Non-coincident inter-instrument comparisons of ozone measurements using quasi-conservative coordinates

Lait, Leslie R.; Newman, Paul A.; Schoeberl, M. R.; McGee, Thomas J.; Twigg, Laurence; Browell, Edward V.; Fenn, M. A.; Grant, William B.; Butler, C. F.; Bevilacqua, R. M.; Davies, J.; Debacker, Hugo; Andersen, S. B.; Kyrö, E.; Kivi, E.; Gathen, Peter von der; Claude, H.; Benesova, A.; Skřivánková, P.; Dorokhov, V.; Zaitcev, I.; Braathen, Geir; Gil, Manuel; Lityńska, Z.; Moore, David; Gerding, M.

doi:10.5194/acp-4-2345-2004

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…We do not claim that this method is new. The benefit of using a Potential Vorticity/ Potential Temperature (PV/Theta) coordinate system for assimilating/comparing data sets has been understood for years [e.g., Lait et al, 2004;Manney et al, 2001]. But to the best of our knowledge, this is the first time that this technique has been applied to the ACE or MkIV data sets.…”

Section: Review Of Prior Ace Validationmentioning

confidence: 99%

Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles

et al. 2011

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[1] We have compared volume mixing ratio profiles of atmospheric trace gases measured by the Atmospheric Chemistry Experiment (ACE) version 2.2 and the MkIV solar occultation Fourier transform infrared spectrometers. These gases are H 2 O, O 3 , N 2 O, CO, CH 4 , HNO 3 , HF, HCl, OCS, ClONO 2 , HCN, CH 3 Cl, CF 4 , CCl 2 F 2 , CCl 3 F, COF 2 , CHF 2 Cl, and SF 6 . Due to the complete lack of close spatiotemporal coincidences between the ACE occultations and the MkIV balloon flights, we used potential temperatures and equivalent latitudes from analyzed meteorological fields to find comparable ACE and MkIV profiles. The results show excellent agreement for CH 4 , N 2 O, and other long-lived gases but slightly poorer agreement for shorter-lived species like CO, O 3 , and HCN. For example, in the upper troposphere (∼400-650 K), maximum differences between MkIV and ACE are 2.4% for CH 4 , 1.7% for N 2 O, −12.4% for CO, −15.9% for O 3 , and −5.6% for HCN. In the lower stratosphere (∼650-900 K), maximum MkIV-ACE differences are 7.6% for CH 4 , 14.1% for N 2 O, 7.3% for CO, −9.2% for O 3 , and 31.5% for HCN. Apart from a small vertical misregistration problem, the overall agreement between MkIV and ACE is very good.

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Section: Review Of Prior Ace Validationmentioning

confidence: 99%

Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles

et al. 2011

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“…Figure 7 also shows the datasets mapped into equivalent latitude versus potential temperature coordinates. The benefits of using EqL/θ coordinates (or PV/θ) for data comparisons are well established (e.g., Manney et al, 2001;Hegglin et al, 2006;Manney et al, 2007;Lait et al, 2004;Velazco et al, 2011). Trace gases with transport timescales significantly shorter than their chemical timescales are well mixed along EqL (or PV) contours on isentropic surfaces (e.g., Leovy et al, 1985), which facilitates comparisons of non-coincident measurements taken in the same air mass, in addition to providing criteria to filter out coincident measurements that were taken in different air masses (a common occurrence in regions of strong PV gradients such as the stratospheric vortex edge or the tropopause) (e.g., Manney et al, 2001;Michelsen et al, 2002;Lumpe et al, 2002;Chiou et al, 2004;Lumpe et al, 2006;Manney et al, 2007;Velazco et al, 2011;Griffin et al, 2017;Ryan et al, 2017;Bognar et al, 2019).…”

Section: Coordinate Systemsmentioning

confidence: 99%

A Multi-Parameter Dynamical Diagnostics for Upper Tropospheric and Lower Stratospheric Studies

