DOI: 10.1002/2014GL062969
论文题名: Enhanced sensitivity of oceanic CO<inf>2</inf> uptake to dust deposition by iron-light colimitation
作者: Nickelsen L. ; Oschlies A.
刊名: Geophysical Research Letters
ISSN: 0094-9038
EISSN: 1944-8769
出版年: 2015
卷: 42, 期: 2 起始页码: 492
结束页码: 499
语种: 英语
英文关键词: dust deposition
; glacial-interglacial cycles
; iron-light colimitation
; Last Glacial Maximum
; photosynthesis
; Southern Ocean
Scopus关键词: Biochemistry
; Carbon dioxide
; Deposition
; Dust
; Electron transport properties
; Glacial geology
; Nutrients
; Photosynthesis
; Phytoplankton
; Co-limitation
; Dust deposition
; Glacial-interglacial cycles
; Last Glacial Maximum
; Southern ocean
; Iron
; bioavailability
; carbon dioxide
; iron
; light effect
; nutrient uptake
; open ocean
; phytoplankton
; trace element
英文摘要: The iron hypothesis suggests that in large areas of the ocean phytoplankton growth and thus photosynthetic CO2 uptake is limited by the micronutrient iron. Phytoplankton requires iron in particular for nitrate uptake, light harvesting, and electron transport in photosynthesis, suggesting a tight coupling of iron and light limitation. One important source of iron to the open ocean is dust deposition. Previous global biogeochemical modeling studies have suggested a low sensitivity of oceanic CO2 uptake to changes in dust deposition. Here we show that this sensitivity is increased significantly when iron-light colimitation, i.e., the impact of iron bioavailability on light-harvesting capabilities, is explicitly considered. Accounting for iron-light colimitation increases the shift of export production from tropical and subtropical regions to the higher latitudes of subpolar regions at high dust deposition and amplifies iron limitation at low dust deposition. Our results reemphasize the role of iron as a key limiting nutrient for phytoplankton. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923376004&doi=10.1002%2f2014GL062969&partnerID=40&md5=b859214ce5dae303f04f4b8af495be03
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8654
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Recommended Citation:
Nickelsen L.,Oschlies A.. Enhanced sensitivity of oceanic CO<inf>2</inf> uptake to dust deposition by iron-light colimitation[J]. Geophysical Research Letters,2015-01-01,42(2).