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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >'Cloud slicing': A new technique to derive upper tropospheric ozone from satellite measurements
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'Cloud slicing': A new technique to derive upper tropospheric ozone from satellite measurements

机译：“云切片”：一种从卫星测量中得出对流层上空臭氧的新技术

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A new technique called cloud slicing has been developed for measuring upper tropospheric O-3. Cloud slicing takes advantage of the opaque property of water vapor clouds to ultraviolet wavelength radiation. Measurements of above-cloud column O-3 from the Nimbus 7 Total Ozone Mapping Spectrometer (TOMS) instrument are combined together with Nimbus 7 temperature-humidity and infrared radiometer (THIR) cloud-top pressure data to derive O-3 column amounts in the upper troposphere. In this study, tropical TOMS and THIR data for the period 1979-1984 are analyzed. By combining total tropospheric column ozone (referred to as TCO) measurements from the convective cloud differential (CCD) method with 100- to 400-hPa upper tropospheric column O-3 amounts from cloud slicing, it is possible to estimate 400- to 1000-hPa lower tropospheric column O-3 and evaluate its spatial and temporal variability. Results for both the upper and lower tropical troposphere show a year-round zonal wave number 1 pattern in column O-3 with the largest amounts in the Atlantic region (up to similar to 15 DU in the 100- to 400-hPa pressure band and similar to 25-30 DU in the 400- to 1000-hPa pressure band). Upper tropospheric O-3 derived from cloud slicing shows maximum column amounts in the Atlantic region in the June-August and September-November seasons which are similar to the seasonal variability of CCD-derived TCO in the region. For the lower troposphere, the largest column amounts occur in the September-November season over Brazil in South America and also southern Africa. Localized increases in the tropics in the lower tropospheric O-3 are found over the northern region of South America around August and off the west coast of equatorial Africa in the March-May season. Time series analysis for several regions in South America and Africa show an anomalous increase in O-3 in the lower troposphere around the month of March which is not observed in the upper troposphere. The eastern Pacific indicates weak seasonal variability of upper, lower, and total tropospheric O-3 compared with the western Pacific, which shows the largest TCO amounts in both hemispheres around spring months. O-3 variability in the western Pacific is expected to have greater variability caused by strong convection, pollution and biomass burning, land-sea contrast, and monsoon developments. [References: 23]
机译：已经开发出一种称为云切片的新技术来测量对流层上层O-3。云切片利用水蒸气云对紫外线波长辐射的不透明特性。将Nimbus 7总臭氧测图仪（TOMS）仪器对O-3以上云柱的测量结果与Nimbus 7温湿度和红外辐射仪（THIR）云顶压力数据结合起来，得出O-3柱中O-3柱的量对流层上层。在这项研究中，分析了1979-1984年期间的热带TOMS和THIR数据。通过将对流云差分法（CCD）的对流层总臭氧量（称为TCO）测量值与云层切变所产生的100-400hPa对流层上层O-3上量相结合，可以估算出400-1000-Pa hPa对流层下部O-3柱，并评估其时空变异性。热带对流层上部和下部的结果均显示，O-3列全年出现1级纬向波模式，在大西洋地区数量最大（在100至400hPa压力带中高达15 DU左右，在400-1000-hPa压力带中类似于25-30 DU）。来自云层切片的对流层上层O-3在6月-8月和9月-11月季节显示了大西洋地区的最大柱数，这与该地区源自CCD的TCO的季节变化相似。对于较低的对流层，最大柱数出现在南美和巴西南部的巴西的9-11月季节。在对流层低层O-3中，热带的局部增加出现在8月左右的南美北部地区和3月至5月的赤道非洲西海岸附近。对南美和非洲一些地区的时间序列分析显示，对流层下部低层O-3的异常增加在3月左右，而对流层上部没有观察到。与西太平洋相比，东太平洋表明对流层O-3的上，下和总季节变化较弱，而西太平洋显示春季前后两个半球的TCO量最大。预计由于强对流，污染和生物质燃烧，陆海对比和季风发展，西太平洋的O-3变异性会更大。 [参考：23]

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