| Date: | 2019-07-11 03:16:46 | |
| Sender: | epavlis@umbc.edu | |
| Subject: | [SLR-Mail] No.2583: Re-relase of WLRS and SOSW SLR data | |
| Author: | Stefan Riepl | |
| Content: | Dear all, This message is primarily directed to SLR analysts, however, due to the large amount of data affected we are sending this notice via the widest distribution list of the ILRS (SLRmail). As some of you are already aware, the Wettzell station suffered a ~1 hPa bias due to the incorrect accounting of the barometer location with respect to the IRP and a slight drift for several years, affecting all data that used its observations to provide met info on their data records. This email relates only to the data from the two SLR systems at Wettzell: a) WLRS (8834) : start date we were given was 2012/08/10 and the end date was 2019/05/28 (inclusive) b) SOSW (7827) : since their first release in 2014 and up to 2019/05/28 18:15 UT All data from these sites spanning the above time periods (different for each one!) were corrected, validated and resubmitted to the DCs with an incremented release flag. At this point the data are available at both DCs, EDC and CDDIS. Please download the latest release of SLR data that you use from these systems and replace the old ones in your local data bases with the corrected release immediately. This message is particularly important for the ASC ACs who should use the CORRECTED data for the re-anlaysis we are generating at this time (SSEM PP, final step). For more details please read the three email messages appended below, where the station teams explain what happened. If you have any questions, please do not hesitate to contact the stations for more details. ecp > Begin forwarded message: > > From: Stefan Riepl > Subject: [SLR-Mail] No.2574: 7827 site and history log update > Date: June 3, 2019 at 4:33:54 AM EDT > To: > > ******************************************************************************** > SLR Electronic Mail > ******************************************************************************** > Author: Stefan Riepl > > The 7827 site and history log needed an update, since the > latest calibration of the pressure sensor used at the Geodetic Observatory Wettzell revealed an offset of -0.25hPa. A backtracking analysis of the sensor offset revealed a drift of approx. -0.025hPa/year. As a consequence the existing pressure sensor was replaced by a calibrated one on 2019-05-28 18:15 UT. > Data recorded at 7827 after that date is delivered with correct pressure readings. > All data recorded and delivered before 2019-05-28 18:15 UT will be corrected in a new release which will be finalized during week 24. > The updated site log is awaiting approval at the EDC. > We regret for any inconvenience. > > Best regards, > > Stefan Riepl > > ******************************************************************************** > Begin forwarded message: > > From: Stefan Riepl > Subject: [SLR-Mail] No.2575: 7827 new data release > Date: June 14, 2019 at 9:14:15 AM EDT > To: > > ******************************************************************************** > SLR Electronic Mail > ******************************************************************************** > Author: Stefan Riepl > > The re-release of data from 7827 (SOS-W) concerning the pressure correction is completed now. > As mentioned in my previous slrmail all data from 7827 taken before 2019-05-28 18:15UT is affected and a new version is released for this period. > Any users are kindly asked to update their data archive. > We regret for any inconvenience. > With best regards, > Stefan Riepl > ******************************************************************************** > Begin forwarded message: > > From: ”U.Schreiber” > Subject: [SLR-Mail] No.2580: Pressure corrections for 8834 > Date: July 9, 2019 at 11:11:33 AM EDT > To: > > ******************************************************************************** > SLR Electronic Mail > ******************************************************************************** > Dear colleagues, > > The Wettzell Laser Ranging System (WLRS) 8834 had obtained a small system bias in the observations between > 2012 and 2019. The error was that the height correction between the pressure sensor and the invariant point of the > system went missing. We have rectified that problem and reprocessed all data files in the respective period. The > corrected files were uploaded to the EDC database. The pressure sensor itself was substituted for a different unit, > which has been calibrated by our national meteo service, prior to the installation. The change of the pressure sensor > took place on May 29, 2019. > > The exact period that has been reprocessed is starting on and including August 10, 2012. The last day that needs to > be corrected is on and including May, 28, 2019. > > All data from and including May, 29, 2019 onwards have both, the height correction included and read the new pressure > sensor, which is the same sensor that SOS-W (7827) uses. > > Kind regards, Ulli > > ------------------------------------------------------------------------------- > Prof. Ulrich Schreiber > Forschungseinrichtung Satellitengeodaesie > Technische Universitaet Muenchen > - Fundamentalstation Wettzell - > D-93444 Bad Koetzting > Tel.: +49 9941 603113 > Fax.: +49 9941 603222 > schreiber@fs.wettzell.de > ulrich.schreiber@tum.de > ----------------------------------- > Prof. Ulrich Schreiber > School of Physical and Chemical Sciences > Dodd Walls Centre of Photonics and Quantum Technologies > University of Canterbury > Private Bag 4800 > Christchurch, 8020 > New Zealand > Fax: +64 3 3642469 > ulrich.schreiber@canterbury.ac.nz > > > ******************************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Dr. Erricos C. Pavlis Phone:+1 (410)-455-5832 Research Professor FAX: +1 (410)-455-5868 US Mobile: +1-(240)-381-9879 EU Mobile: +30-694-241-5079 Chair, ILRS Analysis Standing Committee Editor, The European Physical Journal Plus Assoc. Editor, Celestial Mechanics & Dynamical Astronomy Joint Center for Earth Systems Technology, (JCET/UMBC) University of Maryland, BC & NASA Goddard 61A TRC #182 1000 Hilltop Circle Baltimore, Maryland U S A 21250 epavlis@umbc.edu ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Dear all, This message is primarily directed to SLR analysts, however, due to the large amount of data affected we are sending this notice via the widest distribution list of the ILRS (SLRmail). As some of you are already aware, the Wettzell station suffered a ~1 hPa bias due to the incorrect accounting of the barometer location with respect to the IRP and a slight drift for several years, affecting all data that used its observations to provide met info on their data records. This email relates only to the data from the two SLR systems at Wettzell: a) WLRS (8834) : start date we were given was 2012/08/10 and the end date was 2019/05/28 (inclusive) b) SOSW (7827) : since their first release in 2014 and up to 2019/05/28 18:15 UT All data from these sites spanning the above time periods (different for each one!) were corrected, validated and resubmitted to the DCs with an incremented release flag. At this point the data are available at both DCs, EDC and CDDIS. Please download the latest release of SLR data that you use from these systems and replace the old ones in your local data bases with the corrected release immediately. This message is particularly important for the ASC ACs who should use the CORRECTED data for the re-anlaysis we are generating at this time (SSEM PP, final step). For more details please read the three email messages appended below, where the station teams explain what happened. If you have any questions, please do not hesitate to contact the stations for more details. ecp
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Dr. Erricos C. Pavlis Phone:+1 (410)-455-5832 Research Professor FAX: +1 (410)-455-5868 US Mobile: +1-(240)-381-9879 EU Mobile: +30-694-241-5079 Chair, ILRS Analysis Standing Committee Editor, The European Physical Journal Plus Assoc. Editor, Celestial Mechanics & Dynamical Astronomy Joint Center for Earth Systems Technology, (JCET/UMBC) University of Maryland, BC & NASA Goddard 61A TRC #182 1000 Hilltop Circle Baltimore, Maryland U S A 21250 epavlis@umbc.edu ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |