DOI: 10.1002/2014GB004940
Scopus记录号: 2-s2.0-85027928589
论文题名: A meta-analysis of oceanic DMS and DMSP cycling processes: Disentangling the summer paradox
作者: Galí M ; , Simõ R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 4 起始页码: 496
结束页码: 515
语种: 英语
英文关键词: dimethylsulfide
; dimethylsulfoniopropionate
; meta-analysis
; plankton
; seasonality
; solar radiation
Scopus关键词: biomass
; dimethylsulfide
; dimethylsulfoniopropionate
; meta-analysis
; metabolism
; mixed layer
; mortality
; nutrient cycling
; phytoplankton
; seasonality
; solar radiation
; succession
; sulfur cycle
; volatile substance
英文摘要: The biogenic volatile compound dimethylsulfide (DMS) is produced in the ocean mainly from the ubiquitous phytoplankton osmolyte dimethylsulfoniopropionate (DMSP). In the upper mixed layer, DMS concentration and the daily averaged solar irradiance are roughly proportional across latitudes and seasons. This translates into a seasonal mismatch between DMS and phytoplankton biomass at low latitudes, termed the "DMS summer paradox," which remains difficult to reproduce with biogeochemical models. Here we report on a global meta-analysis of DMSP and DMS cycling processes and their relationship to environmental factors. We show that DMS seasonality reflects progressive changes in a short-term dynamic equilibrium, set by the quotient between gross DMS production rates and the sum of biotic and abiotic DMS consumption rate constants. Gross DMS production is the principal driver of DMS seasonality, due to the synergistic increases toward summer in two of its underlying factors: phytoplankton DMSP content (linked to species succession) and short-term community DMSP-to-DMS conversion yields (linked to physiological stress). We also show that particulate DMSP transformations (linked to grazing-induced phytoplankton mortality) generally contribute a larger share of gross DMS production than dissolved-phase DMSP metabolism. The summer paradox is amplified by a decrease in microbial DMS consumption rate constants toward summer. However, this effect is partially compensated by a concomitant increase in abiotic DMS loss rate constants. Besides seasonality, we identify consistent covariation between key sulfur cycling variables and trophic status. These findings should improve the modeling projections of the main natural source of climatically active atmospheric sulfur. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77988
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Marine Biology and Oceanography, Institut de Ciències Del Mar (CSIC), Barcelona, Catalonia, Spain; Takuvik Joint International Laboratory, Laval University (Canada) - CNRS (France), Université Laval, Quebec, QC, Canada
Recommended Citation:
Galí M,, Simõ R. A meta-analysis of oceanic DMS and DMSP cycling processes: Disentangling the summer paradox[J]. Global Biogeochemical Cycles,2015-01-01,29(4)