Role of Satellite based precipitation information in the mountainous region Madan L. Shrestha Nepal Academy of Science and Technology The 7 th Global Precipitation Measurement International Planning Workshop Bellesalle Kudan, Tokyo, Japan 5-7 December

Major Weather Systems Northern limit Of the Tropics. Southern lap of the Himalayas Mountainous country Topographically complex Affected by monsoon In summer and western disturbances in winter 26º 22' N - 30º 27' N Lat. 80º 4'E - 88º 12'E Long Kilometers India China Iran Pakistan Myanmar Thailand Afghanistan Laos Nepal Cambodia Bangladesh Oman Bhutan Sri Lanka Turkmenistan Malaysia Kilometers Summer Monsoon Western disturbances

Physiography

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The Diversity TRANS HIMALAYA HIGH HIMALAYA MIDLANDSTERAI

Meteorological Stations in Nepal Rainfall Station337 Climate Station 67 Agrometeorological Station 22 Synoptic Station 9 Aerosynoptic Station 6 Total442 Automatic Weather Station 18

High rainfall pocket areas - Middle mountains Extreme rainfall areas Churia and Terai regions Rainfall distribution

PET > P Therefore these regions have a continual water deficit. P > PET Therefore these regions have water excess throughout the year. Jomsom

Extreme rainfall events

On 10 July 2007 heavy rain in the village of Khunde in Everest region produced a devastating mud slide

27.75N, 86.75E N E 27-28N E 27-29N 86-88E [mm/h] Precipitation in Khumbu region July 1-31, 2007 TRMM-3B42 data (Yasunari, 2007 in prep.) July Heavy rainfall

Time of day [UTC] Day of year Day – Time cross section of rainfall (3B42) at 27.75N, 86.75E inJuly in 2007 Heavy rainfall And flood July 10

[mm/h] Rainfall distribution 2007 JUL9-13 at 6hourly TRMM 3B42 Contour ・・・ topograghy 1000m,2500m,5000, [LT = UTC ＋ 6] Heavy rain ↓ この豪雨の前後を 時空間的に細かく見ると ↓↓

Use of such satellite precipitation data Remotely sensed precipitation data (ex. TRMM) is invaluable. Validation of these data can be made with available in situ data. Enhance the research capability and help to monitor the precipitation, both in the temporal as well as the spatial manner in a remote area, otherwise not possible. Understand the interaction of monsoon circulation with the orography.

Constraint and Challenges Installation of stations in high mountains is difficult and demand more time and resources. Accessibility of TRMM data? Any other such precipitation data available? Need of the training on such available data sets Resolution of the data Downscaling of the data to apply in a complex topography like the Himalayas.