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Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions

Tyrrell, T., Merico, A., Waniek, J.J., Wong, C.S., Metzl, N. and Whitney, F. (2005) Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions Journal of Geophysical Research, 110, (G2), G02007-[12pp]. (doi:10.1029/2005JG000041).

Record type: Article


We calculated correlations between seafloor depth and phytoplankton blooms in all three main high-nitrate, low-chlorophyll (HNLC) regions, but with a particular focus on the subarctic North Pacific area. It has long been known that the central parts of the east and west subarctic North Pacific are HNLC regions. The deep western basin of the Bering Sea is also HNLC, whereas the wide continental shelf of the eastern Bering Sea is not. We carried out a statistical comparison of spatial maps of (1) seafloor depth and (2) chlorophyll a concentration from satellite data. This comparison reveals that shallow waters have, on average, higher peak chlorophyll a concentrations (more intense phytoplankton blooms) than deep waters (p 0.01). Possible artifacts of the satellite data are considered but it is concluded that the signal is genuine, in part because the same patterns are found in in situ data. There are several possible explanations for the observed correlation; the most probable, we suggest, is that iron diffusing out of the seafloor causes alleviation of iron limitation in shallow waters.

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Published date: November 2005
Keywords: phytoplankton, ocean color, bathymetry, HNLC, North Pacific, iron


Local EPrints ID: 23974
ISSN: 0148-0227
PURE UUID: 2e955cfb-33d3-402a-89a5-e559fa957a28
ORCID for T. Tyrrell: ORCID iD

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Date deposited: 16 Mar 2006
Last modified: 17 Jul 2017 16:15

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Author: T. Tyrrell ORCID iD
Author: A. Merico
Author: J.J. Waniek
Author: C.S. Wong
Author: N. Metzl
Author: F. Whitney

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