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warn_icon.gif IMPORTANT MESSAGE Sep 23, 2016    OCO-2 Post-anomaly Data Status   

The OCO-2 instrument experienced an anomaly that interrupted routine operations at 4:28 UTC on August 10, 2016 (Orbit 11212). The cause of the anomaly was resolved, and the instrument recovery process was initiated on August 14 by conducting a standard, week-long decontamination cycle.  The decontamination cycle was completed, and the instrument’s optical bench and detectors were at their nominal operating temperatures on 21 August (Orbit 11376). An initial analysis of the data indicated that, while the instrument was working nominally for science observations, its on-board calibration mechanism had not initialized properly, and was out of alignment, precluding the routine production and delivery of calibrated science data products.  The calibrator alignment issue was diagnosed and resolved on 20:34 UTC on September 15, 2016.  After validating the quality of the data, the standard version 7 (v7) forward streams for L1B and L2 data were reinitiated on September 20, 2016 (Orbit 11815). 

There will be a permanent data gap from August 10 (Orbit 11212) to August 21 (Orbit 11376) because no science observations were collected during that period.  The L1B and L2 science data collected between August 21 and September 20, while the calibrator was not aligned properly, will not be processed as part of the forward v7 data stream, but will be processed as part of the August and September retrospective products (v7r).  These data will be processed using a non-standard calibration product. Users should report any issues that they encounter with these data.

The A-Train Data Depot (ATDD) has been developed to process, archive, allow access to, visualize, analyze and correlate distributed atmospheric measurements from A-Train instruments.  The ATDD portal provides easy on-line data access and services for science, applications, and educational use so that users get exactly the data they want, and not large files of data which would take much time and effort by individuals to be co-registered and refined.


Choi-wan Snapshot from GoogleEarth



On September 15, 2009, the A-Train formation happened to fly over the super-typhoon Choi-wan. Just one such event can yield enormous amounts of data of various science content and format from the diverse A-Train sensors.  Plotting quickly  retrievals like cloud profiles, cloud top temperatures, rain rates,  water vapor content, etc.,  for head-to-head previews, is the strength of the Giovanni  web tool. An example of the  tool output is shown on the left. Apart from these 2-dimensional plots, Giovanni provides KMZ (GoogleEarth) format of the vertical atmospheric profiles (far left). Thus, it is now possible to combine horizontal and vertical data layers in one three-dimensional object, and preview data from different geometrical aspects. The far left plate shows a snapshot from a GoogleEarth KMZ file where CloudSat profiles are pictured together with MODIS/Aqua true-color image, and AMSR-E rain rate.

(Download the KMZ). 











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Last updated: May 01, 2013 02:02 PM ET