Correlations of mesospheric winds with subtle motion of the Arctic polar vortex Center for Solar-Terrestrial Research, New Jersey Institute of Technology, 323 Martin Luther King Jr. Boulevard, 101 Tiernan Hall, Newark, NJ 07102-1982, USA
Received: 24 Jul 2009 – Published in Atmos. Chem. Phys. Discuss.: 06 Aug 2009Abstract. This paper investigates the relationship between high latitude upper
mesospheric winds and the state of the stratospheric polar vortex in the
absence of major sudden stratospheric warmings. A ground based Michelson
Interferometer stationed at Resolute Bay (74°43' N, 94°58' W)
in the Canadian High Arctic is used to measure mesopause region neutral winds
using the hydroxyl (OH) Meinel-band airglow emission (central altitude of ~85 km).
These observed winds are compared to analysis winds in the upper stratosphere
during November and December of 1995 and 1996; years characterized as cold,
stable polar vortex periods. Correlation of mesopause wind speeds with those
from the upper stratosphere is found to be significant for the 1996 season
when the polar vortex is subtly displaced off its initial location by a strong
Aleutian High. These mesopause winds are observed to lead stratospheric winds
by approximately two days with increasing (decreasing) mesospheric winds
predictive of decreasing (increasing) stratospheric winds. No statistically
significant correlations are found for the 1995 season when there is no such
displacement of the polar vortex.
Revised: 16 Dec 2009 – Accepted: 27 Dec 2009 – Published: 19 Jan 2010
Citation: Bhattacharya, Y. and Gerrard, A. J.: Correlations of mesospheric winds with subtle motion of the Arctic polar vortex, Atmos. Chem. Phys., 10, 431-436, doi:10.5194/acp-10-431-2010, 2010.