Effects of Large-Scale Ocean Dynamics on Climate System Response to External Forcing

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Physical Oceanography".

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 121

Special Issue Editors


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Guest Editor
Arctic and Antarctic Research Institute, Saint Petersburg, Russia
Interests: climate change and variability modeling; ocean and atmospheric dynamics; dynamical systems; artificial intelligence; sensitivity analysis; adaptive and optimal control
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Guest Editor
Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
Interests: geophysical fluid dynamics; test cases for global scale GCMs; extension of the geostrophic adjustment problem to continuous initial fields; wind-driven circulation in the ocean for general wind stress; a Lagrangian perspective of net evaporation (evaporation minus precipitation); circulation in semi-enclosed basins and estuaries

Special Issue Information

Dear Colleagues,

Climate change is one of the current global challenges affecting the vital interests and fate of all mankind and requiring the consolidated efforts of all the states of the world for solutions. Unlike all previous climate changes, its current change has two characteristic features. First, the rate of climate change is unprecedented. Secondly, current climate change is "human-made" since its main cause is human activities. Unlike the atmosphere, the ocean, one of the five major components of the Earth’s climate system, has a large heat capacity and thermal inertia. At the same time, in contrast to the cryosphere and lithosphere, the ocean is a fairly mobile geophysical medium with pronounced dynamic properties. The ocean is also a store of thermal energy and a sink for excess carbon dioxide. All this suggests that the ocean plays a great role in shaping the climate and has a significant impact on the character of current climate change and its variability.

Understanding how large-scale ocean dynamics affect climate in response to external forcings, both natural and anthropogenic, is essential to form a more or less complete and clear picture of how climate will change in the future, depending on the nature of human economic activity and, in the long prospective, depending on astronomical factors. Even though in recent decades, due to the increased power of supercomputers and the development of highly complex Earth system models, a large number of studies have been carried out related to the assessment of the ocean’s role in shaping the climate and its changes, plenty of unresolved and controversial problems still remain that require further consideration. Such problems include, for example, assessing the global warming impact on the large-scale ocean dynamics, estimating the effects of radiative feedback and ocean thermal inertia uncertainties on interannual, decadal and multidecadal climate variability, studying the role of sea surface temperature in the tropics in shaping the climate of middle and high latitudes, in particular the arctic amplification, etc.

This Special Issue showcases research related to assessing the impact of large-scale ocean dynamics on the climate system response to both natural and human-made external forcings and, vice versa, estimating the effects of global warming on the ocean’s dynamical features. Studies discussing the results of numerical experiments with climate models of various complexities are also welcome. We invite you to publish articles related to the analysis of observational data on the state of the ocean and the use of new methods for processing these data, including artificial intelligence technologies.

We look forward to receiving manuscripts in consideration of all of the above.

Dr. Sergei Soldatenko
Prof. Dr. Nathan Paldor
Guest Editors

Manuscript Submission Information

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Keywords

  • climate change and variability
  • ocean dynamics
  • climate system response
  • numerical climate modeling: climate feedback
  • climate sensitivity

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Published Papers (1 paper)

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Research

10 pages, 2047 KiB  
Article
Weakening of the Geostrophic Component of the Gulf Stream: A Positive Feedback Loop on the Melting of the Arctic Ice Sheet
by Jean-Louis Pinault
J. Mar. Sci. Eng. 2023, 11(9), 1689; https://doi.org/10.3390/jmse11091689 - 27 Aug 2023
Cited by 1 | Viewed by 1349
Abstract
The North Atlantic gyre experiences both a significant temperature rise at high latitudes and a considerable weakening of the geostrophic component of the Gulf Stream, which is reflected by the 64-year fundamental gyral Rossby wave (GRW). This singular behavior compared to the South [...] Read more.
The North Atlantic gyre experiences both a significant temperature rise at high latitudes and a considerable weakening of the geostrophic component of the Gulf Stream, which is reflected by the 64-year fundamental gyral Rossby wave (GRW). This singular behavior compared to the South Atlantic and South Indian Ocean gyres highlights a feedback loop of Arctic ice sheet melting on mid-latitude Atlantic Ocean temperature. The warming of the northern oceanic gyre at high latitudes due to the retreat of Arctic ice sheet via the Labrador Current decreases the thermal gradient between the high and low latitudes of the north Atlantic gyre. This results in a weakening of the geostrophic forces at the basin scale and a reduction in the amplitude of the GRWs. Reducing the amplitude of the variation of the upward and downward movement of the pycnocline modifies air–sea interactions, weakening vertical mixing as well as the evaporation processes and the departure of latent heat when the pycnocline rises. The resulting thermal anomaly stretching along the Gulf Stream from where it leaves the American continent is partly transferred to the Arctic sea ice via the drift current and thermohaline circulation, which contributes to the retreat of the ice sheet, and the closing of the feedback loop. The 64-year-period GRW should disappear around 2050 if its damping continues linearly, favoring an increasingly rapid warming of the ocean at mid-latitudes. These interactions are less acute in the southern hemisphere due to the circumpolar current. Full article
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