Notices by Zack Labe (zlabe@fediscience.org), page 2

Last month observed highly anomalous temperatures across nearly all of #Antarctica - departures exceeding 5°C above/below the 1981-2010 reference period...

Data from ECMWF ERA5 reanalysis at https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=overview

Last month was the most anomalous on record for temperatures in the Southern Hemisphere...

Data from ECMWF ERA5 reanalysis at https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=overview

Above average temperatures continued across the entire northern half of the Atlantic Ocean during September 2023. Temperatures were also anomalously warm over much of North and South America. The El Niño is of course striking too.

Data from ERA5 reanalysis at https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=overview.

Hope you had a good weekend! Here's your Monday ice update - #Arctic sea ice extent is currently the 5th lowest on record (JAXA data)...

• about 380,000 km² below the 2010s mean
• about 1,510,000 km² below the 2000s mean
• about 2,640,000 km² below the 1990s mean
• about 3,300,000 km² below the 1980s mean

Additional plots: https://zacklabe.com/arctic-sea-ice-figures/

Oh look, another absurd climate graph from this summer - sea surface temperature anomalies in the North Atlantic for every August since 1854... 🥴

Data available from NOAA ERSSTv5 (https://psl.noaa.gov/data/gridded/data.noaa.ersst.v5.html).

⬇️ September brings an end to the melt season in the #Arctic as sea ice reaches its minimum extent by the middle of the month.

This thread shares an overview of its long-term trends in the atmosphere and ocean. #ArcticAmplification

Trends in September #Arctic sea ice thickness over approximately the last four decades (yes, that shows thinning everywhere)... 🧊📉

[Data from PIOMAS. For more information: https://doi.org/10.1175/JCLI-D-17-0436.1]

September also observes the largest losses of #Arctic sea ice concentration compared to any other month of the year. And NO increases. The largest declines are in parts of the Chukchi & Beaufort Seas.

[Sea ice concentration = fraction of ice-cover. More info: https://doi.org/10.1175/BAMS-D-23-0079.1]

Each line represents one year of #Arctic sea ice volume from 1979 [dark blue] to 2022 [dark red]. This year is shown in yellow - now updated through all of August 2023

+ More visuals of ice thickness: https://zacklabe.com/arctic-sea-ice-volumethickness/

Working on a public talk about climate change impacts in the United States and thought I would share one of my slides - always a striking comparison...

[Data from https://data.giss.nasa.gov/gistemp/. As usual, the rest of my slides will be available on my website by next week.]

@santiago 2012 also observed the lowest extent of sea ice on record for the entire Arctic.

Sea ice across the Pacific side of the #Arctic has now dropped to the 2nd lowest on record in at least the satellite-era. This is a lot of open water.

Compare 2023 compare with the purple lines (1980s)...

Map of Arctic: https://zacklabe.files.wordpress.com/2022/08/b203f-nsidc_mapseas.png. Data: https://nsidc.org/data/seaice_index.

Global temperature anomalies by month through July 2023. Every month so far this year has been ≥0.87°C above the 1951-1980 climate baseline.

Note: M = sunspot cycle max, m = sunspot cycle min, V = volcano

[Data from NASA GISTEMPv4. Visualization prepared by http://columbia.edu/~mhs119/Temperature/T_moreFigs/]

Arctic sea ice grows and shrinks during the year (seasonal cycle). It reaches its annual minimum extent at the end of every summer (early-mid September).

Currently, 2023's sea ice extent is already below the minimums from the 1980, 1990, and 2000 decadal averages [JAXA data]

@santiago No.

Enjoy your weekend! Here's your Friday ice update - #Arctic sea ice extent is currently the 8th lowest on record (JAXA data)...

• about 20,000 km² above the 2010s mean
• about 1,000,000 km² below the 2000s mean
• about 1,940,000 km² below the 1990s mean
• about 2,570,000 km² below the 1980s mean

Other polar plots: https://zacklabe.com/arctic-sea-ice-figures/

The rate of #Antarctic sea ice growth has slowed down even more in the last few days...

More visualizations at: https://zacklabe.com/antarctic-sea-ice-extentconcentration/. More information on this extreme event at: https://zacklabe.com/climate-viz-of-the-month/ and https://youtube.com/watch?v=ZFHKZMprEOU&t=1s&ab_channel=DrGilbz.

Uh, yeah, this is still happening...

For more visualizations of the historic lack of sea ice in the #Antarctic (during July): https://zacklabe.com/antarctic-sea-ice-extentconcentration/.

With ice growth remaining slow, the record #Antarctic sea ice anomaly (negative departure from average) continues to somehow get larger in size...

Seasonal cycle graphs at https://zacklabe.com/antarctic-sea-ice-extentconcentration/. More info at http://nsidc.org/arcticseaicenews/2023/07/mid-summer-bliss/.

Well, the absolute magnitude of the #Antarctic sea ice anomaly has now tied the largest on record...

More graphs here: https://zacklabe.com/antarctic-sea-ice-extentconcentration/.

Note that while sea ice is growing (austral winter), it's happening much slower than typical.

I am using the National Snow and Ice Data Center (NSIDC) 5-day running mean (https://nsidc.org/data/seaice_index/faq). Data from https://nsidc.org/data/seaice_index.