Skip to main content

IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (0): add | show Print this page

Seasonal carbon dynamics in the near‐global ocean
Keppler, L.; Landschützer, P.; Gruber, N.; Lauvset, S.K.; Stemmler, I. (2020). Seasonal carbon dynamics in the near‐global ocean. Global Biogeochem. Cycles 34(12): e2020GB006571. https://dx.doi.org/10.1029/2020gb006571
In: Global Biogeochemical Cycles. American Geophysical Union: Washington, DC. ISSN 0886-6236; e-ISSN 1944-9224, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine/Coastal

Authors  Top 
  • Keppler, L.
  • Landschützer, P., more
  • Gruber, N.
  • Lauvset, S.K.
  • Stemmler, I.

Abstract
    The seasonal cycle represents one of the largest signals of dissolved inorganic carbon (DIC) in the ocean, yet these seasonal variations are not well established at a global scale. Here, we present the Mapped Observation-Based Oceanic DIC (MOBO-DIC) product, a monthly DIC climatology developed based on the DIC measurements from GLODAPv2.2019 and a two-step neural network method to interpolate and map the measurements. MOBO-DIC extends from the surface down to 2,000 m and from 65°N to 65°S. We find the largest seasonal amplitudes of surface DIC in the northern high-latitude Pacific (30 to >50 μmol kg−1). Surface DIC maxima occur in hemispheric spring and minima in fall, driven by the input of DIC into the upper ocean by mixing during winter, and net community production (NCP) driven drawdown of DIC over summer. The seasonal pattern seen at the surface extends to a nodal depth of <50 m in the tropics and several hundred meters in the subtropics. Below the nodal depth, the seasonal cycle of DIC has the opposite phase, primarily owing to the seasonal accumulation of DIC stemming from the remineralization of sinking organic matter. The well-captured seasonal drawdown of DIC in the mid-latitudes (23° to 65°) allows us to estimate the spring-to-fall NCP in this region. We find a spatially relatively uniform spring-to-fall NCP of 1.9 ± 1.3 mol C m−2 yr−1, which sums to 3.9 ± 2.7 Pg C yr−1 over this region. This corresponds to a global spring-to-fall NCP of 8.2 ± 5.6 Pg C yr−1.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors