Climate Science News

12-19 February, 2017 week

AVISO Climate Change News - Thu, 2017-02-23 01:52
Les glaciers alpins fondent à très grande vitesse (Le Monde, 2017/02/16)
Sentinels Warn of Dangerous Ice Crack (ESA, 2017/02/16)
Des fluctuations climatiques très semblables d’un bout à l’autre de la chaine alpine et une fonte des glaciers qui s’accélère depuis 2003 (CNRS, 2017/02/15)
Atlantique Nord : le risque d'un refroidissement rapide au XXIe siècle revu à la hausse (CNRS, 2017/02/15)
Pacific Wind and Current Changes Bring Warm, Wild Weather (Earth Observatory, 2017/02/14)
La pollution chimique gagne les abysses (Le Monde, 2017/02/13)
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

5-12 February, 2017 week

AVISO Climate Change News - Thu, 2017-02-16 08:37
Climat : les mangroves s'avèrent de loin l'écosystème qui stocke le plus de carbone (Science et Vie, 2017/02/10)
Les manchots du Cap menacés par la surpêche et le réchauffement climatique (Sciences et Avenir, 201/02/10)
Comprendre le comportement des forêts tropicales dans le cadre du système climatique changeant de la Terre (MédiaTerre, 2017/02/03)
Climate change could trigger strong sea level rise (Space Daily, 2017/01)
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

22 January - 5 February, 2017 weeks

AVISO Climate Change News - Thu, 2017-02-09 03:23
Tara. Des récifs coralliens en danger (Telegramme, 2017/02/05)
El Niño n'explique pas tout (Pour la Science, 2017/02)
Oceanographic analysis offers potential crash site of MH370 (Terradaily, 2017/01/24)
Une animation de la NASA montre l'ampleur du réchauffement climatique (Le Monde, 2017/01/23)
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

2017 ushers in record low extent

NSIDC Artic Sea Ice News - Tue, 2017-02-07 12:18

Record low daily Arctic ice extents continued through most of January 2017, a pattern that started last October. Extent during late January remained low in the Kara, Barents and Bering Seas. Southern Hemisphere extent also tracked at record low levels for January; globally, sea ice cover remains at record low levels.

Overview of conditions extent map

Figure 1. Arctic sea ice extent for January 2017 was 13.38 million square kilometers (5.17 million square miles). The magenta line shows the 1981 to 2010 median extent for that month. Sea Ice Index data. About the data

Credit: National Snow and Ice Data Center
High-resolution image

Arctic sea ice extent for January 2017 averaged 13.38 million square kilometers (5.17 million square miles), the lowest January extent in the 38-year satellite record. This is 260,000 square kilometers (100,000 square miles) below January 2016, the previous lowest January extent, and 1.26 million square kilometers (487,000 square miles) below the January 1981 to 2010 long-term average.

Ice growth stalled during the second week of the month, and the ice edge retreated within the Kara and Barents Seas, and within the Sea of Okhotsk. After January 16, extent increased at a more rapid pace, but the rate of ice growth was still below average for January as a whole. For a few days towards the end of the month, the extent was slightly greater than recorded in 2006, a year which also saw many record low days in January, but by the 30th it was tracking below 2006. Through most of January the ice edge remained north of the Svalbard Archipelago, largely due to the inflow of warm Atlantic water along the western part of the archipelago. However, by the end of January, some ice was found to the northeast and northwest of Svalbard. At the end of January, ice extent remained well below average within the Kara, Barents, and Bering Seas.

Conditions in context time series graph

Figure 2a. The graph above shows Arctic sea ice extent as of February 5, 2017, along with daily ice extent data for four previous years. 2016 to 2017 is shown in blue, 2015 to 2016 in green, 2014 to 2015 in orange, 2013 to 2014 in brown, and 2012 to 2013 in purple. The 1981 to 2010 average is in dark gray. The gray areas around the median line show the interquartile and interdecile ranges of the data. Sea Ice Index data.

Credit: National Snow and Ice Data Center
High-resolution image

Figure 2b. The plot shows Arctic air temperature difference from average, in degrees Celsius, for January 2017.

Credit: NSIDC courtesy NOAA/ESRL Physical Sciences Division
High-resolution image

January air temperatures at the 925 hPa level (approximately 2,500 feet above sea level) were above average over nearly all of the Arctic Ocean, continuing the pattern that started last autumn (Figure 2b). Air temperatures were more than 5 degrees Celsius (9 degrees Fahrenheit) above the 1981 to 2010 average over the northern Barents Sea and as much as 4 degrees Celsius (7 degrees Fahrenheit) above average in the northern Chukchi and East Siberian Seas. It was also unusually warm over northwestern Canada. Cooler than average conditions (up to 3 degrees Celsius, or 5 degrees Fahrenheit below average) prevailed over the northwest part of Russia and the northeast coast of Greenland.

