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Mean sea level (MSL) is a measure of the average height of the ocean's surface (such as the halfway point between the mean high tide and the mean low tide); used as a standard in reckoning land elevation. MeasurementSea level measurements from 23 long tide gauge records in geologically stable environments show a rise of around 200 millimetres (8 inches) during the 20th century (2 mm/year).To an operator of a tide gauge, MSL means the "still water level"—the level of the sea with motions such as wind waves averaged out—averaged over a period of time such that changes in sea level, e.g., due to the tides, also get averaged out. One measures the values of MSL in respect to the land. Hence a change in MSL can result from a real change in sea level, or from a change in the height of the land on which the tide gauge operates. In the UK, mean sea level has been measured at Newlyn in Cornwall and Liverpool for decades, by tide gauges to provide Ordnance Datum for the zero metres height on UK maps. Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008. From Wikipedia under the
GNU Free Documentation License  ian.umces.edu 400px x 533px | 63.40kB [source page] Flood protection barrier in coastal Louisiana south of Houma showing marsh erosion and maintained marsh High Resolution Image 5808 KB only available for download by registered users free login or Register Now Free Quick Easy  sustainablemelbourne.com 370px x 500px | 153.10kB [source page] Models by Kate Archdeacon on June 25th 2009 Source Greenleap a list for people interested in leapfrogging rapidly to an ecologically sustainable economy Beach Huts by purplesnail Image by innpictime via Flickr  tomschindler.net 683px x 1024px | 166.00kB [source page] This is a shot looking towards the valley floor from Furnace Creek Inn From Yahoo Image Search: "Sea level"  planetearth.nerc.ac.uk unknown Mon, 22 Jun 2009 09:54:26 GM Current carbon dioxide (CO2) levels in the atmosphere may commit us to . sea. -. level. rises of up to 25 metres, says new research based on a comparison of Antarctic ice temperature records with new . sea. -. level. data from the Red . Sea. . ...  mickysmuses.blogspot.com Ayrdale hu, 09 Jul 2009 04:56:00 GM The TOPEX/POSEIDON (T/P) satellite mission provided observations of . sea level. change from 1992 until 2005. Jason-1, launched in late 2001 as the successor to T/P, continues this record by providing an estimate of global mean . sea level. ...  treehugger.com unknown ue, 10 Mar 2009 19:45:00 GM Islands such as the Maldives (pictured here), as well as the world's highly populated delta regions in India, Southeast Asia, and China will be seriously threatened by rising . sea. levels. Photo: Moosa Ali via flickr Think . sea level. rise. From Google Blog Search: "Sea level"  news.google.com Voice of America Scientists say that along the coast of Western Australia sea levels are rising at a rate double that of the world average. ... W Australia sea level rising fast BBC News all 6 news articles » news.google.com Business Standard At less than five feet above sea level , this archipelago is the lowest lying country on Earth. And, therefore, the country most at risk from climate change. ... news.google.com Sydney Morning Herald Lake Macquarie City Council had set up a sea level rise and climate change taskforce to deal with natural disasters and flooding caused by climate change. ... and more » From Google News Search: "Sea level" Why is SLP (sea level pressure) noted on a METAR, when it already notes the air pressure of the field? Q. Isn't it redundant? If I know the air pressure at field elevation, then I could figure out the air pressure if that location was hypothetically at sea level. Asked by unknown - Tue Oct 23 08:28:44 2007 - - 4 Answers - 0 Comments A. The interesting thing is METARs don't give field pressure. Altimeter settings are also sea level pressure. My altimeter can't be set to my field elevation pressure since it is about 27"Hg. I don't have a clue why they give it, other than for the few people who have only a MB scale on their altimeter. Answered by calnickel - Tue Oct 23 12:03:39 2007 What was the sea level 8000 years ago? Q. Why did it change? What is the highest and lowest the sea level has ever been? What is the average sea level of the last 30,000 years (During human times)? What were the climatic and geological condition during the extremes and the norm? Asked by hypnobunny - Sun Jun 27 18:58:32 2010 - - 4 Answers - 0 Comments A. 8,000 years ago: about 30 metres lower than present. Highest in the last 30,000 years: About 6,000 7,000 years ago it was about a metre higher than present when the earth was enjoying a particularly warm period (about 5c warmer than present). Lowest in the last 30,000 years: About 18,000-19,000 years ago it was 118 metres lower than present when the Earth was experiencing the last ice age (about 15c colder than present) Average over the last 30,000 years: approx 60m below present (very rough calculation). Temperature (from ice core samples) ftp://ftp.ncdc.noaa.gov/p ub/data/paleo/icecore/gre enland/summit/gisp2/isoto pes/gisp2_temp_accum_alle y2000.txt Sea Level (from sediment core samples) ftp://ftp.ncdc.noaa.gov/p ub/data/pa [cont.] Answered by DaveH - Sun Jun 27 19:49:38 2010 What is the height of clouds from sea level?
Q. Plz tell me that what is the height of clouds from sea level. Asked by H2F - Sat Apr 26 03:40:17 2008 - - 2 Answers - 0 Comments A. The height of clouds can vary anywhere from 0 feet (what we may know as fog) to well over 6000 feet. What is the the situation that relates to this questions. Cumulo-nimbus (a.k.a. thunderheads) apparently can reach 75,000 feet. Answered by tekwatcher - Sat Apr 26 03:44:46 2008 From Yahoo Answer Search: "Sea level" |
