Alf Norkko
@alfnorkko.bsky.social
Marine ecologist. Prof at Tvärminne Zoological Station, University of Helsinki and at www.coastclim.org
Reposted by Alf Norkko
🚨 New publication!! 🚨
Read the review paper by Lydia White & @alfnorkko.bsky.social, on how to experimentally assess carbon sequestration potential of macroalgae.
doi.org/10.1111/1365...
Read the review paper by Lydia White & @alfnorkko.bsky.social, on how to experimentally assess carbon sequestration potential of macroalgae.
doi.org/10.1111/1365...
A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae
We systematically reviewed literature on macroalgal degradation. To date, most degradation experiments are carried out in aquaria or shallow environments, span short timescales or rarely incorporate ...
doi.org
August 15, 2025 at 9:24 AM
🚨 New publication!! 🚨
Read the review paper by Lydia White & @alfnorkko.bsky.social, on how to experimentally assess carbon sequestration potential of macroalgae.
doi.org/10.1111/1365...
Read the review paper by Lydia White & @alfnorkko.bsky.social, on how to experimentally assess carbon sequestration potential of macroalgae.
doi.org/10.1111/1365...
Reposted by Alf Norkko
This review clearly shows that macroalgal decomposition rates vary significantly between experimental approaches and are severely underestimated when a refractory pool is not considered, impacting scaled-up estimates of macroalgal carbon export to the deep ocean 🌊🌱
Check out our new review paper, championed by Lydia White, "A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae". Read it here: besjournals.onlinelibrary.wiley.com/doi/10.1111/... @coastclim.bsky.social @tvarminne.bsky.social #mCDR
A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae
We systematically reviewed literature on macroalgal degradation. To date, most degradation experiments are carried out in aquaria or shallow environments, span short timescales or rarely incorporate ....
besjournals.onlinelibrary.wiley.com
August 12, 2025 at 7:29 PM
This review clearly shows that macroalgal decomposition rates vary significantly between experimental approaches and are severely underestimated when a refractory pool is not considered, impacting scaled-up estimates of macroalgal carbon export to the deep ocean 🌊🌱
Check out our new review paper, championed by Lydia White, "A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae". Read it here: besjournals.onlinelibrary.wiley.com/doi/10.1111/... @coastclim.bsky.social @tvarminne.bsky.social #mCDR
A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae
We systematically reviewed literature on macroalgal degradation. To date, most degradation experiments are carried out in aquaria or shallow environments, span short timescales or rarely incorporate ....
besjournals.onlinelibrary.wiley.com
August 11, 2025 at 8:41 PM
Check out our new review paper, championed by Lydia White, "A path towards appropriate degradation experiments for assessing carbon sequestration potential of macroalgae". Read it here: besjournals.onlinelibrary.wiley.com/doi/10.1111/... @coastclim.bsky.social @tvarminne.bsky.social #mCDR
Reposted by Alf Norkko
Southern Ocean circulation reversal may have already happened. This is a surprise and scary stuff.
theconversation.com/completely-u...
theconversation.com/completely-u...
‘Completely unexpected’: Antarctic sea ice may be in terminal decline due to rising Southern Ocean salinity
Scientists once thought Antarctica might hold onto its sea ice as the world warmed. No longer.
theconversation.com
July 5, 2025 at 6:16 AM
Southern Ocean circulation reversal may have already happened. This is a surprise and scary stuff.
theconversation.com/completely-u...
theconversation.com/completely-u...
New paper championed by Rebecca Gladstone-Gallagher et al for kids (with kids as reviewers) on the importance of connecting across ecosystems and human values
@tvarminne.bsky.social
@helsinki.fi
@aucklanduni.bsky.social
@coastclim.bsky.social
kids.frontiersin.org/articles/10....
@tvarminne.bsky.social
@helsinki.fi
@aucklanduni.bsky.social
@coastclim.bsky.social
kids.frontiersin.org/articles/10....