Atmospheric circulation over the Arctic during the first three weeks of January was characterized by a broad area of below average sea level pressure extending over almost the entire Arctic Ocean. Higher-than-average sea level pressure dominated over the Gulf of Alaska and the North Atlantic Ocean south of Iceland. This set up warm southerly winds from both the northern North Atlantic and the Bering Strait areas, helping to explain the high January air temperatures over the Arctic Ocean. According to the analysis of NASA scientist Richard Cullather, the winter of 2015 to 2016 was the warmest ever recorded in the Arctic in the satellite data record. Whether the winter of 2016 to 2017 will end up warmer remains to be seen; conditions are typically highly variable. For example, during the last week of January, the area of low pressure shifted towards the Siberian side of the Arctic. In the northern Laptev Sea, pressures fell to more than 20 hPa below the 1981 to 2010 average. This was associated with a shift towards cooler conditions over the Arctic Ocean, which may explain why ice extent towards the end of the month rose above levels recorded in 2006.

January 2017 compared to previous years trend graph

Figure 3. Monthly January ice extent for 1979 to 2017 shows a decline of 3.2 percent per decade.

Credit: National Snow and Ice Data Center
High-resolution image

Through 2017, the linear rate of decline for January is 47,400 square kilometers (18,300 square miles) per year, or 3.2 percent per decade.

Amundsen Sea nearly free of ice S_daily_extent_hires

Figure 4. Antarctic sea ice extent for February 5, 2017 shows the Amundsen Sea nearly free of ice. The orange line shows the 1981 to 2010 median extent for that day. Sea Ice Index data. About the data

Credit: National Snow and Ice Data Center
High-resolution image

Extent is tracking at records low levels in the Southern Hemisphere, where it is currently summer. As shown in this plot for February 5, this is primarily due to low ice extent within the Amundsen Sea, where only a few scattered patches of ice remain. By contrast, extent in the Weddell Sea is now only slightly below average. This pattern is consistent with persistent above average air temperatures off western Antarctica.

Further reading

Cullather, R. I., Y.-K. Lim, L. N. Boisvert, L. Brucker, J. N. Lee, and S. M. J. Nowicki. 2016. Analysis of the warmest Arctic winter, 2015-2016. Geophysical Research Letters,43, doi:10.1002/2016GL071228.

Categories: Climate Science News

Feb. 2017: Tidal currents make a buoy's path spiral

AVISO Climate Change News - Tue, 2017-02-07 02:55
Altimetry helped to improve the tide models, including tidal currents. A, Argonautica buoy path can...
Categories: Climate Science News

15-22 January, 2017 week

AVISO Climate Change News - Thu, 2017-01-26 07:36
Montée des océans : les scientifiques découvrent un élément préoccupant (Le Point, 2017/01/20)
Comment le réchauffement climatique pourrait redessiner la carte du monde (Geo, 2017/01/19)
Nouveau record de chaleur sur Terre en 2016 (Presse Océan, 2017/01/18)
La fonte des glaces en Antarctique menace une station scientifique (Le Figaro, 2017/01/17)
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

Jason-3 mini-web sites contest now open

AVISO Climate Change News - Mon, 2017-01-23 07:59
Discover the role of Jason-3, the European-American oceanography satellite launched at the beginning of 2016 to study the climate and the environment, by taking part in the Jason-3 mini-site competition*.
Use the resources made available by the various stakeholders in this space project, to design a mini-site which reflects your understanding of satellite-based Earth observation of climate and biodiversity changes.
The competition is limited to primary, middle and high school classes. The articles may be written in French or English. CNES will be awarding a prize for the best production for each of the three school levels. The winning sites will be highlighted on CNES web sites and social networks and those of its partners.

*Open 7 November 2016 to 28 April 2017
Categories: Climate Science News

Jason-3 mini-web sites contest now open

AVISO Climate Change News - Mon, 2017-01-23 07:59
Discover the role of Jason-3, the European-American oceanography satellite launched at the beginning of 2016 to study the climate and the environment, by taking part in the Jason-3 mini-site competition*.
Use the resources made available by the various stakeholders in this space project, to design a mini-site which reflects your understanding of satellite-based Earth observation of climate and biodiversity changes.
The competition is limited to primary, middle and high school classes. The articles may be written in French or English. CNES will be awarding a prize for the best production for each of the three school levels. The winning sites will be highlighted on CNES web sites and social networks and those of its partners.

