Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1175/JAMC-D-13-063.1 |
Strong Down-Valley Low-Level Jets over the Atacama Desert: Observational Characterization | |
Munoz, Ricardo C.1; Falvey, Mark J.1; Araya, Marcelo2; Jacques-Coper, Martin3,4 | |
通讯作者 | Munoz, Ricardo C. |
来源期刊 | JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY
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ISSN | 1558-8424 |
EISSN | 1558-8432 |
出版年 | 2013 |
卷号 | 52期号:12页码:2735-2752 |
英文摘要 | The near-surface wind and temperature regime at three points in the Atacama Desert of northern Chile is described using two years of multilevel measurements from 80-m towers located in an altitude range between 2100 and 2700 m MSL. The data reveal the frequent development of strong nocturnal drainage flows at all sites. Down-valley, nose-shaped wind speed profiles are observed, with maximum values occurring at heights between 20 and 60 m AGL. The flow intensity shows considerable interdaily variability and a seasonal modulation of maximum speeds, which in the cold season can attain hourly average values of more than 20 m s(-1). Turbulent mixing appears to be important over the full tower layer, affecting the curvature of the nighttime temperature profile and possibly explaining the observed increase of surface temperatures in the down-valley direction. Nocturnal valley winds and temperatures are weakly controlled by upper-air conditions observed at the nearest aerological station. Estimates of terms in the momentum budget for the development and quasi-stationary phases of the down-valley flows suggest that the pressure gradient force due to the near-surface cooling along the sloping valley axes plays an important role in these drainage flows. A scale for the jet nose height of equilibrium turbulent down-slope jets is proposed that is based on surface friction velocity and surface inversion intensity. At one of the sites, this scale explains about 70% of the case-to-case observed variance of jet nose heights. Further modeling and observations are needed, however, to define better the dynamics, extent, and turbulence structure of this flow system, which has significant wind-energy, climatic, and environmental implications. |
英文关键词 | Complex terrain South America Downslope winds Drainage flow Boundary layer Automatic weather stations |
类型 | Article |
语种 | 英语 |
国家 | Chile ; Switzerland |
收录类别 | SCI-E |
WOS记录号 | WOS:000328349300008 |
WOS关键词 | FLOWS ; CHILE ; PART ; ANTARCTICA ; DYNAMICS ; WINDS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/177950 |
作者单位 | 1.Univ Chile, Dept Geophys, Santiago, Chile; 2.Ctr Nacl Medio Ambiente, Santiago, Chile; 3.Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland; 4.Univ Bern, Inst Geog, Bern, Switzerland |
推荐引用方式 GB/T 7714 | Munoz, Ricardo C.,Falvey, Mark J.,Araya, Marcelo,et al. Strong Down-Valley Low-Level Jets over the Atacama Desert: Observational Characterization[J],2013,52(12):2735-2752. |
APA | Munoz, Ricardo C.,Falvey, Mark J.,Araya, Marcelo,&Jacques-Coper, Martin.(2013).Strong Down-Valley Low-Level Jets over the Atacama Desert: Observational Characterization.JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY,52(12),2735-2752. |
MLA | Munoz, Ricardo C.,et al."Strong Down-Valley Low-Level Jets over the Atacama Desert: Observational Characterization".JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY 52.12(2013):2735-2752. |
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