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Robert Rohde
@RARohde
, 3 tweets, 1 min read Read on Twitter
The North Atlantic Oscillation (NAO) is a natural form of weather variability that affects the jet stream and weather dynamics, especially in Europe.

The average state to start this summer is at a record low for this time of year.
Negative NAO states predict a jet stream that has large oscillations and is more likely to produce large swings in weather, such as... heatwaves in Europe.
Interestingly, though 2019's summer has started with the most persistent negative state in this data set, it follows the most persistent positive state in 2018.
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Robert Rohde
@RARohde
Thread) About 2 weeks ago, I wrote a thread on which twitter accounts owned by US Members of Congress were following climate scientists on Twitter.



Time for a follow-up.
2/ As a reminder, the premise of the little experiment was to compare 538 twitter accounts belonging to Members of Congress with an excellent list of >2300 climate scientists on Twitter created by @KHayhoe:

twitter.com/KHayhoe/lists/…
3/ In the original thread, I found that 47 Members of Congress had twitter accounts that were following at least one climate scientist.

However, after writing that thread, several climate scientists announced getting new followers, e.g.

Read 20 tweets
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Robert Rohde
@RARohde
Animated diagram of the Earth's Carbon Cycle and how it has changed over time.

Carbon, in various forms including CO2 and organic materials, is continually exchanged between the atmosphere, oceans, and biosphere.

However, human activities have perturbed the carbon cycle.
First frame of the animation, showing the estimated carbon stocks and flows before human intervention.

Each year large amounts of carbon move between reservoirs, but over time a natural equilibrium was achieved so that the total carbon in each group stays about constant.
For thousands of years, the pre-industrial carbon cycle was in balance and a nearly constant level of CO2 was maintained in the atmosphere.

Then humans discovered the usefulness of fossil fuels, and we started to add large amounts of carbon to the atmosphere.
Read 7 tweets
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Robert Rohde
@RARohde
Since humans began to directly measure carbon dioxide in the atmosphere, we've set a new record high nearly every May.
The industrial revolution has caused a massive amount of carbon dioxide to be added to the atmosphere.

Carbon dioxide levels in the atmosphere have increased more in the last 15 years than they did in over 9000 years prior to the introduction of fossil fuels.
In 1992, the UN Framework Convention on Climate Change set out the goal to "stabilize greenhouse gas concentrations in the atmosphere ... [and] prevent dangerous anthropogenic interference with the climate system".

And yet, we are now only ~5 ppm below the 1992 projections.
Read 3 tweets

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Katharine Hayhoe
@KHayhoe
This is a great explanation by @queenofpeat on why permafrost is one of the bigger wildcards in the climate system.
The Arctic is home to many of the climate system’s most important self-amplifying or vicious cycles, from permafrost to sea ice. But one we don’t often think about, but which could be the most dangerous of all, is ... doi.org/10.1088/1748-9…
And what happens in the Arctic doesn’t stay in the Arctic; as @MichaelEMann explains here, it affects the jet stream which in turn affects the intensity and duration of many of our weather systems, from heat waves to floods.
Read 4 tweets
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NL_Wetenschap
@NL_Wetenschap
1/Tijd voor actuele wetenschap. Ik heb zojuist het volgende paper gelezen:
"Accelerating changes in ice mass within Greenland, and the ice sheet’s sensitivity to atmospheric forcing" pnas.org/content/early/…
hier komt mijn uitleg/interpretatie
2/Het paper biedt een atmospherische verklaring voor de tijdelijke stop van het ijsverlies in Groenland (zomer 2013 to 2015)
3/Mocht je nu denken "Wacht, zei je nou dat Groenland niet meer aan massa verliest?!, Jeeh global warming has stopped!", dan moet ik je helaas teleurstellen.
Read 17 tweets
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Christophe Barraud🛢
@C_Barraud
🇨🇳 #CHINA Q3 GDP Y/Y: 6.5% V 6.6%E (slowest growth since Q1 2009)
*NBS spokesman Mao Shengyong said that the international situation was bringing “downward pressure” on China.
*Link: bloom.bg/2RVX1ZA
🇫🇷 🇪🇺 🇨🇳 French tire maker Michelin warned of declining sales in Europe and #China in the second half of the year, dragging down shares of its competitors in the U.S. and Europe - Bloomberg
*Statement: bit.ly/2EujhqH
🇺🇸🇨🇳🇪🇺 In a volley of filings, the EU, #China and the U.S. this week escalated disputes over new U.S. metals tariffs, the European response to those levies, and Chinese intellectual property practices - Bloomberg
bloomberg.com/news/articles/…
Read 634 tweets
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Jeff Seldin
@jseldin
NEW: “I have all the authority I need” per @DeptofDefense Sec Jim Mattis when asked about countering possible #Russia info ops/#cyber attacks red #Election2018
"We all saw in 2016 what happened when the #Russia|ns & possibly others, but the Russians for certain tried to do both influence operations & actually get in & actually corrupt some of the election process" per SecDef Mattis before meeting w/#British Defense Sec @GavinWilliamson
"The adversaries may be more than just #Russia" @DeptofDefense Sec Mattis tells reporters re #election security "We are not focused solely on one country. We are focused on protecting the elections themselves"
Read 13 tweets
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Andrew Erickson 艾立信
@AndrewSErickson
hearing—"#China's Worldwide #Military Expansion" is a dramatic bellwether of growing concerns in Washington & beyond.

Now online—hard-hitting arguments + many data points, some deeply-analyzed yet hard to find elsewhere in public domain:
bit.ly/HouseIC
CAPT Jim Fanell, USN Ret, former @USPacificFleet N2:

"today, the PLA Navy consists of over 330 surface ships & 66 submarines, nearly 400 combatants. As of 4 May 2018, the @USNavy consists of 283 battle force ships: 211 surface ships and 72 submarines."
bit.ly/HouseIC
"By 2030, it is estimated [by Fanell & @SCheneyPeters in their chapter in @NavalWarCollege @ChinaMaritime Studies Institute's Chinese Naval Shipbuilding volume amazon.com/Chinese-Naval-… @USNIBooks that] the PLANavy will consist of some 550 ships: 450 surface ships & 99 submarines."
Read 71 tweets
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Jeff Seldin
@jseldin
#Europe "an increasingly complex & competitive security environment," SACEUR/@US_EUCOM Commander Gen. Curtis Scaparrotti tells #SASC in opening statement
"Our adaptation to the environment has made significant progress...particularly under the European Deterrence Initiative" per Gen Scaparrotti, calling it "the largest reinforcement of Euro-Atlantic Defense in a generation"
Gen Scaparrotti also says @NATO alliance "is strong" and that "European allies & #Canada have turned a corner on defense spending with increases in each of the past 3 years" adding $46 billion to defense spending
Read 44 tweets

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