Mass, heat, oxygen and nutrient fluxes at 30°S and their implications for the Pacific-Indian through flow and the global heat budget
Macdonald, Alison M.
MetadataShow full item record
LocationSouth Pacific Ocean
South Indian Ocean
Six hydrographic basinwide sections, two in each of the three major ocean basins, are employed in a set of inverse calculations to determine the extent of exchange between the Pacific and Indian Oceans through the Indonesian Archipelago and the net global oceanic heat flux at 30°S. Using a model which combines the data for the South Pacific and South Indian Oceans, it is found that even the largest existing estimates of Indonesian Passage through flow (20 Sv) are consistent with the data. However, the available information cannot limit the extent of the exchange, i.e. both smaller and larger through flows produce physically reasonable circulation patterns. The seasonal and interannual variations which have been found by other investigators and which we are incapable of resolving, lead us to conclude that in the long term mean an estimate of ~10 Sv for the through flow is most reasonable. Globally, at 30°S, we find a net oceanic heat flux of -1.1 ± 1.7 PW, which is not significantly different from zero. It is dominated by a large (>1 PW) southward heat flux in the Indian Ocean. Large equatorward (~0.8 PW) heat flux values in the South Atlantic Basin are not consistent with our data. We therefore conclude that although our data are consistent with some water following the warm water return path for NADW (Gordon 1986), the cold water path must play the dominant role in the maintenance of the global thermohaline cell associated with the formation process of NADW.
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution July 1991
Showing items related by title, author, creator and subject.
Understanding the ocean carbon and sulfur cycles in the context of a variable ocean : a study of anthropogenic carbon storage and dimethylsulfide production in the Atlantic Ocean Levine, Naomi M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)Anthropogenic activity is rapidly changing the global climate through the emission of carbon dioxide. Ocean carbon and sulfur cycles have the potential to impact global climate directly and through feedback loops. Numerical ...
Silverthorne, Katherine E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)Observational and modeling techniques are employed to investigate the thermal and inertial upper ocean response to wind and buoyancy forcing in the North Atlantic Ocean. First, the seasonal kinetic energy variability of ...
A study of ocean wave statistical properties using nonlinear, directional, phase-resolved ocean wave-field simulations Henry, Legena Albertha (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)In the present work, we study the statistics of wavefields obtained from non-linear phase-resolved simulations. The numerical model used to generate the waves models wave-wave interactions based on the fully non-linear ...