Water Flows Downhill: How Looking “Upstream” Can Help Maintain A Healthy Sea
Our planet is in trouble. We are losing plants, animals, and habitats, and the processes that link them are changing. Nature is becoming sick. People have been trying to fix this problem, but the situ...
kids.frontiersin.org
June 16, 2025 at 9:51 AM
New paper championed by Rebecca Gladstone-Gallagher et al for kids (with kids as reviewers) on the importance of connecting across ecosystems and human values
@tvarminne.bsky.social
@helsinki.fi
@aucklanduni.bsky.social
@coastclim.bsky.social
kids.frontiersin.org/articles/10....
@tvarminne.bsky.social
@helsinki.fi
@aucklanduni.bsky.social
@coastclim.bsky.social
kids.frontiersin.org/articles/10....
Reposted by Alf Norkko
Ekologisk hållbarhet är en förutsättning för både ekonomiska och sociala värden – och måste sättas främst också i det kortsiktiga beslutsfattandet. Läs uppmaningen från @alfnorkko.bsky.social & Christoph Humborg @coastclim.bsky.social i @hbl.fi, med anledning av den pågående havskonferensen.
DEBATT: Finland och Sverige måste sätta ett friskt hav främst
Ekologisk hållbarhet är en förutsättning för ekonomiska och sociala värden i haven, skriver Alf Norkko och Christoph…
www.hbl.fi
June 10, 2025 at 12:07 PM
Ekologisk hållbarhet är en förutsättning för både ekonomiska och sociala värden – och måste sättas främst också i det kortsiktiga beslutsfattandet. Läs uppmaningen från @alfnorkko.bsky.social & Christoph Humborg @coastclim.bsky.social i @hbl.fi, med anledning av den pågående havskonferensen.
Det är dags för Finland och Sverige att ta FNs havskonferens på allvar! @tvarminne.bsky.social @ostersjocentrum.bsky.social @coastclim.bsky.social @balticseacentre.bsky.social @helsinki.fi
www.hbl.fi/2025-06-07/f...
www.hbl.fi/2025-06-07/f...
DEBATT: Finland och Sverige måste sätta ett friskt hav främst
Ekologisk hållbarhet är en förutsättning för ekonomiska och sociala värden i haven, skriver Alf Norkko och Christoph…
www.hbl.fi
June 7, 2025 at 6:28 AM
Det är dags för Finland och Sverige att ta FNs havskonferens på allvar! @tvarminne.bsky.social @ostersjocentrum.bsky.social @coastclim.bsky.social @balticseacentre.bsky.social @helsinki.fi
www.hbl.fi/2025-06-07/f...
www.hbl.fi/2025-06-07/f...
New paper: Marine biodiversity is declining across Finnish coastal waters, with loss driven by eutrophication, climate change & seabed disturbance. Urgent action, better monitoring & bridging knowledge gaps are key to ecosystem recovery. #Biodiversity #BalticSea
link.springer.com/article/10.1...
link.springer.com/article/10.1...
Marine biodiversity loss in Finnish coastal waters: Evidence and implications for management - Ambio
Marine biodiversity loss poses significant ecological and socio-economic challenges. This paper examines how coastal biodiversity loss is expressed and outlines implications for management. Synthesizi...
link.springer.com
May 18, 2025 at 6:25 PM
New paper: Marine biodiversity is declining across Finnish coastal waters, with loss driven by eutrophication, climate change & seabed disturbance. Urgent action, better monitoring & bridging knowledge gaps are key to ecosystem recovery. #Biodiversity #BalticSea
link.springer.com/article/10.1...
link.springer.com/article/10.1...
Reposted by Alf Norkko
🚨 NEW paper alert!
#Seagrass #functional #traits act as predictors of #biomass, albeit moderately. Study conducted across 1500 km coastline.
Main #biodiversity mechanism driving seagrass #biomass stock is through dominance.
@tvarminne.bsky.social @uwaoceans.bsky.social
doi.org/10.1111/1365...
#Seagrass #functional #traits act as predictors of #biomass, albeit moderately. Study conducted across 1500 km coastline.
Main #biodiversity mechanism driving seagrass #biomass stock is through dominance.
@tvarminne.bsky.social @uwaoceans.bsky.social
doi.org/10.1111/1365...
Functional traits are moderate predictors of above‐ and below‐ground biomass in multispecies seagrass habitats
Read the free Plain Language Summary for this article on the Journal blog.
doi.org
April 28, 2025 at 6:10 PM
🚨 NEW paper alert!
#Seagrass #functional #traits act as predictors of #biomass, albeit moderately. Study conducted across 1500 km coastline.
Main #biodiversity mechanism driving seagrass #biomass stock is through dominance.
@tvarminne.bsky.social @uwaoceans.bsky.social
doi.org/10.1111/1365...
#Seagrass #functional #traits act as predictors of #biomass, albeit moderately. Study conducted across 1500 km coastline.
Main #biodiversity mechanism driving seagrass #biomass stock is through dominance.
@tvarminne.bsky.social @uwaoceans.bsky.social
doi.org/10.1111/1365...
Reposted by Alf Norkko
It's gettin hot in here...
My postdoc advisor, Wally Broecker, said: "Climate is an angry beast, and we are poking it with sticks." Well, we are getting to the FOFO stage. 🧪 www.esa.int/Applications...
Sea surface warming faster than expected
Satellite observations show that sea-surface temperatures over the past four decades have been getting warmer at an accelerated pace.
www.esa.int
April 28, 2025 at 6:33 AM
It's gettin hot in here...
Check out our new paper on experimental manipulations in situ of #marine #heatwaves championed by @aquanorman.bsky.social & Laura Kauppi @joannanorkko.bsky.social @coastclim.bsky.social @tvarminne.bsky.social @helsinki.fi
🌊Published🌊
Hot water, busy seafloor: How #marine #heatwaves amplify nutrient cycling
@alfnorkko.bsky.social 🌎🧪
Hot water, busy seafloor: How #marine #heatwaves amplify nutrient cycling
@alfnorkko.bsky.social 🌎🧪
Hot Water, Busy Seafloor: How Marine Heatwaves Amplify Nutrient Cycling
Norman Göbeler, Laura Kauppi, Alf Norkko, Joanna Norkko. This is a plain language summary of a Functional Ecology article which can be found here. Marine heatwaves—periods of abnormally high water …
fesummaries.wordpress.com
March 28, 2025 at 1:17 PM
Check out our new paper on experimental manipulations in situ of #marine #heatwaves championed by @aquanorman.bsky.social & Laura Kauppi @joannanorkko.bsky.social @coastclim.bsky.social @tvarminne.bsky.social @helsinki.fi
Reposted by Alf Norkko
Also check out our summary blog: “Hot Water, Busy Seafloor: How Marine Heatwaves Amplify Nutrient Cycling”
fesummaries.wordpress.com/2025/03/07/h...
Laura Kauppi, @alfnorkko.bsky.social, @joannanorkko.bsky.social, Nottbeck Foundation, Roth Finland Oy, @coastclim.bsky.social, @tvarminne.bsky.social
fesummaries.wordpress.com/2025/03/07/h...
Laura Kauppi, @alfnorkko.bsky.social, @joannanorkko.bsky.social, Nottbeck Foundation, Roth Finland Oy, @coastclim.bsky.social, @tvarminne.bsky.social
Hot Water, Busy Seafloor: How Marine Heatwaves Amplify Nutrient Cycling
Norman Göbeler, Laura Kauppi, Alf Norkko, Joanna Norkko. This is a plain language summary of a Functional Ecology article which can be found here. Marine heatwaves—periods of abnormally high water …
fesummaries.wordpress.com
March 28, 2025 at 11:18 AM
Also check out our summary blog: “Hot Water, Busy Seafloor: How Marine Heatwaves Amplify Nutrient Cycling”
fesummaries.wordpress.com/2025/03/07/h...
