Effects of mesoscale physical processes on thin zooplankton layers at four sites along the west coast of the U.S. |
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| Authors: | Olivia M Cheriton Margaret A McManus D V Holliday Charles F Greenlaw Percy L Donaghay Tim J Cowles |
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| Institution: | 1.Ocean Sciences Department,University of California Santa Cruz,Santa Cruz;2.Department of Oceanography,University of Hawaii,Honolulu;3.Graduate School of Oceanography,University of Rhode Island,Narragansett;4.Texas;5.College of Oceanic and Atmospheric Sciences,Oregon State University,Corvallis;6.San Diego |
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| Abstract: | Within the coastal marine environment, populations of phytoplankton, zooplankton, bacteria, viruses, and aggregations of marine
snow are frequently concentrated beneath the surface in discrete, vertically thin layers. Thin layers range in vertical dimension
from a few centimeters to three meters, and have been observed to extend horizontally for kilometers. They appear in the water
column episodically and can persist for days. We present some of the results of an investigation of four coastal sites along
the west coast of the United States to assess frequency of occurrence of thin layers of zooplankton. Our study sites included
coastal sites near East Sound, Washington; Cape Perpetua, Oregon; Monterey Bay, California; and Santa Barbara, California.
At each site, we collected several, weeks-long time series of hydrography, current velocity, and acoustic backscatter due
to mesozooplankton. Our results show that thin layers were common features at all four sites. Across all study sites, a change
in the predominant physical regime, usually precipitated by a change in the wind pattern, corresponded with an absence of
thin Zooplankton layers. In order to make a first-order prediction about when thin layers have the possibility of occurring
in a coastal environment, we found it useful to examine regional wind and circulation patterns and to determine how they affect
stratification in each local environment. |
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