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Originally posted by majestictwo
Cheers for your input
Nature Geoscience 1, 106 - 110 (2008)
Published online: 13 January 2008 | doi:10.1038/ngeo102
Subject Categories: Climate science | Cryospheric science
Recent Antarctic ice mass loss from radar interferometry and regional climate modelling
Eric Rignot1,2,3, Jonathan L. Bamber4, Michiel R. van den Broeke5, Curt Davis6, Yonghong Li6, Willem Jan van de Berg5 & Erik van Meijgaard7
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Large uncertainties remain in the current and future contribution to sea level rise from Antarctica. Climate warming may increase snowfall in the continent's interior1, 2, 3, but enhance glacier discharge at the coast where warmer air and ocean temperatures erode the buttressing ice shelves4, 5, 6, 7, 8, 9, 10, 11. Here, we use satellite interferometric synthetic-aperture radar observations from 1992 to 2006 covering 85% of Antarctica's coastline to estimate the total mass flux into the ocean. We compare the mass fluxes from large drainage basin units with interior snow accumulation calculated from a regional atmospheric climate model for 1980 to 2004. In East Antarctica, small glacier losses in Wilkes Land and glacier gains at the mouths of the Filchner and Ross ice shelves combine to a near-zero loss of 4+/-61 Gt yr-1. In West Antarctica, widespread losses along the Bellingshausen and Amundsen seas increased the ice sheet loss by 59% in 10 years to reach 132+/-60 Gt yr-1 in 2006. In the Peninsula, losses increased by 140% to reach 60+/-46 Gt yr-1 in 2006. Losses are concentrated along narrow channels occupied by outlet glaciers and are caused by ongoing and past glacier acceleration. Changes in glacier flow therefore have a significant, if not dominant impact on ice sheet mass balance.
Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE
Department of Earth System Science, University of California, Irvine, California, USA
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
We use monthly measurements of time-variable gravity from the GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission to determine the ice mass-loss for the Greenland and Antarctic Ice Sheets during the period between April 2002 and February 2009. We find that during this time period the mass loss of the ice sheets is not a constant, but accelerating with time, i.e., that the GRACE observations are better represented by a quadratic trend than by a linear one, implying that the ice sheets contribution to sea level becomes larger with time. In Greenland, the mass loss increased from 137 Gt/yr in 2002–2003 to 286 Gt/yr in 2007–2009, i.e., an acceleration of −30 ± 11 Gt/yr2 in 2002–2009. In Antarctica the mass loss increased from 104 Gt/yr in 2002–2006 to 246 Gt/yr in 2006–2009, i.e., an acceleration of −26 ± 14 Gt/yr2 in 2002–2009. The observed acceleration in ice sheet mass loss helps reconcile GRACE ice mass estimates obtained for different time periods.
Received 28 July 2009; accepted 3 September 2009; published 13 October 2009.
Originally posted by TheRedneck
P.S.: hello, Mel. You seem to be in a terrible mood today. Hope you feel better soon.
Originally posted by vermonster
I thought we were in a cooling cycle. How could this be?
Originally posted by endisnighe
Can you please post evidence of rising waters in any location? Can you post any weather data that states that in the past 10 years global temperatures are on the rise? Can you please post any evidence?
Or are we just to assume that what Gore's Inconvenient Truth is the truth and scientific data is a lie?
When it affects us personally then we may care.
We're just along for the ride anyway. Try to enjoy it.
We're not here for a long time, but for a good time!
Originally posted by TheRedneck
reply to post by elfie
There is little awareness, however, that the rapidly rising relative sea level within the bay is also having dramatic and wide-ranging effects. Islands once populated in colonial time and during the past century have disappeared due to submergence and related shore erosion.
No rising sea levels here; instead we have submerging islands and shore erosion. The sea rise is relative, meaning only with respect to the shoreline and not necessarily with respect to any previous sea level.
The Modern Setting
Continuous tide gauge records around the Chesapeake Bay show that the rate of sea-level rise during the 20th century has not been constant and that modern rates are more rapid than those determined by geologic studies conducted two decades ago. The current rate of sea-level rise at the mouth of the Chesapeake is about 4 millimeters per year (about 1.3 feet per century) and decreases northward. Tide gauges with longer periods of record, like that at Solomons Island, Md., midway along the length of the bay, record mean sea level since 1937 and illustrate a 3-millimeter-per-year rate of rise (about 1 foot per century) (fig. 6). Areas described as marsh in colonial times have given way to shallow creeks. Dead trees farther up tributary creeks characterize areas only recently submerged to become marsh. Tree stumps of former forests can be found beneath the sediments of tributary creeks. Sea-level rise continues....(graph snipped)
The Chesapeake Bay Today
Tide gauges for the Chesapeake Bay and the Mid-Atlantic coast show rates of sea-level rise twice that of the worldwide average. Scientists disagree on the cause of the recent increase in the rate of rise. Is the increase caused by land subsidence, or is it related to a changing climate and ocean volume? Anthropogenic (man-induced) causes are often sought to account for anomalies in the short historical records of environmental change. Sediment compaction resulting from extraction of ground water is another popular explanation used today to account for land subsidence. On a much broader scale, a zone of subsidence along the entire Mid-Atlantic coast has been attributed to crustal adjustment still taking place following the removal of vast thicknesses of glacier ice to the north thousands of years ago (isostatic adjustment).
Predictions of Relative Sea-Level Change and Shoreline Erosion over the 21st Century on Tangier Island, Virginia
Didn't have to go past the title. Your own description nailed this one: a prediction, not an occurrence.
Maybe I am wrong, but I took endisnighe's post to be asking for actual sea level changes. Remember that any rise in sea level would affect the entire globe, not just one area. raising sea level in one isolated area would be akin to piling up a pile of water on one side of a pool; it doesn't work that way.
There has been no sea level rise to date, despite predictions.