{"_buckets": {"deposit": "25d3e861-2ffa-405d-b89e-b948864c1b93"}, "_deposit": {"id": "958", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "958"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00000958"}, "item_2_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "\u8d70\u67fb\u578b\u5206\u5149\u653e\u5c04\u8a08\u306b\u3088\u308b\u4ed9\u53f0\u4e0a\u7a7a\u306e\u30a8\u30a2\u30ed\u30be\u30eb\u306e\u9577\u671f\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0"}]}, "item_2_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1991-01", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "1", "bibliographicPageEnd": "70", "bibliographicPageStart": "57", "bibliographicVolumeNumber": "69", "bibliographic_titles": [{"bibliographic_title": "Journal of the Meteorological Society of Japan. Ser. II"}]}]}, "item_2_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Measurements of direct solar irradiance and sky radiance were carried out in Sendai, Japan for the period from September 1981 to May 1985 using a scanning spectral radiometer (aureolemeter). Size distributions of columnar total aerosols were retrieved by inverting both spectral optical thickness and solar aureole radiance data. The size distribution of aerosols due to the El Chichon eruption in 1982 was estimated as the difference between columnar volume spectra before and after the eruption. The results indicate that the El Chichon aerosol had a monomodal volume spectrum with a mode radius about 0.5 \u03bcm; their contribution to the total aerosol volume reached the maximum in the winter of 1983, i. e. December 1982 to February 1983, then gradually decaying to the normal level prior to the eruption by the spring of 1985. A seasonal model of tropospheric aerosols over Sendai was constructed by subtracting the volume spectrum of the El Chichon aerosol model from that of the columnar total aerosols, and successfully represented by a bimodal log-normal function. The aerosols in spring and summer seasons have different features in respect of volume spectra. The coarse particle mode aerosols with radii around 3\u03bcm are predominant in spring while the accumulation mode aerosols with radii around 0.2\u03bcm are predominant in summer.", "subitem_description_type": "Abstract"}, {"subitem_description": 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