Episodic Upwelling of Zooplankton within a Bowhead Whale Feeding Area Near Barrow, AK

• Main Authors: Ashjian, Carin J., Campbell, Robert G., Okkonen, Stephen R., Stafford, Kathleen M.
• Other Authors: WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
• Format: Text
• Language: English
• Published: 2008
• Subjects: Ecology; Biological Oceanography; Physical and Dynamic Oceanography; *WHALES; ALASKA; CLIMATE; MIGRATION; DOPPLER SYSTEMS; BIOPHYSICS; FEEDING; AQUATIC ANIMALS; ZOOPLANKTON; BEAUFORT SEA; OCEAN CURRENTS; UNDERWATER ACOUSTICS; BOWHEAD WHALES; BEAUFORT SHELF; CTD(CONDUCTIVITY TEMPERATURE DEPTH); ADCP(ACOUSTIC DOPPLER CURRENT PROFILERS); BARROW CANYON; VPR(VIDEO PLANKTON RECORDERS); CLIMATE CHANGE; Barrow Canyon; Beaufort Shelf; Lowry; Pacific; Barrow; Beaufort Sea; bowhead whale; Episodic Upwelling of Zooplankton within a Bowhead Whale Feeding Area near Barrow, AK; Sea ice; Alaska
• Online Access: http://www.dtic.mil/docs/citations/ADA533028; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA533028

Our long term goals are to understand (1) the biological-physical oceanographic characteristics and mechanisms on the shelf near Barrow, AK that together produce a favorable feeding environment for the bowhead whale there and (2) the potential impact of climate change, particularly the ongoing reduction in sea ice and variability in Pacific water presence near Barrow, on this feeding environment. This region is a critical feeding area for migrating bowhead whales, particularly during the fall migration (e.g., Lowry et al., 2004). Results from biophysical sampling conducted during August-September 2005- 2007 demonstrated that the oceanography of the shelf is complex, dynamic, and highly variable and that advection is closely coupled to the direction and magnitude of the winds. In addition, oceanographic and atmospheric conditions impact the composition, distribution, and availability of plankton prey for the bowhead whale. Assessment and understanding of interannual and longer-term variability in the physical mechanisms influencing ocean conditions and the resulting distribution and abundance of plankton on the shelf are necessary to predict potential impacts of climate change. Prepared in cooperation with University of Rhode Island, Narragansett, RI; and Univeristy of Washington, Seattle, WA. The original document contains color images.