Kaci Zarek
@kacizarek.bsky.social
PhD student at Cornell • Holgerson Lab • biogeochem & hydro • study gassy waters 🫧
Reposted by Kaci Zarek
The rule also removes protections for ephemeral streams (waterways that flow only after rain or snow) despite their importance to downstream water quality. In short, this proposal rolls back long-standing protections and leaves millions of acres of waterways more vulnerable to pollution.
EPA & Army Corps Unveil Clear, Durable WOTUS Proposal | US EPA
EPA Administrator Lee Zeldin, and Assistant Secretary of the Army for Civil Works Adam Telle, today announced a proposed rule that would establish a clear, durable, common-sense definition of “waters ...
www.epa.gov
November 19, 2025 at 3:03 PM
The rule also removes protections for ephemeral streams (waterways that flow only after rain or snow) despite their importance to downstream water quality. In short, this proposal rolls back long-standing protections and leaves millions of acres of waterways more vulnerable to pollution.
Reposted by Kaci Zarek
It has taken more than two years (plus all the years data contributors have spent on their data collection), but finally our data descriptor manuscript preprint on Arctic-boreal carbon fluxes across terrestrial and freshwater ecosystems is out: essd.copernicus.org/preprints/es... Go have a look!
ABCFlux v2: Arctic–boreal CO2 and CH4 monthly flux observations and ancillary information across terrestrial and freshwater ecosystems
Abstract. Measurements of surface-atmosphere carbon dioxide (CO2) and methane (CH4) fluxes have been relatively sparse across the Arctic tundra and boreal biomes, causing significant uncertainties in ...
essd.copernicus.org
October 21, 2025 at 6:37 PM
It has taken more than two years (plus all the years data contributors have spent on their data collection), but finally our data descriptor manuscript preprint on Arctic-boreal carbon fluxes across terrestrial and freshwater ecosystems is out: essd.copernicus.org/preprints/es... Go have a look!
Reposted by Kaci Zarek
A fabulous #postdoc opportunity to work with my colleague Nick Ward at PNNL on forest trace gas cycling, studying a poorly constrained component of the Earth system! Please share widely: careers.pnnl.gov/jobs/10985?l...
Post Doctorate Research Associate – Forest Trace Gas Cycling in Sequim, Washington | Pacific Northwest National Laboratory
PNNL is hiring a Post Doctorate Research Associate – Forest Trace Gas Cycling in Sequim, Washington. Review all of the job details and apply today!
careers.pnnl.gov
October 22, 2025 at 10:16 AM
A fabulous #postdoc opportunity to work with my colleague Nick Ward at PNNL on forest trace gas cycling, studying a poorly constrained component of the Earth system! Please share widely: careers.pnnl.gov/jobs/10985?l...
Reposted by Kaci Zarek
Registration and abstract submissions for oral and poster presentations are now open for #ASLOSIL2026 !
Don't miss this opportunity to share your insights at the ASLO-SIL 2026 Joint Meeting 12-16 May 2026 in Montreal, Quebec, Canada. 🇨🇦
@aslo.org
Don't miss this opportunity to share your insights at the ASLO-SIL 2026 Joint Meeting 12-16 May 2026 in Montreal, Quebec, Canada. 🇨🇦
@aslo.org
October 22, 2025 at 5:13 PM
Registration and abstract submissions for oral and poster presentations are now open for #ASLOSIL2026 !
Don't miss this opportunity to share your insights at the ASLO-SIL 2026 Joint Meeting 12-16 May 2026 in Montreal, Quebec, Canada. 🇨🇦
@aslo.org
Don't miss this opportunity to share your insights at the ASLO-SIL 2026 Joint Meeting 12-16 May 2026 in Montreal, Quebec, Canada. 🇨🇦
@aslo.org
Reposted by Kaci Zarek
super excited to share that my first dissertation chapter is out in WRR!
here, we operationalize the river corridor of a headwater Coastal Plain network into hydrogeomorphic features to characterize hydrologic connectivity across dimensions
check it out here: doi.org/10.1029/2024...
here, we operationalize the river corridor of a headwater Coastal Plain network into hydrogeomorphic features to characterize hydrologic connectivity across dimensions
check it out here: doi.org/10.1029/2024...
