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Abstract
Abstract. A tracer study has been performed for two summers in 2003 and 2004 with a regional chemistry-transport model in order to evaluate the potential constraint that tropospheric ozone observations from nadir viewing infrared sounders like IASI or TES exert on modelled near surface ozone. As these instruments show high sensitivity in the free troposphere, but low sensitivity at ground, it is important to know how much of the information gained in the free troposphere is transferred to ground through vertical transport processes. Within the European model domain, and within a time span of 4 days, only ozone like tracers initialised in vertical layers above 500 hPa are transported to the surface. For a tracer initialised between 800 and 700 hPa, seven percent reaches the surface within one to three days, on the average over the European model domain but more than double over the Mediterranean Sea. For this region, trajectory analysis shows that this is related to strong subsident transport. These results are confirmed by a second tracer study taking into account averaging kernels related to IASI retrievals, indicating the potential of these measurements to efficiently constrain surface ozone values.
Highlights
IntroductionDue to its harmful character for human health and for vegetation and materials, many efforts are made to monitor and control its concentrations
Since many years, ozone is one of the main targets of pollution control policy
A tracer study has been performed in order to evaluate the potential constraint of ozone observations from nadir viewing infrared sounders like IASI or TES on near surface ozone
Summary
Due to its harmful character for human health and for vegetation and materials, many efforts are made to monitor and control its concentrations This is one of the objectives of the Global Monitoring for Environment and Security (GMES) project (http://www.gmes.info), which aims at developing integrated observation and modeling systems to inform population about exposure to sporadic high pollutant levels, and to settle a scientific basis for constructing mitigation policies to avoid such episodes and long-term exposure to high-level ozone concentrations. The PREVAIR platform (www.prevair.org) uses two of such models (CHIMERE and MOCAGE) for operational forecast of ozone and particulate matter concentrations (Honoreet al., 2008) two days in advance. In this framework, ozone concentrations simulated with the CHIMERE model have been compared to ground-based measurements for three spring/summer periods between 2004 and 2006. Honoreet al. (2008) showed that the mean model bias of daily ozone maxima was mostly under 5 μg/m−3, RMSE (root mean square error) was generally less than 20 μg/m−3 and temporal correlation was more than 0.8 on average over Western Europe
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