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Summary Account

The climate of Japan is characterized by two contrasting large scale monsoon circulations in summer and winter. Because of the complex topography of Japanese islands and large scale monsoon circulation, the regional climate is characterized by considerable variability. To represent these local climates in Japan, we need to dynamically downscale the projection which has been prepared from coarse resolution global scale models circulation.

The Third Research Laboratory conducts research on regional climate change due to global warming and the relevant change in local weather character since these directly affect daily life and social economic activities.

Schematic image of the downscaling experiment

A multiple nesting method is used. Outer most model is an AGCM whose grid spacing is 20km. A regional model, the first NHRCM, with a grid spacing of 15 km, is nested within the AGCM. The AGCM does not have variables of cloud water, cloud ice, and other cloud properties, so the 15-km NHRCM grid is included to generate such variables for the lateral boundary of a smaller domain having a 5 km grid spacing. The domain of the 5-km inner grid is slanted from northeast to southwest. By skewing the inner domain, calculations are reduced, and the inner domain still covers almost all of the Japanese Archipelago.

Future changes in annual precipitation relative to the present climate: future / present x 100


Job titleName
HeadAtsushi Obata
Senior ResearcherMakoto Deushi
Senior Researcher Hiroaki Kawase
ResearcherMasaya Nosaka

last update : Apr. 4 2018
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