Andrew MacDougall
@ahmacdougall.bsky.social
Canadian Climate Scientist from Nova Scotia, specializing in Zero Emissions Commitment, carbon budgets, permafrost carbon, and biogeochemical feedbacks to climate change.
How Dry is it in Nova Scotia? Did a quick analysis of the longest established local weather station.
It is the driest since summer of 1975. Interestingly dry summers were common in the early 20th century, but have now all but slipped out of living memory. #NovaScotia #AtlanticCanada
It is the driest since summer of 1975. Interestingly dry summers were common in the early 20th century, but have now all but slipped out of living memory. #NovaScotia #AtlanticCanada
August 14, 2025 at 5:37 PM
How Dry is it in Nova Scotia? Did a quick analysis of the longest established local weather station.
It is the driest since summer of 1975. Interestingly dry summers were common in the early 20th century, but have now all but slipped out of living memory. #NovaScotia #AtlanticCanada
It is the driest since summer of 1975. Interestingly dry summers were common in the early 20th century, but have now all but slipped out of living memory. #NovaScotia #AtlanticCanada
Glaciologically the best window to skirt along the coast of the Cordilleran Ice Sheet before 16ka was ~42ka, with a second more harrowing window ~35ka.
tc.copernicus.org/articles/10/...
tc.copernicus.org/articles/10/...
June 26, 2025 at 10:58 PM
Glaciologically the best window to skirt along the coast of the Cordilleran Ice Sheet before 16ka was ~42ka, with a second more harrowing window ~35ka.
tc.copernicus.org/articles/10/...
tc.copernicus.org/articles/10/...
2) CO2 emissions are still growing but at a much slower rate that in previous decades.
June 22, 2025 at 10:50 PM
2) CO2 emissions are still growing but at a much slower rate that in previous decades.
1) Rate of atm CO2 rise is actually still increasing. So the 1st derivative of the Keeling curve is still growing. There has been no progress for any derivative for CO2 concentration.
June 22, 2025 at 10:50 PM
1) Rate of atm CO2 rise is actually still increasing. So the 1st derivative of the Keeling curve is still growing. There has been no progress for any derivative for CO2 concentration.
In what is likely to be one of the hardest science communication problems in history Earth System Models show that CO2 concentration is expected to fall 1 to 2 decades before net-zero.
iopscience.iop.org/article/10.1...
iopscience.iop.org/article/10.1...
May 24, 2025 at 12:01 AM
In what is likely to be one of the hardest science communication problems in history Earth System Models show that CO2 concentration is expected to fall 1 to 2 decades before net-zero.
iopscience.iop.org/article/10.1...
iopscience.iop.org/article/10.1...
For those curious Election Canada seat allocation table below:
May 5, 2025 at 11:28 PM
For those curious Election Canada seat allocation table below:
April 20, 2025 at 12:31 PM
That was a popular idea 25 years ago. But apparently has been pretty throughly refuted. Well outside my area of expertise.
en.wikipedia.org/wiki/Populat...
en.wikipedia.org/wiki/Populat...
April 18, 2025 at 12:22 PM
That was a popular idea 25 years ago. But apparently has been pretty throughly refuted. Well outside my area of expertise.
en.wikipedia.org/wiki/Populat...
en.wikipedia.org/wiki/Populat...
April 7, 2025 at 11:18 PM
Antigonish, 7:00am
March 27, 2025 at 11:05 AM
Antigonish, 7:00am
The authors of the study attribute the deforestation to the spread of agricultural.
December 23, 2024 at 5:17 PM
The authors of the study attribute the deforestation to the spread of agricultural.
In some simulations it is unclear if warming has stopped (with greater than 95% certainty) even by the beginning of the 24th century.
June 24, 2024 at 1:55 PM
In some simulations it is unclear if warming has stopped (with greater than 95% certainty) even by the beginning of the 24th century.
Results warming slowdown: We estimate that it will take 40 to 60 years after a slowdown in warming rate, to robustly detect the signal in the global average temperature record.
June 24, 2024 at 1:53 PM
Results warming slowdown: We estimate that it will take 40 to 60 years after a slowdown in warming rate, to robustly detect the signal in the global average temperature record.
Eby et al 2009?
March 28, 2024 at 11:34 PM
Eby et al 2009?