*Open 7 November 2016 to 28 April 2017
Categories: Climate Science News

Temporary unavailability of the ODES Service on January 31, 2017

AVISO Climate Change News - Thu, 2017-01-19 01:31
For maintenance reason, the ODES Service (http://odes.altimetry.cnes.fr) is unavailable from...
Categories: Climate Science News

Live Access Server (LAS) temporarily interrupted on January 18, 2017

AVISO Climate Change News - Wed, 2017-01-18 07:53
Due to a technical problem the Live Access Server is temporarily interrupted. We apologize for the...
Categories: Climate Science News

Live Access Server (LAS) temporarily interrupted on January 18, 2017

AVISO Climate Change News - Wed, 2017-01-18 07:53
Due to a technical problem the Live Access Server is temporarily interrupted. We apologize for the...
Categories: Climate Science News

Sentinel-3A : Short time Critical Value added products now available

AVISO Climate Change News - Tue, 2017-01-17 06:23
Mid-December 2016, we were pleased to inform you that a new type of Corrected Sea Surface Heights products (also known as L2P products) were now available for Sentinel-3A in Near Real Time.
 
These mono-mission products contain along-track corrected sea surface heights with respect to a mean sea surface, corrections and geophysical parameters. The last versions of altimetric standards are used and there is a homogenized format for all satellites. These products are processed by the Sentinel-3 L2P/L3 Marine Altimetry Service (CNES/CLS), in the frame of a EUMETSAT contract, funded by the European Union.
 
Today, we are pleased to inform you that CorSSH Short Time Critical (STC) products are released in pre-operational phase. They are available on the ftp server from January 12, 2017 (cycle 13 pass 241). Please refer to the product sheet and disclaimer for more information.
 
All users have to subscribe to get access: please fill in the registration form by choosing “Sentinel-3 Along-Track Level-2+ “ even if you're already subscribed.
 
Sentinel-3A CorSSH are disseminated by AVISO+ (via authenticated ftp or AVISO+ CNES Data Center) and in the near future, when the service will become operational, it will also be disseminated by EUMETSAT (via EUMETCast, EUMETSAT Data Centre and potentially via CODA).

L2P Sea Level Anomaly from Sentinelle 3A cycles 12/13 (between Decembre 14th, 2016 and January 9th, 2017). Credits CLS/CNES/EUMETSAT.

 


 
AVISO+ Service Desk
Categories: Climate Science News

Sentinel-3A : Short time Critical Value added products now available

AVISO Climate Change News - Tue, 2017-01-17 06:23
Mid-December 2016, we were pleased to inform you that a new type of Corrected Sea Surface Heights products (also known as L2P products) were now available for Sentinel-3A in Near Real Time.
 
These mono-mission products contain along-track corrected sea surface heights with respect to a mean sea surface, corrections and geophysical parameters. The last versions of altimetric standards are used and there is a homogenized format for all satellites. These products are processed by the Sentinel-3 L2P/L3 Marine Altimetry Service (CNES/CLS), in the frame of a EUMETSAT contract, funded by the European Union.
 
Today, we are pleased to inform you that CorSSH Short Time Critical (STC) products are released in pre-operational phase. They are available on the ftp server from January 12, 2017 (cycle 13 pass 241). Please refer to the product sheet and disclaimer for more information.
 
All users have to subscribe to get access: please fill in the registration form by choosing “Sentinel-3 Along-Track Level-2+ “ even if you're already subscribed.
 
Sentinel-3A CorSSH are disseminated by AVISO+ (via authenticated ftp or AVISO+ CNES Data Center) and in the near future, when the service will become operational, it will also be disseminated by EUMETSAT (via EUMETCast, EUMETSAT Data Centre and potentially via CODA).

L2P Sea Level Anomaly from Sentinelle 3A cycles 12/13 (between Decembre 14th, 2016 and January 9th, 2017). Credits CLS/CNES/EUMETSAT.

 


 
AVISO+ Service Desk
Categories: Climate Science News

Jason-3's first birthday

AVISO Climate Change News - Tue, 2017-01-17 06:14
Launched one year ago on 17 January 2016, Jason-3 is operated by the NOAA in partnership with NASA, CNES and EUMETSAT. By succeeding TOPEX/Poseidon, Jason-1, and OSTM/Jason-2, Jason-3 extends the high precision altimetry data record to support climate monitoring, operational oceanography and seasonal forecasting. Launched in January 17th 2016, Jason-3 is operated by NOAA in partnership with NASA, CNES and EUMETSAT. After its launch, Jason-3 successfully reached its operational orbit where all the instruments were rapidly switched on. The first real-time Jason-3 data product was generated and compared with Jason-2, less than three days after launch. On June 2016, the Calibration/Validation results was discussed by the four partner agencies (CNES, NASA/JPL, EUMETSAT and NOAA) attended by the scientits. Consequenlty, the authorization was given to deliver the OGDR and IGDR products to all users. Since September 2016, the new mission Jason-3 integrates the Ssalto/Duacs multimission system for Level-3 and Level-4 products (in the new 4-satellite configuration: Jason-3, Jason-2 interleaved orbit, Saral/AltiKa and Cryosat-2). Jason-3 is now the reference mission used for the altimeter inter-calibration processing.  Early November, and following recommendations made by the OSTST Science Team in La Rochelle, the Jason-3 Joint Steering Group formally endorsed the dissemination of GDR to public.  Long life to Jason-3!

