Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation
Tropospheric ozone and ozone profiles retrieved from GOME-2 and their validation
复制标题
从 GOME-2 检索的对流层臭氧和臭氧剖面及其验证
DOI：
10.5194/amt-8-385-2015
复制
发表时间：
2014
影响因子：
3.8
通讯作者：
N. Richards
中科院分区：
文献类型：
--
作者：
G. Miles;R. Siddans;B. Kerridge;B. Latter;N. Richards
抽象的。本文介绍和评估的RAL（卢瑟福阿普尔顿实验室）的臭氧廓线反演方案的全球臭氧监测实验2（GOME-2），重点是对流层臭氧的性能。概述了该方案应用于GOME-1测量以来的发展情况。其中包括为充分考虑哈特利波段紫外辐射衰减和哈金斯波段仪器参数知识不足而制定的方法，以实现提取对流层臭氧信息所需的高精度光谱拟合。该评估包括对照两年（2007-2008年）期间在世界范围内取样的臭氧探测仪进行验证。相对于探测器的合奏的标准偏差是相当低的检索配置文件比先验的，除了最低的子列。一旦将反演垂直平滑（平均核）应用于探空仪剖面，对流层下部的反演偏差为6%（1.5 DU），上面子列中的偏差较小。对流层中的偏差随纬度而变化。反演低估了南半球对流层低层臭氧（15-20%或~ 1-3 DU），高估了北方半球（10%或2 DU）。的检索，以反映低对流层臭氧的地理分布的能力，全球范围内（而不仅仅是臭氧探测器发射场）的化学传输模型TOMCAT的比较证明。对于月平均的GOME-2云清除像元，相关性为0.66之间的检索和TOMCAT采样相应的，与0.7多布森单位的偏差。GOME-2估计NH污染中心的浓度较高，但南大洋和南太平洋的臭氧浓度较低，这与臭氧探测仪的比较结果一致。
Abstract. This paper describes and assesses the performance of the RAL (Rutherford Appleton Laboratory) ozone profile retrieval scheme for the Global Ozone Monitoring Experiment 2 (GOME-2) with a focus on tropospheric ozone. Developments to the scheme since its application to GOME-1 measurements are outlined. These include the approaches developed to account sufficiently for UV radiometric degradation in the Hartley band and for inadequacies in knowledge of instrumental parameters in the Huggins bands to achieve the high-precision spectral fit required to extract information on tropospheric ozone. The assessment includes a validation against ozonesondes (sondes) sampled worldwide over 2 years (2007–2008). Standard deviations of the ensemble with respect to the sondes are considerably lower for the retrieved profiles than for the a priori, with the exception of the lowest subcolumn. Once retrieval vertical smoothing (averaging kernels) has been applied to the sonde profiles there is a retrieval bias of 6% (1.5 DU) in the lower troposphere, with smaller biases in the subcolumns above. The bias in the troposphere varies with latitude. The retrieval underestimates lower tropospheric ozone in the Southern Hemisphere (SH) (15–20% or ~ 1–3 DU) and overestimates it in the Northern Hemisphere (NH) (10% or 2 DU). The ability of the retrieval to reflect the geographical distribution of lower tropospheric ozone, globally (rather than just ozonesonde launch sites) is demonstrated by comparison with the chemistry transport model TOMCAT. For a monthly mean of cloud-cleared GOME-2 pixels, a correlation of 0.66 is found between the retrieval and TOMCAT sampled accordingly, with a bias of 0.7 Dobson Units. GOME-2 estimates higher concentrations in NH pollution centres but lower ozone in the Southern Ocean and South Pacific, which is consistent with the comparison to ozonesondes.
影响因子：
4.9
作者：
Hollaway, M. J.;Arnold, S. R.;Emberson, L. D.
通讯作者：
Emberson, L. D.