Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nclm3g&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 14, pp. CLM 3-1, CiteID 1729, DOI 10.1029/2003GL017402
Physics
2
Meteorology And Atmospheric Dynamics: Tropical Meteorology, Meteorology And Atmospheric Dynamics: Precipitation (1854), Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: Climatology (1620)
Scientific paper
A 5-year daily rainfall dataset (3B42) from TRMM is used to investigate the activity and properties of westward-propagating synoptic-scale waves [i.e., African easterly waves (AEW)] over tropical West Africa. Evident wave signals appearing in wavenumber-frequency space show their modulations on the surface rainfall pattern during the boreal summer. Interannual variability exists in both their intensity and spectral properties, i.e., dominant frequency and wavenumber ranges. These variabilities can be ascribed in part to year-to-year variations of their embedded large-scale environment, especially the mid-tropospheric African easterly jet (AEJ). Generally, a stronger (weaker) AEJ indicates more (less) instability energy, yielding a stronger (weaker) wave activity season. Both seasonal mean rainfall and AEWs were weak in 2001 but not in 1999. Consequently, there may exist a nonlinear relationship between the AEJ, AEWs and mean rainfall. To fully understand interannual variability of synoptic-scale waves over tropical West Africa, including the variability in the waves' preferred frequencies and wavenumbers, it is necessary to examine possible intra-seasonal variations in both wave activity and large-scale fields, in addition to their structure, propagation, and associated convection.
Adler Robert F.
Curtis Scott
Gu Guojun
Huffman George J.
No associations
LandOfFree
Summer synoptic-scale waves over West Africa observed by TRMM 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 Summer synoptic-scale waves over West Africa observed by TRMM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Summer synoptic-scale waves over West Africa observed by TRMM will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1467767