Welcome to the Globec NE Pacific Project Satellite Data Archive.

OSU College of Oceanography

 

 

OSU Physical Oceanography

Pathfinder Composites
Globec AVHRR
SeaWiFS
Altimeter
GOES Composites


Note: SST and surface pigment concentration data are now available and other data will be added in the future.

At this website, one can view satellite fields over the regions of interest to the U.S. GLOBEC North-East Pacific (NEP) program ( http://globec.coas.oregonstate.edu/groups/nep/ ). Funding to create and maintain this web site is provided by NSF (Ocean Sciences - Biological Oceanography) and NASA (Earth Science Enterprise - Biological Oceanography).The viewable satellite fields will eventually include: (1) Sea Surface Temperature (SST) from the NOAA AVHRR sensors over three regions - the California Current System (CCS), the coastal Gulf of Alaska (CGOA) and the entire NE Pacific, (NEP) with 1km, 3km and 9km resolutions; (2) surface pigment concentrations from the SeaWiFS sensor over the CCS and CGOA with 4km resolution; and (3) gridded surface height fields from altimeters over the entire NEP and specific regions, with resolutions to be determined by requests for specific applications.

At present, AVHRR SST and SeaWiFS surface pigment concentration data are available: 9-km resolution Pathfinder fields over the entire NEP and 1-3km resolution fields over the CCS and GOA (see below). Data is available through anonymous ftp at ftp://coho.coas.oregonstate.edu/ebc.   For detail about data access and methods please see DATA_ACCESS_Oct11_07 and for data sources and formats see AAGBCREADME.TXT.


Other environmental data of interest to U.S. GLOBEC NEP researchers (coastal winds, temperatures, sea levels, upwelling indices, etc., are available on the website maintained by the Pacific Environmental Fisheries Laboratory (http://www.pfeg.noaa.gov/).


Pathfinder 9 km Weekly Composites (20-63N), (170-100W)

These composites are created from 9 km Pathfinder AVHRR data available from the NOAA/NASA Physical Oceeanography Page (http://podaac.jpl.nasa.gov/).
The global images are subsetted to the NE Pacific Region and composite images are created by taking the warmest pixel from any image during a 9 day period. The images are 796 samples x 489 lines.

 

Weekly and monthly images are available for years 1985 through 1999 composited from the 9 km Version 4.1 daily Pathfinder AVHRR images and years 2000 through June 2003 of the Version 4.1 "interim" data.

Click the following links to see an example of these weekly composites comparing the surface temperatures during a "normal" year (1996) and an El Nino year period in 1997-1998. (1996 vs. 1997 and 1996 vs. 1998)

 


1 km & 3 km AVHRR Images

These AVHRR images are obtained from a single pass of one of the NOAA AVHRR-equipped satellites. The present US GLOBEC project is funding the collection and processing of 1-km SST (absolute temperature derived from multichannel algorithms) and 3-km radiance temperature from channel 4 (11 micron).
East Region
August 7, 2001, 2200 hrs
North Region
August 3, 1998, 2200 hrs
 
West Region
June 27, 2001, 1200 hrs
South Region
April 18, 1998, 0200 hrs
These data were captured and processsed by Ocean Imaging of San Diego, Ca. and are usually available for viewing on this website the day after they are collected and may be available from the ftp site with 12 hours of collection.

The database contains images beginning as early as 1992 for some areas up through the present. The 1 km data is processed using a multi-channel algorithm and Quality Control assessments of accuracy, is available for four regions. The southern region covers 18.76N-39.23N, 106.70W-132.29W, the eastern Pacific from southern California to central Mexico. The northern region covers 35.76N-56.23N, 117.76W-138.23W, from British Columbia to northern California . The eastern region, 49.6N-62.4N, 124.8W-145.2W, covers the eastern Gulf of Alaska and British Columbia. And the western region, 49.6N-62.4N, 144.8W-165.2W, covers the western Gulf of Alaska off the Aleutian Peninsula.

As part of each filename are indicators of the relative quality, or cloudiness of subregions in each area as a rough guide for the user to better select images to view. See AAGBCREADME.TXT and MAPS.

CH4: Central Region
August 3, 1998, 2200 hrs
 
  Channel 4 Images: These 3 km images indicate radiance temperature from channel 4 of the AVHRR and covers three regions: east and west Gulf of Alaska (the areas of the previous 1km images) and the central northeastern Pacific from Vancouver Island south to Baha Mexico, 23.14N-53.83N and 108.14W-138.83W.

California Current
October 9, 1992, 2300 hrs
California Current
October 4, 1994, 0400 hrs


The FTP site archives additional historical data of AVHRR channel 4 radiance temperature (right). For July, 1992 through October, 1997, images covering 35.007N - 40.98N and 129.035W - 121.450W are available. A slightly more northerly region: 40.975N - 46.952N and 129.394W - 121.09W is archived for January, 1994 - October, 1997. In both cases, the resolution is approximately 1.3 km.



For a complete description of these data please see the ftp area readme file AAGBCREADME.TXT.

Alternate access to processed and cloud flagged absolute SST over the California Current, University of Rhode Island:

The same California Current AVHRR passes that have been processed at Ocean Imaging have also been processed by Peter Cornillon's group at the University of Rhode Island (but through mid-2001 as of June 2004). These images are available as processed, cloud-masked SST; they can be viewed and accessed at http://dods.gso.uri.edu/dodsview/view.cgi. Click on the "Known Data Sets" drop down menu and then choose either the Northeast Pacific 1 km declouded data or the 6 km version. Specify the data range tp look at, then get the files that appear clear. The URI data are served via OPeNDAP (a.k.a. DODS) and can be imported into IDL or Matlab. More information and the software needed can be found at http://opendap.org/.

 


SeaWiFS

The SeaWiFS  (Sea-viewing Wide Field Sensor) is a color imaging instrument aboard an ORBIMAGE satellite (now GeoEye) used to measure chlorophyll in the ocean. Applied as an indicator of biomass, chlorophyll can help trace the movement of water masses and nutrients as they react under the influence of winds, currents and other physical forces. Estimates of biomass are also important in the effective management of commercially important marine species.

The images viewable on this web site are rendered from remapped daily composites of the original 4km GAC data provided courtesy of Dr. Andrew Thomas of the University of Maine, School of Marine Sciences. These images are also available from the Satellite Oceanography Data Lab (SODL), Image Library. The data are proprietary to GeoEye and made available to researchers with permission from NASA as an Authorized SeaWiFS Data User.

Data available at this site consists of daily and 8-day remapped composite GIF images and the original chlorophyll concentration data stored in Hierarchical Data Format (HDF). Concentration data for the 8-day composites are available only through explicit permission from Dr. Andrew Thomas. Coverages include the Gulf of Alaska and the California Current from 1997 through 2005.

   Daily Composite Images    Eight Day Composite Images

 


Altimeter data
Still under construction

At present, contact Ted Strub (tstrub@coas.oregonstate.edu) about this data.


For questions e-mail: tstrub@coas.oregonstate.edu