Validation of MIPAS IMK/IAA methane profiles
Validation of MIPAS IMK/IAA methane profiles
复制标题
DOI：
10.5194/amt-8-5251-2015
复制
发表时间：
2015-12
影响因子：
3.8
通讯作者：
A. Laeng;J. Plieninger;T. Clarmann;U. Grabowski;G. Stiller;E. Eckert;N. Glatthor;F. Haenel;S. Kellmann;M. Kiefer;A. Linden;S. Lossow;L. Deaver;A. Engel;M. Hervig;I. Levin;M. McHugh;S. Noel;G. Toon;K. Walker
中科院分区：
文献类型：
--
作者：
A. Laeng;J. Plieninger;T. Clarmann;U. Grabowski;G. Stiller;E. Eckert;N. Glatthor;F. Haenel;S. Kellmann;M. Kiefer;A. Linden;S. Lossow;L. Deaver;A. Engel;M. Hervig;I. Levin;M. McHugh;S. Noel;G. Toon;K. Walker
抽象的。用于被动大气探测的迈克尔逊干涉仪 (MIPAS) 是 Envisat 平台上的红外 (IR) 临边发射光谱仪。它可以在白天和夜间、极地之间测量痕量气体分布，标称模式下的海拔范围为 6 至 70 公里，特殊模式下可达 170 公里，具体取决于测量模式，在第 1 天生成 1000 多个剖面。我们展示了甲烷验证研究的结果，版本为 V5R_CH4_222，由 IMK/IAA（卡尔斯鲁厄气象研究所和格林纳达安达卢西亚天文研究所）MIPAS 科学 2 级处理器检索。 1 级光谱由 ESA（欧洲航天局）提供，并使用版本 5。涵盖的时间段为 2005 年至 2012 年，对应于 MIPAS 以 0.0625 cm−1 的降低光谱分辨率测量痕量气体分布的时期。与卫星仪器的比较包括大气化学实验傅里叶变换光谱仪（ACE-FTS）、卤素掩星实验（HALOE）、冰掩日实验（SOFIE）和大气制图扫描成像吸收光谱仪（SCIAMACHY）。此外，还与 MkIV 气球载太阳掩星测量以及法兰克福大学进行的空气采样测量进行了比较。验证活动包括偏差确定、稳定性评估、精度验证、直方图分析和相应气候学比较。在 50 公里海拔以上，MIPAS 甲烷混合比与 ACE-FTS 和 SOFIE 的误差在 3% 以内。在 30 至 40 公里之间，与 SCIAMACHY 的偏差在 3% 以内。在平流层中层，由于与各种仪器的比较相互矛盾，因此没有明显的 MIPAS 偏差迹象。在平流层较低层（25 公里以下），MIPAS CH4 相对于卫星仪器的偏差较高，这种偏差最可能的估计值为 14%。然而，在与低温全空气采样器（cryosampler）测量获得的 CH4 数据进行比较时，没有证据表明 MIPAS 在 20 至 25 km 高度之间存在高偏差。对并置的 MIPAS-MIPAS 对进行精度验证，结果表明其不确定性略微低估了 1.2 倍。尚未发现仪器漂移的重要证据。
Abstract. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is an infrared (IR) limb emission spectrometer on the Envisat platform. It measures trace gas distributions during day and night, pole-to-pole, over an altitude range from 6 to 70 km in nominal mode and up to 170 km in special modes, depending on the measurement mode, producing more than 1000 profiles day−1. We present the results of a validation study of methane, version V5R_CH4_222, retrieved with the IMK/IAA (Institut fur Meteorologie und Klimaforschung, Karlsruhe/Instituto de Astrofisica de Andalucia, Grenada) MIPAS scientific level 2 processor. The level 1 spectra are provided by the ESA (European Space Agency) and version 5 was used. The time period covered is 2005–2012, which corresponds to the period when MIPAS measured trace gas distributions at a reduced spectral resolution of 0.0625 cm−1. The comparison with satellite instruments includes the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS), the HALogen Occultation Experiment (HALOE), the Solar Occultation For Ice Experiment (SOFIE) and the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). Furthermore, comparisons with MkIV balloon-borne solar occultation measurements and with air sampling measurements performed by the University of Frankfurt are presented. The validation activities include bias determination, assessment of stability, precision validation, analysis of histograms and comparison of corresponding climatologies. Above 50 km altitude, MIPAS methane mixing ratios agree within 3 % with ACE-FTS and SOFIE. Between 30 and 40 km an agreement within 3 % with SCIAMACHY has been found. In the middle stratosphere, there is no clear indication of a MIPAS bias since comparisons with various instruments contradict each other. In the lower stratosphere (below 25 km) MIPAS CH4 is biased high with respect to satellite instruments, and the most likely estimate of this bias is 14 %. However, in the comparison with CH4 data obtained from cryogenic whole-air sampler (cryosampler) measurements, there is no evidence of a high bias in MIPAS between 20 and 25 km altitude. Precision validation is performed on collocated MIPAS–MIPAS pairs and suggests a slight underestimation of its uncertainties by a factor of 1.2. No significant evidence of an instrumental drift has been found.