HR: 0830h
AN: SA51A-0507    [PDF]
TI: Interannual Variability of Diurnal Tropospheric Heating and Diurnal Tides
AU: * Riggin, D M
EM: riggin@colorado-research.com
AF: Colorado Research Associates Div NorthWest Research Associates, 3380 Mitchell Lane, Boulder, CO 80301 United States
AU: Lieberman, R S
EM: ruth@colorado-research.com
AF: Colorado Research Associates Div NorthWest Research Associates, 3380 Mitchell Lane, Boulder, CO 80301 United States
AB: We present analyses of tropospheric diurnal heating, and middle atmosphere diurnal tides. Our study highlights interannual variations, which have received comparatively little attention in the literature compared with seasonal studies. Analyses of 12 years of data from the Kauai MF radar and 8 years of data from the Christmas Island MF radar reveal significant interannual amplitude enhancements in the diurnal tide, particularly during 1992 and 1997. The amplitude maximum in 1997 is correlated with above-average tropical tidal heating due to IR absorption by water vapor. The tidal heating was derived using the NASA Water Vapor Project (NVAP) climatology. Examination of 10 years of monthly averaged tropospheric diurnal water vapor heating reveals an interannual component that maximizes over the Indian and tropical central Pacific oceans. This component explains over 40% of the total variance in the 10-year diurnal climatology of water vapor heating. We also explore the role of convective heating in modulating tropospheric diurnal forcing.
DE: 3309 Climatology (1620)
DE: 3314 Convective processes
DE: 3332 Mesospheric dynamics
DE: 3359 Radiative processes
DE: 3384 Waves and tides
SC: SPA - Aeronomy [SA]
MN: 2003 Fall Meeting