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Adrienne Marshall

@hydro-adrienne.bsky.social
1.1K followers 744 following 52 posts

Hydrologist and assistant professor. Climate and snow hydrology, hydroclimate, hydropower.

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Reposted by Adrienne Marshall
Christopher Callahan @ccallahan45.bsky.social · 15/10/2026
🚨📈 New preprint! Every ton of CO2 matters. We show that near-term climate impacts are linear in cumulative CO2 emissions. Every ton emitted adds to damages and every ton not emitted avoids damages. w/ @lfreese.bsky.social, Marissa Childs, & @marshallburke.bsky.social eartharxiv.org/repository/v...
eartharxiv.org
Near-term climate impacts are roughly linear in cumulative CO2 emissions
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Noel Healy @drnoelhealy.bsky.social · 25/09/2026
The assault on US universities didn't start in 2025. Our new paper traces the decades of corporate capture that made it possible, and why climate research is a primary target. Open access: www.sciencedirect.com/science/arti...
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Adrienne Marshall @hydro-adrienne.bsky.social · 11/09/2026
😂yes, turned out I really didn’t need to though!
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Adrienne Marshall @hydro-adrienne.bsky.social · 10/09/2026
Proud to say I got a version of this one too! It included this gem:
Screenshot of text reading: One small shift in perspective can explain everything that the Big Bang and Dark Matter theories cannot. Hold on to your butt:
   All matter did not form in a single Big Bang event.
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Reposted by Adrienne Marshall
Daniel Swain @weatherwest.bsky.social · 11/08/2026
My commentary on Marshall et al 2026's climate change rapid attribution study on severe Western U.S. snow drought, which developed during record-warm 2026 winter & has contributed to widespread drought & wildfire-related impacts since, is now out. [Thread] www.pnas.org/doi/10....
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Mitch Tobin @mitchtobin.bsky.social · 05/08/2026
I had a very interesting—and sobering—conversation with Adrienne Marshall (@hydro-adrienne.bsky.social), lead author of a new study on climate change and the West’s 2026 snow drought. Some scary projections if emissions keep climbing—but that’s not a fait accompli. waterdesk.org/2026/08/clim...
waterdesk.org
Climate change made the West’s snow drought far more likely—but it’s still not the new normal
Q&A with hydrologist Adrienne Marshall on why this past winter’s snowpack fell so low, how global warming increased the odds and what the future may hold
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Proceedings of the National Academy of Sciences @pnas.org · 28/07/2026
High temperatures and low precipitation in the American West last winter led to record-low snowpack. A study finds that such a snow drought is 4.4 times more likely in the current climate than it would have been in the pre-industrial climate. In PNAS: ow.ly/LKKh50ZtquX
Low snowpack is visible on the Front Range mountains from Interstate 25 near Colorado Springs on February 21, 2026, during an unusually dry winter season. Stock photo.
CREDIT: Mark Courage / Shutterstock.com
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Adrienne Marshall @hydro-adrienne.bsky.social · 20/07/2026
In a moderately high emissions scenario, snow droughts this severe would become three times more common than they are now by the 2050s and more common than not by the 2090s. We should think about (1) how to adapt and (2) how to reduce emissions to reduce the frequency of these events.
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Adrienne Marshall @hydro-adrienne.bsky.social · 20/07/2026
We find that this year’s snow drought was about 4.4x more likely in our climate-changed world than it would have been in the late 1800s. Snow volume was about 25% lower than it would have been then, meaning the missing water volume was approximately equivalent to the size of Lake Mead.
Line graph showing the return periods of different snow volume levels in four spatial domains in a counterfactual and factual period, along with estimated risk ratios.
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Adrienne Marshall @hydro-adrienne.bsky.social · 20/07/2026
New paper out in @pnas.org: this year’s western U.S. snow conditions were pretty dismal, but to what extent was this snow drought due to climate change?  Paper: www.pnas.org/doi/10.1073/... (with Marianne Cowherd, Stefan Rahimi, Yuhong Ye) Thread:👇
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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ProPublica @propublica.org · 25/06/2026
NEW: This is the story of how one of the most influential climate papers in history came to exist thanks to one of the companies most responsible for causing the climate crisis — and one with a financial stake in the technologies described in the paper. w/ @drilledmedia.bsky.social
propublica.org
Beyond Denial: How Oil Execs Shaped a Landmark Climate Study
BP sponsored an elite Princeton research center to address the climate problem without getting off fossil fuels. Its key work, a paper known as “Wedges,” guided climate discourse for a generation.
