Some Insights into the Characteristics and Dynamics of the Chilean Low-Level Coastal Jet

Jiang, Qingfang; Wang, Shouping; O’Neill, L. W.

doi:10.1175/2010mwr3368.1

Cited by 31 publications

(38 citation statements)

References 32 publications

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“…During summer the wind-speed pattern in the area is substantially different, with the highest wind speeds occurring closer to the coast, particularly along Morocco until Cape Blanc, with two distinct high wind-speed areas (close to 9 m•s −1 ) north and south of Canary Islands. These mesoscale intensifications of the surface wind speed along the coast in the EBCCS area, on the north-west African coast, occur due to the sharpening of the pressure gradient there through a positive feedback process triggered by upwelling and by the low SST at the coast [64][65][66][67]. The low SST decreases the air temperature within the MABL at the coast, and a sharp inversion develops due to warm subsiding air above [68,69].…”

Section: Wind Sea and Swell Wave Heights And Periodsmentioning

confidence: 99%

Seasonal Variability of Wind Sea and Swell Waves Climate along the Canary Current: The Local Wind Effect

Semedo

2018

JMSE

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A climatology of wind sea and swell waves along the Canary eastern boundary current area, from west Iberia to Mauritania, is presented. The study is based on the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis ERA-Interim. The wind regime along the Canary Current, along west Iberia and north-west Africa, varies significantly from winter to summer. High summer wind speeds generate high wind sea waves, particularly along the coasts of Morocco and Western Sahara. Lower winter wind speeds, along with stronger extratropical storms crossing the North Atlantic sub-basin up north lead to a predominance of swell waves in the area during from December to February. In summer, the coast parallel wind interacts with the coastal headlands, increasing the wind speed and the locally generated waves. The spatial patterns of the wind sea or swell regional wave fields are shown to be different from the open ocean, due to coastal geometry, fetch dimensions, and island sheltering.

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Section: Wind Sea and Swell Wave Heights And Periodsmentioning

confidence: 99%

Seasonal Variability of Wind Sea and Swell Waves Climate along the Canary Current: The Local Wind Effect

Semedo

2018

JMSE

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“…the discussion above. Mun˜oz and Garreaud (2005), Garreaud and Mun˜oz (2005) and Jiang et al (2010) have documented the existence and dynamics of the Chilean CLLJ by using mesoscale modelling for particular CLLJ episodes.…”

Section: The South-american Coastal Jetmentioning

confidence: 99%

Global distribution and seasonal variability of coastal low-level jets derived from ERA-Interim reanalysis

Ranjha

Svensson

Tjernström

et al. 2013

Tellus A: Dynamic Meteorology and Oceanography

157

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A B S T R A C TA low-level wind maximum is often found over the oceans near many coasts around the world. These Coastal Low-Level Jets (CLLJs) play an important role in the coastal weather and have significant impacts on regional climate and ecology as well as on a number of human activities. The presence of CLLJs is related to various local circumstances such as land-sea temperature contrasts, upwelling, coastal terrain, orientation of the coast, and so on, but also to the large-scale atmospheric dynamics. This makes studies of CLLJs not only interesting but also challenging. In this study, based on ERA-Interim reanalysis data, the global distribution, spatiotemporal structure and the seasonal variability of CLLJs are documented. Seasonal data from 1980 to 2011 are used to identify areas where CLLJs are frequently found in the lowest 2 km, following criteria based on the vertical profiles of wind speed and temperature. The results are analysed to highlight the fundamental aspects and distinctive features of the CLLJs across the globe, including their occurrence rate, jet height, maximum wind speed and horizontal extent. Global maps of CLLJs are constructed for the summer and winter seasons. The west coasts of North America, the Iberian Peninsula, north-western Africa and the south-eastern coast of the Arabian Peninsula make up the Northern Hemispheric CLLJ regions, while the west coasts of South America, Australia, and southern Africa comprise the South Hemispheric equivalents. The existence and characteristics of CLLJs along the southern coast of Oman and the western coast of the Iberian Peninsula regions are also discussed, not fully envisaged before in the context of CLLJs. The highest occurrence of CLLJs is found during the summer in both hemispheres, and the coast of Oman has the globally highest CLLJ frequency, with also the highest maximum wind speeds. The most commonly found CLLJ has a maximum wind speed between 9 and 15 m s(1 , and occurs at heights between 500 and 700 m a.s.l.

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“…(see Means 1952, Hoecker 1963, Bonner 1968, Hoxit 1975, and references therein). Most of the initial focus was on the GPLLJ but the past couple of decades have seen a dramatic growth of interest in other LLJs around the globe (Vera et al, 2006;Jiang et al, 2010;Rife et al, 2010; and references therein).…”

Section: General Motivationmentioning

confidence: 99%

“…The coastal jets strongly influence the weather patterns and radiation budgets of the regions and lead to intense oceanic coastal upwelling. This upwelling is a vital component of the coastal economies and leads to rich marine ecosystems (Jiang et al 2010). The California coastal LLJ (CCLLJ) has been the subject of many studies while the Chilean Low-Level Coastal Jet (CLLCJ) has received less attention.…”

Section: 2mentioning

confidence: 99%

A Theory of Topographically Bound Balanced Motions and Application to Atmospheric Low-Level Jets

Silvers

Schubert

2012

Journal of the Atmospheric Sciences

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The response of a stratified fluid to forcing from the lower boundary is studied both analytically and numerically. The lower boundary forces a flow field through orographic obstacles and potential vorticity anomalies. It is argued that these mechanisms contribute to the maintenance of low-level jets (LLJs) that are observed regularly in the vicinity of the Rocky Mountains and the Andes. Low-level jets function as one of the primary mechanisms through which topography and surface heating influence regional and global climates.On the f -plane a horizontal transform of the governing equation for potential vorticity leads to a vertical structure equation that is solved using Green's functions. On the sphere a vertical transform of this system leads to a horizontal structure equation that is solved using spheroidal harmonics. These analytic solutions lead to a conceptually simple picture of the fluid response to forcing. However, these derivations only lead to closed analytic solutions for the case of an isentropic lower boundary. When the lower boundary is not isentropic a massless layer must be included in the domain and the solution is then found iteratively. For the cases including a massless layer the system is approximated using finite differences and solved with an over-relaxation procedure.Solutions are presented for the geostrophically balanced, steady response of the fluid to three idealized lower boundaries. An isentropic ridge is studied to determine the role non-heated orography plays on the wind field. Then a flat heated lower boundary and a non-isentropic ridge are ii studied. The cases with a heated lower surface result in a cyclonic wind field that is anchored over the topography. Observations show a prominent cyclonic wind field centered on both the Rocky Mountains and the Andes. The idealized cases studied in this work allow for the examination of fluid systems analogous to the Great Plains LLJ and the South American LLJ. Both the mean behavior of these jets and their variability have important climatological and economic impacts on the plains regions of North and South America.

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Some Insights into the Characteristics and Dynamics of the Chilean Low-Level Coastal Jet

Cited by 31 publications

References 32 publications

Seasonal Variability of Wind Sea and Swell Waves Climate along the Canary Current: The Local Wind Effect

Seasonal Variability of Wind Sea and Swell Waves Climate along the Canary Current: The Local Wind Effect

Global distribution and seasonal variability of coastal low-level jets derived from ERA-Interim reanalysis

A Theory of Topographically Bound Balanced Motions and Application to Atmospheric Low-Level Jets

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