Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00382-009-0650-4 |
Local and synoptic mechanisms causing Southern California’s Santa Ana winds | |
Hughes, Mimi; Hall, Alex | |
通讯作者 | Hughes, Mimi |
来源期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
出版年 | 2010 |
卷号 | 34期号:6页码:847-857 |
英文摘要 | The atmospheric conditions that lead to strong offshore surface winds in Southern California, commonly referred to as Santa Ana winds, are investigated using the North American Regional Reanalysis and a 12-year, 6-km resolution regional climate simulation of Southern California. We first construct an index to characterize Santa Ana events based on offshore wind strength. This index is then used to identify the average synoptic conditions associated with Santa Ana events-a high pressure anomaly over the Great Basin. This pressure anomaly causes offshore geostrophic winds roughly perpendicular to the region’s mountain ranges, which in turn cause surface flow as the offshore momentum is transferred to the surface. We find, however, that there are large variations in the synoptic conditions during Santa Ana conditions, and that there are many days with strong offshore flow and weak synoptic forcing. This is due to local thermodynamic forcing that also causes strong offshore surface flow: a large temperature gradient between the cold desert surface and the warm ocean air at the same altitude creates an offshore pressure gradient at that altitude, in turn causing katabatic-like offshore flow in a thin layer near the surface. We quantify the contribution of "synoptic" and "local thermodynamic" mechanisms using a bivariate linear regression model, and find that, unless synoptic conditions force strongly onshore winds, the local thermodynamic forcing is the primary control on Santa Ana variability. |
英文关键词 | Santa Ana winds Katabatic winds Regional climate |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000277021400006 |
WOS关键词 | IDEALIZED TOPOGRAPHY ; BAJA-CALIFORNIA ; DOWNSLOPE WINDS ; GAP FLOWS ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | 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/2XILL650/163695 |
作者单位 | Univ Calif Los Angeles, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Hughes, Mimi,Hall, Alex. Local and synoptic mechanisms causing Southern California’s Santa Ana winds[J]. University of California, Los Angeles,2010,34(6):847-857. |
APA | Hughes, Mimi,&Hall, Alex.(2010).Local and synoptic mechanisms causing Southern California’s Santa Ana winds.CLIMATE DYNAMICS,34(6),847-857. |
MLA | Hughes, Mimi,et al."Local and synoptic mechanisms causing Southern California’s Santa Ana winds".CLIMATE DYNAMICS 34.6(2010):847-857. |
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