气候变化领域集成服务门户(CCPortal): Shelf-Break Upwelling and Productivity Over the North Kenya Banks: The Importance of Large-Scale Ocean Dynamics

CCPortal

DOI	10.1029/2019JC015519
	Shelf-Break Upwelling and Productivity Over the North Kenya Banks: The Importance of Large-Scale Ocean Dynamics
	Jacobs Z.L.; Jebri F.; Raitsos D.E.; Popova E.; Srokosz M.; Painter S.C.; Nencioli F.; Roberts M.; Kamau J.; Palmer M.; Wihsgott J.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	The North Kenya Banks (NKBs) have recently emerged as a new frontier for food security and could become an economically important fishery for Kenya with improved resources providing better accessibility. Little research has been done on the mechanisms supporting high fish productivity over the NKBs with information on annual and interannual environmental variability lacking. Here we use a high-resolution, global, biogeochemical ocean model with remote sensing observations to demonstrate that the ocean circulation exerts an important control on the productivity over the NKBs. During the Northeast Monsoon, which occurs from December to February, upwelling occurs along the Kenyan coast, which is topographically enhanced over the NKBs. Additionally, enhanced upwelling events, associated with widespread cool temperatures, elevated chlorophyll, nutrients, primary production, and phytoplankton biomass, can occur over this region. Eight such modeled events, characterized by primary production exceeding 1.3 g C/m−2/day, were found to occur during January or February from 1993–2015. Even though the upwelling is always rooted to the NKBs, the position, spatial extent, and intensity of the upwelling exhibit considerable interannual variability. The confluence zone between the Somali Current and East African Coastal Current (referred to as the Somali-Zanzibar Confluence Zone) forms during the Northeast Monsoon and is highly variable. We present evidence that when the Somali-Zanzibar Confluence Zone is positioned further south, it acts to enhance shelf-edge upwelling and productivity over the NKBs. These findings provide the first indication of the environmental controls that need to be considered when developing plans for the sustainable exploitation of the NKB fishery. ©2020. The Authors.
英文关键词	currents; fisheries; Indian Ocean; modeling; productivity; upwelling
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187019
作者单位	National Oceanography Centre, Southampton, United Kingdom; Plymouth Marine Laboratory, Plymouth, United Kingdom; National and Kapodistrian University of Athens, Athens, Greece; Nelson Mandela University, Ocean Sciences Campus, Port Elizabeth, South Africa; Kenya Marine and Fisheries Institute, Mombasa, Kenya
推荐引用方式 GB/T 7714	Jacobs Z.L.,Jebri F.,Raitsos D.E.,et al. Shelf-Break Upwelling and Productivity Over the North Kenya Banks: The Importance of Large-Scale Ocean Dynamics[J],2020,125(1).
APA	Jacobs Z.L..,Jebri F..,Raitsos D.E..,Popova E..,Srokosz M..,...&Wihsgott J..(2020).Shelf-Break Upwelling and Productivity Over the North Kenya Banks: The Importance of Large-Scale Ocean Dynamics.Journal of Geophysical Research: Oceans,125(1).
MLA	Jacobs Z.L.,et al."Shelf-Break Upwelling and Productivity Over the North Kenya Banks: The Importance of Large-Scale Ocean Dynamics".Journal of Geophysical Research: Oceans 125.1(2020).