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sea level

The level of the surface of the ocean, based on the average level between high and low tides, which is used as a datum when calculating the height of features on land or depth in the ...

sea level

sea level   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

... level The average level of the sea, halfway between low and high...

sea level

sea level   Quick reference

The Concise Oxford Dictionary of Archaeology (2 ed.)

Reference type:
Subject Reference
Current Version:
2009
Subject:
Archaeology, History
Length:
72 words

... level [De] The mean height of water in the sea between highest and lowest tides. There are long‐term variations in sea level as a result of two processes: changes in the volume of water held in the oceans, which is known as eustatic sea level change; and movements in the relative height of the land surface as a result of deformations in the earth's crust, which is known as isostatic ...

sea level

sea level   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... level Modern analyses of sea-level changes due to glacial isostatic adjustment are based on the classic sea-level equation by Farrell and Clark (1976) Geophys. JR Astr. Soc. 46 ; Mitrovica and Milne (2003) Geophys. J. Int. 154, 2 present a further equation. See Kendal et al. (2005) Geophys. J. Int. 161, 3 on theoretical approaches to computing gravitationally self-consistent sea-level changes due to ice growth and ablation . For something like 227 000 of the last 250 000 years, sea levels were around 10 m below their current stand (...

Sea Level

Sea Level   Reference library

Encyclopedia of Climate and Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2011
Subject:
Science and technology, Earth Sciences and Geography, Social sciences, Environment
Length:
2,558 words
Illustration(s):
4

...sea level change, now, for the first time, there is unambiguous evidence of regional variability of sea level change with some regions exhibiting sea level trends approximately 10 times the global mean. It is in the western Pacific and eastern Indian Oceans that sea level rise presents the highest magnitude. It is also worth noting that the whole Atlantic Ocean shows sea level rise during the past decade. In contrast, sea level has been dropping in some regions (eastern Pacific and western Indian Oceans), even though in terms of the global mean sea level has...

Sea Level

Sea Level   Reference library

Encyclopedia of Global Change

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Environmental Science, Social sciences, Environment
Length:
7,469 words
Illustration(s):
1

...known variability of the altitude of sea level spatially and temporally renders the calculation of global mean sea level of little practical value, and the search for a eustatic sea level curve is now redundant. Evidence for Sea Level Changes Profiles of sea level change on contrasting time scales may be derived from modern instrumental records, historical documentary, and archaeological records, and the geologic record. Instrumental record Tide gauges measure daily, seasonal, annual, and interannual changes in sea level and are located at ports, in estuaries,...

sea level

sea level   Quick reference

M. V. Angel

The Oxford Companion to Ships and the Sea (2 ed.)

Reference type:
Subject Reference
Current Version:
2007
Subject:
History, Social sciences
Length:
515 words

... level . Variations in sea level over short time scales are familiar effects of tides , winds and waves , but globally mean sea levels are affected by fluctuations in the amount of water in the oceans, the shape of the oceanic basins and the warmth of the interior of the oceans. Ocean basins are constantly, albeit slowly, changing shape as a result of tectonic movements. Over geological time scales sea levels have fluctuated by several hundred metres. During the Miocene Era the Strait of Gibraltar opened and closed several times. Each time the strait closed,...

sea level

sea level   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... level The level of the surface of the ocean , based on the average level between high and low tides , which is used as a datum when calculating the height of features on land or depth in the ocean. It is used as a standard base for measuring heights and depths on the Earth, and it is the baseline for plotting the global hypsometric curve , and for calculating the heights of mountains and the depth of ocean trenches . Atmospheric pressure readings are usually expressed as sea level equivalents in order to eliminate the effects of altitude , and...

mean sea level

mean sea level   Reference library

The Oxford Essential Dictionary of the U.S. Military

Reference type:
Subject Reference
Current Version:
2002

...sea level the sea level halfway between the mean levels of high and low...

sea-level pressure

sea-level pressure   Quick reference

A Dictionary of Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2008

...-level pressure The pressure at sea level, calculated from the observed pressure at the station. The value plotted on the most commonly available isobaric charts...

mean sea level

mean sea level   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...sea level The average height of the surface of the sea, for all stages of the tide, over a long (usually 19-year) period, being determined from hourly readings of tidal height. A tidal gauge measures the sea level in relation to the adjacent coast; since the land may also be moving vertically, this does not represent an absolute measure of sea level. Radar altimetry measures the absolute sea level as the distance between the sea surface and the satellite housing the radar transmitter and...

