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Sensitivity of subtropical stationary circulations to global warming in climate models: a baroclinic Rossby gyre theory

  • Xavier J. Levine
  • William R. Boos
Article
  • 115 Downloads

Abstract

Time-mean, zonally asymmetric circulations maintain an intense hydrologic contrast between monsoon regions and subtropical drylands in Earth’s present climate. Climate model simulations suggest that this hydrologic contrast will increase in twenty-first-century global warming scenarios, but the response of the zonally asymmetric circulations to global mean temperature is poorly understood. Here we adapt a simple theory for the strength of time-mean, subtropical, zonally asymmetric circulations (hereafter called stationary circulations) and demonstrate its relevance to summer stationary circulation changes in the Northern Hemisphere in an ensemble of comprehensive climate model simulations of global warming. The theory, which is based on the dynamics of a subtropical Rossby gyre that is in Sverdrup balance and has the vertical structure of a first-baroclinic mode, shows that the weakening of stationary ascent with global warming in the multi-model mean can be represented as a compensation between two processes: a lifting of the tropical tropopause and a decrease of the tropospheric zonal temperature gradient, which respectively require strengthening and weakening of vertical mass flux in the Rossby gyre. A large fraction of the intermodel variance in global warming-induced changes in stationary ascent is associated with intermodel variance in zonal tropospheric temperature gradient changes, which we in turn attribute to intermodel variance in zonal sea surface temperature gradient changes. These results show that much of the sensitivity of subtropical hydrologic contrasts to global mean temperature can be understood in terms of a linear vorticity balance and properties of moist adiabats.

Keywords

Stationary circulation Rossby gyre First-baroclinic mode dynamics Climate change CMIP5 archive 

Notes

Acknowledgements

We are grateful to three anonymous reviewers for their insightful comments. Xavier J. Levine and William R. Boos were supported by National Science Foundation awards AGS-1515960 and AGS-1746160. CMIP5 output were obtained from the World Data Center for Climate (WDCC) website at https://cera-www.dkrz.de.

