Arid
DOI10.1175/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
ISSN1558-8424
EISSN1558-8432
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
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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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