TC (Tirthankar Chakraborty)

The EPA cited my paper in their argument against the endangerment finding today. However, their point is completely backwards: my paper actually supports the EPA's 2009 range of 1.8C to 4C warming by 2100. www.nature.com/artic...

I am co-chairing a couple of sessions at #AMS26.

'Mapping and Modeling Urban Environments Exposures and Corresponding Health Impacts': lnkd.in/g55YHZ-C

'Weather-human-energy dynamics in urban areas': lnkd.in/gMmaGbUb

You can submit to all sessions through: lnkd.in/g_KWM5tu

Deadline: 14 August

I keep complaining about people submitting their abstracts too close to the deadline; and here I am...

#AGU25

@agu.org

Perfect.

@agu.org

It's the last weekend before the #AGU25 #abstract submission #deadline, which means it is finally time to submit your abstracts and crash their website.

If you are working on #urban-scale processes, consider submitting to our sessions (links below).

1. lnkd.in/gXXtKvtb

2. lnkd.in/gWuN2Yw6

If you are working on #urban modeling across #scales (#process-based to #hybrid to #machinelearning models), including development, benchmarking, and implementation, please submit to our #AGU25 session on this topic: lnkd.in/gTpTrw-9

The deadline is July 30th.

17th Conference on Environment and Health The 106th AMS Annual Meeting will take place from 25 to 26 January, 2026 in Houston, Texas.

🚨Call for Abstracts! Submit to the 17th AMS Conference on Environment & Health at #AMS2026 by Aug 14, 2026 🗓️
See the list of topic sessions and joint sessions 🌡️🌍 🎓 Student awards available! Feel free to reach out for more info! annual.ametsoc.org/2026/program...
@ametsoc.org

PhD Intern - Urban Dynamics in Earth System Models in Multiple Locations | Pacific Northwest National Laboratory PNNL is hiring a PhD Intern - Urban Dynamics in Earth System Models in Multiple Locations. Review all of the job details and apply today!

I am looking to hire (careers.pnnl.gov/jobs/10733?l...) a PhD #intern to work on representing #urban expansion in the Earth system models. One goal after implementing this capability would be to examine the impact of different projections of urban land on #weather extremes & #climate.

Please share.

🚨In our new paper (doi.org/10.1016/S254... in @thelancetplanet.bsky.social, we develop the Healthy Urban Design Index (HUDI) to gauge the performance of 917 cities in 4 key domains in #Europe using #opensource data.

We hope the HUDI can be a starting point for informing #sustainable #urban design.

I had been guest editing a focus issue on 'Human-Earth System Interactions under Climate Change' for Environmental Research Letters with several of my colleagues.

Here (doi.org/10.1088/1748...) is the closing editorial on this issue, which details the insights gained from these studies.

Older #BlueSky thread on key results of the study: bsky.app/profile/tcha...

Article (www.pnnl.gov/publications...) on a few recent papers I have contributed to, particularly our @natgeosci.nature.com paper (doi.org/10.1038/s415...) on the impact of #agricultural #irrigation in the #UnitedStates on #urban #heatstress.

Love the schematic PNNL's comms team made for this.

U-Surf: a global 1 km spatially continuous urban surface property dataset for kilometer-scale urban-resolving Earth system modeling Abstract. High-resolution urban climate modeling has faced substantial challenges due to the absence of a globally consistent, spatially continuous, and accurate dataset to represent the spatial heter...

Read more here: doi.org/10.5194/essd...

In our recent paper in @copernicusecmwf.bsky.social Earth System Science Data, we develop #U-Surf, a global 1 km facet-level #urban property dataset.

U-Surf is structurally consistent with the urban canyon assumption in process-based #models & addresses a longstanding data gap in these models.

A summary of the results of our recent Nature Communications paper (doi.org/10.1038/s414...) is the feature article of this quarter's International Association for Urban Climate newsletter.

Also read the newsletter for other recent news on #urban #climate #science: urban-climate.org/wp-content/u...

The #climate pledge is dying in the U.S., but at least I have been getting a good view of its namesake arena + the #Seattle skyline. 🤷

Our recent @agu.org @eos.org article on our past and ongoing efforts at the Pacific Northwest National Laboratory to train #Earth scientists on applications of #AI and #machinelearning approaches to address real-world #research problems in the #geosciences.

Crowdsourced air temperatures contrast satellite measures of the urban heat island and its mechanisms Satellites overestimate urban heat islands.

This presentation is on Friday and covers results from a few studies, including doi.org/10.1126/scia..., doi.org/10.1029/2022..., doi.org/10.1088/1748..., and doi.org/10.1016/j.uc....

I was also invited to give a talk in the "Nature based Solutions to address growing risk of Urban Heat Islands interacting with Climate Change" session. For that, I will be complaining about using #satellite-derived land surface #temperature to estimate the #cooling benefits of urban #vegetation.

First, tomorrow (if I can wake up on time), I will be giving an overview of our last year's study (doi.org/10.1016/j.on...) examining the impact of #urban evolution (urban growth + changes in urban properties over time) on #continental to #regional-scale #warming.

I am attending #EGU25 virtually this year.

I have a couple of presentations:

📢 In our recently published paper in Nature #Climate Change, we show that, when we consider the entire #annual cycle, the protective effects of the #urban #heat island during the coldest periods exceed (by over 4 times) the adverse effects during the warmest periods for most non-tropical #cities.

Dual impact of global urban overheating on mortality - Nature Climate Change The urban heat island (UHI) effect can increase and decrease mortality depending on the season, yet global comparison is still lacking. This study finds that the UHI effect has net positive impact by ...

Most importantly, our study highlights the importance of considering local context when designing urban #heat mitigation strategies.

Read here for more: doi.org/10.1038/s415...

And let me know if you don't have access to the paper.

These results demonstrate the importance of considering the entire annual cycle when trying to protect urban dwellers from temperature-related hazards. We also note & test seasonally adjustable strategies to optimize this, but stress the importance of testing the economic viability of these efforts.

However, for tropical cities, we do see a net negative effect of the UHI when considering the annual cycle, with mitigation strategies leading to net reductions in mortality.

We extend this analysis to also quantify the impact of common heat mitigation strategies, such as #greening & #albedo management on temperature-related mortality. We find that strategies only focused on mitigating #summer heat would cause net increases in temperature-related mortality over the year.

Based on our sample of 3000+ cities & a data-driven approach, we find that this reduction in cold-related mortality due to the UHI (51.5%) is 4.4 times greater than the increase in heat-related mortality (11.7%).

However, the UHI is not an additional environmental stressor under all circumstances, since a higher temperature may reduce #cold-related mortality during colder parts of the year, especially in mid- and high-latitude cities.

The vast majority of studies on the #urban #heat #island (UHI) effect, especially those on the #publichealth implications of the UHI, have focused on the hotter parts of the year, when the UHI generally increases #temperature-related mortality.

📢 In our recently published paper in Nature #Climate Change, we show that, when we consider the entire #annual cycle, the protective effects of the #urban #heat island during the coldest periods exceed (by over 4 times) the adverse effects during the warmest periods for most non-tropical #cities.