Using Hydrogeomorphic Features to Quantify Structural and Functional Hydrologic Connectivity in a Coastal Plain Headwater Stream
Hydrogeomorphic features provide a key framework to study streamflow generation along the river corridor
Across the study watershed, hydrogeomorphic features demonstrated distinct patterns of gro...
doi.org
August 27, 2025 at 4:27 PM
super excited to share that my first dissertation chapter is out in WRR!
here, we operationalize the river corridor of a headwater Coastal Plain network into hydrogeomorphic features to characterize hydrologic connectivity across dimensions
check it out here: doi.org/10.1029/2024...
here, we operationalize the river corridor of a headwater Coastal Plain network into hydrogeomorphic features to characterize hydrologic connectivity across dimensions
check it out here: doi.org/10.1029/2024...
Reposted by Kaci Zarek
My first paper of my PhD research on catchment biogeochemistry in Michigan is live!
Wetlands, Groundwater and Seasonality Influence the Spatial Distribution of Stream Chemistry in a Low-Relief Catchment
agupubs-onlinelibrary-wiley-com.proxy2.cl.msu.edu/doi/10.1029/...
Wetlands, Groundwater and Seasonality Influence the Spatial Distribution of Stream Chemistry in a Low-Relief Catchment
agupubs-onlinelibrary-wiley-com.proxy2.cl.msu.edu/doi/10.1029/...
August 27, 2025 at 1:46 PM
My first paper of my PhD research on catchment biogeochemistry in Michigan is live!
Wetlands, Groundwater and Seasonality Influence the Spatial Distribution of Stream Chemistry in a Low-Relief Catchment
agupubs-onlinelibrary-wiley-com.proxy2.cl.msu.edu/doi/10.1029/...
Wetlands, Groundwater and Seasonality Influence the Spatial Distribution of Stream Chemistry in a Low-Relief Catchment
agupubs-onlinelibrary-wiley-com.proxy2.cl.msu.edu/doi/10.1029/...
Reposted by Kaci Zarek
What mechanisms underlie near-universal export patterns of dissolved carbon from land to rivers?
Reactions at different depths regulate their directionality (+ or -); subsurface flow paths control strength
Congrats to Dr. Bryn Stewart! rubyfu.caltech.edu/people/bryn-...
doi.org/10.1029/2024...
Reactions at different depths regulate their directionality (+ or -); subsurface flow paths control strength
Congrats to Dr. Bryn Stewart! rubyfu.caltech.edu/people/bryn-...
doi.org/10.1029/2024...
July 29, 2025 at 10:02 PM
What mechanisms underlie near-universal export patterns of dissolved carbon from land to rivers?
Reactions at different depths regulate their directionality (+ or -); subsurface flow paths control strength
Congrats to Dr. Bryn Stewart! rubyfu.caltech.edu/people/bryn-...
doi.org/10.1029/2024...
Reactions at different depths regulate their directionality (+ or -); subsurface flow paths control strength
Congrats to Dr. Bryn Stewart! rubyfu.caltech.edu/people/bryn-...
doi.org/10.1029/2024...
Reposted by Kaci Zarek
Hydrology Paper of the Day @profbobhilton.bsky.social on transport of river-dissolved inorganic carbon on a global scale: isotopic analyses indicating decadal and millennial-age carbon stores; constraining river carbon emissions; and landscape-scale controls in context of the global carbon budget.
New paper! led by Josh Dean “Old carbon routed from land to the atmosphere by global river systems”
doi.org/10.1038/s415...
#radiocarbon in #rivers reveals the age of CO2 they release to the atmosphere.
An active leak of old carbon from land.
🧪⚒️
@joshfdean.bsky.social @oxuniearthsci.bsky.social
doi.org/10.1038/s415...
#radiocarbon in #rivers reveals the age of CO2 they release to the atmosphere.
An active leak of old carbon from land.
