タクラマカン砂漠での気球観測では上空に浮遊する黄砂の約10%が微生物と合体していた。黄砂が偏西風帯にまで舞い上がった時点ですでに微生物を付着させている可能性が高い。 能登半島での観測は、黄砂濃度上昇時に微生物濃度が上昇し「黄砂とともに大気圏を移動している」ことを強く示唆した。 立山山頂付近の積雪の黄砂層の微生物多様性はタクラマカン砂漠のものと高い類似性があり、砂塵発生源地からの長距離移動・拡散を示唆した。
About 10% of dust particles had internal mixing state of dust and bioaerosols on the basis of the field measurements made in the atmosphere at Taklamakan desert, and this observational fact suggested that atmospheric bioaerosols detected in KOSA episode were originally transported from dust source areas by westerly.
The measurements at NOTO peninsula showed clear increase in content of atmospheric bioaerosols during KOSA episode, and confirmed that bioaerosols were transported with KOSA particles in the atmosphere.
Bioaerosols have been detected in the dust layers in the snow layer which accumulated near the summit of Mt.Tateyama during winter, and also suggest the possible long range transport and global diffusion of bioaerosols from KOSA source regions.
砂漠上空の砂塵とバイオエアロゾルの混合状態に関する野外研究: 気球による直接採集
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SC-PR-IWASAKA-Y-kaken 2010-4p.pdf
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