Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1911c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1911
Physics
[3334] Atmospheric Processes / Middle Atmosphere Dynamics, [3363] Atmospheric Processes / Stratospheric Dynamics
Scientific paper
Stratospheric sudden warmings (SSW) are a dynamical phenomenon that occurs in the wintertime middle atmosphere. SSW events occur much more frequently in the northern hemisphere (NH) compared to the southern hemisphere (SH). In multiple simulations of the period 1953-2006 in the Whole Atmosphere Community Climate Model (WACCM), SSW events are generated spontaneously in both the Arctic as well as Antarctica. While multiple SSW events in the Arctic have been studied in detail from both observations and models, SSW events reported from Antarctica have been confined to observations of a major SSW event in 2002 and a minor SSW event in 2010. In this study we present a detailed analysis of multiple WACCM generated SSW events in the Antarctic and compare the response of the stratosphere and MLT region during the SSW events to responses in the Arctic. We also present comparisons in the planetary wave activity in the NH and SH, which constitute the triggering mechanism for the SSW events as well as the gravity wave forcing during these events. We find that almost all SSW events in Antarctica are minor SSW and are almost always late winter events occurring in late September, similar to the 2002 SSW event. We also present detailed analysis of a mid-winter SH SSW, which is an extremely rare event. The planetary wave activity triggering the SSW in the SH in WACCM appears to be wave 2, while in the NH it is predominantly wave 1. The occurrence frequency of all (minor plus major) SSW in the SH is ~ 0.18/year compared to ~ 0.94/year in the NH.
Chandran Anushya
Collins Richard L.
Garcia Rafael
Marsh Daniel R.
No associations
LandOfFree
A comparison of Arctic and Antarctic sudden stratospheric warmings generated in the Whole Atmosphere Community Climate Model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A comparison of Arctic and Antarctic sudden stratospheric warmings generated in the Whole Atmosphere Community Climate Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A comparison of Arctic and Antarctic sudden stratospheric warmings generated in the Whole Atmosphere Community Climate Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-875439