Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer
Abstract The pronounced summertime quasi‐biweekly oscillation (QBWO) in the tropical northwestern Pacific usually originates from equatorial convective anomalies (ECAs) in the western Pacific. In this study, ECAs in relation to the QBWO are investigated in terms of the equatorial moisture dynamics....
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2020GL090929 |
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| author | Kuiping Li Qin He Yang Yang Weidong Yu |
| author_facet | Kuiping Li Qin He Yang Yang Weidong Yu |
| author_sort | Kuiping Li |
| collection | DOAJ |
| description | Abstract The pronounced summertime quasi‐biweekly oscillation (QBWO) in the tropical northwestern Pacific usually originates from equatorial convective anomalies (ECAs) in the western Pacific. In this study, ECAs in relation to the QBWO are investigated in terms of the equatorial moisture dynamics. The results show that the development of ECAs is preconditioned by significant moisture anomalies associated with zonal moisture advection along the equator. Prior to initiation, an equatorially westward‐moving moisture precursor at a speed of approximately 5° longitude per day could be traced back to 140°W. A moisture budget analysis indicates that the successive westward movement of the moisture precursor is primarily due to the interaction between the zonal gradient of moisture anomalies and the mean easterly trade winds. The equatorial moisture dynamics likely maintain the quasi‐biweekly variability of ECAs regarding the QBWO in the tropical northwestern Pacific. |
| format | Article |
| id | doaj-art-dced188baf974102bb45d7962cfbcce2 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-dced188baf974102bb45d7962cfbcce22025-08-20T03:04:21ZengWileyGeophysical Research Letters0094-82761944-80072021-01-01482n/an/a10.1029/2020GL090929Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal SummerKuiping Li0Qin He1Yang Yang2Weidong Yu3First Institute of Oceanography Ministry of Natural Resources Qingdao ChinaFirst Institute of Oceanography Ministry of Natural Resources Qingdao ChinaFirst Institute of Oceanography Ministry of Natural Resources Qingdao ChinaSchool of Atmospheric Sciences Sun Yat‐Sen University Zhuhai Campus Zhuhai ChinaAbstract The pronounced summertime quasi‐biweekly oscillation (QBWO) in the tropical northwestern Pacific usually originates from equatorial convective anomalies (ECAs) in the western Pacific. In this study, ECAs in relation to the QBWO are investigated in terms of the equatorial moisture dynamics. The results show that the development of ECAs is preconditioned by significant moisture anomalies associated with zonal moisture advection along the equator. Prior to initiation, an equatorially westward‐moving moisture precursor at a speed of approximately 5° longitude per day could be traced back to 140°W. A moisture budget analysis indicates that the successive westward movement of the moisture precursor is primarily due to the interaction between the zonal gradient of moisture anomalies and the mean easterly trade winds. The equatorial moisture dynamics likely maintain the quasi‐biweekly variability of ECAs regarding the QBWO in the tropical northwestern Pacific.https://doi.org/10.1029/2020GL090929equatorial moisture dynamicsquasi‐biweekly oscillationtropical northwestern Pacific |
| spellingShingle | Kuiping Li Qin He Yang Yang Weidong Yu Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer Geophysical Research Letters equatorial moisture dynamics quasi‐biweekly oscillation tropical northwestern Pacific |
| title | Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer |
| title_full | Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer |
| title_fullStr | Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer |
| title_full_unstemmed | Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer |
| title_short | Equatorial Moisture Dynamics of the Quasi‐Biweekly Oscillation in the Tropical Northwestern Pacific During Boreal Summer |
| title_sort | equatorial moisture dynamics of the quasi biweekly oscillation in the tropical northwestern pacific during boreal summer |
| topic | equatorial moisture dynamics quasi‐biweekly oscillation tropical northwestern Pacific |
| url | https://doi.org/10.1029/2020GL090929 |
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