South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment
Analysing tropopause variability is widely acknowledged to inform the understanding of global/regional warming. Tropopause variability studies are generally undertaken where radiosonde data abound. For the radiosonde data deficient South American continent, taking advantage of atmospheric remote sen...
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| Format: | Journal Article |
| Language: | English |
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PERGAMON-ELSEVIER SCIENCE LTD
2020
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| Online Access: | http://hdl.handle.net/20.500.11937/86608 |
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| author | Nascimento, A.A. Awange, Joseph Gonçalves, R.M. Khandu |
| author_facet | Nascimento, A.A. Awange, Joseph Gonçalves, R.M. Khandu |
| author_sort | Nascimento, A.A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Analysing tropopause variability is widely acknowledged to inform the understanding of global/regional warming. Tropopause variability studies are generally undertaken where radiosonde data abound. For the radiosonde data deficient South American continent, taking advantage of atmospheric remote sensing using Global Navigation Satellite Systems - Radio Occultation (GNSS-RO) could offer the means to understand its tropopause variability. In this study, 622,914 GNSS-RO measurements of Challenging Minisatellite Payload (CHAMP), Gravity Recovery and Climate Experiment (GRACE) and Constellation Observing System for Meteorology Ionosphere & Climate (FORMOSAT-3/COSMIC), from 2001 to 2017 are used to analyze the annual variability patterns of tropopause heights and temperatures over South America and its relation to global teleconnections. Firstly, the RO measurements are validated using atmospheric profiles for 54 radiosonde stations across the continent. The results show increased trend of 13.450 ± 39.577 m/dec for the tropopause height and a corresponding slow decrease in temperature of −0.021 ± 0.115 K/dec, both statistically insignificant (i.e., p-value test) at 95% of confidence level (two-tailed student's t-test). The first mode of PCA (Principal Component Analysis) of the tropopause anomalies (of temperatures and heights) present significant temporal correlation (at 95% confidence level) with the ENSO 1 + 2 (El Niño–Southern Oscillation) index (i.e., a correlation coefficient of 0.6). The South America tropopause, therefore, varies over time albeit with slow changes and trends. This contribution highlights the importance of its monitoring. |
| first_indexed | 2025-11-14T11:25:48Z |
| format | Journal Article |
| id | curtin-20.500.11937-86608 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:25:48Z |
| publishDate | 2020 |
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| recordtype | eprints |
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| spelling | curtin-20.500.11937-866082021-12-06T06:08:07Z South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment Nascimento, A.A. Awange, Joseph Gonçalves, R.M. Khandu Science & Technology Physical Sciences Geochemistry & Geophysics Meteorology & Atmospheric Sciences GNSS radio occultation Tropopause Teleconnections Climate variability South America CLIMATE-CHANGE TEMPERATURE TRENDS EL-NINO ATMOSPHERIC-TEMPERATURE UPPER TROPOSPHERE LA-NINA STRATOSPHERE HEIGHT IMPACTS CHAMP Analysing tropopause variability is widely acknowledged to inform the understanding of global/regional warming. Tropopause variability studies are generally undertaken where radiosonde data abound. For the radiosonde data deficient South American continent, taking advantage of atmospheric remote sensing using Global Navigation Satellite Systems - Radio Occultation (GNSS-RO) could offer the means to understand its tropopause variability. In this study, 622,914 GNSS-RO measurements of Challenging Minisatellite Payload (CHAMP), Gravity Recovery and Climate Experiment (GRACE) and Constellation Observing System for Meteorology Ionosphere & Climate (FORMOSAT-3/COSMIC), from 2001 to 2017 are used to analyze the annual variability patterns of tropopause heights and temperatures over South America and its relation to global teleconnections. Firstly, the RO measurements are validated using atmospheric profiles for 54 radiosonde stations across the continent. The results show increased trend of 13.450 ± 39.577 m/dec for the tropopause height and a corresponding slow decrease in temperature of −0.021 ± 0.115 K/dec, both statistically insignificant (i.e., p-value test) at 95% of confidence level (two-tailed student's t-test). The first mode of PCA (Principal Component Analysis) of the tropopause anomalies (of temperatures and heights) present significant temporal correlation (at 95% confidence level) with the ENSO 1 + 2 (El Niño–Southern Oscillation) index (i.e., a correlation coefficient of 0.6). The South America tropopause, therefore, varies over time albeit with slow changes and trends. This contribution highlights the importance of its monitoring. 2020 Journal Article http://hdl.handle.net/20.500.11937/86608 10.1016/j.jastp.2020.105379 English PERGAMON-ELSEVIER SCIENCE LTD restricted |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics Meteorology & Atmospheric Sciences GNSS radio occultation Tropopause Teleconnections Climate variability South America CLIMATE-CHANGE TEMPERATURE TRENDS EL-NINO ATMOSPHERIC-TEMPERATURE UPPER TROPOSPHERE LA-NINA STRATOSPHERE HEIGHT IMPACTS CHAMP Nascimento, A.A. Awange, Joseph Gonçalves, R.M. Khandu South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title | South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title_full | South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title_fullStr | South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title_full_unstemmed | South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title_short | South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment |
| title_sort | south america's tropopause variability in relation to global teleconnection (2001–2017): a gnss-radio occultation assessment |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics Meteorology & Atmospheric Sciences GNSS radio occultation Tropopause Teleconnections Climate variability South America CLIMATE-CHANGE TEMPERATURE TRENDS EL-NINO ATMOSPHERIC-TEMPERATURE UPPER TROPOSPHERE LA-NINA STRATOSPHERE HEIGHT IMPACTS CHAMP |
| url | http://hdl.handle.net/20.500.11937/86608 |