.png){kind=icon}
.png){kind=icon}
Return
Upper-Ocean Variability of the Marine Carbonate System in the Northeast Pacific
.png){kind=icon}
OA
AI
A
D
R
A
DOI：10.1029/2025GB008762.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
In the Northeast Pacific, the marine carbonate system's variability across timescales is not well constrained. Here, we quantify observed seasonal and non-seasonal variability in Dissolved Inorganic Carbon (DIC), partial pressure of carbon dioxide ( pCO 2 ${\text{pCO}}_{2}$ ) and aragonite saturation state Ω a $\left({{\Omega }}_{a}\right)$ and discuss potential drivers. We used three decades of observations from four Line P time series stations, the longest marine carbonate system time series in the Northeast Pacific (1990–2019). To gauge the spatial extent of the variability patterns, we used output from a global ocean model representing the observed period. In the Northeast Pacific, seasonal and non-seasonal pCO 2 ${\text{pCO}}_{2}$ variability at 10 m was minimal, mostly damped by the opposing influence of DIC and temperature changes at both seasonal and interannual timescales. For DIC and Ω a ${{\Omega }}_{a}$ , the seasonal cycle dominated total variability in the top 60–70 m, with mean-transect 10 m seasonal amplitudes of 35 ± $\pm $ 3 μmol kg − 1 ${\text{kg}}^{-1}$ and 0.31 ± $\pm $ 0.04, respectively. In the upper 60–70 m, the magnitude of non-seasonal variability was at least half that of the seasonal variability for most variables. From five climate indices examined, we focused on the basin-scale Pacific Decadal Oscillation index (PDO) to investigate potential drivers of non-seasonal variability, with 20%–40% of the non-seasonal variability in DIC and Ω a ${{\Omega }}_{a}$ associated to this index. In the Northeast Pacific, positive PDO periods were linked to a mean reduction in 10 m DIC of 5 μmol kg − 1 ${\text{kg}}^{-1}$ and an increase in 10 m Ω a ${{\Omega }}_{a}$ of 0.04 for each PDO unit increase, which could potentially reduce the occurrence and severity of ocean acidification events. The opposite could be expected during negative PDO periods.
Keywords:
seasonal variability
interannual variability
pacific decadal oscillation
dissolved inorganic carbon
ocean acidification
Gaussian process regression
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
5.5
Papers:
3.2K
Citations:
1.7W
Organization
Cited Papers