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| Titel |
Climate impacts on the structures of the North Pacific air-sea CO2 flux variability |
| VerfasserIn |
V. Valsala, S. Maksyutov, M. Telszewski, S. Nakaoka, Y. Nojiri, M. Ikeda, R. Murtugudde |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 1 ; Nr. 9, no. 1 (2012-01-25), S.477-492 |
| Datensatznummer |
250006677
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| Publikation (Nr.) |
 copernicus.org/bg-9-477-2012.pdf |
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| Zusammenfassung |
| Some dominant spatial and temporal structures of the North Pacific air-sea
CO2 fluxes in response to the Pacific Decadal Oscillation (PDO) are
identified in three data products from three independent sources: an
assimilated CO2 flux product and two forward model solutions. The
interannual variability of CO2 flux is found to be an order of
magnitude weaker compared to the seasonal cycle of CO2 flux in the
North Pacific. A statistical approach is employed to quantify the
signal-to-noise ratio in the reconstructed dataset to delineate the
representativity errors. The dominant variability with a signal-to-noise
ratio above one is identified and its correlations with PDO are examined. A
tentative four-pole pattern in the North Pacific air-sea CO2 flux
variability linked to PDO emerges in which two positively correlated poles
are oriented in the northwest and southeast directions and contrarily, the
negatively correlated poles are oriented in the northeast and southwest
directions. This pattern is identified in three products, providing CO2
and pCO2. Its relations to the interannual El Niño-Southern
Oscillation (ENSO) and lower-frequency PDO are separately identified. A
combined EOF analysis between air-sea CO2 flux and key variables
representing ocean-atmosphere interactions is carried out to elicit robust
oscillations in the North Pacific CO2 flux in response to the PDO. The
proposed spatial and temporal structures of the North Pacific CO2
fluxes are insightful since they separate the secular trends of the surface
ocean carbon from the interannual variability. The regional characterization
of the North Pacific in terms of PDO and CO2 flux variability is also
instructive for determining the homogeneous oceanic domains for the Regional
Carbon Cycle and Assessment Processes (RECCAP). |
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