Interactive comment on “Representing the effects of stratosphere-troposphere exchange on 3D O3 distributions in chemistry transport models using a potential vorticity based parameterization” by Jia Xing et al
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(UT/LS) ozone within regional air quality modeling systems. The parameterization is based on regressions between modeled potential vorticity (PV) and observed ozone profiles. Observed ozone is based on measurements from 44 northern hemisphere World Ozone and Ultraviolet Radiation Data Centre (WOUDC) sites. The modeled PV is based on a 21 year (1990-2010) coupled Weather Research and Forecasting (WRF) Community Multi-scale Air Quality (CMAQ) model. The new parameterization is able to account for the significant spatial and temporal variation in O3/PV ratios above 100 hPa and thus provides a much more generalized approach then used in previous studies. The impact of the new parameterization is evaluated by comparing a set of 1 year (2006) WRF-CMAQ simulations with WOUDC and surface measurements. Results show that the new parameterization significantly reduces low biases in the UT/LS compared to simulations with a fixed O3/PV ratio of 20 ppb/PVu resulting in positive impacts at the surface in spring. However, the new parameterization increased the high bias in surface ozone during autumn, resulting in negative impacts during this period. The methodology for developing the new parameterization, results, and conclusions are clearly presented and the work is highly relevant to the air quality modeling community. Figures and Tables in the main body of the manuscript are appropriate as are the supplemental figures.
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Interactive comment on “ Representing the effects of stratosphere - troposphere exchange on 3 D O 3 distributions in chemistry transport models using a potential vorticity based parameterization ” by
The authors derive an empirical correlation between stratospheric ozone and potential vorticity from two sets of data, with PV from the 21-year WRF simulation and ozone from WOUDC radiosondes during the same period. Specifically, they fit the ratio of ozone to PV as an order-5 polynomial function of latitude and an order-2 polynomial function of pressure (height). The temporal fitting, represen...
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Downward transport of ozone (O3) from the stratosphere can be a significant contributor to tropospheric O3 background levels. However, this process often is not well represented in current regional models. In this study, we develop a seasonally and spatially varying potential vorticity (PV)-based function to numerically assimilate upper tropospheric / lower stratospheric (UTLS) O3 in a chemistr...
متن کاملInteractive comment on “Validation of ACE-FTS satellite data in the upper troposphere/lower stratosphere (UTLS) using non-coincident measurements” by M. I. Hegglin et al
a) It is not true that satellites are the only means to get information on tracers at global scale. This is true for CO but not for O3 and H2O. O3 climatologies are available from a large number of ozonesondes in both the UT and the LS particularly in the NH, coincident in time with ACE-FTS, which could be used for evaluating the performances of the instrument, as done for SAGE, HALOE etc. Simi...
متن کاملStratosphere-troposphere exchange: a case study
Introduction Conclusions References Tables Figures Back Close Abstract Introduction Conclusions References Tables Figures Back Close Abstract An important part of extra-tropical stratosphere-to-troposphere transport occurs in association with baroclinic wave breaking and cutoff decay at the tropopause. In the last decade many studies have attempted to estimate stratosphere-troposphere exchange ...
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تاریخ انتشار 2016