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MMS Central/Northern California Low-altitude birds and mammals

Entry ID: seamap41

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Summary

Abstract: Principal Investigator(s)/Affiliation: Thomas P. Dohl, Center for Marine Studies, University of California, Santa Cruz.Marine Mammal and Seabird Surveys Of Central And Northern California Studies: -- Central/Northern Calif - Low Aerial [Birds and Mammals] Study Code: CL Contract Number: 14-12-0001-29090

Purpose: To determine species composition, distribution, abundance, and seasonal variation for marine mammal and seabird populations, provide a description of habitat use, and identify areas of special biological importance to these populations in the central and northern California study area.

SUPPLEMENTAL INFORMATION:

DATA COLLECTION:
TIME ... PERIOD: February 1980 through June 1983
STUDY AREA: Shelf, slope, and offshore waters to a distance of 100 nm off the California coast from Point Conception to the California-Oregon boundary.

METHODOLOGY: Offshore transect surveys were flown twice-monthly at two different altitudes (200 ft and about 750-1,000 ft ASL) along approximately 40 east-west transect lines extending an average of 60 nm offshore. The transects sampled on a given survey were selected randomly from a set of 92 standard (predetermined) lines spaced at intervals of 5' of latitude. Standard transects provided systematic coverage of shelf, slope, and offshore waters in the study area. Sightings of seabirds, pinnipeds, and sea otters were recorded only on low-altitude surveys. Sightings of cetaceans and turtles were recorded on both low- and high-altitude surveys. Seabird sightings were recorded only on the shaded side of the aircraft within a strip transect of 50 m width. Marine mammal and turtle sightings were recorded within an unbounded corridor on both high- and low-altitude surveys, but only the shaded side of the aircraft was searched on the low-altitude surveys. Cross-legs connecting standard transects were searched only on high-altitude surveys. Offshore cross-legs were searched on both sides of the aircraft, while only the nearshore side was searched on cross-legs along the coast. Declination angle was measured and noted for each marine mammal/turtle sightings and later used to calculate a probability density function of frequency with right-angle sighting distance. Navigation was by Loran and VLF-Omega.

DATABASES PRODUCED: Three databases of sightings at sea were produced by these studies (data on numbers of seabirds and pinnipeds on land were also collected but are not addressed in the present study). These include 1) sightings of cetaceans and turtles recorded on 36 high-altitude aerial surveys, 2) sightings of cetaceans, pinnipeds, sea otters, and turtles recorded on 36 low-altitude aerial surveys, and 3) sightings of seabirds on 36 low-altitude aerial surveys. Each sighting database is accompanied by files providing the search effort on transect and environmental characteristics of the waters surveyed (e.g., sea surface temperature).

CURRENTNESS REFERENCE: ground condition

SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224

Related URL

Link: GET DATA

Description: Access data from the OBIS and OBIS-SEAMAP websites.

Service Citation

Originators: NASA Ames Research Center, University of Montana
Title: Terrestrial Observation and Prediction System (TOPS)
Provider: NASA Ames Research Center
URL: http://ecocast.arc.nasa.gov/

Service Keywords

HAZARDS MANAGEMENT >HAZARDS MITIGATION

HAZARDS MANAGEMENT >HAZARDS PLANNING

Science Keywords

AGRICULTURE >AGRICULTURAL PLANT SCIENCE >CROPPING SYSTEMS

AGRICULTURE >FOREST SCIENCE >FOREST PROTECTION

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Project

ESIP > Earth Science Information Partners Program

Ancillary Keywords

REANALYSIS MODELS

Data Set Progress

COMPLETE

Data Center

Research Data Archive, Computational and Information Systems Laboratory, National Center for Atmospheric Research, University Corporation for Atmospheric Research

Data Center URL: http://rda.ucar.edu/
Dataset ID: 093.2

Data Center Personnel
Name: RDA HELP DESK Phone: (303)-497-1231 Fax: (303)-497-1291 Email: dssweb at ucar.edu Contact Address: National Center for Atmospheric Research CISL/DSS P.O. Box 3000 City: Boulder Province or State: CO Postal Code: 80307 Country: U.S.A.

Distribution

Distribution Size: 4.906 Tbytes

Distribution Format: GRIB2 > General Regularly-distributed Information in Binary form, Edition 2

Personnel

BOB DATTORE

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: (303)-497-1825

Fax: (303)-497-1291

Email: dattore at ucar.edu

Contact Address:

National Center for Atmospheric Research

CISL/DSS

P.O. Box 3000

City: Boulder

Province or State: CO

Postal Code: 80307

Country: U.S.A.

Publications/References

Saha, Suranjana, et. al. (2010), The NCEP Climate Forecast System Reanalysis, Bull. Amer. Meteor. Soc. v, doi:10.1175/2010BAMS3001.1, http://journals.ametsoc.org/doi/pdf/10.1175/2010BAMS3001.1

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2011-01-14

Last DIF Revision Date: 2013-05-23

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