A semianalytical algorithm for quantitatively estimating sediment and atmospheric deposition flux from MODIS‐derived sea ice albedo in the Bohai Sea, China
A semianalytical algorithm for quantitatively estimating sediment and atmospheric deposition flux from MODIS‐derived sea ice albedo in the Bohai Sea, China
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DOI：
10.1002/2015jc011067
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发表时间：
2016-05
影响因子：
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通讯作者：
Xu Zhan-tang;Shuibo Hu;Guifen Wang;Jun Zhao;Yuezhong Yang;W. Cao;P. Lu
中科院分区：
文献类型：
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作者：
Xu Zhan-tang;Shuibo Hu;Guifen Wang;Jun Zhao;Yuezhong Yang;W. Cao;P. Lu
海冰颗粒物（PM）浓度的遥感定量估算有助于研究海冰的泥沙输运和大气降尘通量。在这项研究中，测量的脏和估计的干净的海冰之间的差异进行了计算，并发现使用现场和实验室测量的海冰之间的差异和PM浓度之间的关系。建立了海冰PM浓度估算的半解析算法。然后将该算法应用于中国渤海的MODIS数据。MODIS得出的PM浓度和现场测量的PM浓度之间的比较显示出良好的协议，平均绝对百分比差异为31.2%。从2005年到2010年，在1月初，MODIS得出的年平均PM浓度约为0.025 g/L。经过一个月的大气降尘后，上升到0.038g/L大气尘埃沉降通量估计为2.50吨/公里（2）/月，与先前研究报告的2.20吨/公里（2）/月相似。将结果与附近地面站的现场测量结果进行了比较。地面站靠近工业区和居民区，那里的灰尘沉积量比海洋中的大，但尽管两组数据的绝对量级之间存在差异，但它们显示出相似的趋势。
Quantitative estimates of particulate matter [ PM) concentration in sea ice using remote sensing data is helpful for studies of sediment transport and atmospheric dust deposition flux. In this study, the difference between the measured dirty and estimated clean albedo of sea ice was calculated and a relationship between the albedo difference and PM concentration was found using field and laboratory measurements. A semianalytical algorithm for estimating PM concentration in sea ice was established. The algorithm was then applied to MODIS data over the Bohai Sea, China. Comparisons between MODIS derived and in situ measured PM concentration showed good agreement, with a mean absolute percentage difference of 31.2%. From 2005 to 2010, the MODIS-derived annual average PM concentration was approximately 0.025 g/L at the beginning of January. After a month of atmospheric dust deposition, it increased to 0.038 g/L. Atmospheric dust deposition flux was estimated to be 2.50 t/km(2)/month, similar to 2.20 t/km(2)/month reported in a previous study. The result was compared with on-site measurements at a nearby ground station. The ground station was close to industrial and residential areas, where larger dust depositions occurred than in the sea, but although there were discrepancies between the absolute magnitudes of the two data sets, they demonstrated similar trends.