南热带印度洋浮游植物生物量的季节性增加:气象和海洋学参数的意义

IF 2.6 3区 地球科学 Q2 OCEANOGRAPHY Oceanologia Pub Date : 2024-04-01 DOI:10.1016/j.oceano.2023.10.003
Chinnadurai Karnan, Sreedharan Gautham
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引用次数: 0

摘要

本研究的重点是了解寡营养、赤道和南热带印度洋(ESTIO;0-30°S 和 60-90°E)浮游植物生物量(叶绿素 a)分布的季节性。长期卫星数据分析(2003-2020 年)显示,海面温度(SST)、风、洋流、平均海平面异常值(MSLA)、光合可利用辐射(PAR)、透光深度(ZEU)和混合层深度(MLD)具有很强的季节性。作为对水文变化的响应,浮游植物生物量表现出明显的季节性变化,其中澳冬(AW;6 月至 9 月;平均 0.11 ± 0.03 mg/m³)生物量最高,澳夏(AS;11 月至 2 月;平均 0.07 ± 0.03 mg/m)生物量最低。高叶绿素斑块(>0.1 mg/m³)出现在南半球夏季的 0°-8°S 之间,并在南半球夏季的 0°-18°S 扩大。由于 ESTIO 北部(13°S 以北;HCD:高叶绿素 a 区域)的多年平均叶绿素 a 比南部(LCD:低叶绿素 a 区域)高(0.1 mg/m³),研究区域被分为两个区域,并对所有变量进行了分析。在高叶绿素 a 区域,叶绿素 a 的增加与风速、风压、埃克曼泵、较强的北风和西风以及气旋漩涡等变量呈正相关。这些特征可能会通过抬升温跃层和增加营养供应来刺激初级生产。在液晶区,混合层深度与叶绿素 a 的升高也呈现出很强的正相关性,这显然是因为混合层全年都很深(从而保持了较低的生物量),而且冬季的混合层深度比 HCD 更深。皮尔逊多变量相关分析和主成分分析证实,上述参数对提高 ESTIO 的叶绿素 a 具有统计学意义。
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Seasonal enhancement of phytoplankton biomass in the southern tropical Indian Ocean: Significance of meteorological and oceanography parameters

The present study focused on understanding the seasonality of the phytoplankton biomass (chlorophyll a) distribution in the oligotrophic, Equatorial, and Southern Tropical Indian Ocean (ESTIO; 0–30°S and 60–90°E). The long-term satellite data analyses (2003–2020) showed a strong seasonality in sea surface temperature (SST), wind, currents, mean sea level anomaly (MSLA), photosynthetically available radiation (PAR), euphotic depth (ZEU) and mixed layer depth (MLD). As a response to the hydrographical changes, the phytoplankton biomass showed noticeable seasonal variation with the highest biomass during the Austral Winter (AW; June–September; avg. 0.11 ± 0.03 mg/m³) and lowest during the Austral Summer (AS; November–February; avg. 0.07 ± 0.03 mg/m). High chlorophyll patches (>0.1 mg/m³) were found between 0°–8°S during the AS and expanded over 0°–18°S during the AW. As multi-year mean chlorophyll a was higher (>0.1 mg/m³) in the northern part of the ESTIO (north of ∼13°S; HCD: high chlorophyll a domain) than the southern side (LCD: low chlorophyll a domain), the study area was divided into two domains and all the variables were analysed. In the HCD, enhancement of chlorophyll a was positively correlated with variables such as wind speed, wind stress, Ekman pumping, stronger northward and westward winds, as well as the presence of cyclonic eddies. These features are likely to stimulate primary production by uplifting the thermocline and enhancing nutrient supply. In the LCD, mixed layer depth also showed a strong positive correlation with elevated chlorophyll a, apparently because it is deep throughout the year (thereby keeping lower biomass) and deepens more strongly in winter than in the HCD. Another contrast with the HCD is that the cyclonic eddies appear to be insufficiently abundant to influence its chlorophyll a. Pearson's multivariable correlation analysis and principle component analysis confirmed the statistical significance of the above parameters on the enhancement of chlorophyll a in the ESTIO.

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来源期刊
Oceanologia
Oceanologia 地学-海洋学
CiteScore
5.30
自引率
6.90%
发文量
63
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.
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