[Keyword='aerial survey']
NMML Harbor Porpoise Aerial Survey, SE Alaska, 1991
Entry ID: seamap142

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Summary
Abstract: On 15 August 1991, as part of a larger study, Alaska harbor porpoise
(Phocoena phocoena) abundance was investigated during an aerial survey of
waters off southeastern Alaska. A Twin Otter was used to fly a single sawtooth
trackline at an altitude of 152.2 m (500ft) and at an airspeed of 100 kn.
Line-transect methodology was used, and only those observations made during
optimal conditions were analyzed. Density of harbor porpoises was calculated
using line transect estimates based on perpendicular distances of sightings to
the cruise track of the airplane.

Purpose: Although harbor porpoises, Phocoena phocoena, are known to occur
throughout Alaska waters (Fiscus et al. 1976; Leatherwood and Reeves 1978;
Lawry et al. 1982; Leatherwood et al. 1983), few estimates of abundance exist.
In 1991, the National Marine Mammal Laboratory initiated a 3-yr study on Alaska
harbor porpoises. The objectives of this program were to: 1) Obtain minimum
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Geographic Coverage
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Spatial coordinates   
  N: -0.46   S: -0.46   E: 36.21   W: 36.21

Data Set Citation
Dataset Originator/Creator: Dirk Verschuren, Kathleen R. Laird and Brian F. Cumming
Dataset Title: Rainfall and drought in equatorial east Africa during the past 1,100 years (fig. 1)
Dataset Release Date: January 27, 2000
Dataset Publisher: Nature
Issue Identification: No.6768, v403, pp 410-414
Online Resource: http://www.ncdc.noaa.gov/paleo/africa-drought.html
Temporal Coverage
Start Date: 0900-01-01
Stop Date: 1993-01-01
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Data Center
National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Supplemental Info
Data Center URL: http://www.ncdc.noaa.gov/
Dataset ID: NCDC_RainfallDroughtEastAfrica1100yrs1

Data Center Personnel
Name: KATHLEEN R. LAIRD
Contact Address:
Paleoecological Environmental Assessment and Research Lab.
Department of Biology
Queen's University
City: Kingston
Province or State: Ontario
Postal Code: K7L3N6
Country: Canada
Personnel
NOAA_PALEOCLIMATOLOGY_PROGRAM
Role: TECHNICAL CONTACT
Phone: 303-497-6280
Fax: 303-497-6513
Email: paleo at noaa.gov
Contact Address:
NOAA Paleoclimatology Program
325 Broadway, Code E/CC23
City: Boulder
Province or State: CO
Postal Code: 80305-3328
Country: USA
Publications/References
Dirk Verschuren, Kathleen R. Laird and Brian F. Cumming, Rainfall and drought in equatorial east Africa during the past 1,100 years, Nature, No.6768, v403, pp.410-414, January 27, 2000
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Creation and Review Dates
DIF Creation Date: 2010-01-25
Last DIF Revision Date: 2013-02-08

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