Cited by 99Oceanographic and Atmospheric ProcessesClimate variability and modelsMarine and coastal ecosystems

Long‐term and seasonal trends in stratification in the California Current, 1950–1993

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Palacios, Daniel M., Bograd, Steven J., Mendelssohn, Roy, Schwing, Franklin B.·2004·Journal of Geophysical Research: Oceans

Abstract

State‐space model decomposition of subsurface temperatures from the World Ocean Database is used to detect and characterize changes in thermal stratification in the upper 200 m of the California Current System (CCS) over the period 1950–1993. Model results are analyzed at eight locations representing the meridional and offshore extent of the CCS between 31°N and 40°N. Thermocline strength, depth, and temperature are derived from the mean‐level trend term and the seasonal component of the state‐space models. Over the 44 years, the mean level of the coastal thermocline strengthened and deepened, while it weakened and shoaled offshore. These tendencies are likely the result of geostrophic adjustment to changes in basin‐scale circulation, as well as to a long‐term increase in upper ocean heat content of 2–9% throughout the study area. Reduction in nutrient inputs to the surface layer resulting from these climate signals are a likely explanation for the pronounced decline in biological production in CCS ecosystems observed over the same period. Substantial decadal variability superimposed on these linear tendencies may play a role in determining the response of the upper ocean to interannual events such as El Niño. The seasonal component of thermocline depth and strength exhibited a high degree of nonstationarity, with alternating periods of weakened and enhanced annual cycles lasting 3–5 years, along with changes in the phase. This changing seasonality may have implications for marine species whose life cycles are closely tuned to the seasonal cycle.

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  • Upper ocean warming could increase water column stratification, potentially counteracting the effects of intensifying upwelling-favorable winds by reducing the efficacy of coastal upwelling to deliver nutrients to the euphotic zone.

    “Upper ocean warming could increase water column stratification [37][38][39], potentially counteracting the effects of intensifying upwelling-favorable winds by reducing the efficacy of coastal upwelling to deliver nutrients to the euphotic zone.”

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  1. C10016 21562202c, 2004, C10, Downloaded from https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2004JC002380, Wiley Online Library on [08/10/2023]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License
  2. C10016 21562202c, 2004, C10, Downloaded from https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2004JC002380, Wiley Online Library on [08/10/2023]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License

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Authors
Palacios, D. M., Bograd, S. J., Mendelssohn, R., & Schwing, F. B.
Affiliations
NOAA National Marine Fisheries Service (US)
Venue
Journal of Geophysical Research: Oceans
Published
2004-10
Volume
109
Issue
C10
ISSN
0148-0227 (ISSN-L)
OpenAlex
W1993530104
Cited by
99
References
30
Citations by year
2026: 1 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 5 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 5 · 2015: 7 · 2014: 6 · 2013: 18 · 2012: 5
FWCI
2.83
Type
journal article
Language
en
Open access
Locations
Journal of Geophysical Research Atmospheres (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
Keywords
thermocline depth, California Current System, long-term trends, seasonal variation, subsurface temperature, upper ocean heat content, geostrophic adjustment, nutrient inputs, decadal variability, El Niño, non-stationarity

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