Skip to main content

Abyssal Ocean Warming and Salinification after Weddell Polynyas in the GFDL CM2G Coupled Climate Model

Author(s): Zanowski, Hannah; Hallberg, Robert; Sarmiento, Jorge L

To refer to this page use:
Abstract: The role of Weddell Sea polynyas in establishing deep-ocean properties is explored in the NOAA Geophysical Fluid Dynamics Laboratory’s (GFDL) coupled climate model CM2G. Using statistical composite analysis of over 30 polynya events that occur in a 2000-yr-long preindustrial control run, the temperature, salinity, and water mass changes associated with the composite event are quantified. For the time period following the composite polynya cessation, termed the “recovery,” warming between 0.002° and 0.019°C decade−1 occurs below 4200 m in the Southern Ocean basins. Temperature and salinity changes are strongest in the Southern Ocean and the South Atlantic near the polynya formation region. Comparison of the model results with abyssal temperature observations reveals that the 1970s Weddell Polynya recovery could account for 10% ± 8% of the recent warming in the abyssal Southern Ocean. For individual Southern Ocean basins, this percentage is as little as 6% ± 11% or as much as 34% ± 13%.
Publication Date: 11-Nov-2015
Citation: Zanowski, Hannah, Robert Hallberg, and Jorge L. Sarmiento. "Abyssal ocean warming and salinification after Weddell polynyas in the GFDL CM2G coupled climate model." Journal of Physical Oceanography 45, no. 11 (2015): 2755-2772. doi:10.1175/JPO-D-15-0109.1.
DOI: doi:10.1175/JPO-D-15-0109.1
ISSN: 0022-3670
EISSN: 1520-0485
Pages: 2755 - 2772
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Physical Oceanography
Version: Final published version. This is an open access article.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.