Will Knapp

@lithologuy @oshorttle Great to see this out, so interesting. Thanks for posting!

@blueicehiggins Relating high weathering rates measured via cation loss in field to measurement of cation + alkalinity concs in watershed (which should go up a lot!) is a piece of the puzzle that’s missing, and not satisfying without. Tracing sec. processes downstream/ocean is a sleepless night!

But that's not all! It turns out the silica that reaches the 🌊 is 😍'd by life (diatoms and others). These diatoms ☠️, ⬇️ to the seabed, and in very little time they are turned into clay minerals! A phenomenon known since the 90's (see below; Michalopoulos & Aller, 1995). If that silica comes from your ERW, you just lost your carbon credit! These losses should be added to the losses associated with clay formation on land. Where do you end up? My guess is something substantially less than is being reported. 4/4!

Let's talk about 'enhanced' 🪨 weathering (ERW) and strategies (that are published) for monitoring, reporting, and verification of CO2 removal. ERW is one of the current 🔥 places to stick CO2 for a low low (or at least reasonable) 💰. For the 📰- I am all in favor of stopping 🌎🌡️ and think that moving away from 🦖⛽️ as fast as possible is the way to go. I'm also 😎 with CO2 removal if its cheap and robust. But as someone who as spent a lot of ⏳🤔 about the processes that move CO2 through the 🌎 system, I think it's gonna be hard! A 🧵1/4

I'm delighted to share Measurements in Geochemical CDR, a document that brings together the range of analytical techniques in the field. Free from here doi.org/10.17861/2GE7-… @bastianinilaura @Liam_Geochem @VeronicaFurey @GeoloJess_ @olivia_hawrot @WillKnapp18 @_sashawilson_

@ElliotChangPhD Thank you Elliot!

@WillKnapp18 Congrats on this work, Will. Appreciate the insights into subprocesses beyond the field.

Check out our latest paper in ES&T. We take a granular approach to quantify the secondary processes that impact carbon removal downstream of an enhanced rock weathering site. Measuring cation loss from feedstocks on the field isn't enough! pubs.acs.org/doi/10.1021/ac…

This work was made a lot of fun by collaborating with a group of excellent people. Travelling to @SUERC1 to perform radiocarbon analyses was a great highlight! Thanks all.

@dpcarrington Study relating to this article suggests 14kg of CO2 is removed per 1000 kg of glacial flour applied per hectare, not including emissions from transport and spreading. This is a negligible sink of CO2… perhaps even a source of CO2 once fully audited? sciencedirect.com/science/articl…

Rock ‘flour’ from Greenland can capture significant CO2, study shows - Powder produced by ice sheets could be used to help tackle #ClimateCrisis when spread on farm fields Story by me theguardian.com/environment/20…

@svetaradio @osumgr @GlacierOffshore Awesome Sveta! Congrats

Searching for forams in Antarctic sediments at @osumgr in Oregon this week, having joined the THOR team @GlacierOffshore as a postdoc earlier this month! 🔬 🇦🇶 🐚

@TDaltonC @PeterOlivier Already happening! kita.earth

@PeterOlivier Put another way, “how long until I can get an insurance policy for my carbon credits?”

which carbon company/broker is going to be the first to sell tons with a "or your money back, guaranteed" promise? (impossible for lots of reasons, but still)

Just 🚨 one more day 🚨 to submit an abstract to session 9G, exploring the importance of timescales in carbon cycling - shaping up to be a great session!

We are hiring! Vacancy for a Grade 6 Technician in our group. Duties include technique/method development, training PhD students/ project staff, and radiocarbon sample processing. Full 14C training available. *Deadline 22nd March* See: jobs.ac.uk/job/CXR455/tec… @SUERC1 @UofGlasgow

A great study led by @YongjieLin2017, and a fun one to be a part of! agupubs.onlinelibrary.wiley.com/doi/10.1029/20…

@TMGernon @goldschmidt2023 Would be great to see you!

@WillKnapp18 @goldschmidt2023 Sounds like a great session - definitely interested!

Carbon; it's about time! The carbon cycle operates over a range of timescales, from slow tectonic uplift, to rapid strong acid reactions. If you're interested in what makes the carbon cycle tick, submit an abstract to session 9G @goldschmidt2023! conf.goldschmidt.info/goldschmidt/20…

Good to be at the @UKERW_GGRD Annual Meeting today discussing the latest outputs from our #ERW #FieldTrials. Here Ros Rickaby from @OxUniEarthSci discusses the potential fate of carbon transported as alkalinity in rivers (using the recent paper by @WillKnapp18 & @UCam_RiverWATCH)

Lab cleaning post refurbishments, going from dusty lab back to clean lab! The perfect distraction from thesis writing. @EarthSciCam @Alasdair_Knight @YongjieLin2017 @moh_tarique

A few tweets listing all @EFL and @premierleague #football teams in the order of age of bedrock #geology of their stadiums (to answer @_james_craig and @the_palaeoninja as to which is the oldest)... (1/8)

Riverwatch gets salty with a day at the beach! Collecting seawater for masters student Tian’s project, trying to understand the fate of riverine DIC in estuarine environments #35PSU

New research led by Christina Larkin @cslarkin1, with Alex Piotrowski & @UCam_RiverWATCH🎇 An historic ‘weather map’ of ocean currents in the North Atlantic 🌊🗺️ The high res Nd isotope study gives a new angle on deep water formation during the LGM. 👉nature.com/articles/s4156…

A fun afternoon coring through travertines formed rapidly following carbonation of waste material from the steel industry to think about how to reduce CO2 emissions from industry with ⁦@WillKnapp18⁩