 feet, temperatures obtained with a double boiler are not high enough for maximum gelatinization of starch.
Above that, decreased atmospheric pressure may result in excessive rising, which stretches the cell structure of the cake, making the texture coarse, or breaks the cells, causing the cake to fall.
www.coopext.colostate.edu /chaffee/highaltitude.html   (999 words)

 Sea Level Pressure   (Site not responding. Last check: 2007-11-05)
The pressure measured at each weather station is adjusted to the corresponding temperature at sea level in order to monitor properly horizontal changes in pressure.
For any site above sea level, this adjustment is performed by assuming that a column of air, with a particular temperature profile, exists between the stations elevation and sea level.
Using this temperature profile, the conversion to sea level pressure is calculated by increasing the station pressure by 10 millibars for every 100 m of elevation.
www.cimms.ou.edu /~cortinas/1014/l23_3.html   (128 words)

 Sea level
Mean sea level (MSL) at a given point is the average of that level when one has taken into account such things as tides and wave action.
Mean sea level at the Pacific end of the Panama Canal is 20cm higher than at the Atlantic end.
Over an extended period mean sea level will be affected by global warming in at least two ways: the run-off from melting glaciers on land, and the increased volume reflecting the coefficient of expansion of water.
news-server.org /s/se/sea_level.html   (348 words)

 Sea Level Data
Joint Archive for Sea Level (JASL) - The NODC and the University of Hawaii Sea Level Center (UHSLC) cooperate to provide access to sea level data.
The data are hourly, daily, and monthly sea level values from stations in tropical and subtropical areas of the Pacific, Atlantic, and Indian Oceans.
Customized datasets of sea level data can also be obtained by contacting NODC User Services.
www.nodc.noaa.gov /General/sealevel.html   (337 words)

 Sea Level Change Resources
Half of observed sea level rise in N. Sea is eustatic, and is result of melting ice (glacial eustatism), some is due to warming of water causing an increase in volume.
Rising sea levels tend to lead to renewed erosion, and cliffs which had been rendered inactive by falling levels are attacked again.
At the same time, global sea levels are rising and this rise is expected to accelerate significantly during this Century due to anthropogenic global warming.
www.geographypages.co.uk /sealevel.htm   (2288 words)

 Dead Sea (WebBible Encyclopedia) - ChristianAnswers.Net   (Site not responding. Last check: 2007-11-05)
34:12), the "sea of the plain" ( Deut.
But terraces of alluvial deposits in the deep valley of the Jordan show that formerly one great lake extended from the Waters of Merom to the foot of the watershed in the Arabah.
The waters were then about 1,400 feet above the present level of the Dead Sea, or slightly above that of the Mediterranean, and at that time were much less salt.
www.www.christiananswers.net /dictionary/deadsea.html   (446 words)

 How high is Mauna Loa above sea level?
Lieutenant James King, on Cook's 1779 voyage, first calculated the elevation as 16,020 feet (4883 m), based on vertical angles to its summit from sea level.
Level lines from Hilo to Volcano House run in 1912 and 1921 showed that the entire summit of Kilauea had increased in elevation by as much as 3 m (10 feet).
Uplift of Mauna Loa, determined by level surveys in its summit area from 1977 to 1981, was at least 13 cm (5 inches), and subsidence related to the 1984 eruption was at least 61 cm (2 feet).
hvo.wr.usgs.gov /volcanowatch/2001/01_08_23.html   (754 words)

 EPA : Global Warming : Resource Center : Publications : Sea Level Rise : Maps of Lands Vulnerable to Sea Level Rise
Understanding the broad-scale ramifications of accelerated sea level rise requires maps of the land that could be inundated or eroded.
In many cases, the results are as sensitive to uncertainty regarding geological processes as to the rate of sea level rise.
These results are arithmetic averages of the estimates for the loss of land from a 1-meter and a 2-meter rise in sea level, as reported by Titus and Greene (1989), Tables 4 and 5.
yosemite.epa.gov /OAR/globalwarming.nsf/content/ResourceCenterPublicationsSLRMapsIndex.html   (855 words)

They were formed at sea level and, even though eustatic sea level has risen, they have risen far more from isostasy.
The northern Baltic Sea is rising nearly one centimeter a year.
This causes regional and global sea level changes - reducing net eustatic sea level rise by increasing the volume of the ocean basins.
www.homepage.montana.edu /~geol445/hyperglac/isostasy1   (646 words)

 Abstracts of Recent Reports, Page 5   (Site not responding. Last check: 2007-11-05)
Ground-water levels reached nearly 30 feet below sea level in the Annapolis area, 113 feet below sea level southwest of Waldorf, and over 30 feet below sea level at the Chalk Point power plant.
The potentiometric surface was at least 103 feet above sea level near the northwestern boundary and outcrop area of the aquifer in a topographically high area of Prince George's County, and at least 87 feet above sea level in a similar setting in Anne Arundel County.
The map of the potentiometric surface of the lower Patapsco aquifer (Cretaceous Patapsco Formation) in southern Maryland during September 1995, shows that the potentiometric surface was 87 feet above sea level near the northwestern boundary and outcrop area of the aquifer in a topographically high area of Anne Arundel County.
nt1.versar.com /pprp/abstracts/page5.htm   (839 words)

