Assessing the Impact of Various Controlling Factors on Chlorophyll Concentration in the Arabian Sea Using Remotely Sensed Observations

Thalassas: An International Journal of Marine Sciences Pub Date : 2024-03-15 DOI:10.1007/s41208-024-00676-4

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Abstract

Present work examines a long-term trend (2003–2020) of the chlorophyll-a concentration and impact of various controlling factors on it in the Arabian Sea using robust non-parametric Man Kendall analysis, two-way ANOVA statistical test, and two-stage least square regression technique. Climatological means and interannual variations of chlorophyll-a (Chl_a) concentration and other controlling factors viz. Sea surface temperature (SST), Aerosol optical depth (AOD) and sea surface wind (SSW) have been analysed. From the seasonal variation of Chl_a and AOD it is observe that the highest Chl_a (1.4 mg/m³) is observed during July, August, September and October, and the highest AOD (0.8) is observed during June, July, August and September over the Arabian Sea. There was a two-month delay in the peak concentration of Chl_a/AOD, SSW; however, one month delay is observed in the peak concentration of Chl_a/SST in the Arabian Sea. A long-term trend of Chl_a concentration and SSW shows a decreasing trend, whereas SST and AOD show an increasing trend in the Arabian Sea. From ANOVA and two-stage least square regression it is observed that SST plays a significant role in influencing the decreasing trend of Chl_a in comparison to the other two controlling factors (AOD and SSW). A rise of 1% in SST results into a decrease of 0.138 percentage point in Chl_a concentration that is statistically significant at 1% significance level. The present work helps to understand the impact of various controlling factors on the ocean's primary productivity and the effect of climate change on the marine ecosystem.

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利用遥感观测数据评估各种控制因素对阿拉伯海叶绿素浓度的影响

摘要本研究采用稳健的非参数 Man Kendall 分析、双向方差分析统计检验和两阶段最小平方回归技术，研究了阿拉伯海叶绿素-a 浓度的长期趋势（2003-2020 年）以及各种控制因素对其的影响。分析了叶绿素-a（Chl_a）浓度的气候学平均值和年际变化，以及其他控制因素，即海面温度（SST）、气溶胶光学深度（AOD）和海面风（SSW）。从 Chl_a 和 AOD 的季节性变化可以看出，阿拉伯海的 Chl_a 在 7 月、8 月、9 月和 10 月最高（1.4 毫克/立方米），AOD 在 6 月、7 月、8 月和 9 月最高（0.8）。在西南海域，Chl_a/AOD 的峰值浓度延迟了两个月；但在阿拉伯海，Chl_a/SST 的峰值浓度延迟了一个月。阿拉伯海的 Chl_a 浓度和 SSW 长期趋势呈下降趋势，而 SST 和 AOD 则呈上升趋势。从方差分析和两阶段最小二乘法回归中可以看出，与其他两个控制因子（AOD 和 SSW）相比，SST 在影响 Chl_a 浓度下降趋势方面起着重要作用。SST 上升 1%，Chl_a 浓度下降 0.138 个百分点，在 1%的显著性水平上具有统计学意义。本研究有助于了解各种控制因素对海洋初级生产力的影响以及气候变化对海洋生态系统的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Thalassas: An International Journal of Marine Sciences

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