Climatological Characterization of Puelche Winds down the Western Slope of the Extratropical Andes Mountains Using the NCEP Climate Forecast System Reanalysis
Uloženo v:
| Název: | Climatological Characterization of Puelche Winds down the Western Slope of the Extratropical Andes Mountains Using the NCEP Climate Forecast System Reanalysis |
|---|---|
| Autoři: | Montecinos, Aldo, Muñoz, Ricardo C., Oviedo, Stephanie, Martínez, Andrés, Villagrán, Víctor |
| Zdroj: | Journal Of Applied Meteorology And Climatology Conicyt_qa ANID instacron:ANID |
| Informace o vydavateli: | American Meteorological Society, 2017. |
| Rok vydání: | 2017 |
| Témata: | Atmospheric circulation, Ageostrophic circulations, Regional effects, 13. Climate action, Orographic effects, Mesoscale systems, 14. Life underwater, 15. Life on land, Downslope winds, 01 natural sciences, 0105 earth and related environmental sciences |
| Popis: | The existence of strong easterly winds down the western slope of the south-central Andes in Chile, locally known as Puelche winds, has been known by the meteorological community since at least the mid-twentieth century. However, this is the first time that a climatological characterization of them is presented. The analysis is based on 36 yr of daily CFSR–NCEP reanalyzed data, validated by surface weather observations. Puelche winds are present all year round. The main synoptic-scale forcing of Puelche winds in south-central Chile is the passage of cold anticyclonic systems across the Andes Mountains. As these systems progress into the South American continent, a zonal surface circulation crossing from Argentina (upslope) to Chile (downslope) develops. Unlike terral and raco, other foehnlike winds at subtropical latitudes in Chile, the Puelche winds are forced by both meridional and zonal pressure gradients. Presumably, the smaller altitude of the Andes Mountains south of 35°S allows the air crossing from east to west in response to the presence of the migratory high pressure system over Argentina. As in other places where foehnlike winds develop, the warming extends far from places where the Puelche is actually observed, that is, to the west of the Andes into the surface at the coastal and the central depression areas. This “foehn clearance” is the result of cloudless sky and drier atmosphere that would allow an increase in the solar radiation reaching the surface and a subsequent warming of the near-surface air. The foehn clearance also drives an enhanced nighttime cooling, especially on the days after the onset of the Puelche event. |
| Druh dokumentu: | Article |
| Popis souboru: | application/pdf |
| ISSN: | 1558-8432 1558-8424 |
| DOI: | 10.1175/jamc-d-16-0289.1 |
| Přístupová URL adresa: | https://journals.ametsoc.org/jamc/article-pdf/56/3/677/3591781/jamc-d-16-0289_1.pdf http://ui.adsabs.harvard.edu/abs/2017JApMC..56..677M/abstract https://journals.ametsoc.org/view/journals/apme/56/3/jamc-d-16-0289.1.xml http://repositorio.conicyt.cl/handle/10533/219118 https://repositorio.uchile.cl/handle/2250/168928 https://repositorio-qa.anid.cl/handle/10533/219118 |
| Rights: | implied-oa CC BY NC ND |
| Přístupové číslo: | edsair.doi.dedup.....db2cb87afb1ecc5882c3b8a03676baf8 |
| Databáze: | OpenAIRE |
Full Text Finder 
Nájsť tento článok vo Web of Science | Abstrakt: | The existence of strong easterly winds down the western slope of the south-central Andes in Chile, locally known as Puelche winds, has been known by the meteorological community since at least the mid-twentieth century. However, this is the first time that a climatological characterization of them is presented. The analysis is based on 36 yr of daily CFSR–NCEP reanalyzed data, validated by surface weather observations. Puelche winds are present all year round. The main synoptic-scale forcing of Puelche winds in south-central Chile is the passage of cold anticyclonic systems across the Andes Mountains. As these systems progress into the South American continent, a zonal surface circulation crossing from Argentina (upslope) to Chile (downslope) develops. Unlike terral and raco, other foehnlike winds at subtropical latitudes in Chile, the Puelche winds are forced by both meridional and zonal pressure gradients. Presumably, the smaller altitude of the Andes Mountains south of 35°S allows the air crossing from east to west in response to the presence of the migratory high pressure system over Argentina. As in other places where foehnlike winds develop, the warming extends far from places where the Puelche is actually observed, that is, to the west of the Andes into the surface at the coastal and the central depression areas. This “foehn clearance” is the result of cloudless sky and drier atmosphere that would allow an increase in the solar radiation reaching the surface and a subsequent warming of the near-surface air. The foehn clearance also drives an enhanced nighttime cooling, especially on the days after the onset of the Puelche event. |
|---|---|
| ISSN: | 15588432 15588424 |
| DOI: | 10.1175/jamc-d-16-0289.1 |