The tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and Precipitation
Radar (PR) data are used in this study to reveal diurnal variations of precipitation
over the Tropics (30◦S − 30◦N) from January, 1998, to December 2002. The TMI data
were used for the regions over oceans and islands and the PR data was used over continents.
The observations are sorted regionally to examine the difference in diurnal cycle of rainfall
over ocean, island, and continental regions. The rain rate is averaged over individual two
hour intervals of local time in each region to include more observations in order to reduce
the sampling error. F-test is used to determine those regions whose diurnal cycle is detected
at the 95% confidence level.
In most oceanic regions there is a maximum at 0400 LST - 0700 LST. The amplitude
of diurnal variation over ocean regions with small total rain is a little higher than that of
the ocean regions with heavy total rain. The diurnal cycle peaks at 0700 LST - 0800 LST
over islands with rainfall variation similar to surrounding oceanic regions. A maximum
at 1400 LST - 1500 LST was found in areas over continents with heavy total rain, while
the maximum occured at 1900 LST - 2100 LST over continents with lesser total rain. The
amplitudes of variation over continents with heavy total rain and with small total rain do
not show significant differences. The diurnal cycle in in JJA (June, July, August) and DJF
(December, January, February) varies with latitude over continents. A seasonal cycle of
diurnal cycle can also be found in some oceanic regions. The diurnal cycle annual change
is not evident over continents, while the diurnal cycle annual change over oceans exists in
some regions. Island regions in this paper exhibit no evident seasonal and annual diurnal
change.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/1266 |
| Date | 15 November 2004 |
| Creators | Wu, Qiaoyan |
| Contributors | North, Gerald R. |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 3647266 bytes, 59643 bytes, electronic, application/pdf, text/plain, born digital |
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