Laura Kauppi, @alfnorkko.bsky.social, @joannanorkko.bsky.social, Nottbeck Foundation, Roth Finland Oy, @coastclim.bsky.social, @tvarminne.bsky.social
fesummaries.wordpress.com/2025/03/07/h...
Laura Kauppi, @alfnorkko.bsky.social, @joannanorkko.bsky.social, Nottbeck Foundation, Roth Finland Oy, @coastclim.bsky.social, @tvarminne.bsky.social
Reposted by Alf Norkko
Are the Oceans Reaching Their Limit? Join the Discussion at #ACCCImpactWeek on April 22. Top researchers from CoastClim participate @alfnorkko.bsky.social and Anna Villnäs. Register by April 9, the event is free of charge.
March 25, 2025 at 9:48 AM
Are the Oceans Reaching Their Limit? Join the Discussion at #ACCCImpactWeek on April 22. Top researchers from CoastClim participate @alfnorkko.bsky.social and Anna Villnäs. Register by April 9, the event is free of charge.
Check out this BBC story, covering our first Polar scientific diving course run by Edd Stockdale at the Finnish Scientific Diving Academy in 2024, building capacity for collecting data to understand rapid changes in polar regions. @tvarminne.bsky.social @helsinki.fi
www.bbc.com/future/artic...
www.bbc.com/future/artic...
'You look up and see light coming through': The divers venturing under the ice in the name of science
It is a world cut off from our own by thick blankets of floating ice, but some scientists are taking the plunge to learn how these frozen depths are changing.
www.bbc.com
March 13, 2025 at 8:17 AM
Check out this BBC story, covering our first Polar scientific diving course run by Edd Stockdale at the Finnish Scientific Diving Academy in 2024, building capacity for collecting data to understand rapid changes in polar regions. @tvarminne.bsky.social @helsinki.fi
www.bbc.com/future/artic...
www.bbc.com/future/artic...
Reposted by Alf Norkko
Read a news article written by our New Zealand collaborator Prof. Simon Thrush. He writes about the importance of the findings from the joint CoastClim- @aucklanduni.bsky.social field campaign that was conducted earlier this year.
NZ hopes to store carbon in marine ecosystems – but some are so degraded they’re already a source of emissions
Seagrass meadows, mangroves and kelp forests are carbon sinks. Restoring or protecting them addresses both biodiversity loss and the climate crisis.
theconversation.com
March 4, 2025 at 8:24 AM
Read a news article written by our New Zealand collaborator Prof. Simon Thrush. He writes about the importance of the findings from the joint CoastClim- @aucklanduni.bsky.social field campaign that was conducted earlier this year.
How often do we explore temporal context dependece in ecological pattern and process? Not nearly enough!
Coastal ecosystem functions depend on biodiversity—but temporal context shapes how benthic species influence solute fluxes, with effects varying by season, species & site. Timing is key!
Coastal ecosystem functions depend on biodiversity—but temporal context shapes how benthic species influence solute fluxes, with effects varying by season, species & site. Timing is key!
New publication! Gammal et al. sampled benthic macrofauna, solute fluxes and environmental variables at 3 shallow habitats throughout one year.
Results show that the strength of biodiversity-function relationships really depends on which species are present in which habitat and during which season.
Results show that the strength of biodiversity-function relationships really depends on which species are present in which habitat and during which season.
Seasonal Variation in the Role of Benthic Macrofauna Communities for Ecosystem Functioning in Shallow Coastal Soft-Sediment Habitats - Estuaries and Coasts
Coastal zones include a variety of habitats and numerous biodiversity components, which provide essential ecosystem functions and services. In the wake of the escalating climate and biodiversity crise...
doi.org
February 17, 2025 at 9:22 PM
How often do we explore temporal context dependece in ecological pattern and process? Not nearly enough!
