Analysis of the Equatorial Lower Stratosphere Quasi-Biennial Oscillation (QBO) Using ECMWF-Interim Reanalysis Data Set

Workshop and International Seminar on Science of Complex Natural Systems

Alsepan, Givo^1 ; Lubis, Sandro Wellyanto^2 ; Setiawan, Sonni^1

Department of Geophysics and Meteorology, Bogor Agricultural University (IPB), Indonesia^1

Physics of the Atmosphere, GEOMAR Helmoltz Centre for Ocean Research Kiel, Germany^2

关键词: Lower stratosphere;    Maximum amplitude;    Quasi-biennial oscillation;    Temperature anomaly;    Total column ozone;    Vertical motions;    Vertical shear;    Zonal-mean zonal winds;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/31/1/012032/pdf
DOI  :  10.1088/1755-1315/31/1/012032

来源: IOP

【 摘 要 】

The ERA-Interim data set from Europe Center for Medium Range Weather Forecasting (ECMWF) was used to quantitatively analyze the characteristic of equatorial quasi-biennial oscillation (QBO). Analysis of spatial and temporal of the data showed that the zonally symmetric easterly and westerly phase of QBO regimes alternate with period of ∼27.7 months. Based on Equivalent QBO Amplitude (EQA) method, the maximum amplitudes in zonal mean zonal wind (u), temperature (T), vertical shear (du/dz) and quadratic vertical shear (d2u/dz2) are ∼28.3 m/s, ∼3.4 K, ∼4.8 m/s/km, and ∼1.0 m/s/km2respectively. The amplitudes decay exponentially with a Gaussian distribution in latitude. The twofold-structure of QBO descends downward at rate of ∼1 km/month. The temperature anomaly can be used to analyze the characteristic of QBO which satisfies the thermal wind balance relation in the lower- stratosphere due to very small contribution of the mean meridional and vertical motion. Moreover, the concentration of the total column ozone (TCO) in the tropics is significantly influenced by QBO. During the westerly phase of QBO, the TCO is relatively increased in the lower-stratosphere, but decreased during the opposite phase.