東京大学 · 地球惑星科学
M. Koike教授の研究室では、大気化学と気象学の分野において、地上観測と数値モデルを融合した大気中における化学種の変化を解明しています。特に、火山噴煙に伴うオゾン層破壊に関連する窒素酸化物（HNO₃）の変化や、極域における低層雲の微粒子濃度と気溶膠の関係を、長期間にわたる観測データを基に分析しています。また、大気中の一酸化炭素（CO）の季節変動やその起源を、FTIR観測と化学輸送モデルを用いて評価しています。
Figures are computed from collected data and may differ slightly.
Ground based infrared observations of HNO 3 column amount at Lauder, New Zealand (45°S, 170°E), show significant increases in HNO 3 following the arrival of Pinatubo volcanic aerosols. The increase first became apparent in September 1991 when the HNO 3 amount was higher than that expected from the regular seasonal variation by 2.3 × 10 15 cm −2 , which corresponds to 16% of the unperturbed value. Between September 1991 and May 1993, the observed HNO 3 amounts were systematically higher, typicall
Abstract Two years of continuous in situ measurements of Arctic low‐level clouds have been made at the Mount Zeppelin Observatory (78°56′N, 11°53′E), in Ny‐Ålesund, Spitsbergen. The monthly median value of the cloud particle number concentration ( N c ) showed a clear seasonal variation: Its maximum appeared in May–July (65 ± 8 cm −3 ), and it remained low between October and March (8 ± 7 cm −3 ). At temperatures warmer than 0 °C, a clear correlation was found between the hourly N c values and t
Tropospheric carbon monoxide (CO) was measured throughout 2001 using ground‐based Fourier transform IR (FTIR) spectrometers at Moshiri (44.4°N) and Rikubetsu (43.5°N) observatories in northern Japan, which are separated by 150 km. Seasonal and day‐to‐day variations of CO are studied using these data, and contributions from various CO sources are evaluated using three‐dimensional global chemistry transport model (GEOS‐CHEM) calculations. Seasonal maximum and minimum FTIR‐derived tropospheric CO a
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