Global energetics and local physics as drivers of past, present and future monsoons

TitleGlobal energetics and local physics as drivers of past, present and future monsoons
Publication TypeJournal Article
Year of Publication2018
AuthorsBiasutti M., Voigt A., Boos W.R, Braconnot P., Hargreaves J.C, Harrison S.P, Kang S.M, Mapes B.E, Scheff J., Schumacher C., Sobel A.H, Xie SP
JournalNature Geoscience
Volume11
Pagination392-+
Date Published2018/06
Type of ArticleReview
ISBN Number1752-0894
Accession NumberWOS:000433901600010
Keywordsafrican monsoon; Asian; budget; general-circulation; Geology; heat-transport; intertropical convergence zone; last glacial maximum; monsoon; overturning circulation; precipitation changes; static energy; tropical climate-change
Abstract

Global constraints on momentum and energy govern the variability of the rainfall belt in the intertropical convergence zone and the structure of the zonal mean tropical circulation. The continental-scale monsoon systems are also facets of a momentumand energy-constrained global circulation, but their modern and palaeo variability deviates substantially from that of the intertropical convergence zone. The mechanisms underlying deviations from expectations based on the longitudinal mean budgets are neither fully understood nor simulated accurately. We argue that a framework grounded in global constraints on energy and momentum yet encompassing the complexities of monsoon dynamics is needed to identify the causes of the mismatch between theory, models and observations, and ultimately to improve regional climate projections. In a first step towards this goal, disparate regional processes must be distilled into gross measures of energy flow in and out of continents and between the surface and the tropopause, so that monsoon dynamics may be coherently diagnosed across modern and palaeo observations and across idealized and comprehensive simulations. Accounting for zonal asymmetries in the circulation, land/ocean differences in surface fluxes, and the character of convective systems, such a monsoon framework would integrate our understanding at all relevant scales: from the fine details of how moisture and energy are lifted in the updrafts of thunderclouds, up to the global circulations.

DOI10.1038/s41561-018-0137-1
Short TitleNat. Geosci.
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