<![CDATA[Grist - Comment Feed for Greenland ice sheet could raise East Coast sea levels 20 inches by 2100 - to over 6 feet]]> Grist Comment Feed en Comment #1 by Bud Dingler http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/ Mon, 15 Jun 2009 13:46:15 -0700 http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/1 What a fairy tale....

seriously look at this graph recently updated

http://wattsupwiththat.files.wordpress.com/2009/06/rss-may-2009.png

if you can have an open mind you can see that we might be back into the old "window" of normal temps ocsilating between plus 0.3C and minus 0.3C. 

its a THEORY folks - means we are always considering new data to see if it fits our hypothesis. could go either way considering the potential affects of the drastically reduced sunspot activity. 

what would Joe say ten years from now if we stay in the old window of plus and minus 0.3C? 

 

]]> What a fairy tale....

seriously look at this graph recently updated

http://wattsupwiththat.files.wordpress.com/2009/06/rss-may-2009.png

if you can have an open mind you can see that we might be back into the old "window" of normal temps ocsilating between plus 0.3C and minus 0.3C. 

its a THEORY folks - means we are always considering new data to see if it fits our hypothesis. could go either way considering the potential affects of the drastically reduced sunspot activity. 

what would Joe say ten years from now if we stay in the old window of plus and minus 0.3C? 

 

]]> Comment #2 by Tom Twigg http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/ Mon, 15 Jun 2009 14:39:23 -0700 http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/2 Won't rising sea levels effect all coasts more or less equally, or am I missing something?

]]> Won't rising sea levels effect all coasts more or less equally, or am I missing something?

]]> Comment #3 by dstoney http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/ Mon, 15 Jun 2009 16:15:06 -0700 http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/3 Dr. Romm,  Yes, 1 - 2 meters (about 3 - 6 feet) of sea level rise is now commonly discussed for the 21st century.  Two questions, which perhaps you can address, stand out:

1 - How much of the projected 21st century sea level rise is already built into the climate system due to GHG emissions up to the present?

2 - How quickly must CO2 levels peak and begin to decline to avoid the higher-end (or worse) sea level rises?

 

 

]]> Dr. Romm,  Yes, 1 - 2 meters (about 3 - 6 feet) of sea level rise is now commonly discussed for the 21st century.  Two questions, which perhaps you can address, stand out:

1 - How much of the projected 21st century sea level rise is already built into the climate system due to GHG emissions up to the present?

2 - How quickly must CO2 levels peak and begin to decline to avoid the higher-end (or worse) sea level rises?

 

 

]]> Comment #4 by wwilliam http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/ Mon, 29 Jun 2009 12:03:28 -0700 http://www.grist.org/article/greenland-ice-sheet-could-raise-east-coast-sea-levels-an-extra-20-inches-by/4 Recent rapid changes at the edges of the Greenland and West Antarctic ice sheets show acceleration of flow and thinning, with the velocity of some glaciers increasing more than twofold. Glacier accelerations causing this imbalance have been related to enhanced surface meltwater production penetrating to the bed to lubricate glacier motion, and to ice-shelf removal, ice-front retreat, and glacier ungrounding that reduce resistance to flow. The present generation of models does not capture these processes. It is unclear whether this imbalance is a short-term natural adjustment or a response to recent climate change, but processes causing accelerations are enabled by warming, so these adjustments will very likely become more frequent in a warmer climate. The regions likely to experience future rapid changes in ice volume are those where ice is grounded well below sea level such as the West Antarctic Ice Sheet or large glaciers in Greenland like the Jakobshavn Isbrae that flow into the sea through a deep channel reaching far web design inland. Inclusion of these processes in models will likely lead to sea-level projections for the end of the 21st century that substantially exceed the projections presented in the IPCC AR4 report (0.28 ± 0.10 m to 0.42 ± 0.16 m rise).

]]> Recent rapid changes at the edges of the Greenland and West Antarctic ice sheets show acceleration of flow and thinning, with the velocity of some glaciers increasing more than twofold. Glacier accelerations causing this imbalance have been related to enhanced surface meltwater production penetrating to the bed to lubricate glacier motion, and to ice-shelf removal, ice-front retreat, and glacier ungrounding that reduce resistance to flow. The present generation of models does not capture these processes. It is unclear whether this imbalance is a short-term natural adjustment or a response to recent climate change, but processes causing accelerations are enabled by warming, so these adjustments will very likely become more frequent in a warmer climate. The regions likely to experience future rapid changes in ice volume are those where ice is grounded well below sea level such as the West Antarctic Ice Sheet or large glaciers in Greenland like the Jakobshavn Isbrae that flow into the sea through a deep channel reaching far web design inland. Inclusion of these processes in models will likely lead to sea-level projections for the end of the 21st century that substantially exceed the projections presented in the IPCC AR4 report (0.28 ± 0.10 m to 0.42 ± 0.16 m rise).

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