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Intrinsic oceanic decadal variability of upper-ocean heat content

Abstract.

"Atmosphere and ocean are coupled via air–sea interactions. The atmospheric conditions fuel the ocean circulation and its variability, but the extent to which ocean processes can affect the atmosphere at decadal time scales remains unclear. In particular, such low-frequency variability is difficult to extract from the short observational record, meaning that climate models are the primary tools deployed to resolve this question. Here, we assess how the ocean’s intrinsic variability leads to patterns of upper-ocean heat content [...]"

 

Source: AMS- American Meteorological Society
Authors: Navid C. Constantinou et al.
DOI: https://doi.org/10.1175/JCLI-D-20-0962.1

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Current Atlantic Meridional Overturning Circulation weakest in last millennium

Abstract.

"The Atlantic Meridional Overturning Circulation (AMOC)—one of Earth’s major ocean circulation systems—redistributes heat on our planet and has a major impact on climate. Here, we compare a variety of published proxy records to reconstruct the evolution of the AMOC since about AD 400. A fairly consistent picture of the AMOC emerges: after a long and relatively stable period, there was an initial weakening starting in the nineteenth century, followed by a second, more rapid, decline in the mid-twentieth[...]"

 

Source: Nature Geosciences
Authors: L. Caesar et al.
DOI: https://doi.org/10.1038/s41561-021-00699-z

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Source partitioning of oxygen-consuming organic matter in the hypoxic zone of the Chesapeake Bay

Abstract.

"We surveyed the carbonate system along the main channel of the Chesapeake Bay in June 2016 to elucidate carbonate dynamics and the associated sources of oxygen‐consuming organic matter. Using a two endmember mixing calculation, chemical proxies, and stoichiometry, we demonstrated that in early summer, dissolved inorganic carbon (DIC) dynamics were controlled by aerobic respiration in the water column (43%), sulfate reduction in the sediment (39%), atmospheric CO2 invasion (13%), and CaCO3 dissolution (5%). A mass balance of the DIC concentration and its stable isotope suggested that the apparent δ13C of oxygen‐consuming[...]"

 

Source: Association for the Sciences of Limnology and Oceanography
Authors: Jianzhong Su et al.
DOI: https://doi.org/10.1002/lno.11419

Read the full article here.


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