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Title: Carbon dioxide induced ocean climatic change and tracer experiment with an atmosphere-ocean general circulation model

Abstract

The principal objective of this study is to determine whether or not the penetration of a passive tracer is analogous to the penetration of a greenhouse-gas-induced heating. The Atmosphere Ocean General Circulation Model (A-O GCM) has been used to study CO2-induced climate change and the penetration of passive tracers into the world ocean. The present climate and a 2 x CO2 climate have been simulated. The passive tracers tritium, CFC-11, CFC-12 and a 'passive CO2- induced heating' are simulated. The CO2-induced active and passive warmings are larger in the subtropics and high latitudes than in the tropics. The largest difference between the active and passive CO2-induced heatings occur in the North Atlantic deep ocean, with maximum cooling about -1.5C for the active case in layer four of the ocean (1150m). There is no hemispherically asymmetric warming as that found by Manabe et al. (1990) and Stouffer et al. (1990). The convective overturning and large-scale sinking motion are responsible for the large penetration of CO2-induced warming in high latitudes. The CO2-induced circulation changes show that the North Atlantic thermohaline circulation is significantly weakened due to the penetration of CO2-induced heating. Associated with this change, the strength of North Atlantic conveyor beltmore » is reduced, which results in a large warming in the upper ocean and cooling in the deep layers. The characteristic response time ranges from 40-50 years for the active CO2-induced climate change, and 70-160 years for passive CO2-induced climate change. The physical processes controlling the geochemical tracer penetration are very similar to those for the CO2-induced heating. There is not a single tracer which penetrates into the ocean exactly like the active CO2-induced heating in terms of distribution, transport or physical process. CFC's may be the best candidate as a surrogate for the CO2-induced oceanic climate study.« less

Authors:
Publication Date:
Research Org.:
Illinois Univ., Urbana, IL (United States)
OSTI Identifier:
6762981
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Ph.D. Thesis
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CLIMATIC CHANGE; SIMULATION; HEAT TRANSFER; OCEANIC CIRCULATION; SEAS; COOLING; HEATING; ATLANTIC OCEAN; ATMOSPHERIC CIRCULATION; CARBON DIOXIDE; CHLOROFLUOROCARBONS; DISTRIBUTION; GENERAL CIRCULATION MODELS; LAYERS; MOTION; TRITIUM; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ENERGY TRANSFER; HYDROGEN ISOTOPES; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; NUCLEI; ODD-EVEN NUCLEI; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC FLUORINE COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RADIOISOTOPES; SURFACE WATERS; YEARS LIVING RADIOISOTOPES; 540310* - Environment, Aquatic- Basic Studies- (1990-)

Citation Formats

Jiang, Xingjian. Carbon dioxide induced ocean climatic change and tracer experiment with an atmosphere-ocean general circulation model. United States: N. p., 1991. Web.
Jiang, Xingjian. Carbon dioxide induced ocean climatic change and tracer experiment with an atmosphere-ocean general circulation model. United States.
Jiang, Xingjian. Tue . "Carbon dioxide induced ocean climatic change and tracer experiment with an atmosphere-ocean general circulation model". United States.
@article{osti_6762981,
title = {Carbon dioxide induced ocean climatic change and tracer experiment with an atmosphere-ocean general circulation model},
author = {Jiang, Xingjian},
abstractNote = {The principal objective of this study is to determine whether or not the penetration of a passive tracer is analogous to the penetration of a greenhouse-gas-induced heating. The Atmosphere Ocean General Circulation Model (A-O GCM) has been used to study CO2-induced climate change and the penetration of passive tracers into the world ocean. The present climate and a 2 x CO2 climate have been simulated. The passive tracers tritium, CFC-11, CFC-12 and a 'passive CO2- induced heating' are simulated. The CO2-induced active and passive warmings are larger in the subtropics and high latitudes than in the tropics. The largest difference between the active and passive CO2-induced heatings occur in the North Atlantic deep ocean, with maximum cooling about -1.5C for the active case in layer four of the ocean (1150m). There is no hemispherically asymmetric warming as that found by Manabe et al. (1990) and Stouffer et al. (1990). The convective overturning and large-scale sinking motion are responsible for the large penetration of CO2-induced warming in high latitudes. The CO2-induced circulation changes show that the North Atlantic thermohaline circulation is significantly weakened due to the penetration of CO2-induced heating. Associated with this change, the strength of North Atlantic conveyor belt is reduced, which results in a large warming in the upper ocean and cooling in the deep layers. The characteristic response time ranges from 40-50 years for the active CO2-induced climate change, and 70-160 years for passive CO2-induced climate change. The physical processes controlling the geochemical tracer penetration are very similar to those for the CO2-induced heating. There is not a single tracer which penetrates into the ocean exactly like the active CO2-induced heating in terms of distribution, transport or physical process. CFC's may be the best candidate as a surrogate for the CO2-induced oceanic climate study.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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