2008: How long to ocean tracer and proxy equilibrium? Quat
The various time scales for distribution of tracers and proxies in the global ocean are critical to the interpretation of data from deepsea cores. To obtain some basic physical insight into their behavior, a global ocean circulation model, forced to least-square consistency with modern data, is used...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.389.7330 2023-05-15T17:30:38+02:00 2008: How long to ocean tracer and proxy equilibrium? Quat Carl Wunsch Patrick Heimbach The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.389.7330 http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.389.7330 http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf text ftciteseerx 2016-09-18T00:42:45Z The various time scales for distribution of tracers and proxies in the global ocean are critical to the interpretation of data from deepsea cores. To obtain some basic physical insight into their behavior, a global ocean circulation model, forced to least-square consistency with modern data, is used to find lower bounds for the time taken by surface-injected passive tracers to reach equilibrium. Depending upon the geographical scope of the injection, major gradients exist, laterally, between the abyssal North Atlantic and North Pacific, and vertically over much of the ocean, persisting for periods longer than 2000 years and with magnitudes bearing little or no relation to radiocarbon ages. The relative vigor of the North Atlantic convective process means that tracer events originating far from that location at the sea surface will tend to display abyssal signatures there first, possibly leading to misinterpretation of the event location. Ice volume (glacio-eustatic) corrections to deep-sea d 18 O values, involving fresh water addition or subtraction, regionally at the sea surface, cannot be assumed to be close to instantaneous in the global ocean, and must be determined quantitatively by modelling the flow and by including numerous more complex dynamical interactions. r 2008 Elsevier Ltd. All rights reserved. 1. Text North Atlantic Unknown Pacific |
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The various time scales for distribution of tracers and proxies in the global ocean are critical to the interpretation of data from deepsea cores. To obtain some basic physical insight into their behavior, a global ocean circulation model, forced to least-square consistency with modern data, is used to find lower bounds for the time taken by surface-injected passive tracers to reach equilibrium. Depending upon the geographical scope of the injection, major gradients exist, laterally, between the abyssal North Atlantic and North Pacific, and vertically over much of the ocean, persisting for periods longer than 2000 years and with magnitudes bearing little or no relation to radiocarbon ages. The relative vigor of the North Atlantic convective process means that tracer events originating far from that location at the sea surface will tend to display abyssal signatures there first, possibly leading to misinterpretation of the event location. Ice volume (glacio-eustatic) corrections to deep-sea d 18 O values, involving fresh water addition or subtraction, regionally at the sea surface, cannot be assumed to be close to instantaneous in the global ocean, and must be determined quantitatively by modelling the flow and by including numerous more complex dynamical interactions. r 2008 Elsevier Ltd. All rights reserved. 1. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Carl Wunsch Patrick Heimbach |
spellingShingle |
Carl Wunsch Patrick Heimbach 2008: How long to ocean tracer and proxy equilibrium? Quat |
author_facet |
Carl Wunsch Patrick Heimbach |
author_sort |
Carl Wunsch |
title |
2008: How long to ocean tracer and proxy equilibrium? Quat |
title_short |
2008: How long to ocean tracer and proxy equilibrium? Quat |
title_full |
2008: How long to ocean tracer and proxy equilibrium? Quat |
title_fullStr |
2008: How long to ocean tracer and proxy equilibrium? Quat |
title_full_unstemmed |
2008: How long to ocean tracer and proxy equilibrium? Quat |
title_sort |
2008: how long to ocean tracer and proxy equilibrium? quat |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.389.7330 http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf |
geographic |
Pacific |
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Pacific |
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North Atlantic |
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North Atlantic |
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http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.389.7330 http://ocean.mit.edu/~cwunsch/papersonline/final_published_tracer_timescales.pdf |
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