globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005493
Scopus记录号: 2-s2.0-85020102348
论文题名:
Seasonal and spatial variabilities in northern Gulf of Alaska surface water iron concentrations driven by shelf sediment resuspension, glacial meltwater, a Yakutat eddy, and dust
作者: Crusius J; , Schroth A; W; , Resing J; A; , Cullen J; , Campbell R; W
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期:6
起始页码: 942
结束页码: 960
语种: 英语
英文关键词: Gulf of Alaska ; iron ; meltwater ; nutrient ; shelf sediments ; Yakutat eddy
Scopus关键词: complexation ; concentration (composition) ; continental shelf ; dust ; eddy ; glacier dynamics ; global change ; iron ; ligand ; meltwater ; nitrate ; numerical model ; nutrient ; phytoplankton ; resuspension ; seasonal variation ; shelf break ; shelf sediment ; spatial variation ; spatiotemporal analysis ; surface water ; Alaska ; Copper River ; Gulf of Alaska ; Pacific Ocean ; United States ; Yakutat Bay
英文摘要: Phytoplankton growth in the Gulf of Alaska (GoA) is limited by iron (Fe), yet Fe sources are poorly constrained. We examine the temporal and spatial distributions of Fe, and its sources in the GoA, based on data from three cruises carried out in 2010 from the Copper River (AK) mouth to beyond the shelf break. April data are the first to describe late winter Fe behavior before surface water nitrate depletion began. Sediment resuspension during winter and spring storms generated high “total dissolvable Fe” (TDFe) concentrations of ~1000 nmol kg−1 along the entire continental shelf, which decreased beyond the shelf break. In July, high TDFe concentrations were similar on the shelf, but more spatially variable, and driven by low-salinity glacial meltwater. Conversely, dissolved Fe (DFe) concentrations in surface waters were far lower and more seasonally consistent, ranging from ~4 nmol kg−1 in nearshore waters to ~0.6–1.5 nmol kg−1 seaward of the shelf break during April and July, despite dramatic depletion of nitrate over that period. The reasonably constant DFe concentrations are likely maintained during the year across the shelf by complexation by strong organic ligands, coupled with ample supply of labile particulate Fe. The April DFe data can be simulated using a simple numerical model that assumes a DFe flux from shelf sediments, horizontal transport by eddy diffusion, and removal by scavenging. Given how global change is altering many processes impacting the Fe cycle, additional studies are needed to examine controls on DFe in the Gulf of Alaska. ©2017. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77732
Appears in Collections:气候变化事实与影响

Files in This Item:

There are no files associated with this item.


作者单位: USGS Alaska Science Center at UW School of Oceanography, Seattle, WA, United States; Department of Geology, University of Vermont, Burlington, VT, United States; Joint Institute for the Study of the Atmosphere and the Ocean Pacific Marine Environmental Laboratory, University of Washington, Seattle, WA, United States; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Prince William Sound Science Center, Cordova, AK, United States

Recommended Citation:
Crusius J,, Schroth A,W,et al. Seasonal and spatial variabilities in northern Gulf of Alaska surface water iron concentrations driven by shelf sediment resuspension, glacial meltwater, a Yakutat eddy, and dust[J]. Global Biogeochemical Cycles,2017-01-01,31(6)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Crusius J]'s Articles
[, Schroth A]'s Articles
[W]'s Articles
百度学术
Similar articles in Baidu Scholar
[Crusius J]'s Articles
[, Schroth A]'s Articles
[W]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Crusius J]‘s Articles
[, Schroth A]‘s Articles
[W]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.