Effects of African dust deposition on phytoplankton in the western tropical Atlantic Ocean off Barbados

被引:94
作者
Chien, Chia-Te [1 ]
Mackey, Katherine R. M. [2 ]
Dutkiewicz, Stephanie [3 ]
Mahowald, Natalie M. [4 ]
Prospero, Joseph M. [5 ]
Paytan, Adina [1 ]
机构
[1] Univ Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA USA
[2] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA
[3] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA
[4] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY USA
[5] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA
基金
美国国家科学基金会;
关键词
SUBTROPICAL NORTH-ATLANTIC; PHOSPHATE ACQUISITION GENES; BIOMASS BURNING EMISSIONS; MEANDERING GUIANA CURRENT; LOW-CHLOROPHYLL ECOSYSTEM; SARGASSO SEA; NITROGEN-FIXATION; ATMOSPHERIC DEPOSITION; MEDITERRANEAN SEA; PHOSPHORUS LIMITATION;
D O I
10.1002/2015GB005334
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Bioassay incubation experiments conducted with nutrients and local atmospheric aerosol amendments indicate that phosphorus (P) availability limited phytoplankton growth in the low-nutrient low-chlorophyll (LNLC) ocean off Barbados. Atmospheric deposition provides a relatively large influx of new nutrients and trace metals to the surface ocean in this region in comparison to other nutrient sources. However, the impact on native phytoplankton is muted due to the high ratio of nitrogen (N) to P (NO3:SRP>40) and the low P solubility of these aerosols. Atmospheric deposition induces P limitation in this LNLC region by adding more N and iron (Fe) relative to P. This favors the growth of Prochlorococcus, a genus characterized by low P requirements and highly efficient P acquisition mechanisms. A global three-dimensional marine ecosystem model that includes species-specific phytoplankton elemental quotas/stoichiometry and the atmospheric deposition of N, P, and Fe supports this conclusion. Future increases in aerosol N loading may therefore influence phytoplankton community structure in other LNLC areas, thereby affecting the biological pump and associated carbon sequestration.
引用
收藏
页码:716 / 734
页数:19
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