Seasonal variation of chlorophyll-a in South Java over the past quarter-century

IF 2.2 3区 地球科学 Q2 OCEANOGRAPHY
Yusuf Jati Wijaya, Ulung Jantama Wisha, Lilik Maslukah, Seto Windarto, Anindya Wirasatriya, Muhammad Zainuri
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Abstract

A comprehensive investigation was conducted to examine the variations in Chlorophyll-a (Chl-a) levels in the waters located to the south of Java Island throughout the past quarter-century. This study employs satellite data and reanalysis data gathered from multiple sources spanning the period between September 1997 and December 2022. The application of EOF analysis revealed that the most notable elevation in Chl-a contents took place during the seasons of SON (September, October, November) and DJF (December, January, February) in the years 1997/1998 and 2006/2007. It has been determined that this significant increase in Chl-a content in southern Java is contingent upon the fulfillment of a number of circumstances. These conditions are associated with climatic patterns in the Indian Ocean and Pacific Ocean. An elevation in Chl-a content was seen throughout the months of SON and DJF in instances where the Indian Ocean Dipole (IOD) had a positive phase. The concurrent occurrence of a powerful positive IOD and El Niño event in the Pacific Ocean is highly probable to result in a substantial elevation in Chl-a content in the southern region of Java. In addition, our findings indicate that the phenomenon of Kelvin wave upwelling significantly contributes to the elevation of Chl-a levels during the months of June, July, August (JJA), and SON.

Abstract Image

过去四分之一世纪南爪哇岛叶绿素-a 的季节性变化
为研究爪哇岛南部水域叶绿素-a(Chl-a)水平在过去四分之一个世纪中的变化情况,我们开展了一项综合调查。这项研究采用了从多个来源收集的卫星数据和再分析数据,时间跨度为 1997 年 9 月至 2022 年 12 月。应用 EOF 分析发现,在 1997/1998 年和 2006/2007 年的 SON 季节(9 月、10 月、11 月)和 DJF 季节(12 月、1 月、2 月),Chl-a 含量上升最为显著。研究发现,爪哇岛南部 Chl-a 含量的显著增加取决于一系列条件。这些条件与印度洋和太平洋的气候模式有关。在印度洋偶极子(IOD)呈正相的整个 SON 月和 DJF 月,Chl-a 含量都有所上升。印度洋偶极子和太平洋厄尔尼诺现象同时出现,极有可能导致爪哇南部地区的 Chl-a 含量大幅上升。此外,我们的研究结果表明,在 6 月、7 月、8 月(JJA)和 SON 月期间,开尔文波上升流现象极大地促进了 Chl-a 含量的升高。
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来源期刊
Ocean Dynamics
Ocean Dynamics 地学-海洋学
CiteScore
5.40
自引率
0.00%
发文量
37
审稿时长
6-12 weeks
期刊介绍: Ocean Dynamics is an international journal that aims to publish high-quality peer-reviewed articles in the following areas of research: Theoretical oceanography (new theoretical concepts that further system understanding with a strong view to applicability for operational or monitoring purposes); Computational oceanography (all aspects of ocean modeling and data analysis); Observational oceanography (new techniques or systematic approaches in measuring oceanic variables, including all aspects of monitoring the state of the ocean); Articles with an interdisciplinary character that encompass research in the fields of biological, chemical and physical oceanography are especially encouraged.
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