气候变化领域集成服务门户(CCPortal): Drivers of Biogeochemical Variability in a Central California Kelp Forest: Implications for Local Amelioration of Ocean Acidification

CCPortal

DOI	10.1029/2020JC016320
	Drivers of Biogeochemical Variability in a Central California Kelp Forest: Implications for Local Amelioration of Ocean Acidification
	Hirsh H.K.; Nickols K.J.; Takeshita Y.; Traiger S.B.; Mucciarone D.A.; Monismith S.; Dunbar R.B.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	Kelp forests are among the world's most productive marine ecosystems, and they have the potential to locally ameliorate ocean acidification (OA). In order to understand the contribution of kelp metabolism to local biogeochemistry, we must first quantify the natural variability and the relative contributions of physical and biological drivers to biogeochemical changes in space and time. We deployed an extensive instrument array in Monterey Bay, CA, inside and outside of a kelp forest to assess the degree to which giant kelp (Macrocystis pyrifera) locally ameliorates present-day acidic conditions which we expect to be exacerbated by OA. Temperature, pH, and O2 variability occurred at semidiurnal, diurnal (tidal and diel), and longer upwelling event periods. Mean conditions were driven by offshore wind forcing and the delivery of upwelled water via nearshore internal bores. While near-surface pH and O2 were similar inside and outside the kelp forest, surface pH was elevated inside the kelp compared to outside, suggesting that the kelp canopy locally increased surface pH. We observed the greatest acidification stress deeper in the water column where pCO2 reached levels as high as 1,300 μatm and aragonite undersaturation (ΩAr < 1) occurred on several occasions. At this site, kelp canopy modification of seawater properties, and thus any ameliorating effect against acidification, is greatest in a narrow band of surface water. The spatial disconnect between stress exposure at depth and reduction of acidification stress at the surface warrants further assessment of utilizing kelp forests as provisioners of local OA mitigation. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	biogeochemistry; kelp forest; ocean acidification; pH; spatiotemporal variability; 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/186598
作者单位	Department of Earth System Science, Stanford University, Stanford, CA, United States; Department of Biology, California State University, Northridge, Northridge, CA, United States; Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States; Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States
推荐引用方式 GB/T 7714	Hirsh H.K.,Nickols K.J.,Takeshita Y.,et al. Drivers of Biogeochemical Variability in a Central California Kelp Forest: Implications for Local Amelioration of Ocean Acidification[J],2020,125(11).
APA	Hirsh H.K..,Nickols K.J..,Takeshita Y..,Traiger S.B..,Mucciarone D.A..,...&Dunbar R.B..(2020).Drivers of Biogeochemical Variability in a Central California Kelp Forest: Implications for Local Amelioration of Ocean Acidification.Journal of Geophysical Research: Oceans,125(11).
MLA	Hirsh H.K.,et al."Drivers of Biogeochemical Variability in a Central California Kelp Forest: Implications for Local Amelioration of Ocean Acidification".Journal of Geophysical Research: Oceans 125.11(2020).