Resolving Eustasy from Neotectonics in the Sea-Level History of the Pliocene to Holocene of Qatar

2014 ◽  
Author(s):  
Jeremy Jameson ◽  
Christian J. Strohmenger
Keyword(s):  
Sea Level ◽  
History Of

Phanerozoic Oxygen

2017 ◽  
Author(s):  
Donald Eugene Canfield
Keyword(s):  
Oxygen Consumption ◽  
Organic Carbon ◽  
Sea Level ◽  
Time Scale ◽  
Atmospheric Oxygen ◽  
Sea Level Change ◽  
Oxygen Production ◽  
Level Change ◽  
History Of ◽  
Geologic Processes

This chapter discusses the modeling of the history of atmospheric oxygen. The most recently deposited sediments will also be the most prone to weathering through processes like sea-level change or uplift of the land. Thus, through rapid recycling, high rates of oxygen production through the burial of organic-rich sediments will quickly lead to high rates of oxygen consumption through the exposure of these organic-rich sediments to weathering. From a modeling perspective, rapid recycling helps to dampen oxygen changes. This is important because the fluxes of oxygen through the atmosphere during organic carbon and pyrite burial, and by weathering, are huge compared to the relatively small amounts of oxygen in the atmosphere. Thus, all of the oxygen in the present atmosphere is cycled through geologic processes of oxygen liberation (organic carbon and pyrite burial) and consumption (weathering) on a time scale of about 2 to 3 million years.

Reconstructing a 350ky history of sea level using planktonic Mg/Ca and oxygen isotope records from a Cocos Ridge core

2002 ◽  
Vol 21 (1-3) ◽  
pp. 283-293 ◽  
Author(s):  
David W. Lea ◽  
Pamela A. Martin ◽  
Dorothy K. Pak ◽  
Howard J. Spero
Keyword(s):  
Oxygen Isotope ◽  
Sea Level ◽  
History Of

Miocene sea-level falls related to the geologic history of Midway Atoll

Geology ◽  
1987 ◽  
Vol 15 (5) ◽  
pp. 454 ◽  
Author(s):  
J. M. Lincoln ◽  
S. O. Schlanger
Keyword(s):  
Sea Level ◽  
Geologic History ◽  
History Of

Exercise-induced VA/Q inequality in subjects with prior high-altitude pulmonary edema

1996 ◽  
Vol 81 (2) ◽  
pp. 922-932 ◽  
Author(s):  
A. Podolsky ◽  
M. W. Eldridge ◽  
R. S. Richardson ◽  
D. R. Knight ◽  
E. C. Johnson ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Pulmonary Edema ◽  
High Altitude ◽  
Sea Level ◽  
Control Group ◽  
Pulmonary Capillary ◽  
High Altitude Pulmonary Edema ◽  
History Of ◽  
Capillary Pressures ◽  
Exercise Induced

Ventilation-perfusion (VA/Q) mismatch has been shown to increase during exercise, especially in hypoxia. A possible explanation is subclinical interstitial edema due to high pulmonary capillary pressures. We hypothesized that this may be pathogenetically similar to high-altitude pulmonary edema (HAPE) so that HAPE-susceptible people with higher vascular pressures would develop more exercise-induced VA/Q mismatch. To examine this, seven healthy people with a history of HAPE and nine with similar altitude exposure but no HAPE history (control) were studied at rest and during exercise at 35, 65, and 85% of maximum 1) at sea level and then 2) after 2 days at altitude (3,810 m) breathing both normoxic (inspired Po2 = 148 Torr) and hypoxic (inspired Po2 = 91 Torr) gas at both locations. We measured cardiac output and respiratory and inert gas exchange. In both groups, VA/Q mismatch (assessed by log standard deviation of the perfusion distribution) increased with exercise. At sea level, log standard deviation of the perfusion distribution was slightly higher in the HAPE-susceptible group than in the control group during heavy exercise. At altitude, these differences disappeared. Because a history of HAPE was associated with greater exercise-induced VA/Q mismatch and higher pulmonary capillary pressures, our findings are consistent with the hypothesis that exercise-induced mismatch is due to a temporary extravascular fluid accumulation.

scholarly journals New relative sea-level insights into the isostatic history of the Western Mediterranean

2018 ◽  
Vol 201 ◽  
pp. 396-408 ◽  
Author(s):  
Matteo Vacchi ◽  
Matthieu Ghilardi ◽  
Rita T. Melis ◽  
Giorgio Spada ◽  
Matthieu Giaime ◽  
...  
Keyword(s):  
Sea Level ◽  
Western Mediterranean ◽  
Relative Sea Level ◽  
History Of
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