Odin/SMR limb observations of stratospheric trace gases: Validation of N2O
Odin/SMR limb observations of stratospheric trace gases: Validation of N2O
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平流层痕量气体的 Odin/SMR 临边观测：N2O 的验证
DOI：
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发表时间：
2005
期刊：
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通讯作者：
M. Ridolfi
中科院分区：
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作者：
J. Urban;N. Lautié;E. L. Flochmoën;C. Jiménez;P. Eriksson;J. Noë;E. Dupuy;L. E. Amraoui;U. Frisk;F. Jégou;D. Murtagh;M. Olberg;P. Ricaud;C. Camy‐Peyret;G. Dufour;S. Payan;N. Huret;M. Pirre;A. Robinson;N. Harris;H. Bremer;A. Kleinböhl;K. Küllmann;K. Künzi;J. Kuttippurath;M. Ejiri;H. Nakajima;Y. Sasano;T. Sugita;T. Yokota;C. Piccolo;P. Raspollini;M. Ridolfi
Odin 卫星上的亚毫米辐射计 (Odin/SMR) 于 2001 年 2 月 20 日发射，利用以 502.296 GHz 为中心的 J = 20R 19 旋转跃迁的光谱观测定期测量平流层一氧化二氮 (N2O) 的全球分布。我们通过与独立的气球载和机载验证测量进行比较以及与其他卫星仪器的初步结果进行交叉比较，对检索到的 N2O 剖面（2 级产品）进行质量评估。所调查的所有 SMR 数据版本（v222、v223 和 v1.2）的均方根 (RMS) 偏差与机载验证实验一致，误差在 28 ppbv 以内。更准确地说，对于低于 200 ppbv 的 N2O 体积混合比 (VMR)，该一致性在 19 ppbv 以内；对于大于 150 ppbv 的混合比，该一致性在 10% 以内。考虑到这种比较所固有的大气变化带来的不确定性，这些值应被解释为 Odin/SMR N2O 测量系统误差的上限。 Odin/SMR N2O 混合比系统地略高于从先进地球观测卫星-II (ADEOS-II) 上的改进临边大气光谱仪-II (ILAS-II) 获得的未经验证的数据。对于版本 222 和 223，均方根偏差通常在 23 ppbv 以内（对于 VMR-N2O > 100 ppbv，为 20%）。与 Envisat 卫星上的被动大气探测迈克尔逊干涉仪 (MIPAS) 获得的数据进行比较，结果在 9-17 ppbv 范围内（对于 VMR-N2O > 100，为 10%）。 ppbv) 对于相同的数据版本。 Odin/SMR 1.2 版数据显示稍大的 RMS 偏差和较高的正偏差。
The Sub-Millimetre Radiometer (Odin/SMR) on board the Odin satellite, launched on 20 February 2001, performs regular measurements of the global distribution of stratospheric nitrous oxide (N2O) using spectral observations of the J = 20R 19 rotational transition centered at 502.296 GHz. We present a quality assessment for the retrieved N2O profiles (level 2 product) by comparison with independent balloonborne and aircraftborne validation measurements as well as by cross-comparing with preliminary results from other satellite instruments. An agreement with the airborne validation experiments within 28 ppbv in terms of the root mean square (RMS) deviation is found for all SMR data versions (v222, v223, and v1.2) under investigation. More precisely, the agreement is within 19 ppbv for N2O volume mixing ratios (VMR) lower than 200 ppbv and within 10% for mixing ratios larger than 150 ppbv. Given the uncertainties due to atmospheric variability inherent to such comparisons, these values should be interpreted as upper limits for the systematic error of the Odin/SMR N2O measurements. Odin/SMR N2O mixing ratios are systematically slightly higher than nonvalidated data obtained from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II). Root mean square deviations are generally within 23 ppbv (or 20% for VMR-N2O > 100 ppbv) for versions 222 and 223. The comparison with data obtained from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on the Envisat satellite yields a good agreement within 9-17 ppbv (or 10% for VMR-N2O > 100 ppbv) for the same data versions. Odin/SMR version 1.2 data show somewhat larger RMS deviations and a higher positive bias.