Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations
Surface temperatures increase at a greater rate over land than ocean in simulations and observations of global warming. It has previously been proposed that this land–ocean warming contrast is related to different changes in lapse rates over land and ocean because of limited moisture availability ov...
| Main Authors: | , |
|---|---|
| Format: | Journal article |
| Published: |
American Meteorological Society
2013
|
| _version_ | 1797082068950188032 |
|---|---|
| author | Byrne, M O’Gorman, P |
| author_facet | Byrne, M O’Gorman, P |
| author_sort | Byrne, M |
| collection | OXFORD |
| description | Surface temperatures increase at a greater rate over land than ocean in simulations and observations of global warming. It has previously been proposed that this land–ocean warming contrast is related to different changes in lapse rates over land and ocean because of limited moisture availability over land. A simple theory of the land–ocean warming contrast is developed here in which lapse rates are determined by an assumption of convective quasi-equilibrium. The theory predicts that the difference between land and ocean temperatures increases monotonically as the climate warms or as the land becomes more arid. However, the ratio of differential warming over land and ocean varies nonmonotonically with temperature for constant relative humidities and reaches a maximum at roughly 290 K. The theory is applied to simulations with an idealized general circulation model in which the continental configuration and climate are varied systematically. The simulated warming contrast is confined to latitudes below 50° when climate is varied by changes in longwave optical thickness. The warming contrast depends on land aridity and is larger for zonal land bands than for continents with finite zonal extent. A land–ocean temperature contrast may be induced at higher latitudes by enforcing an arid land surface, but its magnitude is relatively small. The warming contrast is generally well described by the theory, although inclusion of a land–ocean albedo contrast causes the theory to overestimate the land temperatures. Extensions of the theory are discussed to include the effect of large-scale eddies on the extratropical thermal stratification and to account for warming contrasts in both surface air and surface skin temperatures. |
| first_indexed | 2024-03-07T01:22:59Z |
| format | Journal article |
| id | oxford-uuid:90fecea2-4540-49f5-a67a-8a7d661e7a67 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:22:59Z |
| publishDate | 2013 |
| publisher | American Meteorological Society |
| record_format | dspace |
| spelling | oxford-uuid:90fecea2-4540-49f5-a67a-8a7d661e7a672022-03-26T23:15:29ZLand–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulationsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:90fecea2-4540-49f5-a67a-8a7d661e7a67Symplectic Elements at OxfordAmerican Meteorological Society2013Byrne, MO’Gorman, PSurface temperatures increase at a greater rate over land than ocean in simulations and observations of global warming. It has previously been proposed that this land–ocean warming contrast is related to different changes in lapse rates over land and ocean because of limited moisture availability over land. A simple theory of the land–ocean warming contrast is developed here in which lapse rates are determined by an assumption of convective quasi-equilibrium. The theory predicts that the difference between land and ocean temperatures increases monotonically as the climate warms or as the land becomes more arid. However, the ratio of differential warming over land and ocean varies nonmonotonically with temperature for constant relative humidities and reaches a maximum at roughly 290 K. The theory is applied to simulations with an idealized general circulation model in which the continental configuration and climate are varied systematically. The simulated warming contrast is confined to latitudes below 50° when climate is varied by changes in longwave optical thickness. The warming contrast depends on land aridity and is larger for zonal land bands than for continents with finite zonal extent. A land–ocean temperature contrast may be induced at higher latitudes by enforcing an arid land surface, but its magnitude is relatively small. The warming contrast is generally well described by the theory, although inclusion of a land–ocean albedo contrast causes the theory to overestimate the land temperatures. Extensions of the theory are discussed to include the effect of large-scale eddies on the extratropical thermal stratification and to account for warming contrasts in both surface air and surface skin temperatures. |
| spellingShingle | Byrne, M O’Gorman, P Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title | Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title_full | Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title_fullStr | Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title_full_unstemmed | Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title_short | Land–ocean warming contrast over a wide range of climates: convective quasi-equilibrium theory and idealized simulations |
| title_sort | land ocean warming contrast over a wide range of climates convective quasi equilibrium theory and idealized simulations |
| work_keys_str_mv | AT byrnem landoceanwarmingcontrastoverawiderangeofclimatesconvectivequasiequilibriumtheoryandidealizedsimulations AT ogormanp landoceanwarmingcontrastoverawiderangeofclimatesconvectivequasiequilibriumtheoryandidealizedsimulations |