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Climate impacts on multidecadal pCO2 variability in the North Atlantic: 1948-2009.
- Source :
- Biogeosciences Discussions; 2015, Vol. 12 Issue 17, p15223-15244, 22p, 4 Graphs, 1 Map
- Publication Year :
- 2015
-
Abstract
- The North Atlantic is the most intense region of ocean CO<subscript>2</subscript> uptake. Here, we investigate multidecadal timescale variability of the partial pressure CO<subscript>2</subscript> (pCO<subscript>2</subscript>) that is due to the natural carbon cycle using a regional model forced with realistic climate and pre-industrial atmospheric pCO<subscript>2</subscript> for 1948-2009. Large-scale patterns of natural pCO<subscript>2</subscript> variability are primarily associated with basin-averaged sea surface temperature (SST) that, in turn, is composed of two parts: the Atlantic Multidecadal Oscillation (AMO) and a long-term positive SST trend. The North Atlantic Oscillation (NAO) drives a secondary mode of variability. For the primary mode, positive AMO and the SST trend modify pCO<subscript>2</subscript> with different mechanisms and spatial patterns. Warming with the positive AMO increases subpolar gyre pCO<subscript>2</subscript>, but there is also a significant reduction of dissolved inorganic carbon (DIC) due primarily to reduced vertical mixing. The net impact of positive AMO is to reduce pCO<subscript>2</subscript> in the subpolar gyre. Through direct impacts on SST, the net impacts of positive AMO is to increase pCO<subscript>2</subscript> in the subtropical gyre. From 1980 to present, long-term SST warming has amplified AMO impacts on pCO<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
- Subjects :
- CLIMATOLOGY
CARBON dioxide mitigation
BIOGEOCHEMICAL cycles
CHEMICALS
CLIMATE change
Subjects
Details
- Language :
- English
- ISSN :
- 18106277
- Volume :
- 12
- Issue :
- 17
- Database :
- Complementary Index
- Journal :
- Biogeosciences Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 110597101
- Full Text :
- https://doi.org/10.5194/bgd-12-15223-2015