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Wednesday, July 22, 2020 | History

2 edition of study of North Atlantic ventilation using transient tracers found in the catalog.

study of North Atlantic ventilation using transient tracers

Scott Christopher Doney

study of North Atlantic ventilation using transient tracers

by Scott Christopher Doney

  • 253 Want to read
  • 21 Currently reading

Published by Woods Hole Oceanographic Institution in Woods Hole, Mass .
Written in English

    Subjects:
  • Ocean circulation -- North Atlantic Ocean.,
  • Tritium.,
  • Chlorofluorocarbons.

  • Edition Notes

    Statementby Scott Christopher Doney.
    SeriesWHOI -- 91-27., WHOI (Series) -- 91-27.
    ContributionsWoods Hole Oceanographic Institution.
    The Physical Object
    Pagination215 p. :
    Number of Pages215
    ID Numbers
    Open LibraryOL15174050M

      Abstract. Disrupting North Atlantic Deep Water (NADW) ventilation is a key concern in climate projections. We use (sub)centennially resolved bottom water δ 13 C records that span the interglacials of the last million years to assess the frequency of and the climatic backgrounds capable of triggering large NADW reductions. Episodes of reduced NADW in the deep Atlantic, similar in .   The study revealed significant variability in Using transient tracers, E. R. M. Pulses of rapid ventilation in the North Atlantic surface ocean during the past century.

    Data from two quasi-synoptics surveys of the interior of the North Atlantic, the Geochemical Ocean Sections Study (GEOSECS) and complementary oceanographic observation projects in , and the Transient Tracers in the Oceans (TTO) in and , are presented in comparative cross sections and maps representing conditions roughly one and two decades, respectively, after the first major tracer injections.   Thus it is an ideal tracer of ventilation and water mass formation in the North Atlantic. We can see this in the figure on the previous page, which provides a bird's eye view of tritium distribution in the North Atlantic in Picture yourself hovering somewhere over Norway, at an altitude of a .

    of the bomb •4C transient in the North Atlantic Ocean are made using coarse resolution (øx ø) and "eddy-permitting" (1/3øx 2/5 ø) tracer transport models. The former employs large horizontal diffusivities to parameterize eddy transfer. Both models employ the same air-sea exchange parameterization, with a. DESCRIPTION: Overview: Over the last decade, a growing international research effort has focused attention on the physical state of the Atlantic Meridional Overturning Circulation (AMOC), including its climatically-vital transports of heat, mass and tracers, and the causes and consequences of its variability. Begun in , the Line W program - moored and shipboard measurements of the.


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Study of North Atlantic ventilation using transient tracers by Scott Christopher Doney Download PDF EPUB FB2

A study of North Atlantic ventilation using transient tracers Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution August Cited by: 5.

A study of North Atlantic ventilation using transient tracers. (Geochemical Ocean Sections Study) and (Transient Tracers in the Ocean (TTO)). Book. Jan. A study of North Atlantic ventilation using transient tracers By Scott Christopher Doney Download PDF (12 MB)Author: Scott Christopher Doney.

The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are impacted by uncertainties in the time-varying boundary conditions and. The Transient Tracers in the Ocean (Tto) Program - the North-Atlantic Study, - the Tropical Atlantic Study, Publication Status is "Submitted" Or "In Press: LDEO Publication: Publication Type: Journal Article.

Year of Publication: Brewer PG, Sarmiento JL, Smethie WM Jr () The Transient Tracers in the Ocean (TTO) Program: The North Atlantic Study, ; the Tropical Atlantic Study, J Geophys Res – CrossRef Google Scholar.

The scientific papers here collected result from the Transient Tracers in the Ocean (TTO) program. The two parts of this major geochemical and physical oceanographie expedition took place in the North Atlantic Ocean in and in the Tropical Atlantic in on the research vessel Knorr of the Woods Hole Oceanographie Institution.

The expeditions, sponsored by the National Science. We have used the cumulative ventilation-rate distribution to reconcile disparate estimates of ventilation rates from two different tracers in a GCM study, thereby corroborating its utility.

Using a two-parameter statistical model we have bounded Φ(τ) for Subtropical Mode Water and Labrador Sea Water using North Atlantic CFC11 observations.

