An improved tropospheric NO 2 retrieval for OMI observations in the vicinity of mountainous terrain
An improved tropospheric NO 2 retrieval for OMI observations in the vicinity of mountainous terrain
复制标题
山区附近 OMI 观测的改进对流层 NO 2 反演
DOI：
10.5194/amt-2-401-2009
复制
发表时间：
2009
影响因子：
3.8
通讯作者：
Ping Wang
中科院分区：
文献类型：
--
作者：
Yipin Zhou;D. Brunner;K. Boersma;R. Dirksen;Ping Wang
抽象的。我们提出了一种方法来减少从山区附近的臭氧监测仪器 (OMI) 检索到的 NO2 垂直对流层柱 (VTC) 与地形相关的误差。这对于可靠估计我们感兴趣的特定区域、阿尔卑斯地区和邻近平面的空气污染水平至关重要，在这些区域，荷兰 OMI NO2 产品 (DOMINO) 由于检索中使用的表面参数的粗分辨率而表现出显着的偏差。我们的方法使用高分辨率地形数据集，用精确的像素平均值取代了粗网格表面压力，并相应地缩放了先验的 NO2 剖面。以这种方式对 2006-2007 年期间的 NO2 VTC 进行再处理表明，在晴空条件下，多米诺在冬季低估了意大利波河流域和瑞士高原上空的 NO2 约 15-20%，在夏季低估了 5%（云辐射分数）
Abstract. We present an approach to reduce topography-related errors of vertical tropospheric columns (VTC) of NO2 retrieved from the Ozone Monitoring Instrument (OMI) in the vicinity of mountainous terrain. This is crucial for reliable estimates of air pollution levels over our particular area of interest, the Alpine region and the adjacent planes, where the Dutch OMI NO2 product (DOMINO) exhibits significant biases due to the coarse resolution of surface parameters used in the retrieval. Our approach replaces the coarse-gridded surface pressures by accurate pixel-average values using a high-resolution topography data set, and scales the a priori NO2 profiles accordingly. NO2 VTC reprocessed in this way for the period 2006–2007 suggest that NO2 over the Po Valley in Italy and over the Swiss plateau is underestimated by DOMINO by about 15–20% in winter and 5% in summer under clear-sky conditions (cloud radiance fraction