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Article on line: Scientists Invited to Collaborate in Satellite Mission’s Debut

6 hours 20 min ago
Available on EOS: Scientists Invited to Collaborate in Satellite Mission’s Debut

The Surface Water and Ocean Topography mission will begin by scanning Earth’s surface once a day. We invite ocean scientists to contribute ground-based measurements to compare with the satellite data.

By Rosemary Morrow, Lee-Lueng Fu, Francesco D’Ovidio, and J. Thomas Farrar See also: - Swot Orbit page - Image of the Month, July 2018: Adopting a Swot crossover for biophysical studies
Categories: Climate Science News

Release of Jason-3 and Saral/Altika GDR annual validation reports 2018

Tue, 2019-04-23 02:05
The executive summaries give the essential results of the validation: Jason-3 and Saral/Altika.  The annual reports describe the complete and detailed analysis: Jason-3 and Saral/Altika.  Find here more information about the Calibration and Validation (CalVal) activities.
Categories: Climate Science News

[Saral/AltiKa] Data information

Fri, 2019-04-19 01:26

Dear SARAL/Altika users,

 Please take note of the disclaimer below :

 SARAL/AltiKa satellite encounters since 3rd of February 2019 some issues affecting the nadir pointing accuracy. ISRO Operational Team in charge of the platform is doing many efforts to fix the issues and to recover a nominal mission as soon as possible.  

The availability and the quality of data measurements is degraded from time to time. Nevertheless, Cnes, EUMETSAT and ISRO have decided to continue the dissemination of the near real time and off-line products;  Therefore, before using the data, Users are invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²; otherwise standard quality flags may be used.

 

GDR cycle 126 (31 December 2018-04 February 2019 is just released today. It covers the beginning of the degraded period and you are encouraged to read the associated Cal/Val report available on AVISO+. In brief, during this cycle mispointing is quite larger than usual from pass 962 (03/02/2019 06:21:18 ) due to this attitude deviation. Hence a higher percentage of rejected measurements (up to  80%) is observed starting at pass 962. The attitude deviation also explains the higher percentage of missing measurements Users are advised not to use data with off_nadir_angle > 0.09deg².

Categories: Climate Science News

[Saral/AltiKa] Data information

Thu, 2019-04-18 00:24
Dear SARAL/Altika users,  Please take note of the disclaimer below :  SARAL/AltiKa satellite encounters since 3rd of February 2019 some issues affecting the nadir pointing accuracy. ISRO Operational Team in charge of the platform is doing many efforts to fix the issues and to recover a nominal mission as soon as possible.   The availability and the quality of data measurements is degraded from time to time. Nevertheless, Cnes, EUMETSAT and ISRO have decided to continue the dissemination of the near real time and off-line products;  Therefore, before using the data, Users are invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²; otherwise standard quality flags may be used. GDR cycle 126 (31 December 2018-04 February 2019 is just released today. It covers the beginning of the degraded period and you are encouraged to read the associated Cal/Val report available on AVISO+. In brief, during this cycle mispointing is quite larger than usual from pass 962 (03/02/2019 06:21:18 ) due to this attitude deviation. Hence a higher percentage of rejected measurements (up to  80%) is observed starting at pass 962. The attitude deviation also explains the higher percentage of missing measurements Users are advised not to use data with off_nadir_angle > 0.09deg².
Categories: Climate Science News

AVISO+ user satisfaction survey 2019

Tue, 2019-04-16 02:37
Please find the survey at the following address
https://www.aviso.altimetry.fr/en/survey/survey-2019.html This anonymous 5-7 minute-questionnaire aims at improving the quality of our products and services. It includes three subparts with questions about:
  • What altimeter user are you ?
  • The website Aviso+
  • The User Service Desk
     
All the answers are optional: if you're not concerned by one of these three subparts, you can ignore it and jump to next part. Your feedbacks are still constructive and encourage us trying to do better!

We thank you for your collaboration and invite you to return your e-answers before May, 5th 2019
Categories: Climate Science News

[Jason-3] Jason-3 is back

Fri, 2019-04-12 02:16

This Morning, on a pass at 07:00UTC(i.e. on cycle 116, pass 246) all JASON-3 core mission instruments were restarted :

-POSEIDON at 07:16:24UTC

-AMR at 07:18:12UTC

-GPSPB at 07:20:01UTC

The first post-SHM mission telemetry has been delivered. First IGDRs will be Distributed on Monday April 15th.

