Source, settling and degradation of branched glycerol dialkyl glycerol tetraethers in the marine water column

2016 ◽  
Vol 191 ◽  
pp. 239-254 ◽  
Author(s):  
Masanobu Yamamoto ◽  
Akifumi Shimamoto ◽  
Tatsuo Fukuhara ◽  
Yuichiro Tanaka
Keyword(s):  
Water Column ◽  
Marine Water ◽  
Glycerol Dialkyl Glycerol Tetraethers

scholarly journals A 900-year New England temperature reconstruction from <i>in situ</i> seasonally produced branched glycerol dialkyl glycerol tetraethers (brGDGTs)

2018 ◽  
Author(s):  
Daniel R. Miller ◽  
M. Helen Habicht ◽  
Benjamin A. Keisling ◽  
Isla S. Castañeda ◽  
Raymond S. Bradley
Keyword(s):  
New England ◽  
Water Column ◽  
Lacustrine Sediments ◽  
Temperature Reconstruction ◽  
Early Spring ◽  
Pollen Record ◽  
The North ◽  
The North Atlantic Oscillation ◽  
Glycerol Dialkyl Glycerol Tetraethers

Abstract. Paleotemperature reconstructions are essential for distinguishing anthropogenic climate change from natural variability. An emerging method in paleoclimatology is the use of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in lacustrine sediments to reconstruct temperature, but their application is hindered by a limited understanding of their sources, seasonal production, and transport. We report seasonally resolved measurements of brGDGT production within the water column, in catchment soils and in a sediment sequence from a small, deep inland lake in Maine, USA. BrGDGT distributions in the water column are distinct from catchment soils but similar to the distributions in lake sediments, suggesting that (1) brGDGTs are produced within the lake and (2) this in situ production dominates the downcore sedimentary signal. Seasonally, depth-resolved measurements indicate that the dominant production of brGDGTs occurs in late fall/early spring and at intermediate depths (18–30 meters) in the water column. We apply these observations to help interpret a 900-year-long brGDGT-based temperature reconstruction and find that it shows similar trends to a pollen record from the same site and to regional and global syntheses of terrestrial temperatures over the last millennium. However, the record also shows higher-frequency variability than has previously been captured by such an archive in the Northeastern United States, potentially attributed to the North Atlantic Oscillation and volcanic/solar activity. This is the first brGDGT- based multi-centennial paleoreconstruction from this region and contributes to our understanding of the production and fate of brGDGTs in lacustrine systems.

An approach for extraction, characterization and quantitation of microplastic in natural marine snow using Raman microscopy

2017 ◽  
Vol 9 (9) ◽  
pp. 1470-1478 ◽  
Author(s):  
Shiye Zhao ◽  
Meghan Danley ◽  
J. Evan Ward ◽  
Daoji Li ◽  
Tracy J. Mincer
Keyword(s):  
Water Column ◽  
Raman Microscopy ◽  
Marine Water ◽  
Marine Snow ◽  
Particulate Carbon ◽  
Sea Floor ◽  
Predominant Form

Marine snow is a predominant form of sinking particulate carbon in the marine water column and represents a mechanism for transporting microplastics to the sea floor.

In situ production of branched glycerol dialkyl glycerol tetraethers in anoxic marine water columns

2014 ◽  
Vol 166 ◽  
pp. 1-8 ◽  
Author(s):  
Xiao-Lei Liu ◽  
Chun Zhu ◽  
Stuart G. Wakeham ◽  
Kai-Uwe Hinrichs
Keyword(s):  
Marine Water ◽  
Water Columns ◽  
In Situ Production ◽  
Glycerol Dialkyl Glycerol Tetraethers

Methylmercury production in the marine water column

Nature ◽  
1981 ◽  
Vol 290 (5803) ◽  
pp. 243-244 ◽  
Author(s):  
G. Topping ◽  
I. M. Davies
Keyword(s):  
Water Column ◽  
Marine Water ◽  
Methylmercury Production

The comparative fate of dinosterol and cholesterol in copepod feeding: Implications for a conservative molecular biomarker in the marine water column

1989 ◽  
Vol 14 (6) ◽  
pp. 635-641 ◽  
Author(s):  
H.Rodger Harvey ◽  
Sean C.M. O'Hara ◽  
Geoffrey Eglinton ◽  
Eric D.S. Corner
Keyword(s):  
Water Column ◽  
Marine Water ◽  
Molecular Biomarker

Microbial transformation of jellyfish organic matter affects the nitrogen cycle in the marine water column — A Black Sea case study

2016 ◽  
Vol 475 ◽  
pp. 19-30 ◽  
Author(s):  
Tinkara Tinta ◽  
Tjaša Kogovšek ◽  
Valentina Turk ◽  
Tamara A. Shiganova ◽  
Alexander S. Mikaelyan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Black Sea ◽  
Nitrogen Cycle ◽  
Microbial Transformation ◽  
Marine Water

scholarly journals Identifying and tracking proteins through the marine water column: Insights into the inputs and preservation mechanisms of protein in sediments

2012 ◽  
Vol 83 ◽  
pp. 324-359 ◽  
Author(s):  
Eli K. Moore ◽  
Brook L. Nunn ◽  
David R. Goodlett ◽  
H. Rodger Harvey
Keyword(s):  
Water Column ◽  
Marine Water
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