SEMINAR: REMINDER: AOML Seminar - November 14, 2011 - Dr. Aixue Hu - “The potential influence of the land-based ice loss on MOC and global climate”

[Sang-Ki Lee <Sang-ki.Lee@noaa.gov>]

> *AOML** **Seminar ***
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> * *
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> *DATE:**               **Monday, November 14, 2011*
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> * TIME:**              ** 10:30 a.m.  a.m. – refreshments at *
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> *        **10:15 a.m.** *
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> *Location**:    AOML First Floor Conference *
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> *                         ** Room *
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> *SPEAKER:**    **    Dr.  Aixue Hu *
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> *        **                  **National Center for Atmospheric Research 
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> **TITLE:**      **        “The potential influence of the *
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> *                          land-based  ice loss on MOC *
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> *                          and  global climate**”*
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> *ABSTRACT:* Observed evidence indicates a net loss of the global land-based ice and a rising of the global sea level. 
> It is not clear how this loss of land-based ice could affect the global climate in the future except the sea level. 
> Here, we use the National Center for Atmospheric Research Community Climate System Model version 3 to evaluate the 
> potential influence of a shrinking land-based ice on the Atlantic meridional overturning circulation (MOC) and the surface 
> limate in the next two centuries under the IPCC A1B scenario with prescribed rates of Greenland Ice Sheet, Western Antarctic 
> Ice Sheet, and the mountain glacier and ice cap melting. Our results show that the MOC, in general, is only sensitive to the 
> discharge of freshwater directly into the North Atlantic in the next two centuries. The loss of the Western Antarctic
> For the Greenland Ice loss, a low rate of Greenland melting will not significantly alter the MOC, but a moderate to high rate 
> of Greenland melting does make the MOC weaken further. This further weakened MOC will not make the global climate in the next 
> two centuries cooler than in the late 20th century, but will lessen the warming, especially in the northern high latitudes. 
> Moreover, the sea level changes due to steric effect and ocean dynamics could potentially aggravate the sea level problem 
> ear the northeast North America coast and the islands in the western Pacific region. On the other hand, in comparison to the 
> simulation without the inclusion of the land ice runoff, the projected precipitation increase in the North America is significantly 
> reduced, and even becomes a net reduction in the cases that the AMOC further slows down when the land ice runoff is included.

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