Publication List was updated.
We released V1901(MA) daily precipitation and climatology.
APHRODITE-2 funding ended. You are welcome to send comments/questions at; however, our support will not be as frequent as we were.
We will have a maintenance of the web server from 9:30 to 10:30 JST (0:30-1:30 UTC) on 13 November. We apologize for the inconvenience in advance.
We released V1801_R1(MA).
We released V1801_MA, V1101EX, V1808_MA (temperature), and APHRO_JP (V1207R3).
"APHRODITE-2 Hirosaki Workshop Sakura Science Workshop in Hirosaki University"was held.
We hosted a session "Precipitation Extremes -- Observations, Modelling, Projections (AS29)" at AOGS2018 in Hawaii.
We hosted a session "Precipitation Extreme (A-AS05)" at JpGU2018 in Makuhari, Chiba, Japan.
APHRODITE-2 Hirosaki Workshop was held.
APHRODITE-2 project got high grade (A) at the interim evaluation.
APHRODITE-2 workshop (11-14 Sep.2017) was held in Chiba University.
APHRODITE-2 workshop will be held in Kathmandu, Nepal, this November.
We released APHRO_JP update.
We will have APHRODITE-2 workshop (11-14 Sep.2017)
International workshop was held on March 7th & March 8th in 2017.
Location: TKP Kyoto Shijokarasuma Kaigishitsu.
Advisory board meeting was held in Tokyo.
Kick-off meeting was held in Hirosaki.
APHRODITE-2 Project has just started!
APHRODITE homepage is renewed!


Asian Precipitation - Highly-Resolved Observational Data Integration Towards Evaluation of Extreme Events

The APHRODITE project aims to create accurate daily grid precipitation data over Asian land areas with a high spatial and temporal resolution based on rain-gauge observations. The APHRODITE-2 project, funded by the Ministry of Environment of Japan, started in June 2016 and will continue until March 2019. Hirosaki University, Kyoto University and Chiba University are now collaborating for the further development of the APHRODITE algorithm.

One of today's greatest concerns is the future hydrometeorological conditions as a consequence of human-induced climate change.The increase in extreme events is especially a focus of international scientific and political frameworks, such as the World Climate Research Programme ( WCRP ) and IPCC. The APHRODITE products ( Yatagai et al., 2009; Kamiguchi et al. 2010; Yasutomi et al. 2011; Yatagai et al. 2012 ) are used for many climatological and hydrological studies, including the downscaling of low-resolution model data, and for validating satellite observations.

The well-known APHRODITE precipitation data are hence expected to be used in the evaluation of extreme events. However, conflicting " end-of-day "times is one issue that must be resolved for further usage of APHRODITE data ( e.g. comparisons with disaster records, combined use with satellite estimates, statistical analyses ).

We therefore apply a time adjustment within APHRODITE-2, and evaluate the change of extreme statistics according to gridding process and the time adjustment. Furthermore, we compare meteorological conditions, such as heavy rainfall, APHRODITE precipitation and disaster events, to help understand and improve the forecasting of extreme events, thereby producing an improved APHRODITE algorithm. These efforts will inform decision making at a political level with regard to the risk associated with hydrological changes as a result of global warming. For example, the change in extreme precipitation events and river runoff.

Development of the APHRODITE algorithm is based on discussions with various users, including climate modelers and developers of satellite precipitaion algorithms. We welcome feedback from users, as well as any kind of cooperation, especially with regard to the sharing of observational data.