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Effect of Gravity Waves from Small Islands in the Southern Ocean on the Southern Hemisphere Atmospheric CirculationThe effect of small islands in the Southern Ocean on the atmospheric circulation in the Southern Hemisphere is considered with a series of simulations using the NASA Goddard Earth Observing System Chemistry-Climate Model in which the gravity wave stress generated by these islands is increased to resemble observed values. The enhanced gravity wave drag leads to a 2 K warming of the springtime polar stratosphere, partially ameliorating biases in this region. Resolved wave drag declines in the stratospheric region in which the added orographic gravity waves deposit their momentum, such that changes in gravity waves are partially compensated by changes in resolved waves, though resolved wave drag increases further poleward. The orographic drag from these islands has impacts for surface climate, as biases in tropospheric jet position are also partially ameliorated. These results suggest that these small islands are likely contributing to the missing drag near 60 degrees S in the upper stratosphere evident in many data assimilation products.
Document ID
20180002915
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Garfinkel, C. I. (Hebrew Univ. Jerusalem, Israel)
Oman, L. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
May 16, 2018
Publication Date
January 17, 2018
Publication Information
Publication: Journal of Geophysical Research: Atmospheres
Volume: 123
Issue: 3
ISSN: 2169-897X
Subject Category
Oceanography
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN55177
Funding Number(s)
CONTRACT_GRANT: ISF 1558/14
Distribution Limits
Public
Copyright
Other
Keywords
chemistry-climate models
circulation
Gravity waves