A 25‐year data record of atmospheric ozone in the Pacific from Total Ozone Mapping Spectrometer (TOMS) cloud slicing: Implications for ozone trends in the stratosphere and troposphere
A 25‐year data record of atmospheric ozone in the Pacific from Total Ozone Mapping Spectrometer (TOMS) cloud slicing: Implications for ozone trends in the stratosphere and troposphere
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总臭氧测绘光谱仪 (TOMS) 云切片记录的太平洋大气臭氧 25 年数据：对平流层和对流层臭氧趋势的影响
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
P. Bhartia
中科院分区：
文献类型：
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作者：
J. Ziemke;S. Chandra;P. Bhartia
[1]利用1979 - 2003年新处理的太阳后向散射紫外线（SBUV）和臭氧总量测绘光谱仪（TOMS）第8版数据，估算了太平洋地区平均臭氧的季节循环、纬度依赖性和长期趋势在大气的三个大层（120°W至120°E）中：平流层上部（32 hPa及以上）、平流层下部（32 hPa至对流层顶）和对流层。这些层中的臭氧量是通过首先使用该区域大量的深对流云从TOMS确定太平洋平流层臭氧柱得出的。然后通过计算总臭氧柱和平流层臭氧柱之间的差值来确定太平洋的对流层臭氧柱。利用平流层气溶胶和气体实验二号仪器的平流层臭氧数据，在从热带延伸到±60°纬度的地区对这种“云切片”技术进行了广泛的测试。云切片技术在获得TCO的有效性也进行了测试使用的数据从臭氧探测仪在很大范围内的纬度。SBUV臭氧廓线用于测量太平洋区域平流层上部臭氧柱。平流层下部臭氧柱是由平流层臭氧柱和平流层上部臭氧柱之间的差异得出的。这一过程产生了覆盖所有纬度和季节的三个大气层中太平洋平均臭氧的独特的25年记录。对数据的分析表明，这些层的季节周期、纬度依赖性和趋势有很大的不同。在25年的记录中，臭氧消耗大部分发生在低于1025公里高度的平流层下部。在中高纬度地区，平流层下部的臭氧损失是平流层上部的3-4倍，尽管这两个区域的臭氧量大致相同。对于对流层，TCO在两个半球的中纬度地区显示出统计上显著的上升趋势，但在热带地区没有。
[1] The newly reprocessed solar backscatter ultraviolet (SBUV) and Total Ozone Mapping Spectrometer (TOMS) version 8 data from 1979 to 2003 are used to estimate the seasonal cycle, latitude dependence, and long-term trends in ozone averaged over the Pacific region (120°W to 120°E) in three broad layers of the atmosphere: upper stratosphere (32 hPa and above), lower stratosphere (32 hPa to tropopause), and the troposphere. The ozone amount in these layers is derived by first determining stratospheric column ozone in the Pacific from TOMS using deep convective clouds, which are numerous in the region. Tropospheric column ozone (TCO) for the Pacific is then determined by taking the difference between total column ozone and stratospheric column ozone. This “cloud-slicing” technique is extensively tested from the tropics extending to ±60° latitude using stratospheric ozone data from the Stratospheric Aerosol and Gas Experiment II instrument. The validity of the cloud-slicing technique in obtaining TCO is also tested using data from ozonesondes over a wide range of latitude. SBUV ozone profiles are used to measure upper stratospheric column ozone for the Pacific region. Lower stratospheric column ozone is then derived from the difference between stratospheric column ozone and upper stratospheric column ozone. This process yields a unique 25-year record of Pacific mean ozone in three atmospheric layers covering all latitudes and seasons. The analysis of the data shows that the seasonal cycles, latitude dependence, and trends in these layers are substantially different. Over the 25-year record most ozone depletion has occurred in the lower stratosphere below ∼25 km altitude. In middle and high latitudes, ozone losses are 3–4 times larger in the lower stratosphere compared with the upper stratosphere, even though the ozone amounts in the two regions are about the same. For the troposphere, TCO shows a statistically significant upward trend in the midlatitudes of both hemispheres but not in the tropics.