马来西亚北婆罗洲利卡斯河口CDOM吸附特性及其组成的动力学研究

IF 2.6 3区地球科学 Q2 OCEANOGRAPHY

Oceanologia Pub Date : 2022-10-01 DOI:10.1016/j.oceano.2022.04.005

Saiyidah Munirah Mohd-Shazali , Jafar-Sidik Madihah , Nurzaliah Ali , Chen Cheng-Ann , Robert J.W. Brewin , Md. Suffian Idris , P. Purba Noir

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引用次数: 1

摘要

色性溶解有机物(CDOM)是水生生态系统中重要的水成分，它有助于水的颜色，影响光的穿透，并影响初级生产。本研究旨在确定Likas河口CDOM吸收特性的空间和季风变异，表征CDOM的来源，并探讨CDOM吸收特性与盐度的相关性。利卡斯河口是位于沙巴州西海岸哥打京那巴鲁市的一个小河口，面向南中国海。红树林生态系统围绕着住宅区和公共设施等人造结构。从2018年6月至2019年7月，每个月在春潮期间在河流上游至河口和沿海地区的19个站点采集地表水样本，为期14个月。aCDOM(440)在研究区内的分布可预测为沿海地区的特征，从上游向沿海水域呈递减梯度(0.29±0.19 m−1至1.05±0.39 m−1)。光谱斜率s275 ~ 295和sr的空间格局呈上升趋势，而s350 ~ 400和s300 ~ 600的空间梯度从上游向近海呈下降趋势。因此，S300-600表明aCDOM(440)与沿海水域非常规结果之间存在线性关系。我们怀疑这是由于研究地点的覆盖范围很小，每个站点的间隔为0.5 m。这可能就是为什么S300-600在整个研究区域具有恒定值的原因(站之间没有统计差异)。此外，S300-600仅在河口和沿海水域的监测站有所不同。基于光谱斜率比(SR)，位于Darau、Inanam和Bangka-Bangka河的大部分站点SR值小于1。因此，这些台站中的CDOM是一个以地面为主的源。因此，从我们在研究期间的观测来看，季风变化可能会改变研究区CDOM的来源。

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Dynamics of absorption properties of CDOM and its composition in Likas estuary, North Borneo, Malaysia

Chromophoric Dissolved Organic Matter (CDOM) is a vital water constituent in aquatic ecosystems that contributes to water colour, affects light penetration, and impacts primary production. This study aims to determine the spatial and monsoonal variability of CDOM absorption properties in the Likas estuary, characterise the source of CDOM, and investigate the correlations between CDOM absorption properties and salinity. Likas estuary is a small estuary located in Kota Kinabalu city on the west coast of Sabah, facing the South China Sea. A mangrove ecosystem surrounds it with manufactured structures such as residential areas and public facilities. Surface water samples were collected at 19 stations: upstream of rivers to the river mouth and coastal area during spring tides every month, from June 2018 to July 2019, for 14-months. The distribution of a_CDOM(440) in the study area is predictable as a signature in a coastal area with a decreasing gradient from the upstream towards coastal water (0.29 ± 0.19 m⁻¹ to 1.05 ± 0.39 m⁻¹). There are increasing spatial patterns of spectral slopes S_275-295 and S_R. However, S_350-400 and S_300-600 declined spatial gradients from the upstream to coastal water. Thus, S_300-600 indicates a linear relationship between a_CDOM(440), which unconventional results in coastal water. We suspect this is due to a small coverage of the study site with a distance of 0.5 m intervals of each station. This could be why the S_300-600 had constant values throughout the study area (with no statistical difference between stations). In addition, S_300-600 was merely varied in the stations located at the river mouth and coastal water. Based on the spectral slope ratio (S_R), most of the stations located in the Darau, Inanam, and Bangka-Bangka rivers had S_R values less than 1. Hence, CDOM in these stations is a terrestrial-dominated source. Therefore, from our observations during the study period, monsoonal variation could alter the source of CDOM in the study area.

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来源期刊

Oceanologia 地学-海洋学

CiteScore

5.30

自引率

6.90%

发文量

审稿时长

146 days

期刊介绍： Oceanologia is an international journal that publishes results of original research in the field of marine sciences with emphasis on the European seas.