국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Airborne Observation of Atmospheric Carbon Dioxide over Sagami-Bay, Japan
저자	Toshinobu MACHIDA, Kenji YAZAWA, Takeshi TAGASHIRA, Gen INOUE, Takashi TAMARU
Keyword	carbon dioxide, airborne observation, carbon cycle, air ollution
URL	http://send.nal.go.jp/send/jpn/dlfile.php3/naltr0001422.pdf?doctype=7&filetype=20&path0=naltr0001422.pdf&path1=&path2=
보고서번호	NAL TR-1422
발행년도	2001.01
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	In order to ascertain temporal and spatial variations in atmospheric carbon dioxide (CO2) levels near the Tokyo metropolitan area, air samples have been collected by airplane since December 1996, over Sagami-Bay (35.0-35. L N, 139.2-139.4 E) in Japan. Sampling was carried out monthly from December 1996 to May 1997 and twice a month from June 1997 to December 1999, at eight altitudes from 0.5km to 7km. The CO2 concentration in these samples shows clear seasonal variation and secular increase. In the seasonal variations, larger amplitude and earlier phase were observed at lower altitudes. Annual average of CO2 concentration is higher at lower altitudes, suggesting that the ground surface around the observed area acts as a source of atmospheric CO2. Extremely high CO2 concentrations accompa-nied by high concentrations of CH4, N2O, CO and H2 were observed several times at lower altitudes, implying that anthropogenic air from the Tokyo metropolitan area often reaches to Sagami-Bay.