Selectively and download subsets of our San Farncisco Bay data - create your own HTML or comma delimited files.
| There are two different ways to query this database:
Easy provides help and guidance so that you create a meaningful
query. All parameters are defined. Splits the process into 3 simple steps.
Expert is a single page containing all of the query options, without guidance available
to the user.
If you intend to use any data for any publication, thesis, report, etc... please review the citation page and also let us
know (email firstname.lastname@example.org) - - your publication helps us keep this database going.
In order to use the database properly and understand the limits of the data itself,
CTD and discrete measurements:
- available from 1969 through the most recent cruise.
- Light attenuation data not available 2002-2006.
- Time of day values for cruise data sampled 1981 through 1987 are estimates and accurate to within +/- 30 minutes.
Nutrient data are added quarterly to semi-annually
- NO2, NO3+2, NH3, PO4, and dissolved Si data are available 1969 through July 2013
- EXCEPT that NO2 data are not available for 2005 - 2011.
NOTE that nutrient data are not collected on all cruises or at all stations, see STRUCTURE below
The database is divided into 2 tables containing the CTD and nutrient data respectively.
In general, the CTD and nutrient tables may be considered one source of information. If your query contains both CTD and nutrient data, your results will include all of the CTD data
and any nutrient data collected at the same time/location as CTD data.
Nutrient data were usually collected at a small subset stations of the CTD data collection on any particular date.
On rare occasions, nutrient data were collected at times/locations when CTD data were not collected.
If you wish to view these data, only choose nutrient parameters, do not include CTD data in your query.
Discrete data/water grab samples (chlorophyll a, dissolved oxygen, and SPM) occur at a subset of CTD stations on
any particular cruise. Since 1988, these data are listed at the 2m and bottom depth bins where collected.
Light extinction coefficient is listed on the 1m line. Prior to 1988 when CTD use began, light attenuation is
on the 0.5m line and other discrete parameters were collected at variable depths (commonly 0.5m, 1m, and 2m).
To best inform your query, view the data table for your respective cruise to determine where data were
collected. You can start at Data Visualization, choose the year of interest year, then choose the cruise to view. For each cruise date's data plot page there is a button in the upper right hand corner that links to the data
table. Review the data table to understand the data from that date.
Please let us know if you are using our data in ANY publication (email email@example.com). It helps us keep this