 RecipeSource: Determining Your Altitude Above Sea Level
Since the boiling temperature of liquid is lower at higher elevations, it is critical that additional time be given for the safe processing of foods at altitudes above sea level.
For example, the State of Kansas has areas with altitudes varying between 75 ft. to 4,039 ft. above sea level.
Kansas is not generally thought to have high altitudes, but there are many areas of the State where adjustments for altitude must be considered.
www.recipesource.com /misc/canning/altitude-sea-level1.html   (278 words)

 Sea level - Enpsychlopedia   (Site not responding. Last check: 2007-11-05)
Defining the reference level [1] ( http://www.pol.ac.uk/psmsl/puscience/index.html#1), however, involves complex measurement, and accurately determining MSL can prove difficult.
Traditionally, one had to process sea-level measurements to take into account the effect of the 228-month Metonic cycle and the 223-month Saros cycle on the tides.
More detail about the changes in sea level for the past 140,000 years can be seen by accessing this chart ( http://www.grida.no/climate/ipcc_tar/wg1/fig11-4.htm).
www.grohol.com /wiki/Sea_level   (1037 words)

 Kenya and Beyond Safaris   (Site not responding. Last check: 2007-11-05)
Proceed at the mid night to Uhuru peak(summit) 5,896m above sea level.
The landscape becomes rigged and rocky but superb,with both mawenzi and kibo peaks in view.you spend your second night at the mountain at Horombo hut.an altitude of 3,761m [12.335ft].
The final attempt to the summit is made in the early hours of the morning at 2.oo a.m.
www.kenyaandbeyondsafaris.com /docs/tzkilimanjaro.htm   (564 words)

 INCN > Earth & Environment   (Site not responding. Last check: 2007-11-05)
The upper limit of the active beach is the swash line reached by highest sea level during big storms.
Inner Mongolia is essentially an inland plateau with a flat surface lying at an elevation of about 3,300 feet (1,000 metres) above sea level and fringed by mountains and valleys.
In the centre and the north, rainfall and snow are absorbed by the desert.
www.worldskills.com.au /simon/features/earth_and_environment.html   (1188 words)

 Sea level   (Site not responding. Last check: 2007-11-05)
Mean sea level at a given point is the average of that level when one has taken into account such things as tides and wave action.
Mean sea level at the Pacific end of the Panama Canal is 20 cm higher than at the Atlantic end.
Yves has let fall his silver whistle in the ocean, the whistle so day long, followed by Chrysantheme and Mesdemoiselles La Neige and La all, very difficult to explain in Japanese what is a sailor 's whistle of modulate the trills and the various sounds of official orders.
www.freetemplate.ws /se/sea-level.html   (615 words)

 NATURE'S BENEFIT HALSTEAD CORAL MIN CAPS90   (Site not responding. Last check: 2007-11-05)
While it is true that the above sea level coral calcium contains lower levels of magnesium than below sea level coral calcium, Dr. Halstead believes high levels of magnesium are not required in coral calcium.
He believes that ideal levels of magnesium may be much lower than the levels currently found in most below sea level coral calcium.
Mining coral calcium from above sea level also avoids the potential of heavy metal contamination that is associated with any product that comes from the ocean and sea bed.
www.smartbomb.com /smartbomb/036733007115.html   (585 words)

 A FeW CENTIMETER ABOVE sEA LEVEL   (Site not responding. Last check: 2007-11-05)
The bottles floated in a tub full of water, which was placed under them.The surface of the water inside the bottles was a few centimeters above the tub water.
Although the water in the fish bottles did not change, the change of the tub water leading to its final dark color, affected the fish visual environment and made it absolutely dark.
Yet using the few-centimeters level difference between the bottle and the tub, the fish turned to the normal situation by reaching the upper surface.
www.shahabfotouhi.com /artwork/afewcent   (172 words)

 Sierra Leone - Wikipedia, the free encyclopedia
Much of Sierra Leone's coastline consists of mangrove swamps, with the exception of the peninsula on which the capital city Freetown is located.
The rest of Sierra Leone is mostly plateau (about 300 m above sea level) covered by forests, with mountains in the east of the country (highest point Loma Mansa, 1,948 m).
The climate is tropical, with a rainy season from May to December.
en.wikipedia.org /wiki/Sierra_leone   (1034 words)

 Elevations above Sea Level
I had fairly good agreement for the finish, at 485 feet above sea level.
I don't lose much sleep over any possible innacuracy - I often question the usefulness of the start/finish/highest/lowest elevation figures anyway - I'm sure the average runners never sees them, although for the few rare times a record is set they are necessary.
A course profile tells potential participants a lot more about the course than raw figures, unless it's to indicate that the course is so far above sea-level that getting proper levels of oxygen may be a factor.
measure.infopop.cc /eve/ubb.x/a/tpc/f/69510622/m/12610978/xsl/print_topic   (628 words)

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