A Study of Mechanism of "Yamase" Events and Their Prediction
“山濑”事件发生机制及其预测研究
基本信息
- 批准号:05452373
- 负责人:
- 金额:$ 3.65万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1993
- 资助国家:日本
- 起止时间:1993 至 1994
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Observational and theoretical studies have been made to understand mechanism of "Yamase" and the results obtained are summarized as follows.1. A composite analysis of the five-day mean 500 hPa weather charts for summer seasons from 1958 to 1989 has been performed and the characteristic atmospheric circulation pattern is found to be associated with Yamase-type weather in the northern Japan.A factorial analysis is applied to the daily mean temperature anomalies obtained at the 16 weather stations in the east side of the northern Japan during June and July for the three years from 1990 to 1992. Anomalously low temperatures on the Pacific Ocean side are observed about 2 days later than those in the Okhotsk Sea side.2. A mechanism to cause the cool and humid weather in Yamase events is investigated with use of a two-dimensional numerical model which includes processes of cloud formation and long-wave radiation. A prediction experiment has also been made for the remarkable Yamase period from 17th to 19th July 1993 with use of a revised version of the Japan Spectral Model, JMA.The following three problems are shown to be crucial to clarify mechanism of intense Yamase events with fog and/or stratus : (1) thermodynamical conditions of the lower atmosphere in the high pressure system over Okhotsk Sea, (2) role of surface buoyancy flux during the southward movement of cooled airmass from Okhotsk Sea, and (3) interaction among a) amount of water vapor phase change b) cooling rate of cloud-top radiation and c) rate of entrainment into a mixed layr on the evolution of the moist convective mixed layr.
为了了解“Yamase”的作用机制,我们进行了观察和理论研究,所得结果总结如下: 1.对 1958 年至 1989 年夏季 5 日平均 500 hPa 天气图进行了综合分析,发现特征性大气环流模式与日本北部的山濑型天气有关。日本北部东部16个气象站1990年至1992年三年间6月和7月的日平均气温距平数据。太平洋一侧的观测时间比鄂霍次克海一侧的观测时间晚2天左右。2.使用二维数值模型研究了山濑事件中凉爽潮湿天气的形成机制,其中包括云形成和长波辐射的过程。利用日本光谱模型的修订版JMA,对1993年7月17日至19日的显着山濑期进行了预测实验。结果表明,以下三个问题对于阐明大雾强烈山濑事件的机制至关重要和/或层云:(1)鄂霍次克海上空高压系统中低层大气的热力学条件,(2)在冷气团向南运动过程中表面浮力通量的作用鄂霍次克海,以及(3)a)水蒸气相变量b)云顶辐射冷却速率和c)混合层夹带速率对湿对流混合层演化的相互作用。
项目成果
期刊论文数量(52)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
HUKUOKA,Yoshitaka: "The dendroclimatological study on the climate reconstruction of Little Ice Age by old diaries." Journal of Geography. 102. 119-124 (1993)
HUKUOKA,Yoshitaka:“利用旧日记重建小冰期气候的树木气候学研究。”
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- 影响因子:0
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ASAI,Tomio: "Unusual weather and meteorological disasters." Yobo-jiho. 172. 20-26 (1993)
浅井富雄:“异常天气和气象灾害。”
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浅井,冨雄: "異常気象と災害" 予防時報. 172. 20-26 (1993)
浅井富夫:“异常天气和灾害”《预防时报》172. 20-26 (1993)。
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TAKAHASHI,Hideo: "Secular variation in rainfall distribution and monsoon circulation over tropical Asia." Proceedings of International Symposium on Paleoenvironmental Change in Tropical-Subtropical Monsoon Asia (IGBP-PAGES Symposium). (in press). (1995)
TAKAHASHI,Hideo:“热带亚洲降雨分布和季风环流的长期变化。”
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TAKAHASHI,Hideo: "Synoptic condition over East Asia during the early-summer rainy season (Baiu season) from the point of view of the temporal continuity of rainfall in the southwestern part of Japan." Journal of the Meteorological Society of Japan. 71. 61
TAKAHASHI,Hideo:“从日本西南部降雨时间连续性的角度来看,初夏雨季(梅雨季)东亚天气状况。”
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ASAI Tomio其他文献
ASAI Tomio的其他文献
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{{ truncateString('ASAI Tomio', 18)}}的其他基金
Unusual Weather due to Irregular Activity of Polar Airmass and Associated Heavy Rainfall.
由于极地气团的不规则活动和相关的强降雨而导致异常天气。
- 批准号:
03452061 - 财政年份:1991
- 资助金额:
$ 3.65万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
A study of meso-scale vortex-like convective clouds observed over the seas around Japan
日本周边海域观测到的中尺度涡旋对流云研究
- 批准号:
60460048 - 财政年份:1985
- 资助金额:
$ 3.65万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)