The AOS Sulfur Dioxide Monitor (AOSSO2) instrument system measures ambient sulfur dioxide (SO2) concentrations. This trace gas is of importance to the study of atmospheric chemistry and air pollution.
Please monitor the b1-level aosso2 datastreams for all AOSSO2 instrument systems. When submitting DQPRs for the AOSSO2, please use the SO2 instrument class under the AOS Group.
For more information, please see the AOSSO2 Instrument web page.
The AOSSO2 is a component instrument within the Aerosol Observing System (AOS). For a more complete overview the AOS system and its general backing measurement theory, please see the AOS DQ Wiki page.
In the metrics table below, the primary measurement is outlined in red; all other measurements are diagnostic in nature. That primary field is:
The primary sulfur dioxide (SO2) mixing ratio is plotted on both daily and weekly timescales. Periods associated with twice-daily calibration maneuvers have been screened prior to plotting.
Note that in some more pristine environments, measured sulfur dioxide mixing ratios are ~0 or slightly negative. This is acceptable behavior; in reality, sulfur dioxide mixing ratios are likely very low in these cases.
In addition to the primary trace gas mixing ratio field, a number of SO2 diagnostic fields are also plotted to better monitor the "health" of the instrument. These diagnostic fields include instrument flow rates, temperatures, pressures and voltages.
The AOSSO2 is currently deployed at SGP E13 and AMF1. Both systems operate in a similar manner.
Known behaviors that do not require mention in DQAs or DQPRs can be documented here.
Past problems that may require mention in DQAs and possibly DQPRs can be documented here.