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Chinese Science Bulletin

, Volume 54, Issue 24, pp 4724–4732 | Cite as

The responses of East Asian Summer monsoon to the North Atlantic Meridional Overturning Circulation in an enhanced freshwater input simulation

  • Lei Yu
  • YongQi GaoEmail author
  • HuiJun Wang
  • Dong Guo
  • ShuangLin Li
Articles / Atmospheric Science

Abstract

We investigated the response of the East Asian Summer Monsoon (EASM) to a weakened Atlantic Meridional Overturning Circulation (AMOC) and its mechanism in an enhanced freshwater input experiment (FW) by using a fully-coupled climate model. The response was a weakened EASM and the mechanisms can be explained as follows. The simulated weakened AMOC resulted in a drop in sea surface temperature (SST) in the North Atlantic (NA) and, correspondingly, an anomalous high sea level pressure (SLP) over the North American regions, which in turn increased the northeast surface winds across the equator in the eastern tropical Pacific (ETP). The anomalous northeast winds then induced further upwelling in the ETP and stronger air/sea heat exchange, therefore leading to an anomalous cooling of the eastern tropical sea surface. As a result, the climatologic Hadley Circulation (HC) was weakened due to an anomalous stronger sinking of air in the ETP north of the equator, whereas the Walker Circulation (WC) in the western tropical Pacific (WTP) north of the equator was strengthened with an eastward-shifted upwelling branch. This feature was in agreement with the anomalous convergent winds in the WTP, and led to a weakened EASM and less East Asian summer precipitation (EASP). Furthermore, comparison with previous freshwater experiments indicates that the strength of EASP could be influenced by the magnitude of the added freshwater.

