Article

 

Comparison of the seasonal and interannual variability of phytoplankton pigment concentrations in the Peru and California Current systems Public Deposited

Analytics

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/wd375x62f

Copyright 1994 by the American Geophysical Union

Descriptions

Attribute NameValues
Creator
Abstract
  • Monthly composite images from the global coastal zone color scanner (CZCS) data set are used to provide an initial illustration and comparison of seasonal and interannual variability of phytoplankton pigment concentration along the western coasts of South and North America in the Peru Current system (PCS) and California Current system (CCS). The analysis utilizes the entire time series of available data (November 1978 to June 1986) to form a mean annual cycle and an index of interannual variability for a series of both latitudinal and cross-shelf regions within each current system. Within 100 km of the coast, the strongest seasonal cycles in the CCS are in two regions, one between 34° and 45°N and the second between 24° and 29°N, each with maximum concentrations (>3.0 mg m⁻³) in MayJune. Weaker seasonal variability is present north of 45°N and in the Southern California Bight region (32°N). Within the PCS, in the same 100-km-wide coastal region, highest (>45°S) and lowest (<20°S) latitude regions have a similar seasonal cycle with maximum concentrations (> 1.5 mg m⁻³) during the austral spring, summer, and fall, matching that evident throughout the CCS. Between these regions, off northern and central Chile, the seasonal maximum occurs during JulyAugust (austral winter), contrary to the influence of upwelling favorable winds. Within the CCS, the dominant feature of interannual variability in the 8-year time series is a strong negative concentration anomaly in 1983, an El Nino year. The relative value of this negative anomaly is strongest off central California and is followed by an even stronger negative anomaly in 1984 off Baja California. In the PCS, strong negative anomalies during the 1982-1983 El Nino period are evident only off the Peruvian coast and are evident there only in the regions 100 km or more from the coast. Although negative anomalies associated with the El Nino were not present at higher latitudes (more than approximately 20°S) in the PCS, the extremely sparse sampling weakens our confidence in the results of the interannual analysis in this region. An upper estimate of the systematic winter bias remaining in the global CZCS data after reprocessing with the multiple scattering algorithm is given in the appendix.
Resource Type
Date Available
Date Issued
Citation
  • Thomas, A. C., F. Huang, P. Ted Strub, and C. James. "Comparison of the seasonal and interannual variability of phytoplankton pigment concentrations in the Peru and California Current systems." Journal of Geophysical Research 99.C4 (1994): 7355-7370. Print.
Journal Title
Journal Volume
  • 99
Journal Issue/Number
  • C4
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-26T15:05:28Z (GMT) No. of bitstreams: 1 Thomas et al JGR 1994.pdf: 932020 bytes, checksum: b68eca6f336d45093230d04893609544 (MD5)
  • description.provenance : Submitted by Xiaoping Li (xiaoping.li@oregonstate.edu) on 2010-04-22T23:17:16Z No. of bitstreams: 1 Thomas et al JGR 1994.pdf: 932020 bytes, checksum: b68eca6f336d45093230d04893609544 (MD5)
  • description.provenance : Made available in DSpace on 2010-04-26T15:05:28Z (GMT). No. of bitstreams: 1 Thomas et al JGR 1994.pdf: 932020 bytes, checksum: b68eca6f336d45093230d04893609544 (MD5) Previous issue date: 1994-04-15

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
Default Thomas_et_al_JGR_1994.pdf 2017-07-21 Public