globalchange  > 气候减缓与适应
DOI: 10.1029/2018JC014334
WOS记录号: WOS:000461856400021
论文题名:
Long-Term Trends in Phytoplankton Chlorophyll a and Size Structure in the Benguela Upwelling System
作者: Lamont, T.1,2,3; Barlow, R. G.2,3,4; Brewin, R. J. W.5,6
通讯作者: Lamont, T.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN: 2169-9275
EISSN: 2169-9291
出版年: 2019
卷: 124, 期:2, 页码:1170-1195
语种: 英语
英文关键词: Benguela Upwelling System ; SeaWiFS ; MODIS-Aqua ; phytoplankton biomass ; size structure ; long-term trends
WOS关键词: MARINE PRIMARY PRODUCTION ; SOUTHERN BENGUELA ; CLIMATE-CHANGE ; OCEAN CHLOROPHYLL ; BIOLOGICAL PRODUCTION ; SEASONAL-VARIATION ; AGULHAS SYSTEM ; SATELLITE DATA ; MIXED-LAYER ; VARIABILITY
WOS学科分类: Oceanography
WOS研究方向: Oceanography
英文摘要:

The Benguela Upwelling System (BUS) is among the most productive ecosystems globally, supporting numerous fisheries and ecosystem services in Southern Africa. Sea-viewing Wide Field-of-view Sensor and Moderate-resolution Imaging Spectroradiometer-Aqua chlorophyll a (Chla) concentrations between September 1997 and February 2018 were used to investigate long-term trends in phytoplankton biomass and size structure (microphytoplankton [>20m], nanophytoplankton [2-20m], and picophytoplankton [<2m]) in the Northern Benguela, Southern Benguela (SB), and Agulhas Bank (AB) shelf and open ocean regions of the BUS. Trends in upwelling and correlations with Chla and size structure were examined. Increasing Chla and microphytoplankton trends occurred in the Northern Benguela shelf and open ocean, while decreases were evident on the SB shelf in all seasons. In the SB open ocean, small increases occurred during austral winter, with a decrease in spring. On the AB shelf, increases in Chla and microphytoplankton occurred in summer with decreases during the other seasons. Patterns differed in the AB open ocean, with increases in winter and spring and decreases in summer and autumn. Although R-2 values indicated that linear trends accounted for a reasonable portion of the variance, and most trends were statistically significant, they showed only small changes on the shelf domains and little to no change in the open ocean. Strong correlations between upwelling, Chla, and the size classes were observed, but distinct seasonal differences occurred in each region. This is the first 20-year analysis of phytoplankton biomass and community structure in the BUS and provides a baseline against which future changes can be monitored.


Plain Language Summary Two satellite ocean color data products were combined and used to examine trends in chlorophyll a and the proportions of microphytoplankton, nanophytoplankton, and picophytoplankton in three subregions of the Benguela Upwelling System, namely, the northern Benguela, southern Benguela, and Agulhas Bank. These trends were related to trends in upwelling-favorable winds and significant correlations were observed but with distinct seasonal differences in each region. Linear trends were mostly significant and accounted for a reasonable portion of the variance, but they showed only small changes on the shelf domains and little to no change in the open ocean regions. This study provides the first 20-year analysis of phytoplankton biomass and community structure in the Benguela Upwelling System and provides a baseline against which future changes can be monitored.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/128843
Appears in Collections:气候减缓与适应

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作者单位: 1.Dept Environm Affairs, Oceans & Coasts Res, Cape Town, South Africa
2.Univ Cape Town, Marine Res Inst, Rondebosch, South Africa
3.Univ Cape Town, Dept Oceanog, Rondebosch, South Africa
4.Bayworld Ctr Res & Educ, Cape Town, South Africa
5.PML, Plymouth, Devon, England
6.Natl Ctr Earth Observat, PML, Plymouth, Devon, England

Recommended Citation:
Lamont, T.,Barlow, R. G.,Brewin, R. J. W.. Long-Term Trends in Phytoplankton Chlorophyll a and Size Structure in the Benguela Upwelling System[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019-01-01,124(2):1170-1195
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