Carl-Fredrik Johannesson

Soil C storage and fluxes in forests and peatlands
In the process of converting to Bayesian statistics
PostDoc at Norwegian Institue for Nature Research (NINA)

[Carl-Fredrik Johannesson @CFJohannesson]

"Decadal decline in forest floor soil organic carbon after clear-cutting in Nordic and Canadian forests"
https://t.co/iLo1vAJuKd
Paper published!
28-35 years until minimum soil C stock is reached
More initial soil C --> more loss
Now follow me on BlueSky:
https://t.co/mAPUg8rHjy

[Carl-Fredrik Johannesson @CFJohannesson]

Lagom till våren har jag, tillsammans med Felicia Ransmark, släppt en barnbok med skogstema. Utgiven av @rabensjogren som vi haft förmånen att samarbeta med! In och ta er en titt, och vem vet, kanske vill ni köpa den?!
https://t.co/76HuV1YOQl

[Carl-Fredrik Johannesson @CFJohannesson]

If it wasn't for doing a PostDoc @NINAnature , I would be sure to apply for this one about forest soil C cycling:
https://t.co/iJ6hAi3whF

[Carl-Fredrik Johannesson @CFJohannesson]

@MauriceSundy @klausslar @JenniNorden Thank you! :)

[Carl-Fredrik Johannesson @CFJohannesson]

This is how happy you are when you've successfully defended your Ph.D. thesis!
Lots of people to thank of course, not least my supervisors @klausslar @JenniNorden and Hanna Silvennoinen. This would not have been possible without you!
Now onwards!

[Skogsstyrelsen @Skogsstyrelsen]

Avverkningsanmäld areal ökade med 42 % i december 2024 jämfört med 2023. I fjällnära skogar var arealen drygt åtta gånger större än samma månad förra året. #statistik L��s mer: https://t.co/ypNJzuOUmf

[Carl-Fredrik Johannesson @CFJohannesson]

@MauriceSundy Congratulations Sandy!! So cool! :)

[Carl-Fredrik Johannesson @CFJohannesson]

@klausslar @LICOR_ENV Love the coffee/tea in the snow pit!

[Klaus S. Larsen @klausslar]

Master's student Anna Rosendahl and myself visited drained and rewetted mires near Trysil to measure #CO2 #CH4 #N2O in the snow with @LICOR_ENV #LI7810 and #LI7820. Measured up to 16000 ppb CH4. Great data for her thesis :-)

[Carl-Fredrik Johannesson @CFJohannesson]

@MauriceSundy @LICOR_ENV @klausslar @JenniNorden @HolgerLange3 Thank you Sandy! One day before submission of PhD thesis, very good timing!

[Carl-Fredrik Johannesson @CFJohannesson]

GHG flux rate estimates substantially impacted by chamber closure period length, both linear and Hutchinson-Mosier based!
Fresh paper: https://t.co/eV5O9b5Neg
Effect largest in high flux regions.
Implications for all systems, but this analysis is based on set-up from @LICOR_ENV.

[Carl-Fredrik Johannesson @CFJohannesson]

@annvirkk Yupp! Thanks!

[Carl-Fredrik Johannesson @CFJohannesson]

@annvirkk I get "Page not found" when clicking the link. Interested in reading! :)

[Carl-Fredrik Johannesson @CFJohannesson]

By the way, I'm not disgusted by the person I'm talking to, I'm just not photogenique!

[Carl-Fredrik Johannesson @CFJohannesson]

Do you measure GHGs with non-steady-state chambers? How long do you keep your chamber closed? How long you keep it closed can substantially impact your flux estimates! Here presenting my work at #EGU2024. Keep an eye out on my twitter for a coming publication on the subject!

[Carl-Fredrik Johannesson @CFJohannesson]

@mdancho84 On the other hand, you could go Bayesian to avoid a black and white world (unless you think the world is functioning as black and white of course).

[Carl-Fredrik Johannesson @CFJohannesson]

@IvikaOstonen @JenniNorden "Only" approx. 2k observations post clear-cutting in forest floors and top mineral soil, approx. 1k in deeper mineral soil! But there's many more observations in total in the dataset (i.e. when including non-clear cuts)!

[Karelle Rheault @KarelleRheault]

Fellow GHG fluxes enthusiasts, I need your help 🙏
I just created a new R package, and I could really use some feedback!
Please try it out 👇
https://t.co/7VFbSEpKJg
Calculate GHG fluxes in R, from instruments such as LI-7810 from @LICOR_ENV and UGGA from @ABBgroupnews

[Klimatgranskaren @Klimatgranskarn]

Ulf Kristersson lovprisade Sveriges natur och de som gör den tillgänglig på instagram. Samtidigt genomför han en historiskt stor nedskärning på just skydd och skötsel av natur. https://t.co/QIxHfi64Ut