Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates
Seeley and Wordsworth (2021, https://doi.org/10.1038/s41586-021-03919-z ) showed that in small-domain cloud-resolving simulations the temporal pattern of precipitation transforms in extremely hot climates (≥320K) from quasi-steady to organized episodic deluges, with outbursts of heavy rain alterna...
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Online Access: | https://doi.org/10.1029/2023MS003912 http://knowledge.uchicago.edu/record/12687 |
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ftunichicagoknow:oai:uchicago.tind.io:12687 2024-09-09T20:04:22+00:00 Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates Song, Xinyi Abbot, Dorian S. Yang, Jun 2024-06-22T01:19:10Z https://doi.org/10.1029/2023MS003912 http://knowledge.uchicago.edu/record/12687 eng eng https://knowledge.uchicago.edu/record/12687/files/Critical-Role-of-Vertical-Radiative-Cooling-Contrast-in-Triggering-Episodic-Deluges-in-Small-Domain-Hothouse-Climates.pdf https://knowledge.uchicago.edu/record/12687/files/Supporting-information.zip doi:https://doi.org/10.1029/2023MS003912 http://knowledge.uchicago.edu/record/12687 http://knowledge.uchicago.edu/record/12687 Text 2024 ftunichicagoknow https://doi.org/10.1029/2023MS003912 2024-08-05T14:08:09Z Seeley and Wordsworth (2021, https://doi.org/10.1038/s41586-021-03919-z ) showed that in small-domain cloud-resolving simulations the temporal pattern of precipitation transforms in extremely hot climates (≥320K) from quasi-steady to organized episodic deluges, with outbursts of heavy rain alternating with several dry days. They proposed a mechanism for this transition involving increased water vapor greenhouse effect and solar radiation absorption leading to net lower-tropospheric radiative heating. This heating inhibits lower-tropospheric convection and decouples the boundary layer from the upper troposphere during the dry phase, allowing lower-tropospheric moist static energy to build until it discharges, resulting in a deluge. We perform cloud-resolving simulations in polar night and show that the same transition occurs, implying that some revision of their mechanism is necessary. We perform further tests to show that episodic deluges can occur even if the lower-tropospheric radiative heating rate is negative, as long as the magnitude of the upper-tropospheric radiative cooling is about twice as large. We find that in the episodic deluge regime the period can be predicted from the time for radiation and reevaporation to cool the lower atmosphere. Text polar night Knowledge@UChicago (University of Chicago) Journal of Advances in Modeling Earth Systems 16 6 |
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Knowledge@UChicago (University of Chicago) |
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ftunichicagoknow |
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English |
description |
Seeley and Wordsworth (2021, https://doi.org/10.1038/s41586-021-03919-z ) showed that in small-domain cloud-resolving simulations the temporal pattern of precipitation transforms in extremely hot climates (≥320K) from quasi-steady to organized episodic deluges, with outbursts of heavy rain alternating with several dry days. They proposed a mechanism for this transition involving increased water vapor greenhouse effect and solar radiation absorption leading to net lower-tropospheric radiative heating. This heating inhibits lower-tropospheric convection and decouples the boundary layer from the upper troposphere during the dry phase, allowing lower-tropospheric moist static energy to build until it discharges, resulting in a deluge. We perform cloud-resolving simulations in polar night and show that the same transition occurs, implying that some revision of their mechanism is necessary. We perform further tests to show that episodic deluges can occur even if the lower-tropospheric radiative heating rate is negative, as long as the magnitude of the upper-tropospheric radiative cooling is about twice as large. We find that in the episodic deluge regime the period can be predicted from the time for radiation and reevaporation to cool the lower atmosphere. |
format |
Text |
author |
Song, Xinyi Abbot, Dorian S. Yang, Jun |
spellingShingle |
Song, Xinyi Abbot, Dorian S. Yang, Jun Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
author_facet |
Song, Xinyi Abbot, Dorian S. Yang, Jun |
author_sort |
Song, Xinyi |
title |
Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
title_short |
Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
title_full |
Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
title_fullStr |
Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
title_full_unstemmed |
Critical Role of Vertical Radiative Cooling Contrast in Triggering Episodic Deluges in Small-Domain Hothouse Climates |
title_sort |
critical role of vertical radiative cooling contrast in triggering episodic deluges in small-domain hothouse climates |
publishDate |
2024 |
url |
https://doi.org/10.1029/2023MS003912 http://knowledge.uchicago.edu/record/12687 |
genre |
polar night |
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polar night |
op_source |
http://knowledge.uchicago.edu/record/12687 |
op_relation |
https://knowledge.uchicago.edu/record/12687/files/Critical-Role-of-Vertical-Radiative-Cooling-Contrast-in-Triggering-Episodic-Deluges-in-Small-Domain-Hothouse-Climates.pdf https://knowledge.uchicago.edu/record/12687/files/Supporting-information.zip doi:https://doi.org/10.1029/2023MS003912 http://knowledge.uchicago.edu/record/12687 |
op_doi |
https://doi.org/10.1029/2023MS003912 |
container_title |
Journal of Advances in Modeling Earth Systems |
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16 |
container_issue |
6 |
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1809936445412999168 |