A Study on the Impact Potential of Acid Materials in Falling and Seposited Snow

酸性物质对落雪和积雪的影响潜力研究

• 批准号: 07680567
• 负责人: HASEGAWA Takeshi
• 金额: $ 1.34万
• 依托单位: AKITA NATIONAL COLLEGE OF TECHNOLOGY (ANCT)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680567/
• 关键词: ACID-SNOW; ACID-RAIN; FALLING SNOW; DEPOSITED SNOW; pH VALUE; ELECTRICAL CONDUCTIVITY; NITROGEN DIOXIDE; REMOTE SENSING BY LANDSAT; TMデータ; 氷晶核

Acidity of snow and rain has been studied in Akita region for the past five years. From our results,(1) There is little difference between average pH-value of snow and that of rain. The variation in electrical conductivity for snow is lager than that of rain. There is small difference in the pH-value of snow between coastal region samples and inland ones. From the phenomenon, a process of getting hold all those materials on snow flakes could be the "washout".(2) The amount of nitrate, NO_3^-、in the air becomes greater in winter. It seems likely one the origin of snow acidity, and, acidity materials flows with the air flow in the Northern Hemisphere. The seasonal predominant North-western wind in winter supports this argument.(3) For the estimation of forest, plants and water resources assessments, three TM images of LANDSAT-5 were analyzed by using "supervised training fields" technique. These maps must be the basic information of the environment of Akita region.

在过去的五年里，人们一直在研究秋田地区的雪和雨的酸度。结果表明：（1）雪和雨的平均pH值差别不大;雪的电导率变化比雨大。沿海地区和内陆地区雪样的pH值差异不大。从这一现象来看，将所有这些物质吸附在雪花上的过程可能是“冲刷”。(2)空气中的硝酸盐，NO_3^-，在冬季含量增加。这可能是雪酸度的来源之一，在北方半球，酸性物质随气流流动。冬季的季节性主导西北风支持这一论点。(3)为了进行森林、植物和水资源的评估，利用“监督训练场”技术对LANDSAT-5的三幅TM图像进行了分析。这些地图必须是秋田地区环境的基本信息。

项目成果

Hasegawa, T.et. al.: "A Study of Acidity of Snow" ISCORD'97. (in print). (1997)

长谷川，T.et。