Access Ocean Color Data from the GES DISC DAAC

1. Access Ocean Color Data from the GES DISC DAAC Suhung Shen James G. Acker Denis Nadeau George Serafino Goddard Earth Sciences (GES) Data and Information Services Center (DISC) Distributed Active Archive Center (DAAC) NASA Goddard Space Flight Center Greenbelt, Maryland 20771 USA Archive System and Distribution Statistics Introduction Ocean Color Data are measurements of the light intensity at visible wavelengths, which are related to the presence of phytoplankton and particles in the water. The data have been widely used to study marine optical properties, biological productivity, air-sea interaction, and for other research topics. The GES DISC DAAC has archived ocean color data from several different sensors, including the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) on OrbView-2 and the Coastal Zone Color Scanner (CZCS) on Nimbus 7. The SeaWiFS data are from September 1997 to present, available with two weeks delay from real-time. The CZCS data are available from October 1978 to June 1986. Data Archive & Distribution System Architecture SeaWiFS Data Monthly Archive/Distribution Volume Data Provider DAAC Web Ordering service Poster Design and Production by Jenn Mahoney, 2001 3rd Users 2nd Transfer 1st EOSDIS service Volume (GB) Oracle Database Ingest FTP Validation Subscription Order Archive SeaWiFS Data Products CZCS Data Products 1st 2nd Unix Indicates SeaWifS Project Global Reprocessing Data Clean Number of SeaWiFS Data Orders Cumulative Distributed Products (Compressed Volumes, to the end of December 2000) Total Distributed Volume: 23 TB L3 Daily 2164 GB HRPT 8424 GB L3 8-Day 2187 GB L2 GAC 2842 GB Access Data Online: http://daac.gsfc.nasa.gov http://daac.gsfc.nasa.gov/data/dataset/SEAWIFS/ L1A GAC 3398 GB Data Access Subsets Science Focus Web Page(s) Regional Subsets of SeaWiFS HRPT Station Data (1 kilometer resolution data) • WWW Browser: • Spatial and temporal searching • Viewing individual “browse” images • Selecting desired files • Ordering on-line documents • Subscription: • As data arrive, they are automatically placed in an order and sent to users • Frequent, regular requests (daily, weekly, monthly, annually) HROM HNSG HJMS HMBR HHOB SeaWiFS Data Restrictions Sample Imagery Chlorophyll Concentrations Off of the South Carolina Shoreline April 25, 1998 • Registration Required • Users of SeaWiFS data (including collaborators of research papers) are required to register with the SeaWiFS Project to become SeaWiFS Authorized Research Users • Username & Password Required • GES DISC DAAC issues a username and password to SeaWiFS Authorized Research Users • Data is FREE to authorized users • Charges Apply for Commercial Use of SeaWiFS Data Coccolithophorid Blooms In the Bering Sea April 25, 1998 SeaWiFS Image of Fires Near San Diego, California January 3, 2001 SeaWiFS Image September 15-16, 1997 Global Biosphere of Northern Hemisphere Summer • June 1998-August 1998 On April 25, 1998, the SeaWiFS instrument obtained a nearly cloud-free image of the U.S. East Coast. This image shows the chlorophyll concentrations in the ocean waters off the shoreline of South Carolina. Both the flow of the Gulf Stream and the related communities of marine phytoplankton are affected by the Charleston Bump. Los Angeles Salton Sea Channel Is. San Diego SeaWiFS Points of Contact • General Email:daacuso@daac.gsfc.nasa.gov • Ocean Color Email:ocean@daac.gsfc.nasa.gov • GES DISC DAAC Toll Free Help Desk:(1-877) 422-1222 • GES DISC DAAC Fax Line:(301) 614-5268 • GES DISC DAAC Online:http://daac.gsfc.nasa.gov .01 .02 .03 .05 .1 .2 .3 .5 1 2 3 5 10 15 20 30 50 Chlorophyll a Concentration (mg/m3) Composite of all SeaWiFS land and ocean data acquired on September 15-16, 1997. Land and cloud are in “true color,” while derived ocean chlorophyll concentrations are colored as in the color scale.