DOI: 10.1029/2019GB006214
论文题名: Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid-ocean Ridges
作者: Tuerena R.E. ; Williams R.G. ; Mahaffey C. ; Vic C. ; Green J.A.M. ; Naveira-Garabato A. ; Forryan A. ; Sharples J.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 8 语种: 英语
英文关键词: chlorophyll
; energy dissipation
; gyre
; internal tide
; mixing
; nitrate
; nutrient cycling
; subtropical region
; thermocline
; tidal cycle
; Atlantic Ocean
; Atlantic Ocean (North)
; Mid-Atlantic Ridge
学科: Atlantic
; gyre
; mixing
; nitrate
; nutrients
; tides
中文摘要: Diapycnal mixing of nutrients from the thermocline to the surface sunlit ocean is thought to be relatively weak in the world's subtropical gyres as energy inputs from winds are generally low. The interaction of internal tides with rough topography enhances diapycnal mixing, yet the role of tidally induced diapycnal mixing in sustaining nutrient supply to the surface subtropical ocean remains relatively unexplored. During a field campaign in the North Atlantic subtropical gyre, we tested whether tidal interactions with topography enhance diapycnal nitrate fluxes in the upper ocean. We measured an order of magnitude increase in diapycnal nitrate fluxes to the deep chlorophyll maximum (DCM) over the Mid-Atlantic Ridge compared to the adjacent deep ocean. Internal tides drive this enhancement, with diapycnal nitrate supply to the DCM increasing by a factor of 8 between neap and spring tides. Using a global tidal dissipation database, we find that this spring-neap enhancement in diapycnal nitrate fluxes is widespread over ridges and seamounts. Mid-ocean ridges therefore play an important role in sustaining the nutrient supply to the DCM, and these findings may have important implications in a warming global ocean. © 2019. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160114
Appears in Collections: 气候变化与战略
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作者单位: School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; School of Ocean and Earth Sciences, University of Southampton, Southampton, United Kingdom; School of Ocean Sciences, Bangor University, Bangor, United Kingdom
Recommended Citation:
Tuerena R.E.,Williams R.G.,Mahaffey C.,et al. Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid-ocean Ridges[J]. Global Biogeochemical Cycles,2019-01-01,33(8)