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AGU Hydrology H3S @agu-h3s.bsky.social · 06/06/2026
A great figure can elevate your paper, increase scientific accessibility, and even become art. Are you an early career researcher in hydrology with a (published) figure that you are proud of? H3S wants to spotlight you! Submissions accepted here → docs.google.com/forms/d/e/1F...
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 03/06/2026
Hydrology Paper of the Day @hydro-adrienne.bsky.social on how water flow in a river is related to the amount of water shared between water right holders: relating hydrograph standard deviation of timing to a spatial geography of processes; correlations with Q; and a case study of the Rio Grande.
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Adrienne Marshall @hydro-adrienne.bsky.social · 30/04/2026
This paper started as a conversation with water economist Steven Smith when I was interviewing at Colorado School of Mines way back in 2021 - proud it’s finally out in the world! #Hydrology #WaterRights #ClimateChange #WesternWater #WaterManagement
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Adrienne Marshall @hydro-adrienne.bsky.social · 30/04/2026
In the prior appropriations systems of the Western U.S., a narrowing runoff window can shift the timing and quantity of water available to different users. Our simulations suggest this "squeeze" can favor junior rights holders over seniors, even if the total annual supply hasn't changed.
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Adrienne Marshall @hydro-adrienne.bsky.social · 30/04/2026
We developed a metric we call the Standard Deviation of Timing (SDoT) to quantify this "width." We find that SDoT is largely narrowing in the East and the coastal western U.S., with some widening in the intermountain west.
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Adrienne Marshall @hydro-adrienne.bsky.social · 30/04/2026
We know a lot about how climate change is impacting the total volume and center of timing of streamflow, but there's been much less work on the width of the streamflow hydrograph—how spread out or clustered streamflow is throughout the year.
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Adrienne Marshall @hydro-adrienne.bsky.social · 30/04/2026
New paper out today in Nature Water! We examine how changes in the *width* of the streamflow hydrograph affect water allocation among junior and senior water users. Paper: www.nature.com/articles/s44... No paywall: rdcu.be/fgfl5 @natwater.nature.com
(a) trends in SDoT at gauges across the US; (b) trends in SDoT aggregated to the basin scale; (c) SDoT sensitivity to temperature; (d) SDoT sensitivity to precipitation
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Li Li (李黎) @lireactivewater.bsky.social · 05/01/2026
Happy new year! Women Advancing River Research (WARR) 2026, featuring woman scientists from around the world. 3rd Thursday each month, 11 – 12 noon US ET Pls spread the word. Register: psu.zoom.us/meeting/regi... @waterbarnes.bsky.social @agu-h3s.bsky.social @aguwaterquality.bsky.social
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Alexandra Witze @alexwitze.bsky.social · 18/12/2025
#AGU25 folks, there is a rapid- response town hall TODAY on the #NCAR dismantling at 1 pm, La Nouvelle Orleans ballroom C (per an AGU media advisory)
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Adrienne Marshall @hydro-adrienne.bsky.social · 04/12/2025
Very excited to be joining!
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Adrienne Marshall @hydro-adrienne.bsky.social · 05/11/2025
New #GRL paper led by Kyla Bazlen shows that lower, earlier snow leads to streamflow spread out more over the water year. Proud to have worked on this with Kyla! agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Maps show the relationship between peak snow water equivalent, date of peak snow, and four indices of streamflow spread across the western U.S. All show that lower snow yields wider spread.
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Adrienne Marshall @hydro-adrienne.bsky.social · 27/10/2025
New paper out led by Jeff Jenkins shows how snow extremes combine with reservation systems to drive visitor access in Yosemite ⛰️. Fun to collaborate with Jeff and the team-always great to push forward understanding of how human and environmental systems interact. www.nature.com/articles/s41...
nature.com
Snow droughts, deluge, and reservation systems interact to drive recreation access at Yosemite National Park - Scientific Reports
Scientific Reports - Snow droughts, deluge, and reservation systems interact to drive recreation access at Yosemite National Park
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Adrienne Marshall @hydro-adrienne.bsky.social · 20/10/2025
Loved this work!
