Scholarlink

<p>The response of the stratospheric Brewer–Dobson Circulation (BDC) to Quasi–Biennial Oscillation (QBO) is evaluated using a composite of QBO cycles from 1979 to 2021. In an attempt to delineate the response of the meridional circulation, the BDC metrics derived from 43 years of climatological reanalysis dataset from ERA5 are used. An enhancement in the wave breaking in the stratosphere is observed in the westward phase of QBO. This is reflected in an increased residual meridional transport. The modulation of BDC is more evident in the Northern Hemisphere, where the zonal wind structure is more responsive to QBO. The ozone mixing ratio observed from the Aura Microwave Limb Sounder shows well-marked QBO signatures in the lower and middle stratospheres. During the westward (eastward) QBO phase at 50 hPa, negative anomalies of 0.2 ppmv (positive, 0.2 ppmv) are observed over the tropical lower stratosphere. The water vapor is influenced by QBO at the stratospheric entry, where the cold point tropopause temperature is much lower in the westward phase of QBO, leading to a dry anomaly of 0.1 ppmv. The concentration changes lead the instantaneous radiative forcing to vary between 0.11 to 0.14 Wm<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="382_2025_7616_Article_IEq1.gif" Format="GIF" Height="11" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{-2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mo>-</mo> <mn>2</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation> during QBO phases.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The teleconnection between Brewer–Dobson circulation and Quasi–Biennial Oscillation: implications on ozone and water vapor distribution—a composite analysis

  • 期刊论文

  • 发表日期：

    2025年2月14日

查看全文
  • V. Veenus,
  • Siddarth Shankar Das

摘要

The response of the stratospheric Brewer–Dobson Circulation (BDC) to Quasi–Biennial Oscillation (QBO) is evaluated using a composite of QBO cycles from 1979 to 2021. In an attempt to delineate the response of the meridional circulation, the BDC metrics derived from 43 years of climatological reanalysis dataset from ERA5 are used. An enhancement in the wave breaking in the stratosphere is observed in the westward phase of QBO. This is reflected in an increased residual meridional transport. The modulation of BDC is more evident in the Northern Hemisphere, where the zonal wind structure is more responsive to QBO. The ozone mixing ratio observed from the Aura Microwave Limb Sounder shows well-marked QBO signatures in the lower and middle stratospheres. During the westward (eastward) QBO phase at 50 hPa, negative anomalies of 0.2 ppmv (positive, 0.2 ppmv) are observed over the tropical lower stratosphere. The water vapor is influenced by QBO at the stratospheric entry, where the cold point tropopause temperature is much lower in the westward phase of QBO, leading to a dry anomaly of 0.1 ppmv. The concentration changes lead the instantaneous radiative forcing to vary between 0.11 to 0.14 Wm \(^{-2}\) - 2 during QBO phases.