EPA Science Inventory

Glacial Influences on Solar Radiation in a Subarctic Sea.

Citation:

BARRON, M. G. AND K. J. BARRON. Glacial Influences on Solar Radiation in a Subarctic Sea. PHOTOCHEMISTRY AND PHOTOBIOLOGY. American Society of Photobiology, 81(1):187-189, (2005).

Description:

Understanding macroscale processes controlling solar radia­tion in marine systems will be important in interpreting the potential effects of global change from increasing ultraviolet radiation (UV) and glacial retreat. This study provides the first quantitative assessment of UV in the water column of Prince William Sound, a subarctic, semienclosed sea sur­rounded by mountains, glaciers, rivers, bays and fjords in south central Alaska. Glacial influences on diffuse attenuation coefficients (Kd) were determined along an approximate 120 km transect running NE (61°07’43"N, 146°17’1"W) to SW (60°27’25"N, 148°05’27" W). Glacial meitwater and flour caused a 10-fold increase in Kd for visible light, UV-A and UV-B, whereas high optical clarity was present In a diversity of areas away from glacial influences. Transition areas and locations affected by calving of a tidewater glacier had intermediate Kd values. Depths at 99% attenuation ranged from less than 0.2 m near glacial streams to greater than 5 m in bays and open ocean distant from sources of glacial sediments. These results suggest that potential global change from increasing UV and glacial retreat may have heteroge­neous effects on subarctic marine systems

Purpose/Objective:

This study provides quantitaive assessment of UV in the water column of Prince William Sound, Alaska

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 01/01/2005
Completion Date: 01/01/2005
Record Last Revised: 09/17/2013
Record Created: 09/24/2008
Record Released: 09/24/2008
OMB Category: Other
Record ID: 199447

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB

GULF ECOLOGY DIVISION

BIOLOGICAL EFFECTS AND POPULATION RESPONSE BRANCH