Decadal changes in global ocean chlorophyll
Abstract
The global ocean chlorophyll archive produced by the CZCS was revised using compatible algorithms with SeaWiFS. Both archives were then blended with in situ data to reduce residual errors. This methodology permitted a quantitative comparison of decadal changes in global ocean chlorophyll from the CZCS (1979–1986) and SeaWiFS (1997–2000) records. Global spatial distributions and seasonal variability of ocean chlorophyll were similar, but global means decreased over the two observational segments. Major changes were observed regionally: chlorophyll concentrations decreased in the northern high latitudes while chlorophyll in the low latitudes increased. Mid‐ocean gyres exhibited limited changes. The overall spatial and seasonal similarity of the two data records suggests that the changes are due to natural variability. These results provide evidence of how the Earth's climate may be changing and how ocean biota respond.
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Gregg and Conkright (2002) identified that global Chl-a means were decreasing.
“Gregg and Conkright (2002) compared global Chl-a variation from 1979to 1986 (CZCS) and from 1997 to 2000 (SeaWiFS).They identified that global Chl-a means were decreasing.”
From Recent Trends in SST, Chl‐<i>a</i>, Productivity and Wind Stress in Upwelling and Open Ocean Areas in the Upper Eastern North Atlantic Subtropical Gyre (2021) · cites this paper as Gregg and Conkright (2002)
Cites
Biological and Chemical Response of the Equatorial Pacific Ocean to the 1997-98 El Niño
Chavez, F. P., Strutton, P. G., Friederich, G. E., Feely, R. A., Feldman, G. C., Foley, D. G., & McPhaden, M. J. (1999) · Science · doi:10.1126/science.286.5447.2126 · Cited by 642 · see citing works
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Siemer, J. P., Machín, F., González‐Vega, A., Arrieta, J. M., Gutiérrez‐Guerra, M. A., Pérez‐Hernández, M. D., Vélez‐Belchí, P., Hernández‐Guerra, A., & Fraile‐Nuez, E. (2021) · Journal of Geophysical Research: Oceans · doi:10.1029/2021jc017268 · Cited by 50 · see citing works
- Authors
- Gregg, W. W., & Conkright, M. E.
- Affiliations
- Goddard Space Flight Center (US)
- National Oceanic and Atmospheric Administration (US)
- ORCID
- Gregg, Watson W.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2002-08
- Volume
- 29
- Issue
- 15
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1578421673
- Cited by
- 192
- References
- 1
- Citations by year
- 2026: 4 · 2025: 5 · 2024: 5 · 2023: 5 · 2022: 4 · 2021: 8 · 2020: 7 · 2019: 9 · 2018: 7 · 2017: 9 · 2016: 4 · 2015: 8 · 2014: 15 · 2013: 9 · 2012: 8
- FWCI
- 8.95
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geophysical Research Letters (publishedVersion)
- NASA STI Repository (National Aeronautics and Space Administration) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- ocean chlorophyll, decadal variability, Coastal Zone Color Scanner, SeaWiFS, ocean color remote sensing, natural climate variability
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