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Halldór

@halbjorns.bsky.social

130 followers 82 following 25 posts

Scientist at the Icelandic Meteorological Office. Climate, weather and volcanoes..... That about sums it up.....

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Reposted by Halldór

mystereclimat.bsky.social @mystereclimat.bsky.social · Aug 4

🌡Ce lundi, 106 stations en #Chine ont battu leurs records de températures minimales et maximales les plus élevées pour un mois d'août, dont 40 stations ont battu leur record absolu 🥵

Via compte X @yangyubin1998

Halldór @halbjorns.bsky.social · Aug 3

C4 plants are a different story, but there the benifits are only under drought stress
www.nature.com/articles/s43...

Climate change impacts on crop yields - Nature Reviews Earth & Environment

Warmer temperatures, increased CO2 concentrations and changing water availability affect cereal crop production. This Review examines changes in crop yield in response to these variables and discusses...

Halldór @halbjorns.bsky.social · Aug 3

A recent review by experts on the effect on C3 plants states:
" It seems that within the three factors related to climate change investigated, the rise in atmospheric [CO2] is possibly the one more detrimental and difficult to face ..."
scholar.google.com/scholar?hl=e...

scholar.google.com

Halldór @halbjorns.bsky.social · Aug 3

Among the authors there are no biologists or agricultural experts.
Yet they feel confident to claim that much of the knowledge on CO2 ferilization is wrong.
www.energy.gov/sites/defaul...

Halldór @halbjorns.bsky.social · May 7

Closing the lab will lead to more damages due to extreme weather at a time when vulnerability due to as well as the cost of extremes are rising. This makes no sense, and if this decision stands it will become a major problem for the US in years to come

Halldór @halbjorns.bsky.social · May 7

6)
The news that the US government intends to decimate GFDL for ideological reasons is scary. Weather facts are ideology independent. The weather doesn't care about your ideology, your belief system, - or even your existence. "It rains on the just as well as the unjust."

Halldór @halbjorns.bsky.social · May 7

5)
As an investment for the US government GFDL has paid many times over, with increased scientific knowledge and products (weather and climate models) that improve safety of the public and the economy.

Halldór @halbjorns.bsky.social · May 7

4) Professionally this was a very exciting time and an incredible environment to work in. The lab was extremely focused and the science was pursued with an admirable integrity.

Halldór @halbjorns.bsky.social · May 7

3) Others at GFDL were focused on atmospheric models, on climate model development, and there was a group developing the US hurricane model, - to name a few projects. Since I left they also developed the FV3 core which is the basis of the US weather forecasting model (GFS).

Halldór @halbjorns.bsky.social · May 7

2) I worked in the Ocean group using the groups models to pursue questions in oceanography about the large scale structure of the ocean. These questions relate to climate system dynamics and are of relevance for the stability of AMOC, inter-hemispheric linkages and future climate on the planet.

Halldór @halbjorns.bsky.social · May 7

1) I was employed by Princeton University from 98 to 2000 working at GFDL, a NOAA lab. GFDL has been a world leader in Climate modelling since the 1960s and Suki Manabe who lead the developement of their Climate Model was awarded the 2021 Nobel in Physics in recognition of his pioneering work..

Halldór @halbjorns.bsky.social · Apr 13

This was a shortlived La Nina....
www.facebook.com/share/v/1ADR...

www.facebook.com

Halldór @halbjorns.bsky.social · Mar 15

Nice day in the mountains

Halldór @halbjorns.bsky.social · Mar 3

Arctic seaice extent may have peaked. This would be an extremely low maximum. Let's wait for NSIDC statement.

Halldór @halbjorns.bsky.social · Mar 3

Mér sýnist að útbreiðsla hafís á Norðurslóðum hafa náð hámarki. Þetta verður þá eitthvert lægsta hámark sem vitað er um síðan mælingar hófust. NSIDC (nsidc.org/sea-ice-today) gefur vonandi út yfirlýsingu fljótlega (þó aðförin að loftslagsrannsóknum vestanhafs geti hugsanlega tafið)

Halldór @halbjorns.bsky.social · Mar 3

Mér sýnist að útbreiðsla hafís á Norðurslóðum hafa náð hámarki. Þetta verður þá eitthvert lægsta hámark sem vitað er um síðan mælingar hófust. NSIDC (nsidc.org/sea-ice-today) gefur vonandi út yfirlýsingu fljótlega (þó aðförin að loftslagsrannsóknum vestanhafs geti hugsanlega tafið)

Halldór @halbjorns.bsky.social · Mar 1

Elin few days ago on the BBC

Halldór @halbjorns.bsky.social · Mar 1

www.ruv.is/frettir/menn...

Elín Hall frumflutti nýtt efni á ensku í stærsta útvarpsþætti Evrópu - RÚV.is

Elín Hall kom fram fyrir hönd Rásar 2 í stærsta útvarpsþætti Evrópu, Europe's Biggest Gig, í vikunni. Þátturinn var sendur út á fimm ríkisútvarpsstöðvum í Evrópu.

Halldór @halbjorns.bsky.social · Jan 27

Ég held með sandsílinu!

Halldór @halbjorns.bsky.social · Nov 21

10 eruptions in Reykjanesskagi since March 2021. I have had to fly into 8 of them. This one is a medium size one for this sequence, not as big as the last two, but big enough.....

Halldór @halbjorns.bsky.social · Nov 21

Night time work. ....

Halldór @halbjorns.bsky.social · Nov 19

Later is too late
youtu.be/tEU43KBH6U8?...

Later Is Too Late To Act On Climate Change

YouTube video by Science Moms

Halldór @halbjorns.bsky.social · Nov 19

1.5 is dead. Long live 1.5.....
www.theguardian.com/environment/...

World’s 1.5C climate target ‘deader than a doornail’, experts say

Scientists say goal to keep world’s temperature rise below 1.5C is not going to happen despite talks at Cop29 in Baku

www.theguardian.com

Halldór @halbjorns.bsky.social · Nov 17

The US Mexico wall is focussing on the symptoms but not the cause....
"These findings underscore the importance of recognizing weather-driven mobility, which can increase with anthropogenic climate change."
www.pnas.org/doi/10.1073/...

Weather deviations linked to undocumented migration and return between Mexico and the United States | PNAS

As the world’s climate continues to change, human populations are exposed to increasingly severe and extreme weather conditions that can promote mi...

Halldór @halbjorns.bsky.social · Nov 17

Bæði þessi atriði skipta miklu fyrir loftslagsmarkmið. Án þess að tryggt sé að virkjun til orkuskipta rati í orkuskipti nást loftslagsmarkmið ekki. Án þess að réttindi almennings séu tryggð eru réttlát umskipti í hættu og þarmeð stuðningur við aðgerðir. Það fara 5% raforkunnar til almennings.

Halldór @halbjorns.bsky.social · Nov 17

www.visir.is/g/2024265086...

1. Engin trygging fyrir að innlend orka "sé nýtt í þágu almennings, frekar en að lúta markaðslögmálum" - Sambærileg óvissa veldur úlfúð í nágrannalöndum.
2. Engin trygging fyrir því að ný uppbygging "rati í þau verkefni sem sagt er að eigi að virkja fyrir."

„Hvenær var þetta samtal við þjóðina tekið?“ spurði garðyrkjubóndinn - Vísir

Í vikunni heimsótti ég garðyrkjubændur á Suðurlandi. Úti var dimmur nóvember og veturinn minnti á sig með ísköldum vindkviðum, en inni í gróðurhúsunum ríkti hlýja og birta. Þar var lífið fullt af litu...