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El Niño Southern Oscillation- (ENSO) related anomaly patterns of monthly specific humidity (q), precipitable water content (PW) and temperature (T) over South America are analysed using the FORMOSAT-3/COSMIC mission data (August 2006–December 2013). The Global Positioning System radio occultation (GPS RO) technique provides high vertical resolution profiles of atmospheric properties (refractivity, density, temperature and water vapour pressure) with a global coverage under any weather condition. During the ENSO warm phase (or El Niño), positive PW anomalies are found over the equatorial Pacific Ocean, southeastern Brazil, Bolivia, Paraguay and northern Argentina. Negative anomalies are found in the northern part of South America, but covering a smaller area. During the ENSO cold phase (or La Niña), positive anomalies are found in the northern part of the continent whereas negative anomalies are found over the Amazon Basin region. A Morlet continuous wavelet transform analysis is applied to deseasonalized PW anomaly time series. Over the areas showing PW anomalies related to ENSO, main modes of oscillation between 35 and 38 months are found, similar to the main oscillation mode of the Oceanic Niño index. Consistent with previous studies, PW anomalies in almost all these areas show a general behaviour towards opposite signals during the opposite ENSO phases. q patterns show a linear (in phase with Oceanic Niño Index) response to ENSO along the equator below 8 km height. The Andes mountains separate positive (west) from negative (east) anomalies during El Niño (EN) events (reversing during LN). The higher q positive anomalies are found over the equatorial Pacific Ocean and over 60°–50°W, 35°–20°S during EN months. T patterns show positive anomalies in the whole tropical troposphere during EN months, with higher values over the equatorial Pacific, west of the Andes between 7 and 15 km height. © 2016 Royal Meteorological Society


Documento: Artículo
Título:ENSO-related moisture and temperature anomalies over South America derived from GPS radio occultation profiles
Autor:Llamedo, P.; Hierro, R.; de la Torre, A.; Alexander, P.
Filiación:Facultad de Ingeniería, Universidad Austral, Buenos Aires, Argentina
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Palabras clave:ENSO; FORMOSAT-3/COSMIC; precipitable water; South America; Atmospheric humidity; Atmospheric pressure; Atmospheric temperature; Global positioning system; Nickel; Oceanography; Time series analysis; Wavelet transforms; Continuous Wavelet Transform; ENSO; Equatorial Pacific Ocean; FORMOSAT-3/COSMIC; High vertical resolution; Precipitable water; Precipitable water content; South America; Climatology; air temperature; atmospheric moisture; COSMIC; El Nino-Southern Oscillation; FORMOSAT; GPS; precipitable water; temperature anomaly; South America
Página de inicio:268
Página de fin:275
Título revista:International Journal of Climatology
Título revista abreviado:Int. J. Climatol.


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---------- APA ----------
Llamedo, P., Hierro, R., de la Torre, A. & Alexander, P. (2017) . ENSO-related moisture and temperature anomalies over South America derived from GPS radio occultation profiles. International Journal of Climatology, 37(1), 268-275.
---------- CHICAGO ----------
Llamedo, P., Hierro, R., de la Torre, A., Alexander, P. "ENSO-related moisture and temperature anomalies over South America derived from GPS radio occultation profiles" . International Journal of Climatology 37, no. 1 (2017) : 268-275.
---------- MLA ----------
Llamedo, P., Hierro, R., de la Torre, A., Alexander, P. "ENSO-related moisture and temperature anomalies over South America derived from GPS radio occultation profiles" . International Journal of Climatology, vol. 37, no. 1, 2017, pp. 268-275.
---------- VANCOUVER ----------
Llamedo, P., Hierro, R., de la Torre, A., Alexander, P. ENSO-related moisture and temperature anomalies over South America derived from GPS radio occultation profiles. Int. J. Climatol. 2017;37(1):268-275.