Coastal ecosystem functions depend on biodiversity—but temporal context shapes how benthic species influence solute fluxes, with effects varying by season, species & site. Timing is key!
Coastal ecosystem functions depend on biodiversity—but temporal context shapes how benthic species influence solute fluxes, with effects varying by season, species & site. Timing is key!
Reposted by Alf Norkko
Finally in my hands! Graduated with distinction!🎓🌊🎉 Huge thanks to @dansmale1.bsky.social for an engaging defense discussion, my supervisors J. Norkko and @alfnorkko.bsky.social, and colleagues and supporters NottbeckFdn @coastclim.bsky.social RothFinland.
Link to thesis: hdl.handle.net/10138/587464
Link to thesis: hdl.handle.net/10138/587464
February 13, 2025 at 1:58 PM
Finally in my hands! Graduated with distinction!🎓🌊🎉 Huge thanks to @dansmale1.bsky.social for an engaging defense discussion, my supervisors J. Norkko and @alfnorkko.bsky.social, and colleagues and supporters NottbeckFdn @coastclim.bsky.social RothFinland.
Link to thesis: hdl.handle.net/10138/587464
Link to thesis: hdl.handle.net/10138/587464
Looking for a PhD student to join us - focusing on quantifying GHG across coastal seascapes. Please help spread the word!
👉Open PhD position!
in pelagic biogeochemistry @tvarminne.bsky.social @helsinkiuni.bsky.social
Interested in investigating temporal and spatial variability in coastal sea-air GHG fluxes, impacts of heatwaves and links to biodiversity? Check this out!
Apply before 31 January
👉coastclim.org/news
in pelagic biogeochemistry @tvarminne.bsky.social @helsinkiuni.bsky.social
Interested in investigating temporal and spatial variability in coastal sea-air GHG fluxes, impacts of heatwaves and links to biodiversity? Check this out!
Apply before 31 January
👉coastclim.org/news
December 21, 2024 at 10:23 AM
Looking for a PhD student to join us - focusing on quantifying GHG across coastal seascapes. Please help spread the word!
Reposted by Alf Norkko
📢 3-year Postdoc Opportunity ❗❗ #FoodWebs
I am seeking a postdoc to reconstruct energy fluxes in food webs using gut DNA and eDNA in mesocosms under heatwave scenarios
@tvarminne.bsky.social @coastclim.bsky.social
📅 31. of Jan. 2025
➡️ jobs.helsinki.fi/job/Hanko-3-...
Please share post ❗❗
I am seeking a postdoc to reconstruct energy fluxes in food webs using gut DNA and eDNA in mesocosms under heatwave scenarios
@tvarminne.bsky.social @coastclim.bsky.social
📅 31. of Jan. 2025
➡️ jobs.helsinki.fi/job/Hanko-3-...
Please share post ❗❗
December 19, 2024 at 9:21 PM
📢 3-year Postdoc Opportunity ❗❗ #FoodWebs
I am seeking a postdoc to reconstruct energy fluxes in food webs using gut DNA and eDNA in mesocosms under heatwave scenarios
@tvarminne.bsky.social @coastclim.bsky.social
📅 31. of Jan. 2025
➡️ jobs.helsinki.fi/job/Hanko-3-...
Please share post ❗❗
I am seeking a postdoc to reconstruct energy fluxes in food webs using gut DNA and eDNA in mesocosms under heatwave scenarios
@tvarminne.bsky.social @coastclim.bsky.social
📅 31. of Jan. 2025
➡️ jobs.helsinki.fi/job/Hanko-3-...
