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  1. Article ; Online: Investigation of spatial and temporal variability in lower tropospheric ozone from RAL Space UV–Vis satellite products

    R. J. Pope / B. J. Kerridge / R. Siddans / B. G. Latter / M. P. Chipperfield / W. Feng / M. A. Pimlott / S. S. Dhomse / C. Retscher / R. Rigby

    Atmospheric Chemistry and Physics, Vol 23, Pp 14933-

    2023  Volume 14947

    Abstract: Ozone is a potent air pollutant in the lower troposphere and an important short-lived climate forcer (SLCF) in the upper troposphere. Studies using satellite data to investigate spatiotemporal variability of troposphere ozone (TO 3 ) have predominantly ... ...

    Abstract Ozone is a potent air pollutant in the lower troposphere and an important short-lived climate forcer (SLCF) in the upper troposphere. Studies using satellite data to investigate spatiotemporal variability of troposphere ozone (TO 3 ) have predominantly focussed on the tropospheric column metric. This is the first study to investigate long-term spatiotemporal variability in lower tropospheric column ozone (LTCO 3 , surface–450 hPa sub-column) by merging multiple European Space Agency–Climate Change Initiative (ESA-CCI) products produced by the Rutherford Appleton Laboratory (RAL) Space. We find that in the LTCO 3 , the degree of freedom of signal (DOFS) from these products varies with latitude range and season and is up to 0.8, indicating that the retrievals contain useful information on lower TO 3 . The spatial and seasonal variation of the RAL Space products are in good agreement with each other, but there are systematic offsets of up to 3.0–5.0 DU between them. Comparison with ozonesondes shows that the Global Ozone Monitoring Experiment (GOME-1, 1996–2003), the SCanning Imaging Absorption spectroMeter for Atmospheric CartograpHY (SCIAMACHY, 2003–2010) and the Ozone Monitoring Instrument (OMI, 2005–2017) have stable LTCO 3 records over their respective periods, which can be merged together. However, GOME-2 (2008–2018) shows substantial drift in its bias with respect to ozonesondes. We have therefore constructed a robust merged data set of LTCO 3 from GOME-1, SCIAMACHY and OMI between 1996 and 2017. Comparing the LTCO 3 differences between the 1996–2000 and 2013–2017 5-year averages, we find sizeable positive increases (3.0–5.0 DU) in the tropics/sub-tropics, while in the northern mid-latitudes, we find small-scale differences in LTCO 3 . Therefore, we conclude that there has been a substantial increase in tropical/sub-tropical LTCO 3 during the satellite era, which is consistent with tropospheric column ozone (TCO 3 ) records from overlapping time periods (e.g. 2005–2016).
    Keywords Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 290
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Investigation of the summer 2018 European ozone air pollution episodes using novel satellite data and modelling

    R. J. Pope / B. J. Kerridge / M. P. Chipperfield / R. Siddans / B. G. Latter / L. J. Ventress / M. A. Pimlott / W. Feng / E. Comyn-Platt / G. D. Hayman / S. R. Arnold / A. M. Graham

    Atmospheric Chemistry and Physics, Vol 23, Pp 13235-

    2023  Volume 13253

    Abstract: In the summer of 2018, Europe experienced an intense heatwave which coincided with several persistent large-scale ozone ( O 3 ) pollution episodes. Novel satellite data of lower-tropospheric column O 3 from the Global Ozone Monitoring Experiment-2 (GOME- ... ...

    Abstract In the summer of 2018, Europe experienced an intense heatwave which coincided with several persistent large-scale ozone ( O 3 ) pollution episodes. Novel satellite data of lower-tropospheric column O 3 from the Global Ozone Monitoring Experiment-2 (GOME-2) and Infrared Atmospheric Sounding Interferometer (IASI) on the MetOp satellite showed substantial enhancements in 2018 relative to other years since 2012. Surface observations also showed ozone enhancements across large regions of continental Europe in summer 2018 compared to 2017. Enhancements to surface temperature and the O 3 precursor gases carbon monoxide and methanol in 2018 were co-retrieved from MetOp observations by the same scheme. This analysis was supported by the TOMCAT chemistry transport model (CTM) to investigate processes driving the observed O 3 enhancements. Through several targeted sensitivity experiments we show that meteorological processes, and emissions to a secondary order, were important for controlling the elevated O 3 concentrations at the surface. However, mid-tropospheric ( ∼ 500 hPa ) O 3 enhancements were dominated by meteorological processes. We find that contributions from stratospheric O 3 intrusions ranged between 15 %–40 %. Analysis of back trajectories indicates that the import of O 3 -enriched air masses into Europe originated over the North Atlantic, substantially increasing O 3 in the 500 hPa layer during summer 2018.
    Keywords Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 511
    Language English
    Publishing date 2023-10-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Investigating the global OH radical distribution using steady-state approximations and satellite data

    M. A. Pimlott / R. J. Pope / B. J. Kerridge / B. G. Latter / D. S. Knappett / D. E. Heard / L. J. Ventress / R. Siddans / W. Feng / M. P. Chipperfield

    Atmospheric Chemistry and Physics, Vol 22, Pp 10467-

    2022  Volume 10488

    Abstract: We present a novel approach to derive indirect global information on the hydroxyl radical (OH), one of the most important atmospheric oxidants, using state-of-the-art satellite trace gas observations (key sinks and sources of OH) and a steady-state ... ...

    Abstract We present a novel approach to derive indirect global information on the hydroxyl radical (OH), one of the most important atmospheric oxidants, using state-of-the-art satellite trace gas observations (key sinks and sources of OH) and a steady-state approximation (SSA). This is a timely study as OH observations are predominantly from spatially sparse field and infrequent aircraft campaigns, so there is a requirement for further approaches to infer spatial and temporal information on OH and its interactions with important climate (e.g. methane, CH 4 ) and air quality (e.g. nitrogen dioxide, NO 2 ) trace gases. Due to the short lifetime of OH ( ∼1 s), SSAs of varying complexities can be used to model its concentration and offer a tool to examine the OH budget in different regions of the atmosphere. Here, we use the well-evaluated TOMCAT three-dimensional chemistry transport model to identify atmospheric regions where different complexities of the SSAs are representative of OH. In the case of a simplified SSA (S-SSA), where we have observations of ozone (O 3 ) , carbon monoxide (CO), CH 4 and water vapour (H 2 O) from the Infrared Atmospheric Sounding Interferometer (IASI) on board ESA's MetOp-A satellite, it is most representative of OH between 600 and 700 hPa (though suitable between 400–800 hPa) within ∼20 %–30 % of TOMCAT modelled OH. The same S-SSA is applied to aircraft measurements from the Atmospheric Tomography Mission (ATom) and compares well with the observed OH concentrations within ∼26 %, yielding a correlation of 0.78. We apply the S-SSA to IASI data spanning 2008–2017 to explore the global long-term inter-annual variability of OH. Relative to the 10-year mean, we find that global annual mean OH anomalies ranged from −3.1 % to +4.7 %, with the largest spread in the tropics between −6.9 % and +7.7 %. Investigation of the individual terms in the S-SSA over this time period suggests that O 3 and CO were the key drivers of variability in the production and loss of OH. For example, large enhancement in the ...
    Keywords Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 333
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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