Categories: Climate Science News

[Jason-3]The Jason-3 spacecraft entered safe mode on Saturday, April 6, 2019 at 23:17:22 UTC

Tue, 2019-04-09 01:26
The Jason-3 spacecraft entered safe mode on Saturday, April 6, 2019 at 23:17:22 UTC, immediately interrupting its measurements. SEALEVEL j3 datasets in NRT are no longer updated with fresh data up to the recovery of the mission.   Investigation in progress on CNES side, the root cause has not yet been identified.
Categories: Climate Science News

April 2019: Pantanal wetlands

Wed, 2019-04-03 01:00
Swot will enable to see both the temporal variations and the spatial complexity of the Pantanal...
Categories: Climate Science News

[SSALTO/DUACS] Jason-3 back in the NRT system as the reference mission

Wed, 2019-03-27 03:25
A few weeks ago, the Jason-3 acquisition was stopped due to a safe-hold mode (SHM) event. The event itself was processed swiftly by the operations teams, and the ongoing Cal/Val investigations now report nominal quality metrics and no significant impact beyond the short interruption itself.   Because Jason-3 is the so-called reference altimeter in the multi-mission system DUACS (CMEMS Sea-Level TAC), the temporary unavailability called for an emergency procedure in the NRT system. The procedure uses a temporary anchor altimeter (here: Sentinel-3A) to stabilize the NRT system until the reference altimeter is back in operations.   Because the anchor is not a reference altimeter, the system slowly drifts away from what would have been produced with the reference altimeter (particularly in NRT). Now that Jason-3 has collected enough measurements after the SHM event, the drift was estimated. As expected it is small thanks to the good quality of Sentinel-3A, but not zero.   The procedure to seamlessly (no offset) reduce the drift to zero and to switch back to Jason-3 as the reference altimeter will be executed over this week where the system will be in a nominal status (no bias in the system).   All efforts are made to make this transition invisible to the CMEMS & DUACS end-users.   Please feel free to report any suspicious finding you might have during this period.
Categories: Climate Science News

Planned outage on Extraction service and TDS Saturday March 16th

Thu, 2019-03-14 02:58
Due to a planned outage, AVISO Extraction service and TDS (Opendap) are going to be unavailalble Saturday March 16th between 8h UTC and 15h UTC.
Categories: Climate Science News

Wind/Wave gridded products production recovery

Wed, 2019-03-13 03:45
There were problems on the 3 satellites used to compute wind/wave maps : Jason-3 in Safe Hold Mode, Jason-2 also and Saral/AltiKa with strong problems. All this leaded to a stop in the processing of those products. Since  March 11th, there are some maps which are produced but they only content OGDR data of Jason-3. As from March 12th, IGDR data of Jason-3 will be introduced. Jason-2 and Saral have still some problems, so the date to reintroduce them it is not planned yet. 
Categories: Climate Science News

[Jason-3] Jason-3 instruments have been restarted successfully

Thu, 2019-03-07 04:04
Jason-3 instruments have been restarted successfully on Wednesday, March, 6th, in cycle 113, pass 62 :
  • POSEIDON at 08:40:40UTC
  • AMR at 08:42:10UTC
  • GPSPB at 08:43:20UTC.
  The first telemetry from the satellite was available around 11UTC : OGDRs are now generated normally.
Categories: Climate Science News

March 2019: Focusing on small water bodies

Wed, 2019-03-06 04:22
SAR-altimetry mode implemented onboard Sentinel-3 can be further refined so as to reach 50 cm...
Categories: Climate Science News

ebruary 2019: New version of L2P Non Time Critical Sentinel-3A products

Tue, 2019-03-05 01:00
The new version 02_01 is disseminated by AVISO+ via ftp or AVISO+ CNES Data Center (see the product sheet) with unchanged access (available in version_02_01 folder). Note that the last cycle produced in version 02_00 has already been delivered (cycle 39). The next cycle 40 will be produced only in version 02_01.
The version 01_00 will be removed from the ftp site.  With this new version:
  • the input data are the “spring 2018 reprocessed” version of input NTC L2 products fully detailed in the EUMETSAT S3A STM reprocessing technical note
  • the retracking version is homogeneous for all the cycles
  • the standards are the same as in 02_00 version
  • the temporal coverage of L2P versions and L2 baseline used are:
   S3A L2P NTC version 02_01S3A L2P NTC version 02_00S3A L2P NTC version 01_00temporal coverage15/06/2016 → present15/06/2016 → 02/01/201815/06/2016 → 02/01/2018based on L2 baseline collection003002 (till 17/11/2017) and 003 afterwards002

