搜索结果: 1-15 共查到“海洋地质学 oxygen”相关记录15条 . 查询时间(0.17 秒)
Smothered oceans: Extreme oxygen loss in oceans accompanied past global climate change
Smothered oceans Extreme oxygen loss oceans accompanied past global climate change
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2015/3/4
Seafloor sediment cores reveal abrupt, extensive loss of oxygen in the ocean when ice sheets melted roughly 10,000-17,000 years ago, according to a study from the University of California, Davis. The ...
Mineralization pathways in lake sediments with different oxygen and organic carbon supply
Mineralization pathways lake sediments different oxygen organic carbon supply
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2014/4/17
The intensity and pathways of mineralization of sedimentary organic matter were investigated in eutrophic Lake Zug, Switzerland. In a depth transect (25–180 m) from oxic to anoxic bottom water we reco...
Organic carbon burial efficiency in lake sediments controlled by oxygen exposure time and sediment source
Organic carbon burial efficiency lake sediments controlled oxygen exposure time sediment source
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2014/4/17
We compared the burial efficiency of organic carbon (buried OC : depositedOC) in a diverse set of 27 different sediments from 11 lakes, focusing on the potential effects of organic matter source, oxyg...
Simultaneous measurements of nitrate, oxygen, and carbon dioxide on oceanographic moorings: Observing the Redfield ratio in real time
nitrate oxygen carbon dioxide
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2014/4/16
Autonomous observations of dissolved nitrate, oxygen, and total inorganic carbon (TCO2
, which is derived
from pCO2
and estimates of alkalinity) from sensors on the M1 and M2 moorings, off Monterey...
Intermittent oxygen flux from the interior into the bottom boundary of lakes as observed by eddy correlation
Intermittent oxygen flux observed
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2014/4/21
Turbulent oxygen transport from the overlying stratified water column into the bottom boundary layer (BBL)
on the slope of a medium-sized lake was investigated using the eddy correlation (EC) techniq...
Oxygen depletion in lake hypolimnia
Oxygen depletion lake hypolimnia
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2014/4/18
The Livingstone and Imboden (1996) model for the oxygen depletion rate in lake hypolimnia was evaluated
with field results in 32 lakes. The volumetric oxygen consumption rate (JV) was strongly relate...
Dissolved oxygen transfer to sediments by sweep and eject motions in aquatic environments
Dissolved oxygen transfer sediments sweep eject motions aquatic environments
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2014/4/21
Dissolved oxygen (DO) concentrations were quantified near the sediment–water interface to evaluate DO transfer to sediments in a laboratory recirculating flume and open channel under varying fluid-flo...
Nitrogen and oxygen isotopic signatures of subsurface nitrate seaward of the Florida Keys reef tract
Nitrogen oxygen isotopic signatures subsurface nitrate seaward Florida Keys reef tract
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2014/4/22
Hydrographic and nutrient structure and the nitrogen and oxygen isotopic compositions (d15N and d18O) of the nitrate pool seaward of the Florida Keys reef tract were measured in Summer 2003. Nitrate a...
A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California
oxygen isotopic composition dissolved inorganic phosphate Monterey Bay California
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2014/5/5
We present a 2-yr time series of the oxygen isotopic composition of dissolved inorganic phosphate (δ18Op) in Monterey Bay, California. δ18Op can serve as a proxy for phosphate utilization because its ...
Seasonal variations in triple oxygen isotopes and gross oxygen production in the Sagami Bay, central Japan
Seasonal variations triple oxygen isotopes gross oxygen production Sagami Bay central Japan
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2014/5/9
We studied daily, diurnal, and seasonal variations in triple oxygen isotopes in the Sagami Bay from May to October 2002. The variations in composition of triple oxygen isotopes are in association with...
Effect of the brittle star Amphiura filiformis (Amphiuridae, Echinodermata) on oxygen flux into the sediment
brittle star Amphiura filiformis oxygen flux sediment
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2014/5/21
O2 plays a key role in early sedimentary diagenetic processes, but the effect of most macrofaunal species on the pathways and rates of supply of O2 into the seabed are not well known. We investigated ...
Oxygen transfer across the air-water interface by natural convection in lakes
Oxygen transfer air-water interface natural convection lakes
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2014/5/26
Oxygen transfer associated with natural convection in lakes and reservoirs was examined in a series of laboratory experiments. A thin, cool surface water layer (2-3 mm in thickness) was formed by chil...
Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret
community respiratory mechanisms oxygen isotopes Lake Kinneret
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2014/5/26
Gross and net O2 production between May 1996 and February 1999 was determined in bottle incubation experiments with H218O spike and from the change in O2 concentration. Carbon fixation rates were obta...
Small-scale oxygen fluxes and remineralization in sinking aggregates
Small-scale oxygen fluxes remineralization sinking aggregates
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2014/6/10
Sinking aggregates are the major component of the vertical particulate flux in most regions of the ocean. Controlling factors for aggregate remineralization rates and solute exchange with the surround...
Role of the oxygen-deficient zone in transfer of organic carbon to the deep ocean
the oxygen-deficientzone in transfer organic carbon the deep ocean
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2014/6/10
Benthic carbon oxidation rates and carbon burial rates have been determined for two contrasting continental margins and their sum has been used as an estimate of carbon rain rate to the sediments. On ...