@rompsgroup

Physics of Climate

 UC Berkeley
davidromps.com
Joined January 2019
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7Media
In 2020, OSHRC (@OSHRC_Chairman) dismissed fines by OSHA (@OSHA_DOL) against @USPS because of a lack of scientific basis for commonly used heat-index thresholds. Now, @yichuan_lu shows that scientifically based heat-index thresholds match laboratory data. romps.berkeley.edu/papers/pu…
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Using sampling of clouds by aircraft, we show that the supersaturation in convective clouds over the Amazon is too low (~0.2%) to generate substantial warm-phase invigoration of convection by aerosols. romps.berkeley.edu/papers/pu…
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In a paper led by @yanlei_feng, we show that "death by windthrow" will be a fate of trees over a much wider area of the Amazon in the coming decades due to global warming. romps.berkeley.edu/papers/pu…
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The recent paper by group member Nathaniel Tarshish has been highlighted by Eos, the official news magazine of the American Geophysical Union. Congrats, Nathaniel! eos.org/editor-highlights/ho…

How Can Nuclear Plumes Reach the Stratosphere? - Eos

A new study shows how moist convection can lift sooty air from firestorms to the stratosphere, potentially leading to a nuclear winter.

eos.org
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rompsgroup retweeted
David Romps@romps7 Sep 2022
On NPR's All Things Considered, @lesommer and @arishapiro discuss recent work on the heat index by @yichuan_lu of the @rompsgroup, @BerkeleyLab, and @BerkeleyPhysics. npr.org/2022/09/06/112134389…

Disaster experts say heat warning systems are falling short

As record-breaking heat scorches the West, some disaster experts say our warning system may not be enough. Many people aren't getting alerted when heat can be deadly.

npr.org
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On the hottest and most humid days, the heat index may be underestimating the stress your body's under news.berkeley.edu/2022/08/15… @UCBerkeley @romps

Today’s heat waves feel a lot hotter than heat index implies - Berkeley News

At the extremes of heat and humidity occurring more frequently with climate change, the heat index underestimates the stress humans experience

news.berkeley.edu
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Yes, nuclear winter is a real threat. romps.berkeley.edu/papers/pu…
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rompsgroup retweeted
David Romps@romps21 Apr 2022
For several years now, I have described the radiative forcing from CO2 by analogy to a "train", but I never made a figure to illustrate it... until now. (1/11)
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Ever wonder why the forcing from CO2 is a constant PER DOUBLING ? This paper by @romps, @takes_by_jake, and @jedman42 goes through the reasons in exhaustive detail, but the short explanation is as follows... (Thread) romps.berkeley.edu/papers/pu…
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OK, so for each doubling, the log(p_em) interval moves lower by log(2)/2. Therefore, every doubling effectively moves the same-sized set of wavenumbers from the warm surface to the cold stratosphere, reducing the outgoing flux of longwave radiation.
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This means that the forcing (i.e., the reduction in outgoing longwave) is the same for every doubling of concentration. Given the CO2 spectrum measured in laboratories, we can estimate this forcing using pencil and paper. For (many) more details, see: romps.berkeley.edu/papers/pu…
A paper led by Yixiao Zhang and @DorianAbbot, with help from Jonah Bloch-Johnson and @romps, probes the ECS bump in 51 aquaplanet simulations that are equilibrated by fixing the SST and evolving the CO2 concentration. romps.berkeley.edu/papers/pu…
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Using stereo cameras, Rusen Oktem finds that the spacing of clouds matches the prediction by John Thuburn and Georgios Efstathiou for the spacing of the largest eddies in a convective boundary layer. romps.berkeley.edu/papers/pu…
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The stereo cameras have returned some rich data on convection from their deployment to Argentina during the CACTI campaign . Paper by @adam_varble here: romps.berkeley.edu/papers/pu…. Get the CACTI stereo camera data here: iop.archive.arm.gov/arm-iop/…
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With implications for wildfires and nuclear winter, Nathaniel Tarshish uses direct numerical simulation to find the virtual origin of turbulent plumes. The important question is where the soot goes, and this closure makes progress towards answering that. romps.berkeley.edu/papers/pu…
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A new paper by @romps, Oktem, Endo, and Vogelmann proposes a classification scheme for shallow cumuli and measures, using stereo cameras, the degree to which observed clouds are bubbles vs. plumes and active vs. forced. romps.org/papers/pubs-2019-l…

Are shallow cumuli bubbles or plumes?

Data from stereo cameras and a Doppler lidar are used to quantify the degree to which shallow cumuli are bubbles or plumes.

davidromps.com
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A new study led by Yang Chen (also @randersonjt, @romps, @jacobtseeley, Veraverbeke, Riley, @zamekonnen) finds that lightning will double in parts of the Arctic underlain by permafrost, raising questions about the future of Arctic fire and carbon release. romps.org/papers/pubs-2018-a…

The future of Arctic permafrost carbon

Summer lightning in the Arctic is likely to double, increasing wildfire and releasing permafrost carbon.

davidromps.com
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See also the nice News and Views article by @DecFinney for additional context. nature.com/articles/s41558-0…
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Apologies for the oversight: the first author @Yang_Chen_yc is on Twitter! nature.com/articles/s41558-0…

Future increases in Arctic lightning and fire risk for permafrost carbon

Nature Climate Change - Changes in lightning activity are uncertain under climate change. The authors project that summer lightning in the Arctic is likely to more than double by the end of the...

nature.com
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