 You will find the details in the handbook 

Categories: Climate Science News

[SSALTO/Duacs] Impact of Jason-3 unavailability in the NRT system

Thu, 2019-02-28 03:48
No OSTM/Jason-2 measurement is available since February 16th 2019 due to Safe Hold Mode (SHM) and SARAL-DP/AltiKa measurements are temporarily not used in the system since February 19th 2019 due to a satellite issue affecting the nadir pointing accuracy. Additionally, Jason-3 recently entered also in SHM and no  altimeter measurement is available since February 24th 2019. Due to the necessary period of time required to investigate and recover the nominal mission with full performance, Jason-3 measurements are expected back in the DUACS system on week 11/2019 at the earliest. Jason-3 is currently the reference mission in the DUACS system, i.e. that it ensures the homogeneity of the multi-mission datasets through the cross calibration process and the stability of the Mean Sea Level of the merged products.  To limit the lack of Jason-3 data in the real time products, the altimetry missions will be adjusted on Sentinel-3A instead of Jason-3. This new configuration will be implemented on the 29th of February and will last at least 1-2 weeks. The DUACS team will try to ensure a seamless transition during this period and until Jason-3 is ready to come back in the system.
Categories: Climate Science News

[Wind/Wave products] temporary interruption of merged production since February 27th 2019

Wed, 2019-02-27 07:24
Due to the interruption of upstream measurements: Jason-3, Jason-2 and Saral/Altika, the merged wind and wave products cannot be processed since today February 27th 2019.  We are sorry for the inconvenience
Categories: Climate Science News

[Jason-3] Jason-3 in Safe Hold Mode since Feb 24th 09:57:16TU

Mon, 2019-02-25 06:00
Our teams are currently investigating the exact reasons of that mispointing, in the objective of restarting Jason-3 measurements as soon as possible. We will keep you informed of the schedule for mission recovery. Christophe Marechal, CNES Jason 3 project manager on behalf of Jason-3 project managers from NOAA, EUMETSAT and JPL.
Categories: Climate Science News

[Sentinel-3A and Sentinel-3B] New added-value products available

Fri, 2019-02-22 00:07
We are pleased to inform you that the Along-track Significant Wave Height Level-2+ (L2P) products are now available for Sentinel-3A and Sentinel-3B. These mono-mission products contain calibrated (relative to buoys) along-track significant wave height (SWH), a validity flag and the applied bias correction.  These new products are processed by the Sentinel-3 L2P/L3 Marine Altimetry Service (CNES/CLS), in the frame of a EUMETSAT contract, part of the COPERNICUS Programme funded by the European Union.  The products are available in Near-Real Time and the service is pre-operational till mid-june 2019.  Please refer to the product sheet and disclaimer for more information. The details about the processing is described in the Product handbook. Dissemination: Sentinel-3 L2P are disseminated by AVISO+ (via ftp or AVISO+ CNES Data Center) and will also be disseminated by EUMETSAT via EUMETCast once the service will be fully operational, i.e. mid-June 2019. AVISO+ Access:
  • For new users, please see information and registration on the product page
  • For AVISO+ registered users, please, choose the product "Wave Along-track Level-2+ (L2P) Sentinel-3” in your private page
Categories: Climate Science News

25 January - 17 February Press review

Tue, 2019-02-19 08:16
NOAA announces the arrival of El Nino (NOAA, 14/02/2019) Satellites reveal a new view of Earth’s water from space (The Conversation, 13/02/2019) Eddies Influence Productivity in the Subtropical Open Ocean (EOS, 13/02/2019) Two sea level studies have some good news, bad news (Ars Technica, 02/08/2019) At many river deltas, scientists are missing a major source of sea level rise (Science Mag, 30/01/2019) River levels tracked from space (Science Daily, 29/01/2019) L’origine des vagues scélérates enfin expliquée ? (Actu Nautique, 15/02/2019) Comment le réchauffement planétaire conduit à une dégradation de la qualité de l’air (Science Post, 11/02/2019) Le réchauffement climatique va changer la couleur des océans (Futura Sciences, 10/02/2019) Réchauffement climatique : c’est officiel, 2018 a été la 4e année la plus chaude (Ultimate Pocket, 08/02/2019) Océans : une accumulation alarmante des produits plastiques (Le Journal International, 01/02/2019) Deux courtes animations résument plus de 150 ans de réchauffement climatique (Le Figaro, 28/01/2019) Anny Cazenave: “El aumento del nivel del mar está cambiado la forma de la Tierra” (El Pais, 28/01/2019) On line availability of articles depends on the Newspaper/magazine. We can't thus certify that above articles will be freely and permanently available.
Categories: Climate Science News

[Saral/AltiKa] SARAL/AltiKa satellite encountered since 3rd of February 2019 some issues affecting the nadir pointing accuracy

Tue, 2019-02-19 07:11
ISRO Operational Team in charge of the platform is doing investigations and tests in order to fix the issues and to recover a nominal mission as soon as possible. As a consequence, the availability and quality of products can be degraded from time to time.  Before using the data, Users are warned to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²; otherwise standard quality flags may be used
Categories: Climate Science News