Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport
The low level jet (LLJ) east of the Andes in South America plays a key role in the transport of heat and water vapour from tropical to subtropical latitudes. It also plays a major role in the regional transport of pollutants and biological matter. This study examines the main spatial variability mod...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v35_n14_p4126_Castaneda http://hdl.handle.net/20.500.12110/paper_08998418_v35_n14_p4126_Castaneda |
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paper:paper_08998418_v35_n14_p4126_Castaneda2023-06-08T15:49:44Z Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport Ulke, Ana Graciela Biomass burning Principal component hybrid analysis Regional transport South American Low Level Jet Atmospheric humidity Atmospheric movements Climate change Moisture Pollution Atmospheric circulation Atmospheric conditions Biomass-burning Geo-potential heights Hybrid analysis Japan meteorological agencies Low level jet Regional transport Principal component analysis biomass burning geopotential humidity jet stream potential temperature principal component analysis spatial variation wind Andes La Plata Basin The low level jet (LLJ) east of the Andes in South America plays a key role in the transport of heat and water vapour from tropical to subtropical latitudes. It also plays a major role in the regional transport of pollutants and biological matter. This study examines the main spatial variability modes of the LLJ whose exit area reaches the La Plata Basin with no precipitation associated (which would remove aerosols) - Chaco Jet 1 (CJ1). The events were identified by applying the modified Bonner's criteria on the 850 and 700 hPa wind fields of the period 2001-2005 from GDAS (NCEP). With the help of an hybrid approach to Principal Component Analysis T-mode applied on the JRA-25 Reanalysis from the Japan Meteorological Agency, the main spatial patterns were identified during CJ1 episodes. Selected variables are geopotential height, specific humidity, equivalent potential temperature and the zonal and meridional wind components at 850 hPa. The first two PC components explained 35.64% of the variance. The significant fields show the entrance of the CJ1 to high (first PC) and middle (second PC) latitudes. The first component, with an explained variance of 21.1%, identifies episodes of moisture transport into high latitudes, and an intense flow north of 40°S. To the south, the most noticeable features for this component are moister conditions and weaker winds over Patagonia. The second component describes the situations where the flow turns towards the Atlantic Ocean at mid-latitudes, causing moisture to peak over the province of Buenos Aires and the north of Patagonia; with a stronger and more zonally oriented flow at high latitudes. The present analysis contributes to better understand the atmospheric circulation associated with CJ1 episodes and its implications on the regional transport of heat, moisture, pollutants and biological matter into La Plata Basin. © 2015 Royal Meteorological Society. Fil:Ulke, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v35_n14_p4126_Castaneda http://hdl.handle.net/20.500.12110/paper_08998418_v35_n14_p4126_Castaneda |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biomass burning Principal component hybrid analysis Regional transport South American Low Level Jet Atmospheric humidity Atmospheric movements Climate change Moisture Pollution Atmospheric circulation Atmospheric conditions Biomass-burning Geo-potential heights Hybrid analysis Japan meteorological agencies Low level jet Regional transport Principal component analysis biomass burning geopotential humidity jet stream potential temperature principal component analysis spatial variation wind Andes La Plata Basin |
| spellingShingle |
Biomass burning Principal component hybrid analysis Regional transport South American Low Level Jet Atmospheric humidity Atmospheric movements Climate change Moisture Pollution Atmospheric circulation Atmospheric conditions Biomass-burning Geo-potential heights Hybrid analysis Japan meteorological agencies Low level jet Regional transport Principal component analysis biomass burning geopotential humidity jet stream potential temperature principal component analysis spatial variation wind Andes La Plata Basin Ulke, Ana Graciela Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| topic_facet |
Biomass burning Principal component hybrid analysis Regional transport South American Low Level Jet Atmospheric humidity Atmospheric movements Climate change Moisture Pollution Atmospheric circulation Atmospheric conditions Biomass-burning Geo-potential heights Hybrid analysis Japan meteorological agencies Low level jet Regional transport Principal component analysis biomass burning geopotential humidity jet stream potential temperature principal component analysis spatial variation wind Andes La Plata Basin |
| description |
The low level jet (LLJ) east of the Andes in South America plays a key role in the transport of heat and water vapour from tropical to subtropical latitudes. It also plays a major role in the regional transport of pollutants and biological matter. This study examines the main spatial variability modes of the LLJ whose exit area reaches the La Plata Basin with no precipitation associated (which would remove aerosols) - Chaco Jet 1 (CJ1). The events were identified by applying the modified Bonner's criteria on the 850 and 700 hPa wind fields of the period 2001-2005 from GDAS (NCEP). With the help of an hybrid approach to Principal Component Analysis T-mode applied on the JRA-25 Reanalysis from the Japan Meteorological Agency, the main spatial patterns were identified during CJ1 episodes. Selected variables are geopotential height, specific humidity, equivalent potential temperature and the zonal and meridional wind components at 850 hPa. The first two PC components explained 35.64% of the variance. The significant fields show the entrance of the CJ1 to high (first PC) and middle (second PC) latitudes. The first component, with an explained variance of 21.1%, identifies episodes of moisture transport into high latitudes, and an intense flow north of 40°S. To the south, the most noticeable features for this component are moister conditions and weaker winds over Patagonia. The second component describes the situations where the flow turns towards the Atlantic Ocean at mid-latitudes, causing moisture to peak over the province of Buenos Aires and the north of Patagonia; with a stronger and more zonally oriented flow at high latitudes. The present analysis contributes to better understand the atmospheric circulation associated with CJ1 episodes and its implications on the regional transport of heat, moisture, pollutants and biological matter into La Plata Basin. © 2015 Royal Meteorological Society. |
| author |
Ulke, Ana Graciela |
| author_facet |
Ulke, Ana Graciela |
| author_sort |
Ulke, Ana Graciela |
| title |
Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| title_short |
Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| title_full |
Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| title_fullStr |
Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| title_full_unstemmed |
Analysis of atmospheric conditions associated to CHACO events of the Low Level Jet East of the Andes and their implications for regional transport |
| title_sort |
analysis of atmospheric conditions associated to chaco events of the low level jet east of the andes and their implications for regional transport |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v35_n14_p4126_Castaneda http://hdl.handle.net/20.500.12110/paper_08998418_v35_n14_p4126_Castaneda |
| work_keys_str_mv |
AT ulkeanagraciela analysisofatmosphericconditionsassociatedtochacoeventsofthelowleveljeteastoftheandesandtheirimplicationsforregionaltransport |
| _version_ |
1768542226266193920 |