Polar vortex dynamics during spring and fall diagnosed using trace gas observations from the Atmospheric Trace Molecule Spectroscopy instrument

Manney, G. L.; Michelsen, Hope A.; Santee, M. L.; Gunson, M. R.; Irion, F. W.; Roche, A. E.; Livesey, N. J.

doi:10.1029/1999jd900317

Cited by 78 publications

(98 citation statements)

References 76 publications

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“…Because of the asymmetry and variability of the winter polar vortices, ACE-FTS measurements provide extensive coverage of conditions in and around the polar vortices. Very low CH 4 values in the vortices and very strong gradients across the vortex edge are the signature of strong, confined descent in the vortex (Schoeberl, et al, 1992 and references therein;Schoeberl et al, 1995;Manney et al, 1999); the close correspondence of the strong CH 4 gradient region in ACE-FTS with the evolution and position of the vortex-edge PV contours indicates good consistency of the ACE-FTS data with the meteorological fields.…”

Section: Statistical Analysesmentioning

confidence: 95%

“…The ACE and HALOE "Derived Meteorological Products" (DMPs) from the Met Office assimilated meteorological analyses are used to provide EqL/θ; these, and the mapping versus EqL, are described in detail by Manney et al (2007). The mapping in EqL/θ is done as described by Manney et al (1999Manney et al ( , 2001) by taking weighted averages of the measurements around each EqL/θ gridpoint; in addition to being weighted by the "distance" (in EqL,θ) from the gridpoint, the average is weighted by the uncertainty value associated with the measurement point. The EqL grid spacing used is 5 • , and the θ grid spacing corresponds to a 3-km grid, comparable to the vertical resolution of ACE-FTS and HALOE CH 4 profiles.…”

Section: Statistical Analysesmentioning

confidence: 99%

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Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere

Mazière

Vigouroux²,

Bernath³

et al. 2008

Atmos. Chem. Phys.

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Abstract. The ACE-FTS (Atmospheric Chemistry Experiment -Fourier Transform Spectrometer) solar occultation instrument that was launched onboard the Canadian SCISAT-1 satellite in August 2003 is measuring vertical profiles from the upper troposphere to the lower mesosphere for a large number of atmospheric constituents. Methane is one of the key species. The version v2.2 data of the ACE-FTS CH 4 data have been compared to correlative satellite, balloonborne and ground-based Fourier transform infrared remote sensing data to assess their quality. The comparison results indicate that the accuracy of the data is within 10% in the upper troposphere -lower stratosphere, and within 25% in the middle and higher stratosphere up to the lower mesosphere (<60 km). The observed differences are generally consistent with reported systematic uncertainties. ACE-FTS is also shown to reproduce the variability of methane in the stratosphere and lower mesosphere.

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Section: Statistical Analysesmentioning

confidence: 95%

Section: Statistical Analysesmentioning

confidence: 99%

Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere

Mazière

Vigouroux²,

Bernath³

et al. 2008

Atmos. Chem. Phys.

Self Cite

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“…An alternative approach is to average data in the more physically based quasi-Lagrangian coordinate system of equivalent latitude (EqLat) versus potential temperature (). This coordinate system roughly captures the motion of air parcel ensembles and is widely used by the stratospheric chemistry and dynamics community in studies of polar processes (e.g., Butchart and Remsberg, 1986;Manney et al, 1999). Figure 17 shows the EqLat/ cross-sectional representations of the 12-year average, monthly zonal mean Antarctic PSC occurrence frequency, cloud-free MLS HNO 3 and H 2 O, MERRA-2 T, and T-T NAT .…”

Section: Zonal Mean and Geographical Distributions Of Psc Occurrencementioning

confidence: 99%

Polar stratospheric cloud climatology based on CALIPSO spaceborne lidar measurements from 2006–2017

Pitts¹,

Poole²,

Gonzalez³

2018

Preprint

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“…Equivalent latitude (EqL) is a common vortex-centered coordinate used in studies of the stratosphere (e.g., Butchart and Remsberg, 1986;Manney et al, 1999, and references therein). This coordinate is also useful as a geophysically based coordinate in the UTLS (e.g., Santee et al, 2011), although interpretation becomes more complicated in this context (e.g., Manney et al, 2011;Pan et al, 2012).…”

Section: Ozone Time Series In Equivalent Latitude Coordinatesmentioning

confidence: 99%

Assessment of upper tropospheric and stratospheric water vapor and ozone in reanalyses as part of S-RIP

et al. 2017

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Abstract. Reanalysis data sets are widely used to understand atmospheric processes and past variability, and are often used to stand in as "observations" for comparisons with climate model output. Because of the central role of water vapor (WV) and ozone (O 3 ) in climate change, it is important to understand how accurately and consistently these species are represented in existing global reanalyses. In this paper, we present the results of WV and O 3 intercomparisons that have been performed as part of the SPARC (Stratospheretroposphere Processes and their Role in Climate) Reanalysis Intercomparison Project (S-RIP). The comparisons cover a range of timescales and evaluate both inter-reanalysis and observation-reanalysis differences. We also provide a systematic documentation of the treatment of WV and O 3 in current reanalyses to aid future research and guide the interpretation of differences amongst reanalysis fields.The assimilation of total column ozone (TCO) observations in newer reanalyses results in realistic representations of TCO in reanalyses except when data coverage is lacking, such as during polar night. The vertical distribution of ozone is also relatively well represented in the stratosphere in reanalyses, particularly given the relatively weak constraints on ozone vertical structure provided by most assimilated observations and the simplistic representations of ozone photochemical processes in most of the reanalysis forecast models. However, significant biases in the vertical distribution of ozone are found in the upper troposphere and lower stratosphere in all reanalyses.Published by Copernicus Publications on behalf of the European Geosciences Union. S. M. Davis et al.: Reanalysis UTLS water vapor and ozone assessmentIn contrast to O 3 , reanalysis estimates of stratospheric WV are not directly constrained by assimilated data. Observations of atmospheric humidity are typically used only in the troposphere, below a specified vertical level at or near the tropopause. The fidelity of reanalysis stratospheric WV products is therefore mainly dependent on the reanalyses' representation of the physical drivers that influence stratospheric WV, such as temperatures in the tropical tropopause layer, methane oxidation, and the stratospheric overturning circulation. The lack of assimilated observations and known deficiencies in the representation of stratospheric transport in reanalyses result in much poorer agreement amongst observational and reanalysis estimates of stratospheric WV. Hence, stratospheric WV products from the current generation of reanalyses should generally not be used in scientific studies.

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Polar vortex dynamics during spring and fall diagnosed using trace gas observations from the Atmospheric Trace Molecule Spectroscopy instrument

Cited by 78 publications

References 76 publications

Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere

Validation of ACE-FTS v2.2 methane profiles from the upper troposphere to the lower mesosphere

Polar stratospheric cloud climatology based on CALIPSO spaceborne lidar measurements from 2006–2017

Assessment of upper tropospheric and stratospheric water vapor and ozone in reanalyses as part of S-RIP

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