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Seasonal and interannual variabilities in tropical tropospheric ozone

机译:热带对流层臭氧的季节和年际变化

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This paper presents the first detailed characterization of seasonal and interannual variability I tropical tropospheric column ozone (TCO) to delineate the relative importance of biomass burning and large-scale transport. TCO time series are derived from 20 years (1979-1998) of total ozone mapping spectrometer (TOMS) data using the convective cloud differential (CCD) method. Our study identifies three regions in the tropics with distinctly different characteristics related to seasonal and interannual variability. These three regions are the eastern Pacific, Atlantic, and western Pacific. TCO in the Atlantic region peaks at about the same time (September-October) both north and south of the equator, while the annual-cycle amplitude in TCO varies from about 3 to 6 Dobson units (DU) from north to south of the equator. In comparison, annual cycles in both the eastern and western Pacific are generally weak, with the largest TCO amount occurring around March-April in the northern hemisphere and September-November in the southern hemisphere. Interannual variabilities in these three regions are also very different. The Atlantic region indicates a predominant quasi-biennial oscillation (QBO) in TCO which is out of phase with the QBO in stratospheric ozone. This behavior is consistent with a UV modulation of upper tropospheric photochemistry on a QBO timescale caused by the QBO in stratospheric ozone. However, photochemical models predict significantly smaller changes, and dynamical effects may be a critical factor. Interannual variability in TCO in the Atlantic also appears to have some influence from biomass burning, but our study indicates that it is of lesser significance. Interannual variability in the eastern and western Pacific is dominated by El Nino events. During an El Nino there is anomalously low TCO in the eastern Pacific and high values in the western Pacific. These signatures indicate combined effects of convectively driven transport and tropospheric ozone generated by intense biomass burning in the Indonesian region. Finally, a simplified tropospheric ozone residual (STOR) method which utilizes the small variability of TCO near the dateline is proposed in this study to derive high-resolution maps and extended time series of TCO.
机译:本文介绍了热带对流层臭氧(TCO)的季节和年际变化的第一个详细特征,以描述生物质燃烧和大规模运输的相对重要性。 TCO时间序列是使用对流云差分(CCD)方法从20年(1979-1998)的总臭氧测图光谱仪(TOMS)数据得出的。我们的研究确定了热带地区的三个区域,这些区域具有与季节和年际变化相关的明显不同的特征。这三个区域是东太平洋,大西洋和西太平洋。大西洋地区的TCO大约在赤道以北和南部同时出现(9月至10月),而TCO的年周期振幅从赤道以北约3至6个杜布森单位(DU)。 。相比之下,东太平洋和西太平洋的年周期通常都比较弱,TCO量最大的发生在北半球的3月至4月和南半球的9月至11月。这三个区域的年际变化也非常不同。大西洋地区表示TCO中的主要准两年振荡(QBO)与平流层臭氧中的QBO异相。此行为与平流层臭氧中QBO引起的QBO时间尺度上对流层上层光化学的紫外线调制一致。但是,光化学模型预测的变化会小得多,动力学效应可能是一个关键因素。大西洋地区TCO的年际变化似乎也受到生物质燃烧的影响,但我们的研究表明它的重要性较小。东太平洋和西太平洋的年际变化主要由厄尔尼诺事件引起。在厄尔尼诺现象期间,东太平洋的TCO异常低,西太平洋的TCO异常高。这些特征表明对流驱动的运输和印度尼西亚地区大量生物质燃烧产生的对流层臭氧的综合作用。最后,本研究提出了一种简化的对流层臭氧残留(STOR)方法,该方法利用了时间轴附近的总拥有成本的微小变化来得出高分辨率图和总拥有成本的扩展时间序列。

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