🧪⚒️
@joshfdean.bsky.social @oxuniearthsci.bsky.social
June 23, 2025 at 2:39 AM
Hydrology Paper of the Day @profbobhilton.bsky.social on transport of river-dissolved inorganic carbon on a global scale: isotopic analyses indicating decadal and millennial-age carbon stores; constraining river carbon emissions; and landscape-scale controls in context of the global carbon budget.
Reposted by Kaci Zarek
Wrapping up your PhD? I’m planning to hire a postdoc in the next few months (start date flexible). Will start formally advertising soon, but you heard it here first!! Possible research topics include - critical zone hydrology, agricultural water quality, SW-GW interactions. Reach out if interested!
June 6, 2025 at 7:02 PM
Wrapping up your PhD? I’m planning to hire a postdoc in the next few months (start date flexible). Will start formally advertising soon, but you heard it here first!! Possible research topics include - critical zone hydrology, agricultural water quality, SW-GW interactions. Reach out if interested!
Reposted by Kaci Zarek
Hydrologists! Ever heard of a Spatial Hydrograph? Our new paper in @agu.org GRL shows that the SWOT satellite can capture spatial flow waves propagating down rivers—something previously only only observable at river gauges: doi.org/10.1029/2024...
#SWOT #hydrology #RemoteSensing #EarthObservation
#SWOT #hydrology #RemoteSensing #EarthObservation
May 19, 2025 at 6:15 PM
Hydrologists! Ever heard of a Spatial Hydrograph? Our new paper in @agu.org GRL shows that the SWOT satellite can capture spatial flow waves propagating down rivers—something previously only only observable at river gauges: doi.org/10.1029/2024...
#SWOT #hydrology #RemoteSensing #EarthObservation
#SWOT #hydrology #RemoteSensing #EarthObservation
Reposted by Kaci Zarek
The relationship between topography & the terrestrial water cycle has been documented for thousands of years, yet there is still much to learn about Earth’s complex dynamics–both above, at, & below the surface.🏔️🌧️
🔗 Learn more in @eos.org : buff.ly/y6r3yAr
#AGUPubs @reviewsgeophysics.bsky.social
🔗 Learn more in @eos.org : buff.ly/y6r3yAr
#AGUPubs @reviewsgeophysics.bsky.social
Topography and the Terrestrial Water Cycle - Eos
The relationship between topography and the terrestrial water cycle has been documented for thousands of years, yet there is still much to learn about Earth’s complex dynamics – both above, at, and…
buff.ly
March 13, 2025 at 2:00 PM
The relationship between topography & the terrestrial water cycle has been documented for thousands of years, yet there is still much to learn about Earth’s complex dynamics–both above, at, & below the surface.🏔️🌧️
🔗 Learn more in @eos.org : buff.ly/y6r3yAr
#AGUPubs @reviewsgeophysics.bsky.social
🔗 Learn more in @eos.org : buff.ly/y6r3yAr
#AGUPubs @reviewsgeophysics.bsky.social
Reposted by Kaci Zarek
Congratulations to Dr. Amy Burgin (@burginam.bsky.social), our 2025 Leadership Award recipient! Dr. Burgin received this Career Award for her extraordinary work in furthering SFS' mission. freshwater-science.org/2025-leaders...
We look forward to celebrating with you at #2025SFS!
We look forward to celebrating with you at #2025SFS!
April 25, 2025 at 2:03 AM
Congratulations to Dr. Amy Burgin (@burginam.bsky.social), our 2025 Leadership Award recipient! Dr. Burgin received this Career Award for her extraordinary work in furthering SFS' mission. freshwater-science.org/2025-leaders...
We look forward to celebrating with you at #2025SFS!
We look forward to celebrating with you at #2025SFS!
Reposted by Kaci Zarek
Latest paper out of the WS hydrology lab! Here we show spatial variability in lithology is important for streamflow behavior and carbon export, but geogenic solute export behavior is similar. agupubs.onlinelibrary.wiley.com/doi/full/10....
