Mathematics – Logic
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgrd..11220110l&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue D20, CiteID D20110
Mathematics
Logic
7
Atmospheric Processes: Tides And Planetary Waves, Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)
Scientific paper
This study focuses on interannual variations of diurnal tropospheric heating and the response in the mesosphere observed by radars and predicted by a model. The work is prompted by reports of interannual variability in amplitudes of tidal variables at low latitudes. Diurnal tides observed at Hawaii and Christmas Island exhibit a pronounced ``spike'' in amplitude from late 1997 to early 1998. It has been speculated that this variability may be linked to the El Niño-Southern Oscillation phenomenon. We examine diurnal solar heating due to water vapor absorption, and diurnal latent heat release due to deep convection between 1988 and 2005. Both of these heating drives exhibit anomalously higher amplitudes in the tropical central and eastern Pacific during 1997-1998. The altered heating patterns result in a stronger forcing of the migrating diurnal tide by water vapor heating, and excitation of several weaker nonmigrating modes by latent heating. A primitive equation model is used to evaluate how these drives contribute to diurnal winds in the mesosphere. Anomalous water vapor heating results in about 15% increases in model meridional wind amplitudes over climatological values at subtropical latitudes between 300°E and the Greenwich meridian. While the timing of the model amplitude enhancements is consistent with observations at Hawaii, the observed increases are significantly stronger. Our study indicates that water vapor heating is the larger contributor to tidal enhancement observed during 1997-1998.
Lieberman Ruth S.
Nesbitt Stephen W.
Ortland David A.
Riggin Dennis M.
Vincent Anthony R.
No associations
LandOfFree
Variability of mesospheric diurnal tides and tropospheric diurnal heating during 1997-1998 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 Variability of mesospheric diurnal tides and tropospheric diurnal heating during 1997-1998, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variability of mesospheric diurnal tides and tropospheric diurnal heating during 1997-1998 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1866955