The stratospheric quasi‐biennial oscillation in the NCEP reanalyses: Climatological structures

Huesmann, Amihan S.; Hitchman, Matthew H.

doi:10.1029/2001jd900031

Cited by 89 publications

(100 citation statements)

References 64 publications

(35 reference statements)

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“…The data are indexed by calculating the vertical wind shear between 50 and 70 hPa using the zonally and monthly averaged zonal wind data, as in work by Huesmann and Hitchman [2001]. This index is known to represent the QBO better than radiosonde observations at a single station (e.g., Singapore station).…”

Section: Datamentioning

confidence: 99%

Influence of stratospheric quasi‐biennial oscillation on tropical cyclone tracks in the western North Pacific

Kim

Jeong

et al. 2009

Geophysical Research Letters

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[1] The possible influence of the stratospheric quasibiennial oscillation (QBO) on tropical cyclone (TC) passages in the western North Pacific (WNP) is examined using TC data recorded by the Tokyo Typhoon Center and the QBO index derived from reanalysis data. The influence is observed to be significant. The number of TCs approaching the East China Sea is large during the westerly phase of the QBO; however, during the easterly phase, the number of TCs approaching the eastern offshore of Japan is large. This difference in the TC tracks is found to be related to the background flow change associated with the QBO. However, the total number of TC events over the WNP and the sum of the number of TCs approaching the aforementioned two regions appear to be unrelated to the QBO phases. Citation:

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Section: Datamentioning

confidence: 99%

Influence of stratospheric quasi‐biennial oscillation on tropical cyclone tracks in the western North Pacific

Kim

Jeong

et al. 2009

Geophysical Research Letters

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“…For the dynamic aspect, we chose zonal wind and temperature. They show pronounced QBO imprints that are well understood (Plumb and Bell, 1982;Huesmann and Hitchman, 2001;Baldwin et al, 2001). Regarding trace gases, we restrict ourselves to the discussion of ozone.…”

Section: Introductionmentioning

confidence: 99%

Net effect of the QBO in a chemistry climate model

Punge

Giorgetta

2008

Atmos. Chem. Phys.

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Abstract. The quasi-biennial oscillation (QBO) of zonal wind is a prominent mode of variability in the tropical stratosphere. It affects not only the meridional circulation and temperature over a wide latitude range but also the transport and chemistry of trace gases such as ozone. Compared to a QBO less circulation, the long-term climatological means of these quantities are also different. These climatological net effects of the QBO can be studied in general circulation models that extend into the middle atmosphere and have a chemistry and transport component, so-called Chemistry Climate Models (CCMs). In this work we show that the CCM MAECHAM4-CHEM can reproduce the observed QBO variations in temperature and ozone mole fractions when nudged towards observed winds. In particular, it is shown that the QBO signal in transport of nitrogen oxides NO x plays an important role in reproducing the observed ozone QBO, which features a phase reversal slightly below the level of maximum of the ozone mole fraction in the tropics. We then compare two 20-year experiments with the MAECHAM4-CHEM model that differ by including or not including the QBO. The mean wind fields differ between the two model runs, especially during summer and fall seasons in both hemispheres. The differences in the wind field lead to differences in the meridional circulation, by the same mechanism that causes the QBO's secondary meridional circulation, and thereby affect mean temperatures and the mean transport of tracers. In the tropics, the net effect on ozone is mostly due to net differences in upwelling and, higher up, the associated temperature change. We show that a net surplus of up to 15% in NO x in the tropics above 10 hPa in the experiment that includes the QBO does not lead to significantly different volume mixing ratios of ozone. We also note a slight increase in the southern vortex strength as well as earlier vortex formation in northern Correspondence to: H. J. Punge (heinzjuergen.punge@zmaw.de) winter. Polar temperatures differ accordingly. Differences in the strength of the Brewer-Dobson circulation and in further trace gas concentrations are analysed. Our findings underline the importance of a representation of the QBO in CCMs.

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“…From the power spectrum and lag-regressions of diverse meteorological variables, we found that the 2-3 year frequency band is similar to the QBO in its spatial structure and time evolution, as expected from its period (Huesmann and Hitchmann, 2001). Needless to say the stratospheric QBO in the lower stratosphere, the same frequency component shows a large variability in the lower troposphere specific humidity over the tropics and in the geopotential values (not shown) in the higher latitudes near the North Pole.…”

Section: Resultsmentioning

confidence: 98%

The characteristics of the band‐pass filtered time series of the zonal averages of monthly mean values based on ERA‐40 reanalysis

Lim

Shim

Suh

et al. 2008

Atmospheric Science Letters

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By band-passing the European Center reanalysis monthly mean values, we examined the frequency components of 2-3 years in height, latitude, and time domains. In the lower stratosphere, these frequencies have the typical shape of a stratospheric quasi-biennial oscillation (QBO). We also found significant power of the same frequency components of specific humidity near the surface over the tropics, which can be regarded as an evidence of the effects of the QBO on the lower troposphere. Such variation of specific humidity might be caused by a change of the mid-latitude branch of the Hadley circulation instead of direct control through the equatorial upper troposphere.

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The stratospheric quasi‐biennial oscillation in the NCEP reanalyses: Climatological structures

Abstract: Abstract. Global quasi-biennial variation in the lower stratosphere and tropopause region is studied using 41 years

Cited by 89 publications

References 64 publications

Influence of stratospheric quasi‐biennial oscillation on tropical cyclone tracks in the western North Pacific

Influence of stratospheric quasi‐biennial oscillation on tropical cyclone tracks in the western North Pacific

Net effect of the QBO in a chemistry climate model

The characteristics of the band‐pass filtered time series of the zonal averages of monthly mean values based on ERA‐40 reanalysis

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