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| Titel: |
Large variability in continental shelf production of phytoplankton carbon revealed by satellite |
| Auteur: |
B. F. Jönsson J. E. Salisbury A. Mahadevan |
| Verschenen in: |
Biogeosciences discussions |
| Paginering: | Jaargang 7 (2010) nr. 6 pagina's 8953-8978 |
| Jaar: |
2010 |
| Inhoud: |
We estimate the net production of phytoplankton in the Gulf of Maine (GoM) over a 3-year period using satellite ocean color data in conjunction with surface velocities from a high-resolution operational ocean circulation model. Chlorophyll (chl-a) and light attenuation (K490) products are combined with a carbon to chlorophyll model to estimate the phytoplankton carbon (PC) stock in the euphotic layer. A satellite-based productivity, termed NCPe in analogy with net community production (NCP), is derived by tracking changes in satellite-derived PC from one satellite image to the next, along water parcel trajectories calculated with surface velocities from the ocean circulation model. Such an along-trajectory analysis of satellite data discounts the effect of advection that would otherwise contribute to the temporal change between consecutive images viewed in the fixed reference frame. Our results show a high variability of up to ± 500 mg C m<sup>−2 d<sup>−1 in NCPe on spatial scales of 10–100 km. A region-wide median NCPe of 40–50 mg C m<sup>−2 d<sup>−1 is often prevalent in the Gulf, while blooms attain peak values of 400 mg C m<sup>−2 d<sup>−1 for a few days. The spatio-temporal variability of NCPe in this region, though conditioned by seasonality, is dominated by events lasting a few days, which if integrated, lead to large inter-annual variability in the annual carbon budget. This study is a step toward achieving synoptic and time-dependent estimates of oceanic productivity and NCP from satellite data. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 74 van 146 gevonden artikelen
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