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Glen Peters
@Peters_Glen
, 5 tweets, 4 min read Read on Twitter
What emission metric is best?
* Global Warming Potential (GWP)
* Global Temperature Potential (GTP)
* Ocean Heat Content (OHC)

There are many choices, & @AarneClimate reminded me about one of my papers...

(mini thread)

iopscience.iop.org/article/10.108…
The GWP, the "gold" standard, gets a lot of critiques because it does not represent temperature. Though, it does represent the cumulative energy added to the system, & may serve well for things like sea level rise and so on...

Don't forget it was only intended as an example!
2/
The GTP is a measure of temperature, and therefor links very well to the Paris Agreement. Though, the OHC may be more robust as most of the energy sits in the ocean. @RogerAPielkeSr has advocated this for a long time.

See also @hausfath carbonbrief.org/guest-post-obs…
3/
The integrate GTP (iGTP), the point of the original article iopscience.iop.org/article/10.108…, is a measure of the energy lost out of the system, & since the energy in the system eventually decays (except CO₂), it is very similar to the GWP. In fact, we defend the GWP...
4/
The GWP & iGTP (stocks) are very similar, & the GTP and OHC (flows) are also similar (as absolute metrics). This is all easy to show analytically with a simple 2-layer energy balance model. All in the said paper... (I was much smarter 5+ years ago)
iopscience.iop.org/article/10.108…
5/5
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Glen Peters
@Peters_Glen
THREAD

Will Direct Air Capture grow from a few small facilities to an automotive style industry removing billions of tonnes of CO₂ from the atmosphere every year?

@jongertner explores at @nytclimate, & in this thread I pick up on a few nice quotes...
nytimes.com/2019/02/12/mag…
Most readers will think of Direct Air Capture (DAC) as (permanent) CO₂ Removal from the atmosphere (with underground storage), but most commercial pathways are in agriculture, food, or synthetic fields (which is CO₂ neutral not CO₂ negative). 2/
Wise words @hal_harvey, “The only way that direct air capture becomes meaningful is if we do all the other things we need to do promptly”.

Unfortunately, many think that CO₂ removal is a technology to clean the mess, no, it is only meaningful if the house is already clean. 3/
Read 14 tweets
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Glen Peters
@Peters_Glen
"Elbilene er bare sju prosent av bilparken, så [utslipp] effekten skal ikke være så veldig stor. Vi har hatt en generell trafikkvekst og økning i bilparken siden lenge før elbilene kom på markedet, og det vil maskere noe av virkningen", sier Figenbaum
tu.no/artikler/klima…
Eller, den mindre diplomatiske versjonen fra meg: "Ikke mulig å se noen klimavirkning av norske elbiler"

Vi bør bare innrømme det (som forskere), i stedet for å prøve å finne måter rundt det.
Det er litt som togradersmål: "I see my role as a scientist to point out the obstacles and challenges, not just tell the positive news stories so others can sleep well at night." cicero.oslo.no/no/posts/klima…
Read 3 tweets
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Glen Peters
@Peters_Glen
What will CO₂ emissions do in 2019?

IMF estimates GDP to grow 3.5% in 2019, & that implies:
* 1.6% CO₂ growth if CO₂/GDP improves as in the last decade,
* <0% CO₂ grow requires CO₂/GDP to have one of largest recorded declines

(figure: growth rates for GDP, CO₂, CO₂/GDP)
If the predicted GDP growth transpires, the @MLiebreich prediction of a decline in CO₂ emissions is rather bold. I would like to think he is on the money, but even the 2014-2016 CO₂/GDP would not get us there. 2/4
I am not sure of the Trump links, but the 2014-2016 lower CO₂ growth was due to larger than expected declines in US & Chinese coal. If we don't have something like that in 2019, then something else will have to pick up to get CO₂ emissions down. 3/4
carbonbrief.org/analysis-globa…
Read 4 tweets

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Zeke Hausfather
@hausfath
Estimates of ocean warming have been revised substantially upward – by around 40% – in the years since the IPCC 5th Assessment Report, as we discuss in our article in Science today (w/ @Lijing_Cheng). Over at @CarbonBrief we provide a detailed look: carbonbrief.org/guest-post-obs… [1/6]
Around 93% of the additional heat trapped by greenhouse gases in the atmosphere ends up being absorbed by the oceans. Ocean heat content is a critical measure of climate change, and shows the warming signal much more clearly than the more noisy surface record. [2/6]
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MacroPru
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Laurie Garrett
@Laurie_Garrett
The State of Climate (from American Meteorological Society):
- Unprecedented Multiyear Coral Reef Bleaching Occurred
- Tropical Cyclones Were Slightly Above Average Overall
- Antarctic Sees Record Low Sea Ice Extent
[MORE]
ncei.noaa.gov/news/reporting…
[CONT2]
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- Global Upper Ocean Heat Content Record High
- Sea Surface Temperatures Near-Record High
- Global Lower Tropospheric Temperature Near-Record High
- Global Surface Temperature Near-Record High
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Jonti Sparrow
@JontiSparrow
This could be fun! For each like this picture gets I’ll reply with an answer to the list :) Go!
1. First Game.

Tough one to start as I got a second-hand Commadore 64 with a pile of games together. But a couple of notable ones that stick out were Paperboy, Dizzy and Postman Pat. Used to love loading the cassette in before school to find it loaded when I got home!
2. Favourite Character

Guybrush Threepwood from the Monkey Island series... got a feeling that series may show up a few times on this list, I was a fan! ‘That’s the second biggest monkey head I’ve ever seen!’
Read 32 tweets
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Dr. Samantha Montano
@SamLMontano
So much disaster & emergency management research exists.

No one reads it. Let's change this.

My twitter resolution is to post one journal article a day for the whole year.

#EmergencyManagement101 #EMGTwitter #SciComm
(I’ll post open source articles when available but if you can't access an article DM and I will send you a copy.)
Let’s start at the beginning. Samuel Prince’s 1920 dissertation is credited with being the first systematic social analysis of a disaster.

books.google.com/books?hl=en&lr…
Read 127 tweets

Trending hashtags

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