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Matthias Sprenger @matthiasprenger.bsky.social · 10/10/2025
Our new research analyzing high-frequency soil moisture data from 40 NEON sites across 17 US ecoregions reveals the widespread occurrence of Preferential Flow (PF) & its drivers across continental scale environmental gradients. Published in AGU's Geophysical Research Letters doi.org/10.1029/2025...
doi.org
Ubiquity and Causes of Soil Water Preferential Flow Across 17 Ecoregions
Preferential flow (PF) is ubiquitous across the USA and occurs in up to 60% of all rainfall events ≥2 mm Rainfall intensity, soil texture, and antecedent soil moisture emerge as critical in gener...
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Adrienne Marshall @hydro-adrienne.bsky.social · 07/10/2025
🌧️ Correlation distances of precipitation gauges vary in both space and time! New work out in @agu.org's GRL, led by @alexayeo.bsky.social (with @lakeographer.bsky.social and me) examines precip correlation distances over the US. Check it out: agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Maps of the US, showing trends in precipitation correlation distances over a 70-year observational record in each season. Summer correlation distances are decreasing.
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 05/10/2025
Hydrology Paper of the Day @akoshkin.bsky.social @hydro-adrienne.bsky.social on how wildfires affected by climate change remove trees and also affect snowpack hydroclimatology: changes in annual snow disappearance date related to location, radiation, temperature, elevation, and time since burn.
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Adrienne Marshall @hydro-adrienne.bsky.social · 18/09/2025
Nice article from @bloomberg.com summarizing @akoshkin.bsky.social's new work on snow-fire interactions: news.bloombergtax.com/health-law-a...
news.bloombergtax.com
Snow Melts Fast in Wildfire Burn Areas, Imperiling Water Supply
Snow is melting faster in Western US forests scorched by wildfire, threatening drinking water supplies as climate change grips the region, according to research published Wednesday in the journal Scie...
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Adrienne Marshall @hydro-adrienne.bsky.social · 18/09/2025
Super excited to have this work out showing how snowmelt timing changes in burned forests across the west. Big congrats to @akoshkin.bsky.social on leading this! 🎉
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Jon Duncan @watershedduncan.bsky.social · 24/07/2025
Calling all catchment enthusiasts! Do you have any catchment science or critical zone science updates to share? Please consider attending and supporting long-term sites by submitting an abstract to H046! #AGU2025
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Adrienne Marshall @hydro-adrienne.bsky.social · 02/07/2025
Feels like a weird time to be talking about regular stuff, but: if you're working on climate and snow and headed to AGU, consider submitting to our session! agu.confex.com/agu/agu25/pr... Lucky to be organizing with @mtnclimrhoades.bsky.social , Will Rudisill, Kate Hale, @akoshkin.bsky.social
media.tenor.com
a cartoon of snoopy laying in a red shack in the snow with the words trendreisst below him
Alt: a cartoon of snoopy laying in a red shack in the snow
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IIASA @iiasa.ac.at · 01/07/2025
Would you like to be part of the conversation at the first ever Overshoot Conference that will be hosted at IIASA from 30 September to 2 October this year? ⏰ We are happy to share that the abstract submission deadline has been extended to this Friday, 4 July. Details available on the link below 👇
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Adrienne Marshall @hydro-adrienne.bsky.social · 25/02/2025
And R. It’s my best/only productivity hack
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Adrienne Marshall @hydro-adrienne.bsky.social · 25/02/2025
I get that this is not the main point but a great thing I learned from my PhD advisor: shift-option-8. ° works in more software places than you would think!
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American Meteorological Society @ametsoc.org · 21/02/2025
The AMS is temporarily opening its career services to all who need them, regardless of membership status, and offering dues waivers and meeting registration fee reductions for those impacted by job loss due to changes in the government. Read more: bit.ly/4gRiHAk
The official AMS logo.
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Laura Lautz @llautz.bsky.social · 19/02/2025
Yesterday was the darkest day of my professional life so far. Many of NSF’s best and brightest people fired indiscriminately. The terms of their firing cruel. My colleagues matter, they are valued and they make a difference. I have no words. www.npr.org/2025/02/18/n...
npr.org
National Science Foundation fires roughly 10% of its workforce
NSF fired 168 employees, leaving the agency less equipped to fund a wide range of scientific research.
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Brenhin Keller @brenhinkeller.bsky.social · 24/01/2025
For any earth science grad students looking for a postdoc next year! ⚒️🧪
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Eric J Anderson @lakeographer.bsky.social · 19/01/2025
(Lake) Depth Matters...to weather forecasting doi.org/10.1029/2024...
doi.org
Depth Matters: Lake Bathymetry Selection in Numerical Weather Prediction Systems
Lake bathymetry plays a critical role in determining lake surface water temperature in numerical weather models Changing bathymetry in the 1-D lake model of an operational weather model had stron...
