An Analysis of Tropical Cold-Point Tropopause Warming in 1999
Using reanalysis datasets, the warming of the tropical tropopause in 1999 and its evolution are investigated. It is found that there is a strong rate of increase in tropical cold-point tropopause temperature (CPTT) in June 1999, with negative CPTT anomalies before June (March-April-May) and large po...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2017/4572532 |
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| author | Yuanyuan Han Fei Xie Shiyan Zhang Ruhua Zhang Feiyang Wang Jiankai Zhang |
| author_facet | Yuanyuan Han Fei Xie Shiyan Zhang Ruhua Zhang Feiyang Wang Jiankai Zhang |
| author_sort | Yuanyuan Han |
| collection | DOAJ |
| description | Using reanalysis datasets, the warming of the tropical tropopause in 1999 and its evolution are investigated. It is found that there is a strong rate of increase in tropical cold-point tropopause temperature (CPTT) in June 1999, with negative CPTT anomalies before June (March-April-May) and large positive anomalies after June (July-August-September). Multiple linear regression analysis shows that deep convection, the quasi-biennial oscillation (QBO), and tropical upwelling associated with the Brewer-Dobson circulation (BDC) largely explain the variations of CPTT in 1999. Before June, enhanced deep convection resulting from increased sea surface temperature (SST) over the western Pacific and enhanced tropical upwelling of the BDC lead to a higher and colder tropopause. Those two factors explain 22% and 17% of the variance in CPTT, respectively. In June, the transformation of the east phase of QBO to the west phase contributes up to more than 50% of the variance in CPTT changes. After June, reduced tropical upwelling induced by weakened wave activity results in the warmer tropical tropopause temperatures to a large extent. |
| format | Article |
| id | doaj-art-582884cf16cd4e9f90835aacd17a2183 |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-582884cf16cd4e9f90835aacd17a21832025-02-03T01:25:55ZengWileyAdvances in Meteorology1687-93091687-93172017-01-01201710.1155/2017/45725324572532An Analysis of Tropical Cold-Point Tropopause Warming in 1999Yuanyuan Han0Fei Xie1Shiyan Zhang2Ruhua Zhang3Feiyang Wang4Jiankai Zhang5Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, ChinaState Key Laboratory of Earth Surface Processes and Resource Ecology and College of Global Change and Earth System Science, Beijing Normal University, Beijing, ChinaKey Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, ChinaKey Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, ChinaKey Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, ChinaKey Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, ChinaUsing reanalysis datasets, the warming of the tropical tropopause in 1999 and its evolution are investigated. It is found that there is a strong rate of increase in tropical cold-point tropopause temperature (CPTT) in June 1999, with negative CPTT anomalies before June (March-April-May) and large positive anomalies after June (July-August-September). Multiple linear regression analysis shows that deep convection, the quasi-biennial oscillation (QBO), and tropical upwelling associated with the Brewer-Dobson circulation (BDC) largely explain the variations of CPTT in 1999. Before June, enhanced deep convection resulting from increased sea surface temperature (SST) over the western Pacific and enhanced tropical upwelling of the BDC lead to a higher and colder tropopause. Those two factors explain 22% and 17% of the variance in CPTT, respectively. In June, the transformation of the east phase of QBO to the west phase contributes up to more than 50% of the variance in CPTT changes. After June, reduced tropical upwelling induced by weakened wave activity results in the warmer tropical tropopause temperatures to a large extent.http://dx.doi.org/10.1155/2017/4572532 |
| spellingShingle | Yuanyuan Han Fei Xie Shiyan Zhang Ruhua Zhang Feiyang Wang Jiankai Zhang An Analysis of Tropical Cold-Point Tropopause Warming in 1999 Advances in Meteorology |
| title | An Analysis of Tropical Cold-Point Tropopause Warming in 1999 |
| title_full | An Analysis of Tropical Cold-Point Tropopause Warming in 1999 |
| title_fullStr | An Analysis of Tropical Cold-Point Tropopause Warming in 1999 |
| title_full_unstemmed | An Analysis of Tropical Cold-Point Tropopause Warming in 1999 |
| title_short | An Analysis of Tropical Cold-Point Tropopause Warming in 1999 |
| title_sort | analysis of tropical cold point tropopause warming in 1999 |
| url | http://dx.doi.org/10.1155/2017/4572532 |
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