Sea Level Future

Sea Level Future   Reference library

The Oxford Companion to Global Change

Reference type:
Subject Reference
Current Version:
2009
Subject:
Science and technology, Environmental Science, Social sciences, Environment
Length:
3,110 words
Illustration(s):
3

...so that some reefs will maintain upward growth with a rising sea level. Others may survive to grow up to the surface when the sea-level rise slows or stops. A more rapid sea level rise (>2 cm/yr) would lead to the drowning of corals and the submergence of inert reef formations. Sea Level Future. Effects of Tectonic Activity.A submerged Lycian tomb in southern Turkey indicates that subsidence has occurred as a result of tectonic activity. Islands on coral reefs will be modified by a rising sea level. Many cays and low wooded islands will be eroded by larger...

mean sea level

mean sea level   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

...sea level The long‐term average height of the water level of the sea surface at a particular...

mean sea level

mean sea level   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...sea level The average height of the surface of the sea, for all stages of the tide, over a long (usually 19-year) period, being determined from hourly readings of tidal...

sea level change

sea level change   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... level change A long‐term change in the relative level of land and sea, which can be caused by isostatic adjustment of the land (as a result of tectonic forces ), and/or by eustatic change (change in the volume of water that is stored in the oceans ). Geological evidence suggests that during the height of the last glaciation (about 18 000 years ago) sea level was between 110 m and 140 m lower than it is today, and large areas of the continental shelves were dry land. Sea level has risen through the post‐glacial period (the so‐called Flandrian ...

Quaternary sea-level changes

Quaternary sea-level changes   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Earth Sciences and Geography
Length:
1,589 words
Illustration(s):
1

...have often been used to determine eustatic sea-level changes. This analysis suggests that rapid fluctuations in sea level have occurred during the Quaternary, with 22 glaciations in the past 1.6 million years. It is noteworthy that the curve indicates that prior to 900 000 years ago sea level fluctuated by about 100 m, while since that time the fluctuations have been in the region of 180 m. The current view also suggests that sea level stood near present-day levels during each interglacial. Fig. 1. Sea-level changes during the Quaternary. (a) Oxygen...

Ice Age Sea Level

Ice Age Sea Level   Reference library

Encyclopedia of Climate and Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2011
Subject:
Science and technology, Earth Sciences and Geography, Social sciences, Environment
Length:
1,834 words
Illustration(s):
3

...the rate of sea level rise during meltwater pulse IA was about ICE AGE SEA LEVEL. Figure 2. Sea level curves for the past 130,000 years. The black circles show depths of Barbados coral ( Acropora palmata ) plotted against ages determined by uranium-thorium mass spectrometry. The sea level curve is compared to sea level curves derived from oxygen isotope records in deep-sea sediments by two different research groups (the gray and dashed lines). The solid line shows the summer insolation curve at 65° north latitude. Note that the highest sea levels occur...

Communicating Sea Level Rise

Communicating Sea Level Rise   Reference library

Karen Akerlof, Michelle Covi,, and Elizabeth Rohring

The Oxford Encyclopedia of Climate Change Communication

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Earth Sciences and Geography, Social sciences, Environment
Length:
16,912 words
Illustration(s):
5

...than sea level rise. In Delaware, 46% were completely convinced of climate change but only 39% of sea level rise; in Maryland, 44% were very or extremely sure that climate change was happening but only 18% on sea level rise. • Most people in these states understand that climate change is a cause of sea level rise (DE, 79%; MD, 61%). But only a third of Marylanders said that climate change contributes “a lot” to sea level rise (34%), and just 28% of Marylanders said that sea level rise is entirely or mostly the result of human activities. • Sea level rise is...

Global Sea Level Observing System

Global Sea Level Observing System   Quick reference

A Dictionary of Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2008

...Sea Level Observing System ( GLOSS ) An international programme aimed at obtaining accurate data on global and regional sea levels for various purposes, including long-term studies of climatic change . Satellite altimetry is employed to compensate for changes in the elevation of recording sites through geological processes, using signals from the Global Positioning System satellites to define the position of sites in a global reference...

sea-level changes and palaeoclimate

sea-level changes and palaeoclimate   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003

...in an estimated eustatic sea-level fall of about 120 m below present levels. The immense Laurentide ice sheet contributed about half to this total, and Antarctica about 20 m. The British ice sheet, which reached as far south as north Norfolk, the Midlands, and South Wales, was small by comparison. It had a volume of only 0.8 million km 3 and contributed about 1.0 m to global lowering of sea level. Ice and sea level are also of utmost concern today. If all the remaining continental ice were to melt, the resulting rise in sea level would be about 90 m, with...

sea level

sea level n   Quick reference

Pocket Oxford Italian Dictionary: English-Italian (4 ed.)

Reference type:
Bilingual Dictionary
Current Version:
2012
Subject:
Bilingual dictionaries
Length:
16 words

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