Millán

Manney

Bönisch

et al. 2023

Preprint

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Abstract. Ozone trend estimates have shown large uncertainties in the upper troposphere/lower stratosphere (UTLS) region despite multi-decadal observations available from ground-based, balloon, aircraft, and satellite platforms. These uncertainties arise from large natural variability driven by dynamics (reflected in tropopause and jet variations) as well as the strength in constituent transport and mixing. Additionally, despite all the community efforts there is still a lack of representative high-quality global UTLS measurements to capture this variability. The Stratosphere-troposphere Processes And their Role in Climate (SPARC) Observed Composition Trends and Variability in the UTLS (OCTAV-UTLS) activity aims to reduce uncertainties in UTLS composition trend estimates by accounting for this dynamically induced variability. In this paper, we describe the production of dynamical diagnostics using meteorological information from reanalysis fields that facilitate mapping observations from several platforms into numerous geophysically-based coordinates (including tropopause and upper tropospheric jet relative coordinates). Suitable coordinates should increase the homogeneity of the air masses analyzed together, thus reducing the uncertainty caused by spatio-temporal sampling biases in the quantification of UTLS composition trends. This approach thus provides a framework for comparing measurements with diverse sampling patterns and leverages the meteorological context to derive maximum information on UTLS composition and trends and its relationships to dynamical variability. The dynamical diagnostics presented here are the first comprehensive set describing the meteorological context for multi-decadal observations by ozonesondes, lidar, aircraft, and satellite measurements in order to study the impact of dynamical processes on observed UTLS trends by different sensors on different platforms. Examples using these diagnostics to map multi-platform datasets into different geophysically-based coordinate systems are provided. The diagnostics presented can also be applied to analysis of greenhouse gases other than ozone that are relevant to surface climate and UTLS chemistry.

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“…For the summer period ozone photochemical production is expected according to the numerous studies conducted at mid-latitudes (Crutzen et al, 1999;Parrish et al, 2012), but little attention has been given to the high latitude distribution during this season. During the ARCTAS-B (Jacob et al, 2010) and POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements, and Models of Climate Chemistry, Aerosols, and Transport) campaigns (Law et al, 2014), many ozone measurements were carried out over Canada and Greenland from 15 June to 15 July 2008 via aircraft and regular ozone soundings. This allows a detailed analysis of the ozone regional distribution at high latitudes between 55 and 90 • N and a discussion about the relevant ozone sources driving the summer ozone values.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008

Ancellet¹,

Daskalakis²,

Raut³

et al. 2016

Preprint

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Abstract. The goal of the paper are to: (1) present tropospheric ozone (O3) climatologies in summer 2008 based on a large amount of measurements, during the International Polar Year when the Polar Study using Aircraft, Remote Sensing, Surface Measurements, and Models of Climate Chemistry, Aerosols, and Transport (POLARCAT) campaigns were conducted (2) investigate the processes that determine O3 concentrations in two different regions (Canada and Greenland) that were thoroughly studied using measurements from 3 aircraft and 7 ozonesonde stations. This paper provides an integrated analysis of these observations and the discussion of the latitudinal and vertical variability of tropospheric ozone north of 55&#176; N during this period is performed using a regional model (WFR-Chem). Ozone, CO and potential vorticity (PV) distributions are extracted from the simulation at the measurement locations. The model is able to reproduce the O3 latitudinal and vertical variability but a negative O3 bias of 6&#8211;15 ppbv is found in the free troposphere over 4 km, especially over Canada. Ozone average concentrations are of the order of 65 ppbv at altitudes above 4 km both over Canada and Greenland, while they are less than 50 ppbv in the lower troposphere. The relative influence of stratosphere-troposphere exchange (STE) and of ozone production related to the local biomass burning (BB) emissions is discussed using differences between average values of O3, CO and PV for Southern and Northern Canada or Greenland and two vertical ranges in the troposphere: 0&#8211;4 km and 4&#8211;8 km. For Canada, the model CO distribution and the weak correlation (< 30 %) of O3 and PV suggests that stratosphere-troposphere exchange (STE) is not the major contribution to average tropospheric ozone at latitudes less than 70&#176; N, due to the fact that local biomass burning (BB) emissions were significant during the 2008 summer period. Conversely over Greenland, significant STE is found according to the better O3 versus PV correlation (> 40 %) and the higher 75th PV percentile. A weak negative latitudinal summer ozone gradient &#8722;6 to &#8722;8 ppbv is found over Canada in the mid troposphere between 4 and 8 km. This is attributed to an efficient O3 photochemical production due to the BB emissions at latitudes less than 65&#176; N, while STE contribution is more homogeneous in the latitude range 55&#176; N to 70&#176; N. A positive ozone latitudinal gradient of 12 ppbv is observed in the same altitude range over Greenland not because of an increasing latitudinal influence of STE, but because of different long range transport from multiple mid-latitude sources (North America, Europe and even Asia for latitudes higher than 77&#176; N).

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Non-coincident inter-instrument comparisons of ozone measurements using quasi-conservative coordinates

Cited by 10 publications

References 20 publications

Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles

Validation of the Atmospheric Chemistry Experiment by noncoincident MkIV balloon profiles

A Multi-Parameter Dynamical Diagnostics for Upper Tropospheric and Lower Stratospheric Studies

Analysis of the latitudinal variability of tropospheric ozone in the Arctic using the large number of aircraft and ozonesonde observations in early summer 2008

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