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| Titel |
Large variability in continental shelf production of phytoplankton carbon revealed by satellite |
| VerfasserIn |
B. F. Jönsson, J. E. Salisbury, A. Mahadevan |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-19), S.1213-1223 |
| Datensatznummer |
250005817
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| Publikation (Nr.) |
 copernicus.org/bg-8-1213-2011.pdf |
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| Zusammenfassung |
| We estimate the net production of phytoplankton in the Gulf of Maine (GoM)
over a 3-yr 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−2 d−1 in NCPe on spatial scales of
10–100 km. A region-wide median NCPe of
40–50 mg C m−2 d−1 is often prevalent in the Gulf, while blooms
attain peak values of 400 mg C m−2 d−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. |
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