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MARINE METEOROLOGY

机译:海洋气象

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摘要

The spaceborne advanced very high resolution radiometer (AVHRR) sensor data record is approaching 40 years, providing a crucial asset for studying long-term trends of aerosol properties regionally and globally. However, due to limitations of its channels' information content, aerosol optical depth (AOD) data from AVHRR over land are still largely lacking. In this paper, we describe a new physics-based algorithm to retrieve aerosol loading over both land and ocean from AVHRR for the first time. The over-land algorithm is an extension of our Sea-viewing Wide Field-of-view Sensor and Moderate Resolution Imaging Spec-troradiometer (MODIS) Deep Blue algorithm, while a simplified version of our Satellite Ocean Aerosol Retrieval algorithm is used over ocean. We compare retrieved AVHRR AOD with that from MODIS on a daily and seasonal basis and find, in general, good agreement between the two. For the satellites with equatorial crossing times within 2 h of solar noon, the spatial coverage of the AVHRR aerosol product is comparable to that of MODIS, except over very bright arid regions (such as the Sahara), where the underlying surface reflectance at 630 nm reaches the critical surface reflectance. Based upon comparisons of the AVHRR AOD against Aerosol Robotic Network data, preliminary results indicate that the expected error confidence interval envelope is around ±(0.03 + 15%) over ocean and ±(0.05 + 25%) over land for this first version of the AVHRR aerosol products. Consequently, these new AVHRR aerosol products can contribute im- portant building blocks for constructing a consistent long-term data record for climate studies.
机译:太空先进的超高分辨率辐射计(AVHRR)传感器数据记录已接近40年,为研究区域和全球气溶胶特性的长期趋势提供了至关重要的资产。但是,由于其通道信息内容的限制,仍然大大缺乏来自AVHRR在陆地上的气溶胶光学深度(AOD)数据。在本文中,我们首次描述了一种基于物理的新算法,可从AVHRR中检索陆地和海洋上的气溶胶负荷。陆上算法是对我们的海景宽视场传感器和中等分辨率成像光谱辐射计(MODIS)深蓝算法的扩展,而对我们的“卫星海洋气溶胶检索”算法的简化版本则用于海洋。我们将每天和季节性比较从AVDIS检索到的AVHRR AOD与MODIS,总体上发现两者之间有很好的一致性。对于在太阳正午2小时内具有赤道穿越时间的卫星,AVHRR气溶胶产品的空间覆盖范围与MODIS相当,除了在非常明亮的干旱区域(例如撒哈拉沙漠)上,其潜在的表面反射率为630 nm达到临界表面反射率。根据AVHRR AOD与Aerosol机器人网络数据的比较,初步结果表明,对于该版本的第一个版本,预期的误差置信区间包络在海洋上约为±(0.03 + 15%),在陆地上约为±(0.05 + 25%)。 AVHRR气雾剂产品。因此,这些新的AVHRR气雾剂产品可为构建一致的长期气候研究数据记录做出重要贡献。

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  • 来源
    《Oceanographic Literature Review》 |2017年第12期|2549-2573|共25页
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