Please share post ❗❗
Reposted by Alf Norkko
Oooh. This looks very interesting and cool site... (ping @alfnorkko.bsky.social )
You want to know about this site that lets you explore data collected by the HMS Challenger from 1872–1876, an expedition that laid the foundation of oceanography. 🌊
challenger-expeditio...
challenger-expeditio...
December 15, 2024 at 10:19 AM
Oooh. This looks very interesting and cool site... (ping @alfnorkko.bsky.social )
Reposted by Alf Norkko
Amazing to visit @tvarminne.bsky.social to act as opponent for a PhD defence by student of @alfnorkko.bsky.social and @joannanorkko.bsky.social - what a wonderful, historical marine station with some incredible science happening. Its proper Baltic ‘ere 🥶🌊❄️
December 4, 2024 at 3:16 PM
Amazing to visit @tvarminne.bsky.social to act as opponent for a PhD defence by student of @alfnorkko.bsky.social and @joannanorkko.bsky.social - what a wonderful, historical marine station with some incredible science happening. Its proper Baltic ‘ere 🥶🌊❄️
Check out our latest CoastClim newsletter!
👉Read the latest Newsletter!
After years of extensive field work and experiments, we are looking forward to combining data and discover new insights during the coming year!
Find all letters and sign up here: coastclim.org/news
After years of extensive field work and experiments, we are looking forward to combining data and discover new insights during the coming year!
Find all letters and sign up here: coastclim.org/news
News - CoastClim
Read the latest news from CoastClim!
coastclim.org
December 3, 2024 at 3:12 PM
Check out our latest CoastClim newsletter!
Our PhD student, Norman Göbeler, working on marine heatwaves defends his thesis tomorrow with Dan Smale as external examiner. The public examination can be followed online👇
NEW PhD thesis! Norman Göbeler will defend the doctoral dissertation entitled "The role of Marine Heatwaves for
#biodiversity and #ecosystem functioning in #coastal
waters" on Wednesday 4.12.2024 at 13PM.
The public examination streamed here: helsinki.zoom.us/j/64509869274
#wearehelsinkiuni #tzs
#biodiversity and #ecosystem functioning in #coastal
waters" on Wednesday 4.12.2024 at 13PM.
The public examination streamed here: helsinki.zoom.us/j/64509869274
#wearehelsinkiuni #tzs
December 3, 2024 at 2:47 PM
Our PhD student, Norman Göbeler, working on marine heatwaves defends his thesis tomorrow with Dan Smale as external examiner. The public examination can be followed online👇
Reposted by Alf Norkko
Feeling inspired at the biannual CoastClim meeting in Stockholm, Sweden. So much good science coming out from this Swedish-Finnish consortium! With @alfnorkko.bsky.social, @cmgustafsson.bsky.social, etc.
November 13, 2024 at 1:56 PM
Feeling inspired at the biannual CoastClim meeting in Stockholm, Sweden. So much good science coming out from this Swedish-Finnish consortium! With @alfnorkko.bsky.social, @cmgustafsson.bsky.social, etc.
Reposted by Alf Norkko
New paper by Charlotte Angove as lead showing that #infauna can shift plant trait-productivity relationships in #SAV
@alfnorkko.bsky.social
onlinelibrary.wiley.com/doi/10.1002/...
@alfnorkko.bsky.social
onlinelibrary.wiley.com/doi/10.1002/...
Root puppet masters: Infauna shift trait‐productivity relationships in submerged aquatic vegetation communities
While co-restoration of seagrass and infauna is a viable solution to increase submerged aquatic vegetation (SAV) restoration success, more research is needed to understand how infauna affects the dri....
onlinelibrary.wiley.com
October 28, 2024 at 8:29 AM
New paper by Charlotte Angove as lead showing that #infauna can shift plant trait-productivity relationships in #SAV
@alfnorkko.bsky.social
onlinelibrary.wiley.com/doi/10.1002/...
@alfnorkko.bsky.social
onlinelibrary.wiley.com/doi/10.1002/...