An adjoint sensitivity study of chlorofluorocarbons in the North Atlantic Xingwen Li1 Our focus here is on the nonequatorial North Atlantic Ocean. Transient tracers have also been used to infer equa- ventilation; the use of coupled transient tracers, such as tracer.

Hall, T.M., T.W.N. Haine, M. Holzer, D.A. LeBel, F. Terenzi, and D.W. Waugh, Ventilation rates estimated from tracers in the presence of transit-time distributions, and transient tracer budgets. in a recent GCM study. We then use CFC data to bound Φ(τ) for Subtropical Mode Water and Labrador Sea Water in the North Atlantic Ocean.

TRACERS AND MODELING J.L. Sarmiento Geophysical Fluid Dynamics Program, Princeton Univ., Princeton, N.J. The major tracer activity of the last four years was the completion in of a survey of the North and Tropical Atlantic begun in as part of the Transient Tracers in the Ocean.

[Gruber, ] made using historical data collected from the Transient Tracers in the Ocean/North Atlantic Study (TTO/NAS) and Transient Tracers in the Ocean/Tropical Atlantic Study (TTO/TAS) in – and from the South Atlantic Ventilation Experiment (SAVE) in – Our analysis, in conjunction with the analysis of.

Deep ventilation and water mass transformation processes in the North Atlantic, on decadal time scales, are illustrated by the evolving distribution patterns of anthropogenic tritium and radiocarbon.

Data from two quasisynoptic surveys of the interior of the North Atlantic, the Geochemical Ocean Sections Study (GEOSECS) and complementary oceanographic observation projects inand the.

The mean North Atlantic overturning streamfunctions averaged over years to of the control experiment at each resolution are shown in Figs. 2a–c. The T42x1 and T85x1 have qualitatively similar streamfunction distributions, with 10 to 11 Sv (Sv ≡ 10 6 m 3 s −1) of downwelling across m depth between 60° and 65°N.

The interpretation of transient tracer observations depends on dif•cult to obtain information on the evolution in time of the tracer boundary conditions and interior distributions.

Recent studies have attempted to circumvent this problem by making use of a derived quantity, age, based on the simultaneous distribution of two complementary tracers, such as tritium and its daughter, helium 3.

Thus it is an ideal tracer of ventilation and water mass formation in the North Atlantic. We can see this in the first figure above, which provides a bird’s eye view of tritium distribution in the North Atlantic in Picture yourself hovering somewhere over Norway, at.

Journal Article: The North Atlantic tritium and radiocarbon transients Title: The North Atlantic tritium and radiocarbon transients Full Record. trends in an ideal age tracer provide a direct measure of changes in ocean ventilation timescale in response to increasing CO2.

In the subpolar North Atlantic south of the Greenland-Scotland ridge system, there is a significant increase in subsurface ages as open ocean deep convection is diminished and ventilation switches to a predominance of. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole.

With tritium and helium-3 (3 He) data from the Transient Tracers in the Ocean (tto) expedition and from two other contemporaneous cruises, a synoptic picture of the ventilation and circulation of the subtropical North Atlantic is will see clear evidence of gyre circulation in the tritium-3 He age distributions on the shallower isopycnals, permitting estimates of the rates of.

1. Introduction. Transient tracers such as tritium (3 H), 3 He and chlorofluorocarbons (CFC's) can potentially give us valuable information on the time scales on which the ocean is tracers are often used to compute an “age” which, ideally, represents the time elapsed since a water parcel was last at the surface.

In this contribution, we discuss the application of tracers to studies of the spreading of dissolved contaminants in the ocean. Specifically, we focus on the determination of pathways and mean residence time of water masses using the transient tracers tritium/ 3 He and CFCs, as well as the H 2 18 O/H 2 16 O ratio of water.

The applications are.Adjoint sensitivities of CFC concentrations and CFC/CFC ratio ages in a North Atlantic general circulation model are analyzed. These sensitivities are compared with those of spiciness, T - (β/α) S, where α, β are the thermal and haline expansion coefficients, respectively.

High-sensitivity fields are candidates for providing the most powerful constraints in the corresponding.