Island-Scale Circulations over the Island of Hawaii

夏威夷大岛上空的岛屿规模环流

• 批准号: 0140387
• 负责人: Yi-Leng Chen
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140387&HistoricalAwards=false
• 关键词: Island; Scale; Circulations; over; Hawaii

The interactions of atmospheric flows with mountains are an important issue in atmospheric sciences. Orography plays a role in both local weather as well as influencing the larger scale flow. The isolation of the mountainous Island of Hawaii provides a natural laboratory for studies of the impacts of orography. In 1990 a cooperative project among several researchers, the Hawaiian Rainband Project (HaRP), was executed to study the influence of the island on local weather and fundamental mountain/atmospheric flow interactions. To date, most HaRP analyses have focused on the airflow, thermodynamic fields and radar echoes on the windward side and the evolution of early morning rain bands offshore of Hilo. In this project the Principal Investigator (PI) will extend analysis to the airflow along the windward coast and offshore as well as circulations on the lee side. Furthermore, the PI will simulate the complete diurnal cycle of the island-scale airflow and weather under different trade-wind conditions (e.g. strong trades vs. weak trades; low trade-wind inversion height vs. high trade-wind inversion height) using an advanced mesoscale numerical model. Analysis of observations will be used to validate model results. Results from modeling studies will improve basic understanding of the diurnal and local effects for the island of Hawaii under the summer trade-wind weather. These results potentially can have benefits in helping to interpret airflow in other complex terrain situations.

大气流动与山脉的相互作用是大气科学中的一个重要问题。 地形在局部天气中起作用，并影响较大尺度的流动。 多山的夏威夷岛与世隔绝，为研究地形影响提供了天然实验室。 1990年，几位研究人员合作开展了一个项目，即夏威夷雨带项目（HaRP），以研究夏威夷岛对当地天气和基本山脉/大气流相互作用的影响。 到目前为止，大多数HaRP分析集中在迎风面的气流，热力场和雷达回波和希洛近海清晨雨带的演变。在本项目中，主要研究者（PI）将分析扩展到沿迎风海岸和离岸的气流沿着以及背风侧的环流。 此外，PI将使用先进的中尺度数值模型模拟不同信风条件下（例如，强信风与弱信风;低信风逆温高度与高信风逆温高度）岛屿尺度气流和天气的完整日循环。 观测分析将用于验证模型结果。模拟研究的结果将提高对夏季信风天气下夏威夷岛的日变化和局部影响的基本认识。 这些结果可能有助于解释其他复杂地形情况下的气流。