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    North Pacific carbon cycle response to climate variability on seasonal to decadal timescales

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    2005JC003173.pdf (2.716Mb)
    Date
    2006-07-04
    Author
    McKinley, Galen A.  Concept link
    Takahashi, Taro  Concept link
    Buitenhuis, Erik T.  Concept link
    Chai, Fei  Concept link
    Christian, James R.  Concept link
    Doney, Scott C.  Concept link
    Jiang, Mingshun  Concept link
    Lindsay, Keith  Concept link
    Moore, J. Keith  Concept link
    Le Quere, Corinne  Concept link
    Lima, Ivan D.  Concept link
    Murtugudde, Raghu  Concept link
    Shi, L.  Concept link
    Wetzel, Patrick  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1168
    As published
    https://doi.org/10.1029/2005JC003173
    DOI
    10.1029/2005JC003173
    Keyword
     Ocean carbon cycle; Ocean models; PDO 
    Abstract
    Climate variability drives significant changes in the physical state of the North Pacific, and thus there may be important impacts of climate variability on the upper ocean carbon balance across the basin. We address this issue by considering the response of seven biogeochemical ocean models to climate variability in the North Pacific. The models’ upper ocean pCO2 and air-sea CO2 flux respond similarly to climate variability on seasonal to decadal timescales. Modeled seasonal cycles of pCO2 and its temperature and non-temperature driven components at three contrasting oceanographic sites capture the basic features found in observations [Takahashi et al., 2002, 2006; Keeling et al., 2004; Brix et al., 2004]. However, particularly in the Western Subarctic Gyre, the models have difficulty representing the temporal structure of the total pCO2 cycle because it results from the difference of these two large and opposing components. In all but one model, the airsea CO2 flux interannual variability (1σ) in the North Pacific is smaller (ranges across models from 0.03 to 0.11 PgC/yr) than in the Tropical Pacific (ranges across models from 0.08 to 0.19 PgC/yr), and the timeseries of the first or second EOF of the air-sea CO2 flux has a significant correlation with the Pacific Decadal Oscillation (PDO). Though air-sea CO2 flux anomalies are correlated with the PDO, their magnitudes are small (up to ±0.025 PgC/yr (1σ)). Flux anomalies are damped because anomalies in the key drivers of pCO2 (temperature, dissolved inorganic carbon (DIC) and alkalinity) are all of similar magnitude and have strongly opposing effects that damp total pCO2 anomalies.
    Description
    Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 111 (2006): C07S06, doi:10.1029/2005JC003173.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Journal of Geophysical Research 111 (2006): C07S06
     

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