References

  1. Bony S, Bellon G, Klocke D, Sherwood S, Fermepin S, Denvil S (2013) Robust direct effect of carbon dioxide on tropical circulation and regional precipitation. Nat Geosci 6:447–451CrossRefGoogle Scholar
  2. Brown RG, Bretherton CS (1995) A test of the strict quasi-equilibrium theory on long time and space scales. J Atmos Sci 72:624–638Google Scholar
  3. Chen T-C (2010) Characteristics of summer stationary waves in the Northern Hemisphere. J Clim 23:4489–4507CrossRefGoogle Scholar
  4. Chen P, Hoerling MP, Dole RM (2001) The origin of the subtropical anticyclones. J Atmos Sci 58:1827–1835CrossRefGoogle Scholar
  5. Cherchi A, Alessandri A, Masina S, Navarra A (2011) Effects of increased CO2 levels on monsoons. Clim Dyn 37:83–101CrossRefGoogle Scholar
  6. Cherchi A, Annamalai H, Masina S, Navarra A (2014) South Asian summer monsoon and the eastern Mediterranean climate: the monsoon-desert mechanism in CMIP5 simulations. J Clim 27:6877–6903CrossRefGoogle Scholar
  7. Chou C, Chen CA (2010) Depth of convection and the weakening of tropical circulation in global warming. J Clim 23:3019–3030CrossRefGoogle Scholar
  8. Chou C, Neelin JD (2003) Mechanisms limiting the northward extent of the Northern summer monsoons over North America, Asia, and Africa. J Clim 16:406–425CrossRefGoogle Scholar
  9. Chou C, Neelin JD (2004) Mechanisms of global warming impacts on regional tropical precipitation. J Clim 17:2688–2701CrossRefGoogle Scholar
  10. Chou C, Neelin JD, Su H (2001) Ocean–atmosphere–land feedbacks in an idealized monsoon. Q J R Meteorol Soc 127:1869–1891CrossRefGoogle Scholar
  11. Chou C, Neelin JD, Chen CA, Tu JY (2009) Evaluating the ‘rich-get-richer’ mechanism in tropical precipitation change under global warming. J Clim 22:1982–2005CrossRefGoogle Scholar
  12. Chou C, Wu T-C, Tan P-H (2013) Changes in gross moist stability in the tropics under global warming. Clim Dyn 41:2481–2496CrossRefGoogle Scholar
  13. Dai A, Li H, Sun Y, Hong L-C, Chou C, Zhou T (2013) The relative roles of upper and lower tropospheric thermal contrasts and tropical influences in driving Asian summer monsoons. J Geophys Res 118:7024–7045CrossRefGoogle Scholar
  14. Dee DP et al (2011) The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q J R Meteorol Soc 137:553–597CrossRefGoogle Scholar
  15. Emanuel KA (1995) On thermally direct circulations in moist atmospheres. J Atmos Sci 52:1529–1534CrossRefGoogle Scholar
  16. Gill AE (1980) Some simple solutions for heat-induced tropical circulation. Q J R Meteorol Soc 106:447–462CrossRefGoogle Scholar
  17. He J, Soden BJ (2017) A re-examination of the projected subtropical precipitation decline. Nat Clim Change 7:53–57CrossRefGoogle Scholar
  18. He J, Soden BJ, Kirtman B (2014) The robustness of the atmospheric circulation and precipitation response to future anthropogenic surface warming. Geophys Res Lett 41:2614–2622CrossRefGoogle Scholar
  19. He C, Wu B, Zou L, Zhou T (2017) Responses of the summertime subtropical anticyclones to global warming. J Clim 30:6465–6479CrossRefGoogle Scholar
  20. Held IM, Soden BJ (2000) Water vapor feedback and global warming. Annu Rev Energy Environ 25:441–475CrossRefGoogle Scholar
  21. Held IM, Soden BJ (2006) Robust responses of the hydrological cycle to global warming. J Clim 19:5686–5699CrossRefGoogle Scholar
  22. Kelly P, Kravitz B, Lu J, Leung LR (2018) Remote drying in the North Atlantic as a common response to precessional changes and CO2 increase over land. Geophys Res Lett 45:3615–3624CrossRefGoogle Scholar
  23. Knutson TR, Manabe S (1995) Time-mean response over the tropical Pacific to increased CO2 in a coupled ocean-atmosphere model. J Clim 8:2181–2199CrossRefGoogle Scholar
  24. Levine XJ, Boos WR (2016) A mechanism for the response of the zonally asymmetric subtropical hydrologic cycle to global warming. J Clim 29:7851–7867CrossRefGoogle Scholar
