Continuous measurements of stable isotopes of carbon dioxide and water vapour in an urban atmosphere: isotopic variations associated with meteorological conditions.

Isotope ratios of carbon dioxide and water vapour in the near-surface air were continuously measured for one month in an urban area of the city of Nagoya in central Japan in September 2010 using laser spectroscopic techniques. During the passages of a typhoon and a stationary front in the observation period, remarkable changes in the isotope ratios of CO2 and water vapour were observed. The isotope ratios of both CO2 and water vapour decreased during the typhoon passage. The decreases can be attributed to the air coming from an industrial area and the rainout effects of the typhoon, respectively. During the passage of the stationary front, δ13C-CO2 and δ18O-CO2 increased, while δ2H-H2Ov and δ18O-H2Ov decreased. These changes can be attributed to the air coming from rural areas and the air surrounding the observational site changing from a subtropical air mass to a subpolar air mass during the passage of the stationary front. A clear relationship was observed between the isotopic CO2 and water vapour and the meteorological phenomena. Therefore, isotopic information of CO2 and H2Ov could be used as a tracer of meteorological information.

Effect of Weather on Chief Complaints and Disorders of Outpatients / 日本温泉気候物理医学会雑誌

We investigated the effect of season or meteorological phenomena, on chief complaints and disorders of outpatients, by way of clarification of relationship between weather and health. This study covered the new outpatients of our division, and carried out on February '03 and June '03 (February: 72 males, 106 females, aged 49.9±18.5, June: 98 males, 109 females, aged 47.6±19.5). We categorized their clinical data into chief complaints (pain, headache, discomforts, fever, cough, vertigo/stagger, palsy) and disorders (gastrointestinal, mental, inflammatory, orthopedic, infection, respiratory, circulatory, tumorous, urinary, autoimmune/allergic, dental/oral, gynecological), then, compared the clinical data of February with June, in terms of seasonal disease. Additionally, we investigated the relationship between weather data and clinical data of February and June, from a perspective of meteoropathy. The average of meteorological phenomena (air pressure, air temperature, relative humidity, velocity of wind, day length, rainfall level) of a week before first visit, were used as weather data. The main results of analysis about seasonal disease, showed that the complaint of discomfort were more frequent in June than February (p=0.005). The orthopedic disorder was more frequent in June than February (p=0.012). Infection was more frequent in February than June (p=0.011). The analyses in terms of meteoropathy, showed that the complaint of cough were more frequent after cold temperature in February (p=0.014). The gastrointestinal disorders were more frequent after humid (p=0.018) and pluvious days (p=0.016) in February. The complaint of headache was liable to be frequent after pluvious weather in June.<br>The relationship between weather and health is known in the prior an, and our study anew demonstrated the effect of season or meteorological phenomena, on chief complaints and disorders of outpatients, as statistical evidence.