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Summary Account

Temperature of the Earth's atmosphere is determined by the balance between the input of solar radiation (short wave radiation) from the sun and output of infrared radiation (long wave radiation) from the Earth. This balance is strongly modulated by the existence of cloud particles and aerosols (floating materials in the atmosphere), which absorb or scatter these radiations, and atmospheric trace gas components including water vapor and carbon dioxide, which absorb and reradiate radiations, to have strong impact on the atmospheric temperature. Thus, long term change of these substances has very strong impact on the climate change such as the global warming. We analyzed the impact of these substances on the balance of the Earth's radiation through the ground-based, air craft, and satellite observation and simulations using radiation transfer model.

Observation at Miyakojima city

Right hand photos show instruments which observe short wave radiation from the sun and long wave radiation at Miyakojima, Okinawa prefecture, Japan (25N, 125E). Many radiations, including direct and scattered solar radiation, with spectral bands of visible to near infrared radiations are observed by number of instruments (left). The angular distribution of sky radiance observed by sky-radiometer (right) enable us to examine the influence of aerosols, clouds, and water vapors on the solar radiation.


Job titleName
HeadNozomu Ohkawara
Senior ResearcherAkihiro Yamazaki
Senior ResearcherRei Kudo
Senior ResearcherRyoji Nagasawa
(Concurrent post)Haruma Ishida
Guest ResearcherAkihiro Uchiyama


Research on innovation of observation, diagnosis and prediction for global environmental monitoring

Environmental issues affecting locations in the vicinity of Japan have become increasingly serious in recent years. The aim of this research is to clarify the mechanism and the actual situation of constituents that affect the global environment through the observation of aerosols, ozone and other greenhouse gases in areas including East Asia and the western Pacific Ocean. JMA will continue its efforts to contribute to society and the scientific community based on sophisticated monitoring, diagnosis and prediction technology for the global environment using data assimilation, analysis technology and chemical transport modeling.

Research on development of monitoring system for earth radiation budget and investigation of its effect on climate change

The characteristics of the earth's climate are determined by its radiation budget - a term describing the balance of incoming solar radiation and outgoing terrestrial infrared radiation. This metric is therefore an important factor in the earth's climate system. The radiation budget is affected by aerosols, clouds and various other substances, as well as by atmospheric trace gases such as carbon dioxide and water vapor. The long-term trend of the earth's radiation budget causes climate change manifested by phenomena such as global warming. However, understanding of the mechanism behind the radiation budget remains insufficient, and this is considered to be one of the main reasons for the uncertainty of global warming prediction. In this study, the effects of these substances on the earth's radiation budget will be investigated using ground-based observation data, aircraft observation data and satellite data with numerical models of radiative transfer.

last update : May 1 2017
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