The Role of Lithology on Concentration‐Discharge Relationships and Carbon Export in Two Adjacent Headwater Catchments
Bedrock lithology drives differences in streamflow and carbon export in adjacent catchments, controlling variability in shallow flow paths Both catchments display similar in-stream major ion conc...
agupubs.onlinelibrary.wiley.com
April 1, 2025 at 8:15 PM
Latest paper out of the WS hydrology lab! Here we show spatial variability in lithology is important for streamflow behavior and carbon export, but geogenic solute export behavior is similar. agupubs.onlinelibrary.wiley.com/doi/full/10....
Reposted by Kaci Zarek
When streams dry up, it can mean big changes for the nitrogen cycle—but those changes don’t appear to be what scientists expected. eos.org/research-spo...
The “Surprising” Effect of Drying Headwaters on Nitrogen Dynamics - Eos
Contrary to predictions, spring rains caused a decrease in nitrogen at watershed outflows in Alabama.
eos.org
April 15, 2025 at 1:51 PM
When streams dry up, it can mean big changes for the nitrogen cycle—but those changes don’t appear to be what scientists expected. eos.org/research-spo...
Reposted by Kaci Zarek
I passed! I’m so grateful for all the support :) Dr. Pruitt sounds pretty cool!
March 31, 2025 at 7:52 PM
I passed! I’m so grateful for all the support :) Dr. Pruitt sounds pretty cool!
So excited for my first first author paper of my master’s research to be published!! Woohoo!! Couldn’t have done it without the amazing coauthors and AIMS team!
Big CONGRATS to @kacizarek.bsky.social!!! Her new paper is out in @agu.org's JGR-B!
The paper has a little bit of everything -- N biogeochemistry, intermittent stream hydrology, concentration-connectivity relationships!
Check it out here: agupubs.onlinelibrary.wiley.com/doi/full/10....
The paper has a little bit of everything -- N biogeochemistry, intermittent stream hydrology, concentration-connectivity relationships!
Check it out here: agupubs.onlinelibrary.wiley.com/doi/full/10....
March 28, 2025 at 2:19 AM
So excited for my first first author paper of my master’s research to be published!! Woohoo!! Couldn’t have done it without the amazing coauthors and AIMS team!
Reposted by Kaci Zarek
I’m defending next Thursday (March 27, 9am ET)! If you want the zoom link, let me know!
March 17, 2025 at 5:39 PM
I’m defending next Thursday (March 27, 9am ET)! If you want the zoom link, let me know!
Reposted by Kaci Zarek
EPA's "WOTUS Notice" press release. With this updated guidance, most wetlands will lose federal protections under the Clean Water Act.
www.epa.gov/newsreleases...
www.epa.gov/newsreleases...
Administrator Zeldin Announces EPA Will Revise Waters of the United States Rule | US EPA
EPA News Release: Administrator Zeldin Announces EPA Will Revise Waters of the United States Rule
www.epa.gov
March 12, 2025 at 4:04 PM
EPA's "WOTUS Notice" press release. With this updated guidance, most wetlands will lose federal protections under the Clean Water Act.
www.epa.gov/newsreleases...
www.epa.gov/newsreleases...
Reposted by Kaci Zarek
Celebrating paper acceptance with @kacizarek.bsky.social and @thatsmedelp.bsky.social!!!
February 28, 2025 at 2:13 AM
Celebrating paper acceptance with @kacizarek.bsky.social and @thatsmedelp.bsky.social!!!
Reposted by Kaci Zarek
For anyone curious about what "indirect" (Facilities and Administrative) costs related to government-sponsored research, this video is helpful
F&A are imperative to be able to perform research and a massive cut to this would jeopardize American science writ large
www.youtube.com/watch?v=yxTD...
F&A are imperative to be able to perform research and a massive cut to this would jeopardize American science writ large
www.youtube.com/watch?v=yxTD...
Facilities and Administrative (F&A) Costs Explainer
YouTube video by Association of American Universities
www.youtube.com
February 9, 2025 at 11:22 PM
For anyone curious about what "indirect" (Facilities and Administrative) costs related to government-sponsored research, this video is helpful
F&A are imperative to be able to perform research and a massive cut to this would jeopardize American science writ large
www.youtube.com/watch?v=yxTD...