  25. Li X, Ting M (2017) Understanding the Asian summer monsoon response to greenhouse warming: the relative roles of direct radiative forcing and sea surface temperature change. Clim Dyn 49:2863–2880CrossRefGoogle Scholar
  26. Li W, Li L, Ting M, Liu Y (2012) Intensification of Northern Hemisphere subtropical highs in a warming climate. Nat Geosci 5:830–834CrossRefGoogle Scholar
  27. Li X, Ting M, Li C, Henderson N (2015) Mechanisms of Asian summer monsoon changes in response to anthropogenic forcing in CMIP5 models. J Clim 28:4107–4125CrossRefGoogle Scholar
  28. Liu Y, Wu G, Ren R (2004) Relationship between the subtropical anticyclone and diabatic heating. J Clim 17:682–698CrossRefGoogle Scholar
  29. Ma J, Xie SP (2013) Regional patterns of sea surface temperature change: a source of uncertainty in future projections of precipitation and atmospheric circulation. J Clim 26:2482–2501CrossRefGoogle Scholar
  30. Ma J, Yu JY (2014) Paradox in South Asian summer monsoon circulation change: lower tropospheric strengthening and upper tropospheric weakening. Geophys Res Lett 41:2934–2940CrossRefGoogle Scholar
  31. Ma J, Xie SP, Kosaka Y (2012) Mechanisms for tropical tropospheric circulation change in response to global warming. J Clim 25:2979–2994CrossRefGoogle Scholar
  32. Merlis TM, Schneider T (2011) Changes in zonal surface temperature gradients and Walker circulations in a wide range of climates. J Clim 24:4757–4768CrossRefGoogle Scholar
  33. Muller CJ, O’Gorman PA (2011) An energetic perspective on the regional response of precipitation to climate change. Nat Clim Change 1:266–271CrossRefGoogle Scholar
  34. Neelin JD (2007) The global circulation of the atmosphere, chapter 10. Moist dynamics of tropical convection zones in monsoons, teleconnections, and global warming. Princeton University Press, Princeton, pp 267–301Google Scholar
  35. Neelin JD, Yu JY (1994) Modes of tropical variability under convective adjustment and the Madden–Julian oscillation. Part I: analytical theory. J Atmos Sci 51:1876–1894CrossRefGoogle Scholar
  36. Neelin JD, Zeng N (2000) A quasi-equilibrium tropical circulation model-formulation. J Atmos Sci 57:1741–1766CrossRefGoogle Scholar
  37. O’Gorman PA, Allan RP, Byrne MP, Previdi M (2012) Energetic constraints on precipitation under climate change. Surv Geophys 33:585–608CrossRefGoogle Scholar
  38. Reid GC, Gage KS (1981) On the annual variation in height of the tropical tropopause. J Atmos Sci 38:1928–1938CrossRefGoogle Scholar
  39. Rodwell MJ, Hoskins BJ (1996) Monsoons and the dynamics of deserts. Q J R Meteorol Soc 122:1385–1404CrossRefGoogle Scholar
  40. Rodwell MJ, Hoskins BJ (2001) Subtropical anticyclones and summer monsoons. J Clim 14:3192–3211CrossRefGoogle Scholar
  41. Scheff J, Frierson DMW (2012) Robust future precipitation declines in CMIP5 largely reflect the poleward expansion of model subtropical dry zones. Geophys Res Lett 39:L18704Google Scholar
  42. Schneider T, O’Gorman PA, Levine XJ (2010) Water vapor and the dynamics of climate changes. Rev Geophys 48:RG3001CrossRefGoogle Scholar
  43. Seager R, Naik N, Vecchi GA (2010) Thermodynamic and dynamic mechanisms for large-scale changes in the hydrological cycle in response to global warming. J Clim 23:4651–4668CrossRefGoogle Scholar
  44. Seager R, Liu H, Henderson N, Simpson I, Kelley C, Shaw T, Kushnir Y, Ting M (2014a) Causes of increasing aridification of the Mediterranean region in response to rising greenhouse gases. J Clim 27:4655–4676CrossRefGoogle Scholar
  45. Seager R, Neelin D, Simpson I, Isla H, Liu N, Henderson T, Shaw Y, Ting Kushnir M, Cook B (2014b) Dynamical and thermodynamical causes of large-scale changes in the hydrological cycle over North America in response to global warming. J Clim 27:7921–7948CrossRefGoogle Scholar
  46. Shaw TA, Voigt A (2015) Tug of war on summertime circulation between radiative forcing and sea surface warming. Nat Geosci 8:560–566CrossRefGoogle Scholar
