Chlorin accumulation rate as a proxy for Quaternary marine primary productivity

Nature ◽  
1996 ◽  
Vol 383 (6595) ◽  
pp. 63-65 ◽  
Author(s):  
P. G. Harris ◽  
M. Zhao ◽  
A. Rosell-Melé ◽  
R. Tiedemann ◽  
M. Sarnthein ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Accumulation Rate ◽  
Marine Primary Productivity

LATE PALEOZOIC IRON FERTILIZATION FROM DUST ENHANCED SHALLOW MARINE PRIMARY PRODUCTIVITY

2019 ◽  
Author(s):  
Mehrdad Sardar Abadi ◽  
◽  
Jeremy D. Owens ◽  
Xiaolei Liu ◽  
Theodore R. Them ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Late Paleozoic ◽  
Shallow Marine ◽  
Iron Fertilization ◽  
Marine Primary Productivity

scholarly journals A new design of measuring marine primary productivity to support eco-geological survey

China Geology ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 112-113 ◽  
Author(s):  
Shao-feng Pei ◽  
◽  
Ya-xuan Zhu ◽  
Si-yuan Ye ◽  
Hong-ming Yuan ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Geological Survey ◽  
Marine Primary Productivity

scholarly journals Sedimentary changes on the Southeastern Brazilian upper slope during the last 35,000 years

2007 ◽  
Vol 79 (1) ◽  
pp. 171-181 ◽  
Author(s):  
Michel M. Mahiques ◽  
Marina M. Fukumoto ◽  
Ilson C.A. Silveira ◽  
Rubens C.L. Figueira ◽  
Marcia C. Bícego ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Primary Productivity ◽  
Accumulation Rate ◽  
Climatic Conditions ◽  
Southeastern Brazil ◽  
Sedimentation Rates ◽  
Sedimentary Characteristics ◽  
Brazil Current ◽  
Sedimentary Core ◽  
Upper Slope

A first evaluation of the sedimentary changes, including accumulation of inorganic and organic carbon on the upper slope off Southeastern Brazil under different climatic conditions, based on the analysis of a sedimentary core, is here presented. Results indicate that sedimentation rate as well sedimentary characteristics, including the nature of the organic carbon deposited during the LGM (Last Glacial Maximum), were different from the present deposition, indicating higher primary productivity during the LGM, to be accounted for by the higher values of marine organic carbon. Nevertheless, the higher values of Accumulation Rate of calcium carbonate and organic carbon can be credited to the higher values of the sedimentation rates. Conditions prevailing during Isotope Stage 3 may be considered intermediate as between the LGM and the present day. The conditions for a higher primary productivity associated with the deposition of finer terrigenous sediments may be explained as a response to the off shoreward displacement of the main flow of the Brazil Current.

2000 years of marine primary productivity in the Eastern Tropical North Pacific

2020 ◽  
Author(s):  
Christina Treinen-Crespo ◽  
Jose Carriquiry ◽  
Julio Villaescusa ◽  
Elisabet Repiso-Terrones
Keyword(s):  
High Resolution ◽  
Climate Variability ◽  
Primary Productivity ◽  
North Pacific ◽  
Biogenic Silica ◽  
Change Scenario ◽  
The Past ◽  
Past 2000 Years ◽  
Increasing Trend ◽  
Marine Primary Productivity

<p>Changes in marine primary productivity (MPP) over the 21st century are expected to occur under the prevailing climate change scenario. For better understanding of past climate variability, we reconstructed MPP at high resolution (~1-2 years) for the past 2000 years analyzing biogenic silica and total organic carbon (TOC %) on a sediment core collected from Soledad Basin (25°N, 112°W), Baja  California, Mexico. Located in the Eastern Tropical North Pacific, this suboxic basin is ideal for palaeoceanographic reconstructions due to its high sedimentation rate (2 mm/year), which allow us to reconstruct past changes in the ocean and climate at high resolution. Our results show an increasing trend in the variability of MPP for the past 2000 years: biogenic silica content does not show a well-defined trend, but rather it is dominated by strong multidecadal and prominent centennial-scale cycles while TOC (%) shows a slight increasing trend towards the present, starting at least 2000 years ago. Spectral analysis confirms the presence of multidecadal to centennial cycles. These results will be discussed in the context of the Anthropocene and natural climate variability.</p>

Seasonal Periodicity of Diatoms, and Silicon Limitation in Offshore Lake Michigan, 1975

1977 ◽  
Vol 34 (4) ◽  
pp. 552-558 ◽  
Author(s):  
J. I. Parker ◽  
H. L. Conway ◽  
E. M. Yaguchi
Keyword(s):  
Key Words ◽  
Primary Productivity ◽  
Rapid Growth ◽  
Lake Michigan ◽  
Spring Bloom ◽  
Accumulation Rate ◽  
Biomass Accumulation ◽  
Seasonal Periodicity ◽  
Silicon Uptake ◽  
Bloom Diatom

Diatom biomass maxima occurred in spring and fall and produced a bimodal bloom sequence at an offshore Lake Michigan station. The maximum in May was preceded by rapid growth as indicated by increased values of primary productivity and pigment concentration. As the spring bloom progressed, decreasing nutrient levels apparently slowed diatom growth. The diatom-biomass accumulation rate declined, assimilation quotients were minimal, and soluble reactive silicon was reduced from 13 to 6.8 μmol/ℓ. In summer, after the bloom, diatom biomass and silicon reached seasonal minima of < 250 mg C/m2 and ~ 1.0 μmol/ℓ, respectively. Diatom biomass increased again in October when silicon supplies were replenished and the concentration exceeded 6.6 μmol/ℓ. A critical silicon concentration of ~ 6.5 μmol/ℓ, may control the development and timing of offshore diatom populations in Lake Michigan. Key words: Lake Michigan, diatoms, growth, biomass, periodicity, silicon, uptake, limitation

scholarly journals Possible patterns of marine primary productivity during the Great Ordovician Biodiversification Event

Lethaia ◽  
2017 ◽  
Vol 51 (2) ◽  
pp. 187-197 ◽  
Author(s):  
Alexandre Pohl ◽  
David A. T. Harper ◽  
Yannick Donnadieu ◽  
Guillaume Le Hir ◽  
Elise Nardin ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Marine Primary Productivity
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