F&A are imperative to be able to perform research and a massive cut to this would jeopardize American science writ large
www.youtube.com/watch?v=yxTD...
Reposted by Kaci Zarek
Happy new year!
Thrilled to announce Women Advancing River Research (WARR) 2025, featuring inspiring women on water research from around the world.
11 am, US eastern, 3rd Thursday every month.
Register: psu.zoom.us/meeting/regi...
Recordings 2021- 2024: www.cee.psu.edu/events/women...
Thrilled to announce Women Advancing River Research (WARR) 2025, featuring inspiring women on water research from around the world.
11 am, US eastern, 3rd Thursday every month.
Register: psu.zoom.us/meeting/regi...
Recordings 2021- 2024: www.cee.psu.edu/events/women...
January 3, 2025 at 2:53 PM
Happy new year!
Thrilled to announce Women Advancing River Research (WARR) 2025, featuring inspiring women on water research from around the world.
11 am, US eastern, 3rd Thursday every month.
Register: psu.zoom.us/meeting/regi...
Recordings 2021- 2024: www.cee.psu.edu/events/women...
Thrilled to announce Women Advancing River Research (WARR) 2025, featuring inspiring women on water research from around the world.
11 am, US eastern, 3rd Thursday every month.
Register: psu.zoom.us/meeting/regi...
Recordings 2021- 2024: www.cee.psu.edu/events/women...
Reposted by Kaci Zarek
Fellow nonperennial stream enthusiasts and researchers! We are excited to announce that we are hosting a special session at SFS 2025 “From the mountains to the seas: Expanding the sciences of non-perennial streams."
December 18, 2024 at 4:49 PM
Fellow nonperennial stream enthusiasts and researchers! We are excited to announce that we are hosting a special session at SFS 2025 “From the mountains to the seas: Expanding the sciences of non-perennial streams."
Reposted by Kaci Zarek
... AND got to present a poster on our new project understanding the drivers of channel initiation across the larger Southeast! thank you to Mark DeGraff for the opportunity to share this work with the larger community, and excited to see where it goes from here!
Where do streams and rivers start? The answer has been a point of uncertainty for regulators, managers, and researchers for decades!
Check out @thatsmedelp.bsky.social's feature in @agu.org's EOS:
eos.org/articles/mob...
Check out @thatsmedelp.bsky.social's feature in @agu.org's EOS:
eos.org/articles/mob...
Mobile Bay Has More Branching Brooks Than Shown on Federal Maps - Eos
A more accurate charting of the full extent of stream networks will help land managers better protect U.S. creeks and rivers.
eos.org
December 16, 2024 at 9:57 PM
... AND got to present a poster on our new project understanding the drivers of channel initiation across the larger Southeast! thank you to Mark DeGraff for the opportunity to share this work with the larger community, and excited to see where it goes from here!
Reposted by Kaci Zarek
Looking forward to seeing LOTS of amazing science & scientists at #AGU24 next week! Reach out if you're going & would like to connect. One panel, several posters, & two talks I'm associated with are listed below. (Thurs will be busy!) #wetlands #streams #carbon #AGU #biogeochemistry #hydrology
💧🌎🧪👩🔬
💧🌎🧪👩🔬
December 5, 2024 at 8:26 PM
Looking forward to seeing LOTS of amazing science & scientists at #AGU24 next week! Reach out if you're going & would like to connect. One panel, several posters, & two talks I'm associated with are listed below. (Thurs will be busy!) #wetlands #streams #carbon #AGU #biogeochemistry #hydrology
💧🌎🧪👩🔬
💧🌎🧪👩🔬
Reposted by Kaci Zarek
@thatsmedelp.bsky.social giving a great talk on hydrogeomorphic features at AGU Fall Meeting!
December 12, 2024 at 2:37 PM
@thatsmedelp.bsky.social giving a great talk on hydrogeomorphic features at AGU Fall Meeting!