永兴岛涡动相关数据处理与质量评价

发布时间：2018-10-21 16:25

【摘要】：基于永兴岛2016年2月份实测涡动原始数据,用Eddy Pro软件进行数据后处理,并对各处理步骤前、后进行定量比较分析,进一步对通量计算结果进行质量分级评价、足迹分析,最后对分别使用Eddy Pro软件和Easy Flux_DL在线计算程序得到通量结果进行比较。结果表明,野点剔除、坐标旋转、频率补偿和空气密度修正均会影响涡动相关通量的计算结果。野点剔除在动量和感热通量的计算中无明显影响,在潜热和二氧化碳通量计算中则不可忽略。坐标旋转使动量、潜热和二氧化碳通量分别增加了11.28%、7.36%和18.53%。空气密度效应校正(WPL校正)对二氧化碳通量计算影响显著,经空气密度修正后降低了7.87%。总体质量评价结果为,动量、感热、潜热和二氧化碳通量中高质量数据(1~3级)所占比例分别为90.29%、90.22%、88.46%和85.41%。源区分析表明,72.04%的通量数据落在第一兴趣源区(北至东北方向10°~80°,平均水深超过10m的海洋下垫面)。Eddy Pro和Easy Flux两者的整体趋势一致,Eddy Pro引入更加严格的野点剔除指标,得到的结果偏小,但更可靠精确。
[Abstract]:Based on the measured vortex data of Yongxing Island in February 2016, the data post-processing was carried out with Eddy Pro software, and the quantitative comparison and analysis were carried out before and after each processing step, and the results of flux calculation were further evaluated by quality grading and footprint analysis. Finally, the flux results obtained by using Eddy Pro software and Easy Flux_DL online calculation program are compared. The results show that the elimination of outliers, rotation of coordinates, frequency compensation and air density correction will affect the calculation results of vortex-related fluxes. The elimination of outliers has no obvious effect on the calculation of momentum and sensible heat flux, but can not be neglected in the calculation of latent heat and carbon dioxide flux. Coordinate rotation increases momentum latent heat and carbon dioxide flux by 11.287.36% and 18.53% respectively. Air density effect correction (WPL correction) has a significant effect on the calculation of carbon dioxide flux, which is reduced by 7.87% after air density correction. The results of overall quality evaluation show that the proportion of high quality data (grade 1 ~ 3) in momentum, sensible heat, latent heat and carbon dioxide flux is 90.29 / 90.22% and 85.41% respectively. The source analysis shows that 72.04% of the flux data fall in the first source of interest (10 掳~ 80 掳from north to northeast, with an average water depth of more than 10 m). The overall trend of). Eddy Pro and Easy Flux is consistent with that of, Eddy Pro. The results obtained are small, but more reliable and accurate.
【作者单位】：热带海洋环境国家重点实验室(中国科学院南海海洋研究所);中国科学院大学;中国海洋大学;中国科学院深海科学与工程研究所;
【基金】：中国科学院野外台站网络建设项目-西沙海洋观测站(KZCX2-YW-Y202);中国科学院关键技术人才项目-2016~~
【分类号】：P732

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