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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >NO2 column amounts from ground-based Pandora and MFDOAS spectrometers using the direct-sun DOAS technique:Intercomparisons and application to OMI validation
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NO2 column amounts from ground-based Pandora and MFDOAS spectrometers using the direct-sun DOAS technique:Intercomparisons and application to OMI validation

机译：使用直接太阳DOAS技术从地面Pandora和MFDOAS光谱仪获得的NO2柱量：相互比较及在OMI验证中的应用

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Vertical column amounts of nitrogen dioxide, C(NO 2), are derived from ground-based direct solar irradiance measurements using two new and independently developed spectrometer. systems, Pandora (Goddard Space Flight Center) and MFDOAS (Washington State University). We discuss the advantages of C(NO 2) retrievals based on Direct Sun - Differential Optical Absorption Spectroscopy (DS-DOAS). The C(NO 2) data are presented from field campaigns using Pandora at Aristotle University (AUTH), Thessaloniki, Greece; a second field campaign involving both new instruments at Goddard Space Flight Center (GSFC), Greenbelt, Maryland; a Pandora time series from December 2006 to October 2008 at GSFC; and a MFDOAS time series for spring 2008 at Pacific Northwest National Laboratory (PNNL), Richland, Washington. Pandora and MFDOAS were compared at GFSC and found to closely agree, with both instruments having a clear-sky precision of 0.01 DU (1 DU = 2.67 x 10 16 molecules/cm2) and a nominal accuracy of 0.1 DU. The high precision is obtained from careful laboratory characterization of the spectrometers (temperature sensitivity, slit function, pixel to pixel radiometric calibration, and wavelength calibration), and from sufficient measurement averaging to reduce instrument noise. The accuracy achieved depends on laboratory-measured absorption cross sections and on spectrometer laboratory and field calibration techniques used at each measurement site. The 0.01 DU precision is sufficient to track minute-by-minute changes in C(NO 2) throughout each day with typical daytime values ranging from 0.2 to 2 DU. The MFDOAS instrument has better noise characteristics for a single measurement, which permits MFDOAS to operate at higher time resolution than Pandora for the same precision. Because Pandora and MFDOAS direct-sun measurements can be made in the presence of light to moderate clouds, but with reduced precision (-0.2 DU for moderate cloud cover), a nearly continuous record can be obtained, which is important when matching OMI overpass times for satellite data validation. Comparisons between Pandora and MFDOAS with OMI are discussed for the moderately polluted GSFC site, between Pandora and OMI at the AUTH site, and between MFDOAS and OMI at the PNNL site. Validation of OMI measured C(NO2) is essential for the scientific use of the satellite data for air quality, for atmospheric photolysis and chemistry, and for retrieval of other quantities (e.g., accurate atmospheric correction for satellite estimates of ocean reflectance and bio-optical properties). Changes in the diurnal variability of C(NO 2) with season and day of the week are presented based on the 2-year time series at GSFC measured by the Pandora instrument.
机译：立柱中的二氧化氮C（NO 2）含量是使用两个独立开发的新光谱仪从地面直接太阳辐照度测量得出的。系统，潘多拉（Goddard太空飞行中心）和MFDOAS（华盛顿州立大学）。我们讨论基于直接太阳的C（NO 2）检索的优点-差分光学吸收光谱（DS-DOAS）。 C（NO 2）数据来自希腊萨洛尼卡亚里士多德大学（AUTH）使用Pandora进行的野外活动;在马里兰州格林贝尔特的戈达德太空飞行中心（GSFC）进行的涉及这两种新仪器的第二次野外运动; GSFC从2006年12月至2008年10月的潘多拉时间序列;以及MFDOAS时间序列，时间序列是2008年春季在华盛顿州里奇兰市的太平洋西北国家实验室（PNNL）。在GFSC上对Pandora和MFDOAS进行了比较，发现两者非常吻合，这两种仪器的天空分辨率均为0.01 DU（1 DU = 2.67 x 10 16分子/ cm2），标称精度为0.1 DU。通过对光谱仪进行仔细的实验​​室表征（温度灵敏度，狭缝功能，像素间像素辐射度校准和波长校准），以及通过进行足够的平均测量以降低仪器噪声，可以获得高精度。达到的精度取决于实验室测量的吸收截面以及每个测量站点使用的光谱仪实验室和现场校准技术。 0.01 DU的精度足以跟踪每天C（NO 2）的每分钟变化，典型日值范围为0.2到2 DU。 MFDOAS仪器在单次测量中具有更好的噪声特性，这使得MFDOAS在相同精度下的工作时间比Pandora更高。因为Pandora和MFDOAS直射阳光测量可以在有轻度到中度云的情况下进行，但是精度降低（对于中度云量，为-0.2 DU），因此可以获得近乎连续的记录，这在匹配OMI越过时间时很重要用于卫星数据验证。讨论了中度污染的GSFC站点，AUTH站点的Pandora和OMI之间以及PNNL站点的MFDOAS和OMI之间的比较，潘多拉和MFDOAS与OMI的比较。 OMI测得的C（NO2）的验证对于将卫星数据用于空气质量，大气光解和化学反应以及其他数量的检索（例如，对卫星的海洋反射率和生物光学估计值进行精确的大气校正）的科学应用至关重要。属性）。基于Pandora仪器测量的GSFC的2年时间序列，显示了C（NO 2）随季节和星期几的昼夜变化。

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