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Althea Archer @aaarcher.bsky.social · 16/01/2025
The U.S. Geological Survey (USGS) Vizlab has just released a new, interactive data visualization website about the USGS National Water Availability Assessment Report and Data Companion. Explore the data and the key findings of the assessment at water.usgs.gov/vizlab/water... #DataViz #rstats #USGS
Stylized illustration of the water cycle of the lower 48 United States, showing the fate of water that enters through precipitation. Most of the water returns to the atmosphere through evapotranspiration, but much of the water ends up in the Atlantic and Pacific Oceans, in Canada, or in the Gulf of Mexico through streamflow.Map of water limitation in the lower 48 United States by watershed. Areas with relatively high water limitation are in the high plains, Texas, California, and the Mississippi Embayment hydrologic regions.
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Dr. Crystal A. Kolden @pyrogeog.bsky.social · 15/01/2025
Appreciate the opportunity to chat w/ @nytimes.com about how we can build smarter (and to code!!) after these wildfires. Suspending wildfire building codes only kicks the can down the road and invites another disaster. Hardened homes and defensible space for the win. www.nytimes.com/interactive/...
nytimes.com
How L.A.'s Housing Development Plays a Role in Wildfire Risk
Fierce winds and months of drought set the conditions for the catastrophic wildfires in Los Angeles, but the growth of housing in fire-prone areas also played a major role.
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Adrienne Marshall @hydro-adrienne.bsky.social · 14/01/2025
Extremely highly recommend working with Emily if you get a chance!
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Emily Grubert @gruberte.bsky.social · 14/01/2025
🚨job alert🚨 Would you, or someone you know, like to channel something into thinking rigorously about how safe and electrified housing for everyone might also save the grid? I'm hiring a postdoc! 1-2 years, remote ok, $75k/year. Focus: model scenarios on deep building efficiency & grid impacts
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Joseph D. Ortiz @earthsciinfo.bsky.social · 12/01/2025
How far back in time can you go to find the earliest climate science related warning re what we now call GHG emissions & their effect on climate change? It turns out, it's a very long time. The earliest I know of relates to the work of Eunice Newton Foote. 🧪🔌💡 www.climate.gov/news-feature... +...
climate.gov
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Joe Rand @josephrand.bsky.social · 13/01/2025
Some new insights and possible solutions to grid interconnection issues in this new (free, open access) journal article from our team at @berkeleylabemp.bsky.social We're also actively working on an update to the annual Queued Up report. Stay tuned! #energysky
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 11/01/2025
Hydrology Paper of the Day @hydro-adrienne.bsky.social on how hydrological processes are affected by variability with respect to temperature changes that can exceed a future global warming target before declining to a threshold: infrastructure, glaciers, biogeography, and further research.
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Emily Grubert @gruberte.bsky.social · 10/01/2025
Excited about this one -- we've got a ton of great modeling work that tells us broadly what climate / energy transition might look like, but it's time to start looking closely at complexity. Here we talk about issues with the water system that are different if we see warming that's later reversed.
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Emily Grubert @gruberte.bsky.social · 09/01/2025
Not that this is a new or original thought but because these fires, like others, have harmed people I love and taken more of my history away: this (actually worse than this) is what net zero gets us. We need to go so much harder.
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Adrienne Marshall @hydro-adrienne.bsky.social · 08/01/2025
New commentary paper out this week with @gruberte.bsky.social and Sara Warix in WRR - we argue that temperature overshoot has consequences for regional hydrology and water resources that bear consideration. agupubs.onlinelibrary.wiley.com/doi/full/10....
Drawing of the water cycle in a landscape with and without temperature overshoot. Impacts include forest cover, glacial contributions, infrastructure, geomorphology, water use for carbon dioxide removal, groundwater depletion.
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Li Li (李黎) @lireactivewater.bsky.social · 03/01/2025
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...
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James Dinneen @jamesdinneen.bsky.social · 27/12/2024
Under a very high emissions scenario, days with deep snow may disappear across the US except high mountains by the end of the century. “We see places like New Hampshire turning into places like New Jersey, which is a bit hard to swallow," said @lizloveswinter.bsky.social at #AGU2024
newscientist.com
Snow days set to disappear across much of the US
By the end of the century, the eastern and southern US may never see deep snow cover the ground, with consequences for water storage as well as for the life on and beneath the snow
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