NDLI: Summer synoptic-scale waves over tropical west africa observed by trmm

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Summer synoptic-scale waves over tropical west africa observed by trmm

Content Provider	NASA Technical Reports Server (NTRS)
Author	Adler, Robert F. Huffman, George J. Starr, David O. Technical Monitor Gu, Guojun Curtis, Scott
Copyright Year	2003
Description	A 5-year daily rainfall dataset (3B42) from TRMM (Tropical Rainfall Measuring Mission) is used to investigate the activity and properties of westward-propagating synoptic-scale waves 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 partly ascribed to year-to-year variations of their embedded large-scale environment, especially the status of mid-tropospheric African easterly jet (AEJ). Generally, a stronger (weaker) AEJ indicates more (less) instability energy yielding a stronger (weaker) wave activity season. Seasonal mean rainfall has shown an impact on these waves in some years. However, the impact is not as clear and consistent as AEJ, implying the complexity of their relationship with large-scale environment. To fully understand interannual variability of synoptic-scale waves over tropical West Africa, including the variability in their preferred frequencies and wavenumbers, it is therefore necessary to examine possible intra-seasonal variations existing in both wave activity and large-scale fields, in addition to their structure, propagation, and associated convection.
File Size	4466736
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030053198
Archival Resource Key	ark:/13960/t6vx59s4c
Language	English
Publisher Date	2003-01-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Tropical Regions Rain Annual Variations Africa Trmm Satellite Summer Frequency Ranges Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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