MIPAS reference atmospheres and comparisons to V4.61/V4.62 MIPAS level 2 geophysical data sets
MIPAS reference atmospheres and comparisons to V4.61/V4.62 MIPAS level 2 geophysical data sets
复制标题
MIPAS 参考大气以及与 V4.61/V4.62 MIPAS 2 级地球物理数据集的比较
DOI：
10.5194/acpd-7-9973-2007
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发表时间：
2007
影响因子：
6.3
通讯作者：
D. Hauglustaine
中科院分区：
文献类型：
--
作者：
J. Remedios;R. Leigh;A. Waterfall;D. Moore;H. Sembhi;I. Parkes;J. Greenhough;M. Chipperfield;D. Hauglustaine
抽象的。可靠的参考剖面和变异性估计是与 ENVISAT 相关的各种流程所必需的，包括开发用于被动大气探测的迈克尔逊干涉仪的操作处理器的关键方面和输入。因此，MIPAS 参考大气以两种形式产生，即用于典型大气情况的建模和误差分析的标准大气，以及用作操作处理一部分的初始猜测剖面的 IG2 季节气候学。参考状态涵盖 0 至 120 公里的共同海拔、压力和温度网格上的 36 个物种，并包括变异性的平均值和估计值（最大、最小和 1 西格玛值）。本文介绍了当前版本的标准大气 V3.1 和 IG2 大气 V4.0。特别关注 MIPAS 业务地球物理产品（压力/温度、H2O、O3、CH4、N2O、HNO3 和 NO2）以及 CO2，其混合比是恢复压力和温度所必需的。给出了 CO2 的动态表示，显示了对流层和平流层下部存在 CO2 梯度。由于这些大气是独立于 MIPAS 数据产生的，因此还可以将数据与 MIPAS 操作产品进行比较，并获得有关参考大气和 MIPAS 数据产品本身的有价值的信息。作为 MIPAS 验证活动的一部分，已对 2003 年的 V4.61/V4.62 数据执行了此过程。结果表明，在中纬度地区和热带地区，MIPAS 平均数据与参考大气之间的一致性非常好，验证了这些数据的一阶性。 IG2 大气和根据 MIPAS 数据计算出的相应西格玛之间的标准偏差也有合理的一致性。对流层 CH4 和 N2O 浓度的了解用于检查 MIPAS 数据的准确性及其对云效应的敏感性。结果表明，为了获得最高精度，MIPAS 数据应使用 N2O 云指数值为 2.5 和 CH4 云指数值为 3.5 进行过滤。一旦执行了此类过滤，这些物种的 MIPAS 数据在对流层上层的精确度似乎在 10% 以内。建议将云指数数据与 MIPAS 数据结合使用来研究极地冬季平流层和对流层上层/平流层下层。
Abstract. Reliable reference profiles and estimates of variability are a necessity for a variety of processes relating to ENVISAT including the development of key aspects and inputs for the operational processor for the Michelson Interferometer for Passive Atmospheric Sounding. MIPAS reference atmospheres have therefore been produced in two forms, namely standard atmospheres for modelling and error analysis for typical atmospheric situations and the IG2 seasonal climatologies for initial guess profiles used as part of the operational processing. The reference states cover 36 species on a common altitude, pressure, and temperature grid from 0 to 120 km, and include both means and estimates of variability (maximum, minimum and one sigma values). This paper describes V3.1 of the standard atmospheres and V4.0 of the IG2 atmospheres which are the current versions of the reference atmospheres. Particular attention is paid to the MIPAS operational geophysical products (pressure/temperature, H2O, O3, CH4, N2O, HNO3 and NO2) and to CO2 whose mixing ratio is required for the retrieval of pressure and temperature. A dynamic representation of CO2 is presented which shows the presence of CO2 gradients in the troposphere and the lower stratosphere. Since these atmospheres have been produced independently of MIPAS data, it is also possible to compare the data to the MIPAS operational products and derive valuable information on both the reference atmospheres and on MIPAS data products themselves. This process has been performed for V4.61/V4.62 data from the year 2003 as part of the MIPAS validation activity. It is demonstrated that the agreement between the MIPAS mean data and the reference atmospheres is very good in mid-latitudes and the tropics, verifying these data to first order. There is also reasonable agreement in standard deviations between the IG2 atmospheres and the corresponding sigmas calculated from the MIPAS data. Knowledge of tropospheric concentrations of CH4 and N2O is used to examine the accuracy of the MIPAS data and their susceptibility to cloud effects. It is shown that for the highest accuracy, MIPAS data should be filtered with cloud index values of 2.5 for N2O and 3.5 for CH4. Once such filtering has been performed, the MIPAS data for these species appear to be accurate to within 10% in the upper troposphere. The use of cloud index data in combination with MIPAS data is recommended for studies of the polar winter stratosphere and the upper troposphere/lower stratosphere.