Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium
To understand why tropical islands are rainier than nearby ocean areas, we explore how a highly idealized island, which differs from the surrounding ocean only in heat capacity, might respond to the diurnal cycle and influence the tropical climate, especially the spatial distribution of rainfall and...
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| Format: | Article |
| Language: | en_US |
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Wiley Blackwell
2015
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| Online Access: | http://hdl.handle.net/1721.1/99153 https://orcid.org/0000-0002-2066-2082 |
| _version_ | 1826194123501076480 |
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| author | Cronin, Timothy Wallace Molnar, Peter H. Emanuel, Kerry Andrew |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Cronin, Timothy Wallace Molnar, Peter H. Emanuel, Kerry Andrew |
| author_sort | Cronin, Timothy Wallace |
| collection | MIT |
| description | To understand why tropical islands are rainier than nearby ocean areas, we explore how a highly idealized island, which differs from the surrounding ocean only in heat capacity, might respond to the diurnal cycle and influence the tropical climate, especially the spatial distribution of rainfall and the thermal structure of the troposphere. We perform simulations of three-dimensional radiative-convective equilibrium with the System for Atmospheric Modeling (SAM) cloud-system-resolving model, with interactive surface temperature, where a highly idealized, low heat capacity circular island is embedded in a slab-ocean domain. The calculated precipitation rate over the island can be more than double the domain average value, with island rainfall occurring primarily in an intense, regular thunderstorm system that forms in the afternoon to early evening each day. Island size affects the magnitude of simulated island rainfall enhancement, the intensity of the convection, and the timing of the rainfall maximum relative to solar noon. A combination of dynamic and thermodynamic mechanisms leads to a monotonic enhancement of domain-averaged tropospheric temperature with increasing fraction of island surface, which may contribute to localization of ascent over the Maritime Continent and its relationship to the Walker Circulation. |
| first_indexed | 2024-09-23T09:51:20Z |
| format | Article |
| id | mit-1721.1/99153 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:51:20Z |
| publishDate | 2015 |
| publisher | Wiley Blackwell |
| record_format | dspace |
| spelling | mit-1721.1/991532022-09-30T17:12:59Z Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium Cronin, Timothy Wallace Molnar, Peter H. Emanuel, Kerry Andrew Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Program in Atmospheres, Oceans, and Climate Woods Hole Oceanographic Institution Emanuel, Kerry Andrew Emanuel, Kerry Andrew To understand why tropical islands are rainier than nearby ocean areas, we explore how a highly idealized island, which differs from the surrounding ocean only in heat capacity, might respond to the diurnal cycle and influence the tropical climate, especially the spatial distribution of rainfall and the thermal structure of the troposphere. We perform simulations of three-dimensional radiative-convective equilibrium with the System for Atmospheric Modeling (SAM) cloud-system-resolving model, with interactive surface temperature, where a highly idealized, low heat capacity circular island is embedded in a slab-ocean domain. The calculated precipitation rate over the island can be more than double the domain average value, with island rainfall occurring primarily in an intense, regular thunderstorm system that forms in the afternoon to early evening each day. Island size affects the magnitude of simulated island rainfall enhancement, the intensity of the convection, and the timing of the rainfall maximum relative to solar noon. A combination of dynamic and thermodynamic mechanisms leads to a monotonic enhancement of domain-averaged tropospheric temperature with increasing fraction of island surface, which may contribute to localization of ascent over the Maritime Continent and its relationship to the Walker Circulation. National Science Foundation (U.S.) (Grant AGS 1136466) National Science Foundation (U.S.) (Grant AGS 1136480) 2015-10-06T16:50:19Z 2015-10-06T16:50:19Z 2014-11 2014-08 Article http://purl.org/eprint/type/JournalArticle 00359009 1477-870X http://hdl.handle.net/1721.1/99153 Cronin, Timothy W., Kerry A. Emanuel, and Peter Molnar. “Island Precipitation Enhancement and the Diurnal Cycle in Radiative-Convective Equilibrium.” Q.J.R. Meteorol. Soc. 141, no. 689 (November 7, 2014): 1017–1034. https://orcid.org/0000-0002-2066-2082 en_US http://dx.doi.org/10.1002/qj.2443 Quarterly Journal of the Royal Meteorological Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Wiley Blackwell Prof. Emanuel via Chris Sherratt |
| spellingShingle | Cronin, Timothy Wallace Molnar, Peter H. Emanuel, Kerry Andrew Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title | Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title_full | Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title_fullStr | Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title_full_unstemmed | Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title_short | Island precipitation enhancement and the diurnal cycle in radiative-convective equilibrium |
| title_sort | island precipitation enhancement and the diurnal cycle in radiative convective equilibrium |
| url | http://hdl.handle.net/1721.1/99153 https://orcid.org/0000-0002-2066-2082 |
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