Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10584-011-0300-9 |
Human-induced changes in wind, temperature and relative humidity during Santa Ana events | |
Hughes, Mimi1; Hall, Alex2; Kim, Jinwon2 | |
通讯作者 | Hughes, Mimi |
来源期刊 | CLIMATIC CHANGE |
ISSN | 0165-0009 |
出版年 | 2011 |
卷号 | 109页码:119-132 |
英文摘要 | The frequency and character of Southern California’s Santa Ana wind events are investigated within a 12-km-resolution downscaling of late-20th and mid-21st century time periods of the National Center for Atmospheric Research Community Climate System Model global climate change scenario run. The number of Santa Ana days per winter season is approximately 20% fewer in the mid 21st century compared to the late 20th century. Since the only systematic and sustained difference between these two periods is the level of anthropogenic forcing, this effect is anthropogenic in origin. In both time periods, Santa Ana winds are partly katabatically-driven by a temperature difference between the cold wintertime air pooling in the desert against coastal mountains and the adjacent warm air over the ocean. However, this katabatic mechanism is significantly weaker during the mid 21st century time period. This occurs because of the well-documented differential warming associated with transient climate change, with more warming in the desert interior than over the ocean. Thus the mechanism responsible for the decrease in Santa Ana frequency originates from a well-known aspect of the climate response to increasing greenhouse gases, but cannot be understood or simulated without mesoscale atmospheric dynamics. In addition to the change in Santa Ana frequency, we investigate changes during Santa Anas in two other meteorological variables known to be relevant to fire weather conditions-relative humidity and temperature. We find a decrease in the relative humidity and an increase in temperature. Both these changes would favor fire. A fire behavior model accounting for changes in wind, temperature, and relative humidity simultaneously is necessary to draw firm conclusions about future fire risk and growth associated with Santa Ana events. While our results are somewhat limited by a relatively small sample size, they illustrate an observed and explainable regional change in climate due to plausible mesoscale processes. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000298757300006 |
WOS关键词 | WESTERN UNITED-STATES ; SOUTHERN CALIFORNIA ; BAJA-CALIFORNIA ; CLIMATE-CHANGE ; MODEL ; SIMULATIONS ; SENSITIVITY ; RESPONSES ; REGIMES ; SCHEME |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
来源机构 | University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/167634 |
作者单位 | 1.Natl Ocean & Atmospher Adm, Earth Syst Res Lab, Div Phys Sci, Boulder, CO 80305 USA; 2.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Hughes, Mimi,Hall, Alex,Kim, Jinwon. Human-induced changes in wind, temperature and relative humidity during Santa Ana events[J]. University of California, Los Angeles,2011,109:119-132. |
APA | Hughes, Mimi,Hall, Alex,&Kim, Jinwon.(2011).Human-induced changes in wind, temperature and relative humidity during Santa Ana events.CLIMATIC CHANGE,109,119-132. |
MLA | Hughes, Mimi,et al."Human-induced changes in wind, temperature and relative humidity during Santa Ana events".CLIMATIC CHANGE 109(2011):119-132. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。