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| Titel |
A 57-Year Daily Gridded Precipitation Dataset for Asia Based on a Dense Network of Rain Gauges -APHRODITE project- |
| VerfasserIn |
Atsushi Hamada, Kenji Kamiguchi, Osamu Arakawa, Natsuko Yasutomi, Akiyo Yatagai |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038358
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| Zusammenfassung |
| An updated version of long-term daily gridded precipitation dataset for 1951-2007 over Asia
is described. The previous version (APHRO_V0902; Yatagai et al., 2009, SOLA) has already
been created by collecting rain gauge observation data across Asia, through the activities of
the Asian Precipitation – Highly Resolved Observational Data Integration Towards
the Evaluation of Water Resources (APHRODITE) project. The current version
(APHRO_V0912) is extended for additional 10 years from APHRO_V0902 and will be
provided on our Website (http://www.chikyu.ac.jp/precip/).
APHRO_V0912 is the only product with long-term (57-yr), high-resolution (0.25- and 0.5-),
and continental-scale based on a dense network of daily rain-gauge data for Asia. The
number of valid raingauges used for analysis was between 5000 and 12,000, representing 2.3
to 4.5 times the data available through the Global Telecommunication System network, which
were used for most daily grid precipitation products. APHRO_V0912 well reproduces
precipitation characteristics in mountainous areas, especially in the Himalayas and the
Middle East.
Extensive quality controls (QC) are performed before carrying out interpolation. Many kind
of errors are found in not only station metainfomation, but precipitation data themselves, e.g.,
unit-of-measurement error. We will feed the information on errorneous data detected by the
QC scheme back to data centers and/or the organizations who kindly provided the rain-gauge
data.
We also develop a new interpolation method based on an Angular-Distance-Weighting
(ADW) method. This new method considers local topographical features between rain-gauge
and intepolation point, e.g., high crest, and reduces the oversmoothing problem in ADW
method.
The product has already contributed to studies such as the evaluation of Asian water
resources, diagnosis of climate change, statistical downscaling, and verification of
numerical model simulation and satellite-based high-resolution precipitation estimates. |
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