Accession Number:

ADA456690

Title:

Biological and Chemical Microstructure in Coastal Areas

Descriptive Note:

Final performance/technical rept. Mar 2003-Aug 2006

Corporate Author:

CALIFORNIA UNIV REGENTS LA JOLLA CA SCRIPPS INST OF OCEANOGRAPHY

Personal Author(s):

Report Date:

2006-10-02

Pagination or Media Count:

7.0

Abstract:

We developed and deployed a 2D planar laser imaging fluorometer system mounted on a free-falling vehicle. The vehicle also carried a CTDfluorometer, an optical nitrate sensor, and a microstructure profiler, to acquire vertical profiles of particle fluorescence and chemical and physical distributions in the field. Our data, gathered 10 km offshore of San Diego, showed large variations in fluorescent particle properties size-frequency distributions with depth, with changes over 2-5 m that were larger than changes seen at a single depth over 1000s of kilometers. The phytoplankton were randomly distributed over scales 10 cm, but shoed pronounced gradients over larger scales. Layers -1 m thick of unusual particle properties e.g., large particles, or long particles were common, though these layers did not appear as features in the total fluorescence profiles. Such cryptic layers are likely a common occurrence, driven by the interleaving of existing horizontal patches by the vertical shear.

Subject Categories:

  • Biological Oceanography
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE