Continuous Monitoring of Underwater Light in Indian River Lagoon: Comparison of Cosine and Spherical Sensors.

Rubicon Research Repository/Manakin Repository

Continuous Monitoring of Underwater Light in Indian River Lagoon: Comparison of Cosine and Spherical Sensors.

Show full item record


Title: Continuous Monitoring of Underwater Light in Indian River Lagoon: Comparison of Cosine and Spherical Sensors.
Author: Hanisak, MD
Abstract: The ecological importance of submerged aquatic vegetation (SAV) in estuaries and coastal zones throughout the world is well established. Water clarity and the availability of light determine seagrass productivity and abundance and the maximal depth to which different seagrass species will grow, or indeed, if they will grow at all. A comparison was made of continuous readings of underwater photosynthetically active radiation (PAR)and light attenuation (k) measured by two types of sensors (spherical and cosine), as part of a study on SAV-PAR interactions in Indian River Lagoon (Florida). The ratio of k calculated from cosine:spherical sensors was fairly constant; over the course of the whole year, cosine sensors provided estimates of k ca. 25% higher than those calculated from spherical sensors. Estimates of k ranged from 0.80-0.92 and 0.64-0.75, respectively, for cosine and spherical sensors. Although cosine sensors provided the same temporal (diel, monthly, and seasonal)patterns of PAR and k as spherical sensors, spherical sensors are recommended over cosine ones for future SAV/PAR monitoring because (1) spherical sensors measure all photons available for photosynthesis by seagrasses and other primary producers and (2) PAR and k are less quickly altered by sensor fouling.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/4641
Date: 1997

Files in this item

Files Size Format View
AAUS_1997_9.pdf 2.610Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record

Browse

My Account