亚北极太平洋气溶胶光学厚度与净初级生产力的变化特征及其相关性研究

摘要/Abstract

摘要： 为了解亚北极太平洋大气对海洋的长期影响, 利用 2003–2018 年 MODIS 卫星遥感数据, 对部分区域 (40◦ N∼50◦ N, 160◦ E∼160◦ W) 进行研究。将研究区域按照经度每 10◦ 划分为 4 个子域进行比较研究, 分析了各区域气溶胶光学厚度 (AOD) 和海洋净初级生产力 (NPP) 的变化特征及相关性。结果表明各区域 AOD 及 NPP 均具有年际周期性, AOD 于 7 月达到峰值, NPP 于 8、9 月达到峰值, 且二者均存在明显的自西向东递减趋势。根据时滞相关性分析发现, 各区域 AOD 均与滞后 1∼2 个月的 NPP 有较强相关性, 自西向东四个研究子域的最高 Pearson 相关系数分别为 0.75、0.84、0.79、0.74。利用 7 月 AOD 峰值对气溶胶进行分类, 发现沙尘为影响该区域 NPP 的重要气溶胶类型。对各区域的海表温度 (SST) 和光合有效辐射 (PAR) 的研究发现, 二者均无明显的自西向东变化趋势, 较好地排除了这两种因素对 NPP 自西向东趋势的影响。

关键词: 亚北极太平洋, 气溶胶光学厚度, 海洋净初级生产力, 中分辨率成像光谱仪, 相关性分析

Abstract: The long-term impact of aerosol on ocean in the subarctic Pacific was investigated based on satellite remote sensing data from MODIS (2003–2018). The spatial, temporal distributions of aerosol optical depth (AOD) and marine net primary productivity (NPP) and their correlations in the area of interest divided into four areas every 10◦ in longitude in the subarctic Pacific (40◦ N∼50◦ N, 160◦ E∼160◦ W) were analyzed and compared. The results show that AOD and NPP in each ares vary seasonally, with AOD peaking in July and NPP peaking in August or September, and both of them have an obvious decreasing trend from west to east. According to the delay correlation analysis of the monthly-averaged long time series data, it is found that AOD in each area has a strong correlation with NPP with a lag of 1–2 months, and the highest Pearson correlation coefficients of the four aeras from west to east are 0.75, 0.84, 0.79 and 0.74, respectively. Through the classification of aerosol according to the AOD peak in July, it is found that dust is an important aerosol type affecting NPP in this area. And it is also found that there is no obvious change trend from west to east for sea surface temperature (SST) and photosynthetically available radiation (PAR) in each area, which effectively excluded their influence on the spatial variation trend of NPP from west to east.

Key words: subarctic Pacific, aerosol optical depth, net primary productivity, moderate-resolution imaging spectroradiometer, correlation analysis

中图分类号:

王雪林, 陈文忠∗. 亚北极太平洋气溶胶光学厚度与净初级生产力的变化特征及其相关性研究[J]. 大气与环境光学学报, 2022, 17(5): 558-569.

WANG Xuelin, CHEN Wenzhong ∗. Variation characteristics and correlation between aerosol optical depth and net primary productivity in subarctic Pacific[J]. Journal of Atmospheric and Environmental Optics, 2022, 17(5): 558-569.

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