Now showing items 51-60 of 861
Comment on “Modern-age buildup of CO2 and its effects on seawater acidity and salinity” by Hugo A. Loáiciga
(American Geophysical Union, 2007-09-25)
Globally elevated titanium, tantalum, and niobium (TITAN) in ocean island basalts with high 3He/4He
(American Geophysical Union, 2008-04-17)
We report evidence for a global Ti, Ta, and Nb (TITAN) enriched reservoir sampled by ocean island basalts (OIBs) with high 3He/4He ratios, an isotopic signature associated with the deep mantle. Excesses of Ti (and to a ...
An estimate of the global distribution of radon emissions from the ocean
(American Geophysical Union, 2004-10-07)
There is a need for improved estimates of the radon (222Rn) flux density from the ocean for use in the modeling and interpretation of atmospheric radon in global climate and air pollution studies. We use a modification of ...
Land2Sea database of river drainage basin sizes, annual water discharges, and suspended sediment fluxes
(American Geophysical Union, 2009-06-20)
The Land2Sea database contains data on the sizes of 1519 exorheic river drainage basins (79% of the exorheic land area), annual suspended sediment fluxes (593 rivers, 63% of the exorheic land area), and water discharges ...
An interlaboratory study of TEX86 and BIT analysis using high-performance liquid chromatography–mass spectrometry
(American Geophysical Union, 2009-03-20)
Recently, two new proxies based on the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) were proposed, i.e., the TEX86 proxy for sea surface temperature reconstructions and the BIT index for reconstructing ...
A new automated method for measuring noble gases and their isotopic ratios in water samples
(American Geophysical Union, 2009-05-29)
A method is presented for precisely measuring all five noble gases and their isotopic ratios in water samples using multiple programmed multistage cryogenic traps in conjunction with quadrupole mass spectrometry and magnetic ...
Light-driven cycling of dimethylsulfide (DMS) in the Sargasso Sea : closing the loop
(American Geophysical Union, 2004-05-06)
The factors driving dimethylsulfide (DMS) cycling in oligotrophic environments are isolated using a time-series of DMS sampled in the Sargasso Sea. The observed distribution of DMS is inconsistent with bottom-up processes ...
Origins of archaeal tetraether lipids in sediments : insights from radiocarbon analysis
Understanding the supply and preservation of glycerol dibiphytanyl glycerol tetraethers (GDGTs) in marine sediments helps inform their use in paleoceanography. Compound-specific radiocarbon measurements of sedimentary ...
Sulfur isotope measurement of sulfate and sulfide by high-resolution MC-ICP-MS
We have developed a technique for the accurate and precise determination of 34S/32S isotope ratios (δ34S) in sulfur-bearing minerals using solution and laser ablation multiple-collector inductively coupled plasma mass ...
A radiocarbon-based assessment of the preservation characteristics of crenarchaeol and alkenones from continental margin sediments
Crenarchaeotal glycerol dibiphytanyl glycerol tetraether (GDGT) lipids and alkenones are two types of biomarkers derived from planktonic marine micro-organisms which are used for reconstruction of sea-surface temperatures. ...