Millennium-scale evolution of the Atlantic Meridional Overturning Circulation (AMOC), 400 - 2020. SST-based AMOC reconstructions (light and dark blue) compared to various proxy reconstructions, including land and sea surface temperature reconstructions, sortable silt data, δ18O in benthic foraminifera, δ15N of deep-sea gorgonian corals, and relative abundance of Turborotalita quinqueloba. Since at least 400 AD relatively stable, the AMOC began to decline during the 19th Century which is evident in all proxy records. Around 1950 a phase of particularly rapid decline started that is found in several, largely independent proxies. A short-lived recovery is evident in the 1990s before a return to decline from the mid-2000s. Together these data consistently show that the modern AMOC slowdown is unprecedented in over a thousand years. Graphic: Levke Caesar

Gulf Stream System at its weakest in more than a millennium – “This could bring us dangerously close to the tipping point at which the flow becomes unstable”

25 February 2021 (PIK) – Never before in over 1000 years the Atlantic Meridional Overturning Circulation (AMOC), also known as Gulf Stream System, has been as weak as in the last decades. This is the result of a new study by scientists from Ireland, Britain, and Germany. The researchers compiled so-called proxy data – taken […]

Observed sea-level rise in Rockport, Texas, 1969-2020 and projected to 2050. Rockport has the second-highest annual rise rate (7.1 mm/year in 2020), and the highest projected sea-level rise for 2050 at 0.82 meters (2.69 ft) above mean sea level in 1992. Graphic: VIMS

U.S. sea-level report cards: 2020 again trends toward acceleration – Water levels at 26 of 32 stations rose at higher rate than in 2019

By David Malmquist 24 January 2021 (VIMS) – Sea level “report cards” issued annually by researchers at William & Mary’s Virginia Institute of Marine Science add further evidence of an accelerating rate of sea-level rise during 2020 at nearly all tidal stations along the U.S. coastline. The team’s web-based report cards project sea level to […]

This frame grab from video provided by KK Productions shows a massive flood of water, mud, and debris flowing in the Chamoli District after a portion of the Nanda Devi glacier broke off in the Tapovan area of the northern state of Uttarakhand, India, Sunday, 7 February 2021. Photo: KK Productions / AP

Rescuers search for 171 missing people after Indian glacier causes devastating flood – “Most scholars of Himalayan rivers have been warning about these risks for decades”

By Hannah Ellis-Petersen 8 February 2021 DELHI, India (The Guardian) – Twenty six bodies have been recovered in the Indian Himalayas and scores more people are still missing after a second day of rescue efforts after a glacier break that caused an avalanche of water and debris to engulf a river valley and demolish two […]

Map showing the age of sea ice in the Arctic at winter maximum in 2000 (left, week of March 18) and 2020 (right, week of March 21). Ice older than 5 years (white) is very rare today; only a small ribbon remains along the islands of the Canadian Arctic. Age is a stand-in for ice thickness and durability; young ice is thinner and more likely to melt in the summer. NOAA Climate.gov map, based on data from the National Snow and Ice Data Center. Graphic: NOAA

Sea ice loss and extreme wildfires mark another year of Arctic change – “The transformation of the Arctic to a warmer, less frozen, and biologically changed region is well underway”

8 December 2020 (NOAA) – NOAA’s 15th Arctic Report Card catalogs for 2020 the numerous ways that climate change continues to disrupt the polar region, with second-highest air temperatures and second-lowest summer sea ice driving a cascade of impacts, including the loss of snow and extraordinary wildfires in northern Russia. The Arctic Report Card is […]

Radar images from the Sentinel-1 satellite of the Milne Ice Shelf breakup at the end of July 2020. Photo: Dr. Adrienne White / Canadian Ice Service

Canada’s last fully intact Arctic ice shelf collapses – “This was the largest remaining intact ice shelf, and it’s disintegrated, basically”

By Moira Warburton 6 August 2020 (Reuters) – The last fully intact ice shelf in the Canadian Arctic has collapsed, losing more than 40% of its area in just two days at the end of July, researchers said on Thursday. The Milne Ice Shelf is at the fringe of Ellesmere Island, in the sparsely populated […]

Arctic temperature departures from average for 21 June 2020, showing extreme temperatures in Siberia and parts of Canada. The northeastern Siberian town of Verkhoyansk is likely to have set a record for the highest temperature documented in the Arctic Circle, with a reading of 100.4 degrees (38 Celsius) recorded Saturday, 20 June 2020. Graphic: Climate Reanalyzer

Hottest Arctic temperature record probably set with 100-degree reading in Siberia

By Andrew Freedman 21 June 2020 (The Washington Post) – A northeastern Siberian town is likely to have set a record for the highest temperature documented in the Arctic Circle, with a reading of 100.4 degrees (38 Celsius) recorded Saturday in Verkhoyansk, north of the Arctic Circle and about 3,000 miles east of Moscow. Records […]

Map showing surface air temperature anomaly for May 2020 relative to the May average for the period 1981-2010. May 2020 was the hottest May on record. Data: ERA5. Graphic: Copernicus Climate Change Service / ECMWF

May 2020 was hottest May on record – “The really large anomalies started during January, and since then this signal has been quite persistent”

By Kelly Macnamara and Marlowe Hood 5 June 2020 PARIS (AFP) – Temperatures soared 10 degrees Celsius above average last month in Siberia, home to much of Earth’s permafrost, as the world experienced its warmest May on record, the European Union’s climate monitoring network said Friday. Large swathes of Siberia have been unusually warm for […]

Surface air temperature anomaly for February 2020 relative to the average for the period 1981-2010. Data: ERA5. Graphic: Copernicus Climate Change Service / ECMWF

The boreal winter season 19/20 was by far the warmest winter season ever recorded in Europe – “Europe has been experiencing its mildest winter on record”

4 March 2020 (C3S) – With persistent mild weather over Europe, particularly in the north and east, the past winter was 3.4 °C warmer than the average winter for the period 1981-2010. The temperature was almost 1.4°C higher than that of the previous warmest winter, 2015/16. Back in November C3S seasonal predictions provided strong indications […]

Chairlifts are pictured over ski slopes closed due to lack of snow, at the ski resort of The Mourtis in Boutx, France, 10 February 2020. Photo: Regis Duvignau / REUTERS

The ski resort with no snow contemplates a warmer future – “If the snow is not there, we have to sell something else”

By Regis Duvignau and Antony Paone 12 February 2020 LE MOURTIS, France (Reuters) – This year’s winter in France has, so far, been the mildest in more than a century, and that has had a direct impact on the ski resort of Le Mourtis, in the Pyrenees mountains. “There’s no snow,” said French holidaymaker Frederic […]

Map showing land and ocean global temperature percentiles and departures from average for January 2020. The January 2020 global land and ocean surface temperature was the highest in the 141-year record at 2.05°F (1.14°C) above the 20th century average of 53.6°F (12.0°C). This value surpassed the previous record set in 2016 by only 0.04°F (0.02°C). Graphic: NOAA / NCEI

January 2020 was the warmest January on record for the globe

13 February 2020 (NCEI) – The globally averaged temperature departure from average over land and ocean surfaces for January 2020 was the highest for the month of January in the 141-year NOAA global temperature dataset record, which dates back to 1880. This monthly summary, developed by scientists at NOAA National Centers for Environmental Information, is […]

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