Near-Real-Time Along-track Absolute Dynamic Topography (in meters) seen by Jason-3 between 2017/01/07 and 2017/01/17, so during one cycle (10 days). This corresponds to the sea level height due to the ocean dynamics, i.e. the currents, variability, changes etc. They are the sum of the Sea level anomalies and the Mean Dynamic Topography. See the animation around the globe by clicking on the image or here. Credits CNES/CLS 2017, produced by Aviso+/DUACS.

 

Further information:
  • Missions: Jason-3
  • Data: 
    • Level-2: GDR, IGDR
    • Level-3: Along-track Absolute Dynamic Topography
    • Level-4: Gridded Absolute Dynamic Topography 
Categories: Climate Science News

Jason-3's first birthday

AVISO Climate Change News - Tue, 2017-01-17 06:14
Launched one year ago on 17 January 2016, Jason-3 is operated by the NOAA in partnership with NASA, CNES and EUMETSAT. By succeeding TOPEX/Poseidon, Jason-1, and OSTM/Jason-2, Jason-3 extends the high precision altimetry data record to support climate monitoring, operational oceanography and seasonal forecasting. Launched in January 17th 2016, Jason-3 is operated by NOAA in partnership with NASA, CNES and EUMETSAT. After its launch, Jason-3 successfully reached its operational orbit where all the instruments were rapidly switched on. The first real-time Jason-3 data product was generated and compared with Jason-2, less than three days after launch. On June 2016, the Calibration/Validation results was discussed by the four partner agencies (CNES, NASA/JPL, EUMETSAT and NOAA) attended by the scientits. Consequenlty, the authorization was given to deliver the OGDR and IGDR products to all users. Since September 2016, the new mission Jason-3 integrates the Ssalto/Duacs multimission system for Level-3 and Level-4 products (in the new 4-satellite configuration: Jason-3, Jason-2 interleaved orbit, Saral/AltiKa and Cryosat-2). Jason-3 is now the reference mission used for the altimeter inter-calibration processing.  Early November, and following recommendations made by the OSTST Science Team in La Rochelle, the Jason-3 Joint Steering Group formally endorsed the dissemination of GDR to public.  Long life to Jason-3!

Near-Real-Time Along-track Absolute Dynamic Topography (in meters) seen by Jason-3 between 2017/01/07 and 2017/01/17, so during one cycle (10 days). This corresponds to the sea level height due to the ocean dynamics, i.e. the currents, variability, changes etc. They are the sum of the Sea level anomalies and the Mean Dynamic Topography. See the animation around the globe by clicking on the image or here. Credits CNES/CLS 2017, produced by Aviso+/DUACS.

 

Further information:
  • Missions: Jason-3
  • Data: 
    • Level-2: GDR, IGDR
    • Level-3: Along-track Absolute Dynamic Topography
    • Level-4: Gridded Absolute Dynamic Topography 
Categories: Climate Science News

1-7 January 2017 week

AVISO Climate Change News - Thu, 2017-01-12 02:55
L'océan, la matrice du climat (Vendée globe, 2017/01/04)
Le changement climatique constitue une des plus grandes menaces pour la biodiversité (Actu-environnement, 2017/01/04)
Coup de chaud sur l’Arctique mais froid record en Sibérie ou en Amérique du Nord : des scientifiques pensent avoir détecté un nouveau schéma climatique là pour durer (Atlantico, 2016/12/27)
El Niño-La Niña: la fabrique des cyclones, déréglée par le changement climatique (Radio Australia, 2016/12/28)
Les records de chaleur ont encore été battus en 2016 (Le progrès, 2016/12/28)
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

1-7 January 2017 week

AVISO Climate Change News - Thu, 2017-01-12 02:55
L'océan, la matrice du climat (Vendée globe, 2017/01/04)
Le changement climatique constitue une des plus grandes menaces pour la biodiversité (Actu-environnement, 2017/01/04)
Coup de chaud sur l’Arctique mais froid record en Sibérie ou en Amérique du Nord : des scientifiques pensent avoir détecté un nouveau schéma climatique là pour durer (Atlantico, 2016/12/27)
El Niño-La Niña: la fabrique des cyclones, déréglée par le changement climatique (Radio Australia, 2016/12/28)
Les records de chaleur ont encore été battus en 2016 (Le progrès, 2016/12/28)
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

January 2017: Wave model with ice

AVISO Climate Change News - Mon, 2017-01-09 03:09
Wave models give better results when taking icebergs (detected by altimetry) into account.
Categories: Climate Science News
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