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首页> 外文期刊>Applied optics >Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers
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Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers

机译：使用紫外多重滤光片旋转阴影带辐射计与Brewer和Dobson分光光度计进行的柱臭氧回收的比较

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The U.S. Department of Agriculture UV-B Monitoring Program measures ultraviolet light at seven wavelengths from 300 to 368 nm with an ultraviolet multi filter rotating shadow-band radiometer (UV-MFRSR) at 25 sites across the United States, including Mauna Loa, Hawaii. Column ozone has been retrieved under all-sky conditions near Boulder, Colorado (40.177 °N, 105.276 °W), from global irradiances of the UV-MFRSR 332- and 305-nm channels (2 nm FWHM) using lookup tables generated from a multiple-scattering radiative transfer code suitable for solar zenith angles (SZA's) up to 90°. The most significant sources of error for UV-MFRSR column ozone retrievals at SZA's less than 75° are the spectral characterizations of the filters and the absolute calibration uncertainty, which together yield an estimated uncertainty in ozone retrievals of ±4.0%. Using model sensitivity studies, we determined that the retrieved column ozone is relatively insensitive (<±2%) to typical variations in aerosol optical depth, cloud cover, surface pressure, stratospheric temperature, and surface albedo. For 5 months in 1996-1997 the mean ratio of column ozone retrieved by the UV-MFRSR divided by that retrieved by the collocated Brewer was 1.024 and for the UV-MFRSR divided by those from a nearby Dobson was 1.025. The accuracy of the retrieval becomes unreliable at large SZA's of more than 75° as the detection limit of the 305-nm channel is reached and because of overall angular response errors. The UV-MFRSR advantages of relatively low cost, unattended operation, automated calibration stability checks using Langley plots, and minimal maintenance make it a unique instrument for column ozone measurement.
机译：美国农业部UV-B监控计划使用紫外线多滤光镜旋转阴影带辐射计（UV-MFRSR）在美国25个地点（包括夏威夷的莫纳罗阿）测量300至368 nm七个波长的紫外线。使用UV-MFRSR 332和305 nm通道（2 nm FWHM）的全球辐照度，使用科罗拉多州立大学产生的查找表，在科罗拉多州博尔德（40.177°N，105.276°W）附近的全天候条件下，回收了柱状臭氧。多散射辐射传输码，适用于高达90°的太阳天顶角（SZA）。在SZA小于75°时，UV-MFRSR色谱柱臭氧回收的最主要误差来源是过滤器的光谱特性和绝对校准不确定度，二者合计得出的臭氧回收不确定度为±4.0％。通过模型敏感性研究，我们确定，回收的臭氧柱对气溶胶光学深度，云量，表面压力，平流层温度和表面反照率的典型变化相对不敏感（<±2％）。在1996年至1997年的5个月中，UV-MFRSR回收的柱臭氧的平均比率除以并置的Brewer回收的臭氧的平均比率为1.024，而UV-MFRSR的柱臭氧的平均比率除以附近Dobson的平均比率为1.025。由于达到了305 nm通道的检测极限，并且由于总体角度响应误差，在大于75°的大型SZA上，检索的准确性变得不可靠。 UV-MFRSR具有相对较低的成本，无人值守的操作，使用Langley图进行自动校准稳定性检查以及维护最少的优点，使其成为用于色谱柱臭氧测量的独特仪器。

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