The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams...
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![Page 1: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/1.jpg)
The Influence of Topographically Trapped Waves on the Ross Ice
Shelf Air Stream Manda Adams
University of Wisconsin-Madison
![Page 2: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/2.jpg)
Ross Ice Shelf Air Stream (RAS)
![Page 3: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/3.jpg)
Siple Dome
Ross Island
Siple Coast
Transantarctic Mountains
![Page 4: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/4.jpg)
University of Wisconsin-Madison Nonhydrostatic Modeling System (UW-
NMS)• Quasi-Compressible, enstrophy conserving
model in non-Boussinesq framework• Fully Scaleable• Multiple two-way nested grids• Five categories of precipitating hydrometeors
– Rain, pristine crystals, rimed mature crystals, aggregate crystals, graupel
• Cloud active long and short wave radiation• TKE based turbulence closure• Variable Step Topography
![Page 5: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/5.jpg)
Slope limited to 1 vertical grid increment per horizontal grid increment or else face stability problems.
![Page 6: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/6.jpg)
Must step discretely in one vertical grid interval, which makes subtle topography nearly impossible to represent.
![Page 7: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/7.jpg)
Both steep and subtle topography can be represented
![Page 8: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/8.jpg)
University of Wisconsin-Madison Nonhydrostatic Modeling System (UW-
NMS)
![Page 9: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/9.jpg)
![Page 10: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/10.jpg)
Surges in the RAS
May 20-21, 2003
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Surges in the RAS
![Page 12: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/12.jpg)
Was that an isolated event?
May 15-16, 2004 April 23-24, 2004
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Surges in the RAS
![Page 14: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/14.jpg)
![Page 15: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/15.jpg)
AWS Locations
![Page 16: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/16.jpg)
Siple Dome
![Page 17: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/17.jpg)
Elizabeth
![Page 18: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/18.jpg)
Brianna
![Page 19: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/19.jpg)
Lettau
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Marilyn
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Pressure at 5km(10mb increment)
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What does the vertical structure look like?
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Potential Vorticity
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Why are some events stronger?
![Page 25: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/25.jpg)
Are these events due to topographically trapped waves?
![Page 26: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/26.jpg)
Are these events due to topographically trapped waves?
2/11
gHf
R
R=233km
R=190km
R=165km
HgC
![Page 27: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/27.jpg)
Are these events due to topographically trapped waves?
2/11
gHf
R
HgC
R=170 km
![Page 28: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/28.jpg)
Conclusions
• Surges within the RAS simulated by the UW-NMS are a robust feature associated with the movement of a large scale trough onto the Siple Coast– Surges associated with wind speeds in excess of
30ms-1 temperature drops in excess of 20oC/hr– Cold air surge generated by deepening of the cold air
as it dams up along the Transantarctic Mountains– Consistent with a topographically trapped internal
Kelvin Wave– Numerical Simulations of this feature are consistent
with the limited available observations
![Page 29: The Influence of Topographically Trapped Waves on the Ross Ice Shelf Air Stream Manda Adams University of Wisconsin-Madison.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649ef65503460f94c09441/html5/thumbnails/29.jpg)
Future Work
• Look at the AMPS archive to get an idea of the climatology of surges in the RAS due to topographically trapped waves
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Questions?