巻号一覧
54 巻 (1998)
- 4 号 p. 315-
- 3 号 p. 225-
- 2 号 p. 125-
- 1 号 p. 1-
54 巻, 4 号
選択された号の論文の7件中1～7を表示しています
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町村 尚1998 年 54 巻 4 号 p. 315-322
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーSensible and latent heat flux above a deciduous forest was measured directly by eddy correlation method using a sonic anemometer and a fine thermocouple psychrometer during rainfall. Analizing the power spectum of the wind speed components, the sonic anemometer (Kaijo Denki, WA-200) was considered to have operated well even in heavy rainfall. The fine thermocouple psychrometer had two problems; one was the heating by solar radiation and another was the slow response time. Nevertheless, it was regarded to be accurate enough when used in rainy days with low solar radiation and low fluctuation of air temperature and humidity. The dry-bulb of the fine thermocouple psychrometer was small enough, so it seldome caught rain drops; only one measurement out of 130 was affected by a rain drop. Error in calculated heat flux caused by catching a rain drop on the dry-bulb of the fine thermocouple psychrometer was estimated. Standard error was expected to be 10W m-2 both for sensible and latent heat flux. As a conclusion, the eddy correlation system with a sonic anemometer and a fine thermocouple psychrometer was available for measurement of sensible and latent heat flux during rainfall.抄録全体を表示PDF形式でダウンロード (2640K) -
本條 毅, 水谷 敦司, 高倉 直1998 年 54 巻 4 号 p. 323-328
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーTo investigate cooling effect of urban green spaces, meteorological measurements were undertaken at an urban green space (Tanashi Experimental Farm, area: 23.5ha) located at suburban Tokyo Metropolis.
By using moving platform (bicycle and motorcycle), distributions of temperature and humidity were measured along a course from the green space to the urban area in summer and winter. For the accurate measurement, the continuously measured data were stored in the data recorder. In most cases, lower temperature in the green space was observed. The temperature decrease in the green space was higher at daytime in summer and at night in winter. From the variation of temperature, the influenced distance was estimated less than 60m.
Air and soil temperature, wind velocity and direction were also measured from August to December at fixed measuring points. Difference of daily averaged air temperature between the green space and the urban area was small but decrease of soil temperature in the green space was observed clearly.抄録全体を表示PDF形式でダウンロード (2241K) -
細野 達夫, 野内 勇1998 年 54 巻 4 号 p. 329-336
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーLarge diurnal variations in methane flux from rice paddies have been found in many studies. The cause of the large variations in methane flux was considered to be resulted from changes in methane production rates in the soil and/or the transport capacity of rice plants. To get better information about the mechanism of diurnal variation in methane flux, effects of both methane production and methane transport on the diurnal variation in methane flux were investigated. Methane flux from a rice paddy was continuously measured using a flow-through chamber method for 2 days. Methane concentration in the soil water was also measured every 2-4 hour during the period. Using the data obtained, net methane production rate was calculated from the mass balance of methane in the rice paddy, while the conductance of rice plants for methane transport was calculated by using a diffusion model as the transport capacity of methane. As a result, both the net methane production rate and the conductance of rice plants for methane transport clearly showed large diurnal variations, which were associated with the diurnal change in soil temperature. From the comparison with the diurnal patterns among the methane flux, the methane production rate, the conductance of rice plants and soil temperature, the change in the methane flux is considered to be mostly attributed to the changes in the conductance of rice plants for methane transport depending on the soil temperature.抄録全体を表示PDF形式でダウンロード (1068K) -
黒瀬 義孝, 唐 立松, 大場 和彦, 丸山 篤志, 真木 太一1998 年 54 巻 4 号 p. 337-343
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーTo clarify the effect of windbreaks on meteorological improvement at an oasis in an arid land, an investigation was carried out in September 1997, in Turpan, China. Using a mobile observation method, horizontal variations of air temperature and relative humidity were measured along two routes traversing through an oasis to a desert. Observations were carried out in days of fine weather, at the time of the day when air temperature was maximum and relative humidity was minimum.
The meteorological condition differs with the arrangement of windbreaks in the routes. In the first route which characterized by firm windbreaks at an average of 490m intervals, entering into the oasis from the desert at 1km distance, air temperature decreased by about 5°C and relative humidity increased by 14%. Air temperature and relative humidity were constant at a distance of over 1km from the desert into the oasis. In the second route which characterized by thin and less than 10m height windbreaks, entering into the oasis from the desert at 6km distance, air temperature decreased by 0.7°C and relative humidity increased by 3%.
The meteorological conditions vary between the marginal area and central area of the oasis. Hence, it is necessary to consider meteorological conditions of the area prior to determination of a suitable land for crop production. For instance, the marginal area of an oasis is suitable for cultivating sorghum and cotton because of the influence of desert climate, which makes the area hotter and drier than the central area of an oasis. Sorghum can be grown under hot and dry conditions. High quality cotton can be produced in irrigated, and hot and dry conditions.抄録全体を表示PDF形式でダウンロード (3958K) -
富士原 和宏1998 年 54 巻 4 号 p. 345-351
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (1102K) -
皆川 秀夫1998 年 54 巻 4 号 p. 353-357
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (849K) -
北海道における気候変動と農業へのインパクト気候変化影響研究部会1998 年 54 巻 4 号 p. 359-361
発行日: 1998/12/15
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (353K)
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