TC (Tirthankar Chakraborty)
@tchakraborty.bsky.social
Earth Scientist @ Pacific Northwest National Lab; previously Yale (PhD '21); more previously IIT Kanpur (M.Tech '15)
| urban climate | aerosols | remote sensing | heat stress | Google Earth Engine | geospatial | machine learning |
https://tc25.github.io/
| urban climate | aerosols | remote sensing | heat stress | Google Earth Engine | geospatial | machine learning |
https://tc25.github.io/
My citation collection has apparently crossed 5000, which is definitely a number.
November 6, 2025 at 3:54 PM
My citation collection has apparently crossed 5000, which is definitely a number.
Something strange is going on with @microsoft.com #Teams for the last few days, where it keeps flagging completely correct words.
Unhelpful and distracting.
I am sensing some #AI shenanigans.
Unhelpful and distracting.
I am sensing some #AI shenanigans.
October 20, 2025 at 1:09 PM
Something strange is going on with @microsoft.com #Teams for the last few days, where it keeps flagging completely correct words.
Unhelpful and distracting.
I am sensing some #AI shenanigans.
Unhelpful and distracting.
I am sensing some #AI shenanigans.
Will be in Austin next week for the Artificial Intelligence and Digital Twins for Earth Systems workshop (aidt4es.usacm.org).
Looking forward to trying some Texas-style brisket😅; & yes, also presenting on several past/ongoing studies on applications of #machinelearning for #urban #microclimate.
Looking forward to trying some Texas-style brisket😅; & yes, also presenting on several past/ongoing studies on applications of #machinelearning for #urban #microclimate.
September 20, 2025 at 6:09 PM
Will be in Austin next week for the Artificial Intelligence and Digital Twins for Earth Systems workshop (aidt4es.usacm.org).
Looking forward to trying some Texas-style brisket😅; & yes, also presenting on several past/ongoing studies on applications of #machinelearning for #urban #microclimate.
Looking forward to trying some Texas-style brisket😅; & yes, also presenting on several past/ongoing studies on applications of #machinelearning for #urban #microclimate.
I am flabbergasted once again; this time on being one of the recipients of the Ronald L. Brodzinski Award for Early Career Exceptional Achievement, one of the Laboratory Director’s Awards for Science and Engineering Achievement at the Pacific Northwest National Laboratory.
September 9, 2025 at 1:13 PM
I am flabbergasted once again; this time on being one of the recipients of the Ronald L. Brodzinski Award for Early Career Exceptional Achievement, one of the Laboratory Director’s Awards for Science and Engineering Achievement at the Pacific Northwest National Laboratory.
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
'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
August 1, 2025 at 4:25 PM
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
'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
July 27, 2025 at 6:07 AM
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.
The deadline is July 30th.
July 19, 2025 at 11:13 PM
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.
The deadline is July 30th.
🚨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.
We hope the HUDI can be a starting point for informing #sustainable #urban design.
June 12, 2025 at 11:19 AM
🚨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.
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.
Here (doi.org/10.1088/1748...) is the closing editorial on this issue, which details the insights gained from these studies.
June 6, 2025 at 10:26 PM
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.
Here (doi.org/10.1088/1748...) is the closing editorial on this issue, which details the insights gained from these studies.
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.
Love the schematic PNNL's comms team made for this.
June 1, 2025 at 7:31 PM
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.
Love the schematic PNNL's comms team made for this.
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.
U-Surf is structurally consistent with the urban canyon assumption in process-based #models & addresses a longstanding data gap in these models.
May 27, 2025 at 1:27 PM
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.
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...
Also read the newsletter for other recent news on #urban #climate #science: urban-climate.org/wp-content/u...
May 20, 2025 at 8:32 PM
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...
Also read the newsletter for other recent news on #urban #climate #science: urban-climate.org/wp-content/u...
April 27, 2025 at 3:12 PM
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.
April 23, 2025 at 1:33 AM
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.
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.
April 23, 2025 at 1:33 AM
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%).
April 23, 2025 at 1:33 AM
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%).
📢 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.
April 23, 2025 at 1:33 AM
Finally got the chance to visit the famous "HOLLYWOO" sign from #BojackHorseman, the American adult animated tragicomedy television series that ran for 6 seasons on #Netflix between 2014 and 2020.
#LosAngeles
#LosAngeles
March 14, 2025 at 5:42 AM
Finally got the chance to visit the famous "HOLLYWOO" sign from #BojackHorseman, the American adult animated tragicomedy television series that ran for 6 seasons on #Netflix between 2014 and 2020.
#LosAngeles
#LosAngeles
We also project these urban vegetation change estimates into the future using a #machinelearning model, showing that 60% of Global North cities and 30% of Global South cities will become greener by 2040. 8/n
March 9, 2025 at 2:27 PM
We also project these urban vegetation change estimates into the future using a #machinelearning model, showing that 60% of Global North cities and 30% of Global South cities will become greener by 2040. 8/n
We find this coefficient to be 56.85% globally, but much higher for Global North cities (79.13%) than for Global South ones (38.01%). This discrepancy generally comes down to climatic effects + #socioeconomic pressures and preferences that controls a lot of the indirect vegetation growth. 6/n
March 9, 2025 at 2:27 PM
We find this coefficient to be 56.85% globally, but much higher for Global North cities (79.13%) than for Global South ones (38.01%). This discrepancy generally comes down to climatic effects + #socioeconomic pressures and preferences that controls a lot of the indirect vegetation growth. 6/n
In this study, we define an offsetting coefficient (η), which represents the ratio of this indirect growth to the direct losses, and studies how it has changed over time globally, for Global North versus Global South, by #WorldBank subregion, and for individual urban clusters. 5/n
March 9, 2025 at 2:27 PM
In this study, we define an offsetting coefficient (η), which represents the ratio of this indirect growth to the direct losses, and studies how it has changed over time globally, for Global North versus Global South, by #WorldBank subregion, and for individual urban clusters. 5/n
#Urban areas show large changes in vegetation cover over the last two decades, with cities in the #GlobalNorth generally showing greening or vegetation increase, and those in the #GlobalSouth showing browning or vegetation loss. 2/n
March 9, 2025 at 2:27 PM
#Urban areas show large changes in vegetation cover over the last two decades, with cities in the #GlobalNorth generally showing greening or vegetation increase, and those in the #GlobalSouth showing browning or vegetation loss. 2/n
In our recently published paper (doi.org/10.1038/s418...) in @naturesustain.bsky.social, we use #global #satellite-derived estimates to separate out direct effect of #urbanization on #vegetation loss from its indirect effect on vegetation growth for over 4700 #cities worldwide from 2000 to 2019. 1/n
March 9, 2025 at 2:27 PM
In our recently published paper (doi.org/10.1038/s418...) in @naturesustain.bsky.social, we use #global #satellite-derived estimates to separate out direct effect of #urbanization on #vegetation loss from its indirect effect on vegetation growth for over 4700 #cities worldwide from 2000 to 2019. 1/n