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

Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions
Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions
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.
phytoplankton, ocean color, bathymetry, HNLC, North Pacific, iron
0148-0227
G02007-[12pp]
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Merico, A.
8e392a33-8ca8-4cea-9261-a0ca49112db1
Waniek, J.J.
749b55a4-c736-4961-a522-37645dd73b45
Wong, C.S.
6b64cde9-7d94-4faa-b07e-cd983436a21f
Metzl, N.
6706d42e-882c-4fb6-9be5-d212030c3966
Whitney, F.
93783b49-8c98-4cf9-b8d1-f54475d7231c
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Merico, A.
8e392a33-8ca8-4cea-9261-a0ca49112db1
Waniek, J.J.
749b55a4-c736-4961-a522-37645dd73b45
Wong, C.S.
6b64cde9-7d94-4faa-b07e-cd983436a21f
Metzl, N.
6706d42e-882c-4fb6-9be5-d212030c3966
Whitney, F.
93783b49-8c98-4cf9-b8d1-f54475d7231c

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

Abstract

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.

Full text not available from this repository.

More information

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

Identifiers

Local EPrints ID: 23974
URI: https://eprints.soton.ac.uk/id/eprint/23974
ISSN: 0148-0227
PURE UUID: 2e955cfb-33d3-402a-89a5-e559fa957a28
ORCID for T. Tyrrell: ORCID iD orcid.org/0000-0002-1002-1716

Catalogue record

Date deposited: 16 Mar 2006
Last modified: 06 Jun 2018 13:03

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