Trends in Monthly Tropopause Characteristics Observed over Taipei, Taiwan
This study presents monthly trends in the cold-point tropopause (CPT), calculated using three decades of radiosonde data from 1981 to 2010 over Taipei, Taiwan (25°01′N, 121°27′E). Multivariate regression analysis has been used to suppress the effect of natural variations, such as quasi-biennial osci...
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| Veröffentlicht in: | Journal of the atmospheric sciences 2014-04, Vol.71 (4), p.1323-1338 |
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| creator | Raman, M. Roja Chen, Wei-Nai |
| description | This study presents monthly trends in the cold-point tropopause (CPT), calculated using three decades of radiosonde data from 1981 to 2010 over Taipei, Taiwan (25°01′N, 121°27′E). Multivariate regression analysis has been used to suppress the effect of natural variations, such as quasi-biennial oscillation (QBO), ENSO, solar cycle, and volcanic eruptions. From the continuous time series, statistically insignificant heating and a decrease in the height of CPT are observed. However, the trends estimated using individual monthly time series revealed new features with statistically significant increasing trends in CPT temperature at a rate of approximately 0.03°C yr−1 and statistically significant decreasing trends in CPT height at a rate of approximately 4.7 m yr−1 during summer months. An enhanced heating rate in the upper troposphere along with a suppressed cooling rate in the lower stratosphere observed over Taipei might have caused the tropopause heating trend during summer. The possible relationship between tropopause trends and lower-stratospheric ozone is also examined. The seasonal and spatial variations in trends estimated using NCEP–Climate Forecast System Reanalysis (CFSR) data reveal the spatial heterogeneity in CPT temperature trends. Initial inspection of monthly trends in tropopause characteristics suggests that the estimation of tropopause trends using the continuous time series may not exactly represent the long-term variability of individual months or seasons. |
| doi_str_mv | 10.1175/JAS-D-13-0230.1 |
| format | Article |
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Roja ; Chen, Wei-Nai</creator><creatorcontrib>Raman, M. Roja ; Chen, Wei-Nai</creatorcontrib><description>This study presents monthly trends in the cold-point tropopause (CPT), calculated using three decades of radiosonde data from 1981 to 2010 over Taipei, Taiwan (25°01′N, 121°27′E). Multivariate regression analysis has been used to suppress the effect of natural variations, such as quasi-biennial oscillation (QBO), ENSO, solar cycle, and volcanic eruptions. From the continuous time series, statistically insignificant heating and a decrease in the height of CPT are observed. However, the trends estimated using individual monthly time series revealed new features with statistically significant increasing trends in CPT temperature at a rate of approximately 0.03°C yr−1 and statistically significant decreasing trends in CPT height at a rate of approximately 4.7 m yr−1 during summer months. An enhanced heating rate in the upper troposphere along with a suppressed cooling rate in the lower stratosphere observed over Taipei might have caused the tropopause heating trend during summer. The possible relationship between tropopause trends and lower-stratospheric ozone is also examined. The seasonal and spatial variations in trends estimated using NCEP–Climate Forecast System Reanalysis (CFSR) data reveal the spatial heterogeneity in CPT temperature trends. 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Roja</creatorcontrib><creatorcontrib>Chen, Wei-Nai</creatorcontrib><title>Trends in Monthly Tropopause Characteristics Observed over Taipei, Taiwan</title><title>Journal of the atmospheric sciences</title><description>This study presents monthly trends in the cold-point tropopause (CPT), calculated using three decades of radiosonde data from 1981 to 2010 over Taipei, Taiwan (25°01′N, 121°27′E). Multivariate regression analysis has been used to suppress the effect of natural variations, such as quasi-biennial oscillation (QBO), ENSO, solar cycle, and volcanic eruptions. From the continuous time series, statistically insignificant heating and a decrease in the height of CPT are observed. However, the trends estimated using individual monthly time series revealed new features with statistically significant increasing trends in CPT temperature at a rate of approximately 0.03°C yr−1 and statistically significant decreasing trends in CPT height at a rate of approximately 4.7 m yr−1 during summer months. An enhanced heating rate in the upper troposphere along with a suppressed cooling rate in the lower stratosphere observed over Taipei might have caused the tropopause heating trend during summer. The possible relationship between tropopause trends and lower-stratospheric ozone is also examined. The seasonal and spatial variations in trends estimated using NCEP–Climate Forecast System Reanalysis (CFSR) data reveal the spatial heterogeneity in CPT temperature trends. 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Roja ; Chen, Wei-Nai</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c343t-245c02049a7f4d4d2e095302d2896a1ebd9c65dae95f7d4f5f784babd21942ca3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Climate change</topic><topic>Climate system</topic><topic>Cold</topic><topic>Cooling</topic><topic>Decades</topic><topic>El Nino</topic><topic>Heating</topic><topic>Heterogeneity</topic><topic>Meteorology</topic><topic>Regression analysis</topic><topic>Stratosphere</topic><topic>Studies</topic><topic>Summer</topic><topic>Temperature</topic><topic>Time series</topic><topic>Trends</topic><topic>Tropopause</topic><topic>Troposphere</topic><topic>Volcanic eruptions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Raman, M. 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Roja</au><au>Chen, Wei-Nai</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Trends in Monthly Tropopause Characteristics Observed over Taipei, Taiwan</atitle><jtitle>Journal of the atmospheric sciences</jtitle><date>2014-04-01</date><risdate>2014</risdate><volume>71</volume><issue>4</issue><spage>1323</spage><epage>1338</epage><pages>1323-1338</pages><issn>0022-4928</issn><eissn>1520-0469</eissn><coden>JAHSAK</coden><abstract>This study presents monthly trends in the cold-point tropopause (CPT), calculated using three decades of radiosonde data from 1981 to 2010 over Taipei, Taiwan (25°01′N, 121°27′E). Multivariate regression analysis has been used to suppress the effect of natural variations, such as quasi-biennial oscillation (QBO), ENSO, solar cycle, and volcanic eruptions. From the continuous time series, statistically insignificant heating and a decrease in the height of CPT are observed. However, the trends estimated using individual monthly time series revealed new features with statistically significant increasing trends in CPT temperature at a rate of approximately 0.03°C yr−1 and statistically significant decreasing trends in CPT height at a rate of approximately 4.7 m yr−1 during summer months. An enhanced heating rate in the upper troposphere along with a suppressed cooling rate in the lower stratosphere observed over Taipei might have caused the tropopause heating trend during summer. The possible relationship between tropopause trends and lower-stratospheric ozone is also examined. The seasonal and spatial variations in trends estimated using NCEP–Climate Forecast System Reanalysis (CFSR) data reveal the spatial heterogeneity in CPT temperature trends. Initial inspection of monthly trends in tropopause characteristics suggests that the estimation of tropopause trends using the continuous time series may not exactly represent the long-term variability of individual months or seasons.</abstract><cop>Boston</cop><pub>American Meteorological Society</pub><doi>10.1175/JAS-D-13-0230.1</doi><tpages>16</tpages><oa>free_for_read</oa></addata></record> |
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| source | American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Climate change Climate system Cold Cooling Decades El Nino Heating Heterogeneity Meteorology Regression analysis Stratosphere Studies Summer Temperature Time series Trends Tropopause Troposphere Volcanic eruptions |
| title | Trends in Monthly Tropopause Characteristics Observed over Taipei, Taiwan |
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