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首页> 外文期刊>Atmospheric chemistry and physics >Global ozone-CO correlations from OMI and AIRS: Constraints on tropospheric ozone sources
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Global ozone-CO correlations from OMI and AIRS: Constraints on tropospheric ozone sources

机译：OMI和AIRS的全球臭氧与CO的相互关系：对流层臭氧源的限制

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摘要

We present a global data set of free tropospheric ozone-CO correlations with 2° × 2.5° spatial resolution from the Ozone Monitoring Instrument (OMI) and Atmospheric Infrared Sounder (AIRS) satellite instruments for each season of 2008. OMI and AIRS have near-daily global coverage of ozone and CO respectively and observe coincident scenes with similar vertical sensitivities. The resulting ozone-CO correlations are highly statistically significant (positive or negative) in most regions of the world, and are less noisy than previous satellite-based studies that used sparser data. Comparison with ozone-CO correlations and regression slopes (dO_3/dCO) from MOZAIC (Measurements of OZone, water vapour, carbon monoxide and nitrogen oxides by in-service AIrbus airCraft) aircraft profiles shows good general agreement. We interpret the observed ozone-CO correlations with the GEOS (Goddard Earth Observing System)-Chem chemical transport model to infer constraints on ozone sources. Driving GEOS-Chem with different meteorological fields generally shows consistent ozone-CO correlation patterns, except in some tropical regions where the correlations are strongly sensitive to model transport error associated with deep convection. GEOS-Chem reproduces the general structure of the observed ozone-CO correlations and regression slopes, although there are some large regional discrepancies. We examine the model sensitivity of dO_3/dCO to different ozone sources (combustion, biosphere, stratosphere, and lightning NO_x) by correlating the ozone change from that source to CO from the standard simulation. The model reproduces the observed positive dO 3/dCO in the extratropical Northern Hemisphere in spring-summer, driven by combustion sources. Stratospheric influence there is also associated with a positive dO_3/dCO because of the interweaving of stratospheric downwelling with continental outflow. The well-known ozone maximum over the tropical South Atlantic is associated with negative dO_3/dCO in the observations; this feature is reproduced in GEOS-Chem and supports a dominant contribution from lightning to the ozone maximum. A major model discrepancy is found over the northeastern Pacific in summer-fall where dO_3/dCO is positive in the observations but negative in the model, for all ozone sources. We suggest that this reflects a model overestimate of lightning at northern midlatitudes combined with an underestimate of the East Asian CO source.
机译：我们提供了臭氧监测仪器（OMI）和大气红外探测仪（AIRS）卫星仪器在2008年每个季节提供的具有2°×2.5°空间分辨率的对流层臭氧与一氧化碳自由相关的全球数据集。OMI和AIRS具有近乎-每天分别覆盖臭氧和一氧化碳，并观察具有相似垂直敏感度的重合场景。在世界上大多数地区，由此产生的臭氧与CO的相关性在统计上高度显着（正或负），并且与以前使用稀疏数据的基于卫星的研究相比，其噪声较小。与MOZAIC的臭氧-CO相关性和回归斜率（dO_3 / dCO）进行比较（通过在役的AIrbus AirCraft对OZone，水蒸气，一氧化碳和氮氧化物的测量）显示出良好的总体一致性。我们用GEOS（Goddard地球观测系统）-Chem化学传输模型解释了观测到的臭氧与CO的相关性，以推断出对臭氧源的约束。除在某些热带地区对与深对流有关的模型传输误差非常敏感的热带地区外，用不同的气象场驱动GEOS-Chem通常显示出一致的臭氧-CO相关模式。尽管存在一些较大的区域差异，GEOS-Chem再现了观测到的臭氧-CO相关性和回归斜率的一般结构。通过将标准模拟中从该来源到CO的臭氧变化关联起来，我们研究了dO_3 / dCO对不同臭氧源（燃烧，生物圈，平流层和闪电NO_x）的模型敏感性。该模型再现了由燃烧源驱动的，在春夏季温带北半球观测到的正dO 3 / dCO。由于平流层下行流与大陆流出的交织，平流层的影响也与正dO_3 / dCO相关。观测到的热带南大西洋上空的臭氧最大值与观测值中的dO_3 / dCO负相关。此功能在GEOS-Chem中复制，并支持从闪电到臭氧最大值的主要贡献。在夏季秋季的东北太平洋上发现了一个主要的模型差异，对于所有臭氧源，dO_3 / dCO在观测中为正，但在模型中为负。我们建议，这反映了北部中纬度地区闪电的高估与东亚CO来源的低估的模型。

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