  47. Shaw TA, Voigt A (2016a) Land dominates the regional response to CO2 direct radiative forcing. Geophys Res Lett 43:11383–11391CrossRefGoogle Scholar
  48. Shaw TA, Voigt A (2016b) Understanding the links between subtropical and extratropical circulation responses to climate change using aquaplanet model simulations. J Clim 29:6637–6657CrossRefGoogle Scholar
  49. Singh MS, O’Gorman PA (2012) Upward shift of the atmospheric general circulation under global warming: theory and simulations. J Clim 25:8259–8276CrossRefGoogle Scholar
  50. Sun Y, Ding Y (2011) Responses of South and East Asian summer monsoons to different land-sea temperature increases under a warming scenario. Chin Sci Bull 56:2718–2726CrossRefGoogle Scholar
  51. Sun Y, Ding Y, Dai A (2010) Changing links between South Asian summer monsoon circulation and tropospheric land-sea thermal contrasts under a warming scenario. Geophys Res Lett 37:L02704Google Scholar
  52. Tanaka HL, Ishizaki N, Kitoh A (2004) Trend and interannual variability of Walker, monsoon and Hadley circulations defined by velocity potential in the upper troposphere. Tellus A 56:250–269CrossRefGoogle Scholar
  53. Taylor KE, Stouffer RJ, Meehl GA (2012) An overview of CMIP5 and the experiment design. Bull Am Meteorol Soc 93:485–498CrossRefGoogle Scholar
  54. Ting M (1994) Maintenance of northern summer stationary waves in a GCM. J Atmos Sci 51:3286–3308CrossRefGoogle Scholar
  55. Tokinaga H, Xie SP, Deser C, Kosaka Y, Okumura YM (2012) Slowdown of the Walker circulation driven by tropical Indo-Pacific warming. Nature 491:439–443CrossRefGoogle Scholar
  56. Trenberth KE, Stepaniak DP, Caron JM (2000) The global monsoon as seen through the divergent atmospheric circulation. J Clim 13:3969–3993CrossRefGoogle Scholar
  57. Tyrlis E, Lelieveld J, Steil B (2013) The summer circulation over the eastern Mediterranean and the Middle East: influence of the South Asian monsoon. Clim Dyn 40:1103–1123CrossRefGoogle Scholar
  58. Ueda H, Iwai A, Kuwako K, Hori ME (2006) Impact of anthropogenic forcing on the Asian summer monsoon as simulated by eight GCMs. Geophys Res Lett 33:L06703CrossRefGoogle Scholar
  59. Vecchi GA, Soden BJ (2007) Global warming and the weakening of the tropical circulation. J Clim 20:4316–4340CrossRefGoogle Scholar
  60. Wang H, Ting M (1999) Seasonal cycle of the climatological stationary waves in the NCEP-NCAR reanalysis. J Atmos Sci 56:3892–3919CrossRefGoogle Scholar
  61. Webster PJ (1972) Response of the tropical atmosphere to local, steady forcing. Mon Weather Rev 100:518–541CrossRefGoogle Scholar
  62. Wills RC, Schneider T (2015) Stationary eddies and the zonal asymmetry of net precipitation and ocean freshwater forcing. J Clim 28:5115–5133CrossRefGoogle Scholar
  63. Wills RC, Levine XJ, Schneider T (2017) Local energetic constraints on Walker circulation strength. J Atmos Sci 74:1907–1922CrossRefGoogle Scholar
  64. Xie SP, Deser C, Vecchi GA, Ma J, Teng H, Wittenberg AT (2010) Global warming pattern formation: sea surface temperature and rainfall. J Clim 23:966–986CrossRefGoogle Scholar
  65. Yang F, Kumar A, Schlesinger ME, Wang W (2003) Intensity of hydrological cycles in warmer climates. J Clim 16:2419–2423CrossRefGoogle Scholar
  66. Yu J-Y, Chou C, Neelin JD (1998) Estimating the gross moist stability of the tropical atmosphere. J Atmos Sci 55:1354–1372CrossRefGoogle Scholar
  67. Zhou T, Yu R, Zhang J, Drange H, Cassou C, Deser C, Hodson DLR, Sanchez-Gomez E, Li J, Keenlyside N, Xin X et al (2009) Why the western Pacific subtropical high has extended westward since the late 1970s. J Clim 22:2199–2215CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Barcelona Supercomputing CenterBarcelonaSpain
  2. 2.Department of Earth and Planetary ScienceUniversity of California, BerkeleyBerkeleyUSA
  3. 3.Climate and Ecosystem Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyUSA

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