Arsh Grewal

Never too late!

Yes, isotopes! See pinned post for example. And mostly cold due to latitude.

I'm currently looking for an MSc student to characterize water ages and storage in cold catchments. Several potential projects available, and I will support students who want to develop their own! If interested, please reach out soon at akgrewal@usask.ca, as Sept 2026 app deadlines are approaching!

Thanks for the shoutout!

New paper alert integrating #isotope-aided with N-modelling to quantify (dis)connections of different flow paths & related biogeochemical transformations with spatially-explicit estimates of water ages & Damköhler no. ‪@kinarnicholas.bsky.social‬ cld u highlight? THANKS! doi.org/10.1029/2025...

Recent Advances in Tracer‐Aided Mixing Modeling of Water in the Critical Zone Tracer-aided mixing models are uniquely capable of identifying water flow paths and sources within the Critical Zone Recent advances offer novel tracers and models for deeper and more accurate in...

Excited to share our new review in Reviews of Geophysics! We explored the latest advances in tracer-aided mixing models for studying water in the Critical Zone. We synthesize new tracer methods, models, & key insights. I think it'll be a valuable resource for the community doi.org/10.1029/2024...

Thanks Erin Nicholls (not on blusky) for the ET processing and to everyone that helped with the fieldwork for this! @dbarrett867.bsky.social @snowhydro-ty.bsky.social @andrasszeitz.bsky.social

The youngest water in storage contributed to ET bc of shallow rooted veg. Results suggest new rain is stored in vadose zone & is disconnected from stream, bc of high field capacity in organic soils. Large rain events and rising water tables appear to mobilize this water, leading to mixing in storage

The SAS function for Q suggests preferential selection of water of intermediate ages during low flows, meaning that newer water does not preferentially contribute to stream. The SAS function was more uniform during high flows, potentially due to mixing in storage. (3/n)

Streamflow in spring was mostly snow water due to limited mixing with frozen storage. Melting ground ice in the active layer was a significant component of discharge post freshet. Tracer aided WB results show most of the snowmelt left as runoff and most of the rain exited the basin as ET. (2/n)

Hot off the press! New paper characterizing storage and release processes in two permafrost catchments with @theoryofciaran.bsky.social @seankcarey.bsky.social. We characterized these processes by closing the water balance, EMMA, and StorAge Selection Functions (1/n) doi.org/10.1029/2024...

Low-relief catchments are super complex and awesome, but they have not received as much attention as our complex and awesome high-relief catchments. Here we show in a low relief catchment just how complex things can be and how spatial sampling frameworks help us solve stream chemistry mysteries!

Hydrology Paper of the Day @gregverkaik.bsky.social @micaheckert.bsky.social @peatofmind.bsky.social on how changes to drainage and spatial burn patterns affected biogeochemical cycles and vegetation cover in a peatland: depth of burn, carbon loss, and burn severity in context of a fuel load model.

Thanks for the shout-out Doerthe!!

Thanks for the shout-out!

Greater permafrost extent led to increased seasonality in major ions, whereas stronger topographic gradients led to greater seasonality in DOC. This paper includes sites from Wolf Creek Research Basin as well as the Tombstone Waters Observatory! (3/3)

After accounting for Q, we found seasonality in both major ion and DOC concentrations at all sites. Our results suggest seasonal ground thaw primarily drives seasonality in major ions, whereas flushing of the organic layer during freshet may be an important driver of seasonal DOC (2/n).

The role of catchment characteristics, discharge, and active- layer thaw in seasonal stream chemistry across 10 permafrost catchments Abstract. High-latitude catchments are rapidly warming, leading to altered precipitation regimes, widespread permafrost degradation, and shifts in stream chemistry across major arctic rivers. In headw...

New paper alert in HESS with Erin Nicholls and @seankcarey.bsky.social ! We used generalized additive models to assess the drivers of seasonality in stream chemistry across ten permafrost catchments in the Yukon Territory! (1/n)

hess.copernicus.org/articles/29/...

If voters are the problem, what lead them to become the problem? I like to think we haven't adapted to the social media age yet. The 'whole truth' is there, but it's buried with misleading or incomplete info. I think over time, we will get better at sifting through the crap. That's the hope atleast.

Deadline to apply is one week!

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Job Alert: Water Sciences Research Technician in @msunatsci.bsky.social working with two research groups. Full-time, career track. Great benefits. Deadline January 20, 2025. Complete position description and how to apply at careers.msu.edu/jobs/search. Search position number 1012771. Details below.

Landscape Ecohydrology | IGB We aim to understand the ecohydrological functioning of catchments at different spatio-temporal scales, i.e. how and how long is water stored and released in landscapes. For this, we link landscapes a...

We'll advertise 3 positions soon in our group, Berlin Germany 1 permanent scientist/groupleader position in ecohydrological modelling; 2 postdocs in ecohydrological modelling in #wetlands. Females- pls apply. Email me when you are interested. Check our groups webpage www.igb-berlin.de/en/tetzlaff