File:2020JD033158.pdf
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[edit]Description2020JD033158.pdf |
English: An abundance of evidence indicates that the tropics are expanding. Despite many attempts to decipher the cause, the underlying dynamical mechanism driving tropical expansion is still not entirely clear. Here, based on observations, multimodel simulations from the Coupled Model Intercomparison Project phase 5 (CMIP5) and purposefully designed numerical experiments, the variations and trends of the tropical width are explored from a regional perspective. We find that the width of the tropics closely follows the displacement of oceanic midlatitude meridional temperature gradients (MMTG). Under global warming, as a first‐order response, the subtropical ocean experiences more surface warming because of the mean Ekman convergence of anomalously warm water. The enhanced subtropical warming, which is partially independent of natural climate oscillations, such as the Pacific Decadal Oscillation, leads to poleward advance of the MMTG and drives the tropical expansion. Our results, supported by both observations and model simulations, imply that global warming may have already significantly contributed to the ongoing tropical expansion, especially over the ocean‐dominant Southern Hemisphere. |
Date | |
Source |
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JD033158 https://doi.org/10.1029/2020JD033158 |
Author | Hu Yang, Gerrit Lohmann, Jian Lu, Evan J. Gowan, Xiaoxu Shi, Jiping Liu, Qiang Wang |
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current | 08:02, 19 August 2020 | 1,275 × 1,650, 18 pages (20.72 MB) | Pamputt (talk | contribs) | Uploaded a work by Hu Yang, Gerrit Lohmann, Jian Lu, Evan J. Gowan, Xiaoxu Shi, Jiping Liu, Qiang Wang from https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JD033158 https://doi.org/10.1029/2020JD033158 with UploadWizard |
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Short title | Tropical Expansion Driven by Poleward Advancing Midlatitude Meridional Temperature Gradients |
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Image title | Journal of Geophysical Research: Atmospheres 2020.125:e2020JD033158 |
Author | Hu Yang, Gerrit Lohmann, Jian Lu, Evan J. Gowan, Xiaoxu Shi, Jiping Liu, Qiang Wang |
Identifier | doi:10.1029/2020JD033158 |
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Software used | Arbortext Advanced Print Publisher 9.1.440/W Unicode |
Conversion program | Acrobat Distiller 10.0.0 (Windows); modified using iText 4.2.0 by 1T3XT |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.4 |