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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Evaluation and Wind Speed Dependence of MODIS Aerosol Retrievals Over Open Ocean
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Evaluation and Wind Speed Dependence of MODIS Aerosol Retrievals Over Open Ocean

机译：海洋上MODIS气溶胶检索的评估和风速相关性

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摘要

The Maritime Aerosol Network (MAN) data set provides high-quality ground truth to validate the Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol product over open ocean. Prior validation of the ocean aerosol product has been limited to coastal and island sites. Comparing MODIS Collection 5 ocean aerosol retrieval products with collocated MAN measurements from ships shows that MODIS is meeting the prelaunch uncertainty estimates for aerosol optical depth (AOD) with 64% and 67% of retrievals at 550 nm and 74% and 78% of retrievals at 870 nm, falling within expected uncertainty for Terra and Aqua, respectively. Angstrom exponent comparisons show a high correlation between MODIS retrievals and shipboard measurements ($R = 0.85$ for Terra and 0.83 for Aqua), although the MODIS aerosol algorithm tends to underestimate particle size for large particles and overestimate size for small particles, as seen in earlier collections. Prior analysis noted an offset between Terra and Aqua ocean AODs, without concluding which sensor was more accurate. The simple linear regression reported here is consistent with other anecdotal evidence that Aqua agreement with the Aerosol Robotic Network is marginally better. However, we cannot claim based on the current study that the better Aqua comparison is statistically significant. A systematic increase of error as a function of wind speed is noted in both Terra and Aqua retrievals. This wind speed dependence enters the retrieval when winds deviate from the 6-m/s value assumed in the rough ocean surface and white cap parameterizations. Wind speed dependence in the results can be mitigated by using auxiliary National Centers for Environmental Prediction wind speed information in the retrieval process.
机译：海上气溶胶网络（MAN）数据集提供了高质量的地面真相，以验证公海中中等分辨率成像光谱辐射计（MODIS）气溶胶产品。先前对海洋气溶胶产品的验证仅限于沿海和岛屿地区。将MODIS Collection 5海洋气溶胶回收产品与船舶的并置MAN测量值进行比较，表明MODIS满足了发射前对气溶胶光学深度（AOD）的不确定性估计，其中在550 nm处分别有64％和67％的回收量，在74 nm和78％时回收了78％ 870 nm，分别在Terra和Aqua的预期不确定性范围内。 Angstrom指数比较表明，MODIS气溶胶算法倾向于低估大颗粒的粒径，而高估小颗粒的粒径，尽管MODIS气溶胶算法往往会低估大颗粒的粒径，而小颗粒的粒径会高估，但MODIS检索与船上测量值之间的相关性很高（Terra为0.85 $，Aqua为0.83）。较早的收藏。先前的分析指出Terra和Aqua海洋AOD之间存在偏差，但没有得出哪种传感器更准确的结论。此处报告的简单线性回归与其他轶事证据一致，即Aqua与Aerosol机器人网络的协议略好。但是，根据当前的研究，我们不能声称更好的Aqua比较具有统计学意义。在Terra和Aqua检索中都注意到误差是系统随风速而增加的。当风偏离粗糙海面和白帽参数化中假定的6-m / s值时，这种风速相关性便进入检索。可以通过在检索过程中使用辅助的国家环境预测中心风速信息来缓解结果中的风速依赖性。

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