Interdecadal Variations in the Walker Circulation and Its Connection to Inhomogeneous Air Temperature Changes from 1961–2012
| العنوان: | Interdecadal Variations in the Walker Circulation and Its Connection to Inhomogeneous Air Temperature Changes from 1961–2012 |
|---|---|
| المؤلفون: | Shujuan Hu, Guolin Feng, Xiaoya Hou, Jianbo Cheng |
| المصدر: | Atmosphere, Vol 9, Iss 12, p 469 (2018) Atmosphere Volume 9 Issue 12 |
| بيانات النشر: | MDPI AG, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Tropical pacific, Atmospheric Science, 010504 meteorology & atmospheric sciences, Atmospheric circulation, Weather and climate, novel index, Environmental Science (miscellaneous), lcsh:QC851-999, 010502 geochemistry & geophysics, interdecadal variations, inhomogeneous air temperature changes, 01 natural sciences, Walker circulation, 3P-DGAC method, Climatology, Air temperature, Stream function, Environmental science, lcsh:Meteorology. Climatology, Tropopause, Intensity (heat transfer), 0105 earth and related environmental sciences |
| الوصف: | The tropical Pacific Walker circulation (PWC) is fundamentally important to global atmospheric circulation, and changes in it have a vital influence on the weather and climate systems. A novel three-pattern decomposition of a global atmospheric circulation (3P-DGAC) method, which can be used to investigate atmospheric circulations including the PWC, was proposed in our previous study. Therefore, the present study aims to examine the capability of this 3P-DGAC method to acquire interdecadal variations in the PWC and its connection to inhomogeneous air temperature changes in the period from 1961&ndash 2012. Our findings reveal that interdecadal variations in the PWC, i.e., weakening (strengthening) between the periods 1961&ndash 1974 and 1979&ndash 1997 (1979&ndash 1997 and 1999&ndash 2012), can be observed using the zonal stream function (ZSF) derived from the 3P-DGAC method. Enhancement of the PWC is also associated with the strengthening and weakening of zonal circulations in the tropical Indian Ocean (IOC) and Atlantic (AOC), respectively, and vice versa, implying a connection between these zonal overturning circulations in the tropics. The interdecadal variations in the zonal circulations correspond well to inhomogeneous air temperature changes, i.e., an enhancement of the PWC is associated with a warming (cooling) of the air temperature from 1000 to 300 hPa in the western (mid&ndash eastern) Pacific Ocean and a cooling (warming) of the air temperature in the tropopause in the western (mid&ndash eastern) Pacific Ocean. Furthermore, a novel index for the PWC intensity based on air temperature is defined, and the capability of the novel index in representing the PWC intensity is evaluated. This novel index is potentially important for the prediction of the PWC by using dynamic equations derived from the 3P-DGAC method. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2073-4433 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1922f22be45304a661da8a79e9dc2d7f https://www.mdpi.com/2073-4433/9/12/469 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....1922f22be45304a661da8a79e9dc2d7f |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20734433 |
|---|