AVISO Climate Change News

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Updated: 11 weeks 6 hours ago

[Jason-2] Happy birthday Jason-2

Thu, 2019-06-20 07:22
Eleven years ago, on June 20, 2008, Jason-2 was successfully launched as a result of a collaboration between CNES, NASA, EUMETSAT and NOAA.   June 20, 2008. From the California base at Vandenberg, the Delta-2 rocket was launched to put the satellite into orbit. A few hours later, the payload instruments were on (the DORIS 1 precise orbit determination and positioning system at 18:45, the POSEIDON3-1 altimeter at 11:12, the AMR-H radiometer at 11:38, and the GPSPA at 11:40). Only two days later, the first near-real-time "OGDR" product was processed at CNES premises while NOAA and EUMETSAT began operational production in mid-July. Today, after more than 60,000  orbits around the Earth, Jason-2 is still in service with excellent performance in measuring ocean surface heights and we hope it will continue. Further information:
  • The mission Jason-2
  • Mission performance
  • Jason-2 videos on altimetry applications
Categories: Climate Science News

29 May - 17 June 2019 Press Review

Mon, 2019-06-17 09:58
Big earthquakes might make sea level rise worse. Here's how. (National Geographic, 17/06/2019) Mapped Area of Ocean Floor Doubles (The Marine Executive, 14/06/2019) Could more Hurricanes cool down the Atlantic? (News4Jax, 13/06/2019) Antarctic glaciers to honour 'satellite heroes' (BBC, 07/06/2019) Video: Perpetual ocean (EarthSky, 07/06/2019) These high-tech seals are charting future sea level rise (Pri, 03/06/2019) Antarctique : l'apparition de trous dans la banquise enfin expliquée (Science et Avenir, 14/06/2019) La plus grande opération de nettoyage de l'océan a officiellement débuté (Clubic, 09/06/2019) Espèces monstrueuses, pression phénoménale et noir complet : plongée dans les abysses avec les explorateurs des grands fonds (France TV info, 08/06/2019) La Méditerranée déborde de plastique : 600.000 tonnes rejetées par an ! (Futura planète, 07/06/2019) Océan : cartographier les fonds marins en HD en un temps record, un défi (Futura planète, 04/06/2019) Attention, trafic d'impulsions radar en or ! (CNES, 29/05/2019) 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

A glimpse on Swot satellite building and testing

Fri, 2019-06-14 06:59
A few photos showing building and testing of the future satellite Swot
Categories: Climate Science News

[SARAL/Altika] Cycle 128 GDR release

Wed, 2019-06-12 05:29
GDR cycle 128 (11 March 2019-15 April 2019) was just released recently. During this cycle, SARAL/AltiKa satellite regularly encountered mispointing events. The availability and the quality of data measurements continue to be degraded. Before using the data, users are still invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²)
Categories: Climate Science News

June 2019: Modelling the flow

Fri, 2019-06-07 08:20
SWOT will provide brand new capabilities for hydrological measurements and studies. Preparation are...
Categories: Climate Science News

[Jason-2] Jason-2 is back to work

Wed, 2019-05-22 03:36
All core mission instruments have been restarted today on the last available pass :
  • POSEIDON at 08:54:07UTC
  • AMR at 08:56:06UTC
  • GPSP at 08:59:15UTC
The first OGDRs will be available around 10:30UTC.   As a reminder, 2 maneuvers are still necessary to place Jason-2 correctly in order to resume the geodetic cycle #2, stopped on February 16th. According to the current plans, this should be achieved on Tuesday 28th of May.
Categories: Climate Science News

1- 19 May 2019 Press review

Mon, 2019-05-20 03:49
Nearly a quarter of West Antarctic ice is now unstable (University of Leeds, 16/05/2019) Water cycle wrapped (ESA, 15/05/2019) Image: Antarctica detailed in 3-D (Phys.org, 14/05/2019) Explorer Reaches Bottom of the Mariana Trench, Breaks Record for Deepest Dive Ever (LiveScience, 13/05/2019) Where Did All the Free-Flowing Rivers Go? (EOS, 08/05/2019) El Niño has rapidly become stronger and stranger, according to coral records (The Conversation, 06/05/2019) As Sea Levels Rise, Expect More Floods (EOS, 03/05/2019) Scientists track giant ocean vortex from space (EurekAlert!, 01/05/2019) Climat : avril 2019 quasi record de chaud (Le Monde, 16/05/2019) Changement climatique : six indicateurs qui montrent que la France n’est pas épargnée (Sud Ouest, 10/05/2019) 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 Cycle 127 GDR release

Fri, 2019-05-10 06:50
Dear SARAL/Altika users, Please take note of the disclaimer below :  GDR cycle 127 (04 February 2019-11 March 2019) was just released recently. During this cycle SARAL/AltiKa satellite regularly encountered mispointing events. The availability and the quality of data measurements continue to be degraded from time to time. CNES, EUMETSAT and ISRO inform users that removing any ocean data with “off_nadir_angle_wf” over 0.09 deg² will ensure a good data quality. Detailled information about calval analysis is given in this page. Quality assement report is available here.
Categories: Climate Science News

Maintenance on the Aviso+ Web services on May 14th 2019 between 10h and 10h15 UTC

Thu, 2019-05-09 05:53
Due to a maintenace, the Aviso+ web sites will be disrupted on May 14th between 10h and 10h15 UTC. This will concern, the website, the Aviso+ extraction service, the TDS (Opendap), and the Live Access Server (LAS)
Categories: Climate Science News

May 2019: Liguro-Provençal current seen by in situ instruments and altimetry

Tue, 2019-04-30 17:01
A multidata combined approach is a unique way to obtain a complete picture of a system as complex...
Categories: Climate Science News

[SARAL/Altika] Data quality : back to normal

Fri, 2019-04-26 07:59
Dear SARAL/Altika users,  We are pleased to inform you that the quality of data is almost back to normal. Indeed, ISRO teams have improved the pointing stability thanks to new operational procedures. Since April 19th 2019, the availability and the quality of data measurements are better (small time to time limited effects may anyway occur). Therefore, before using the data, Users are still invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²)
Categories: Climate Science News

[SARAL/Altika] Data quality : back to normal

Fri, 2019-04-26 07:52
Dear SARAL/Altika users,  We are pleased to inform you that the quality of data is almost back to normal. Indeed, ISRO teams have improved the pointing stability thanks to new operational procedures. Since April 19th 2019, the availability and the quality of data measurements are better (small time to time limited effects may anyway occur). Therefore, before using the data, Users are still invited to remove any ocean data with “off_nadir_angle_wf” over 0.09 deg²)
Categories: Climate Science News

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

Thu, 2019-04-25 08:35
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