Asymmetry and non-linearity in upper tropospheric humidity variability

Details Asymmetry and non-linearity in upper tropospheric humidity variability Asymmetry and non-linearity in upper tropospheric humidity variability

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vasc5k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 22, pp. ASC 5-1, CiteID 2161, DOI 10.1029/2003GL018238

Physics

Global Change: Climate Dynamics (3309), Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Radiative Processes

Scientific paper

Changes in upper tropospheric humidity (UTH) are important in understanding the climatic response to increased anthropogenic forcing. This paper explores the asymmetry and non-linearity in the response of subtropical UTH to tropical intraseasonal forcing. During northern winter, subtropical UTH anomalies, varying on intraseasonal timescales, propagate eastwards from northern Africa to the central Pacific. There is a discontinuity in the propagation of moist anomalies over the Tibetan Plateau, whilst dry anomalies show reduced propagation in the lee. This is consistent with the expected evolution of cyclones and anticyclones incident on high topography. Correlations of five-day mean UTH show no significant linear correlation between moist anomalies over Indonesia and subtropical anomalies to the north. This appears to be explained by the limitation of dry anomalies in the region of low ambient vorticity south of the East Asian Jet Stream.

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