Keywords

East Asian Summer Monson freshwater AMOC Hadley Circulation Walker Circulation 

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References

  1. 1.
    Trenberth K E, and Caron J M. Estimates of the meridional atmosphere and ocean heat transport. J Clim, 2001, 14: 3433–3443CrossRefGoogle Scholar
  2. 2.
    Broecker W S. The great ocean conveyor. Oceanography, 1991, 4: 79–89Google Scholar
  3. 3.
    Dansgaard W. Evidence for general instability in past climate from a 250-kyr ice-core record. Nature, 1993, 364: 218–220CrossRefGoogle Scholar
  4. 4.
    Clark P U, Pisias N G, Stocker T F, et al. The role of the thermohaline circulation in abrupt climate change. Nature, 2002, 415: 863–869CrossRefGoogle Scholar
  5. 5.
    MacManus J F, Francols R, Gherardi J M, et al. Collapse and rapid resumption of Atlantic Meridional Circulation linked to deglacial climate changes. J Clim, 2005, 18: 1853–1860CrossRefGoogle Scholar
  6. 6.
    Zhou T J, Wang S W. Preliminary evaluation on the decadal scale variability of the North Atlantic thermohaline circulation during 20th Century (in Chinese). Clim Environ Res, 2001, 6: 294–303Google Scholar
  7. 7.
    Zhou T J, Yu R C, Liu X Y, et al. Weak response of the Atlantic thermohaline circulation to an increase of atmospheric carbon dioxide in IAP/LASG Climate System Model. Chinese Sci Bull, 2005, 50: 592–598Google Scholar
  8. 8.
    Wang S W, Huang J B. The variations of geographical latitude of rain belts in summer over Eastern China during the last millennium (in Chinese). Adv Clim Change Res, 2006, 2: 117–127Google Scholar
  9. 9.
    Schulz H, Rad V, Erlenkeuser H. Correlation between Arabian Sea and Greenland climate oscillations of the past 110,000 years. Nature, 1998, 393: 54–57Google Scholar
  10. 10.
    Wang Y J, Cheng H, Edwards R L, et al. A high-resolution absolute-dated late Pleistocene monsoon record from Hulu Cave, China. Science, 2001, 294: 2345–2348, doi: 10.1126/science.1064618CrossRefGoogle Scholar
  11. 11.
    Lyle M, Mitchell N, Pisias N, et al. Do geochemical estimates of sediment focusing pass the sediment test in the equatorial Pacific? Paleoceanography, 2005, 20: PA1005, doi:10.1029/2004PA001019CrossRefGoogle Scholar
  12. 12.
    Wang Y, Li S, Luo D. Seasonal response of Asian monsoonal climate to the Atlantic Multidecadal Oscillation(AMO). J Geophys Res, 2009, 114: D02112, doi:10.1029/2008JD010929CrossRefGoogle Scholar
  13. 13.
    Goswami B N, Madhusoodanan M S, Neema C P, et al. A physical mechanism for North Atlantic SST influence on the Indian summer monsoon. Geophys Res Lett, 2006, 3: L02706, doi:10.1029/2005GL024803CrossRefGoogle Scholar
  14. 14.
    Li S, Perlwitz J, Quan X, et al. Modelling the influence of North Atlantic multidecadal warmth (AMO) on the Indian summer rainfall. Geophys Res Lett, 2008, 35: L05804, doi:10.1029/2007GL032901CrossRefGoogle Scholar
  15. 15.
    Li S, Ji L, Zhang D, et al. Impact of the heating over South Asia upon the subtropical high over the West Pacific (in Chinese). J Trop Meteol, 1999, 15: 100–119Google Scholar
  16. 16.
    Zhang R T, Delworth L. Simulated tropical response to a substantial weakening of the Atlantic Thermohaline Circulation. J Clim, 2004, 428: 834–837Google Scholar
  17. 17.
    Lu R, Dong B. Response of the Asian Summer Monsoon to Weakening of Atlantic Thermohaline Circulation. Adv Atmos Sci, 2008, 25: 723–736CrossRefGoogle Scholar
  18. 18.
    Vellinga M, Wood R A. Global climate impacts of a collapse of the Atlantic thermohaline circulation. Clim Change, 2002, 54: 251–267CrossRefGoogle Scholar
  19. 19.
    Dahl K A, Broccoli A J, Stouffer R. Assessing the role of North Atlantic freshwater forcing in millennial scale climate variability: A tropical Atlantic perspective. Clim Dyn, 2005, 24: 325–346CrossRefGoogle Scholar
  20. 20.
    Furevik T, Bentsen M, Drange H, et al. Description and validation of the Bergen Climate Model: ARPEGE coupled with MICOM. Clim Dyn, 2003, 21: 27–51CrossRefGoogle Scholar
  21. 21.
    Manabe S, Stouffer R J. Multiple-century response of a coupled ocean-atmosphere model to an increase of atmospheric carbon dioxide. J Clim, 1994, 7: 5–23CrossRefGoogle Scholar
  22. 22.
    Otterå O H, Drange H, Bentsen M, et al. Transient response of the Atlantic Meridional Overturning Circulation to enhanced freshwater input to the Nordic Seas-Arctic Ocean in the Bergen Climate Model. Tellus, 2004, 56A: 342–361Google Scholar
  23. 23.
    Kuhlbrodt T, Griesel A, Montoya M, et al. On the driving processes of the Atlantic Meridional Overturning Circulation. Rev Geophys, 2007, 45: RG2001/2004CrossRefGoogle Scholar
  24. 24.
    Yu L, Gao Y, Wang H, et al. Revisiting effect of ocean diapycnal mixing on Atlantic Meridional Overturning Circulation recovery in a freshwater perturbation simulation. Adv Atmos Sci, 2008, 25: 597–609CrossRefGoogle Scholar
  25. 25.
    Yu L, Gao Y, Wang H, et al. Transient response of Atlantic Meridional Overturning Circulation to the enhanced freshwater forcing and its mechanism (in Chinese). Chin J Atmos Sci, 2009, 33: 179–197Google Scholar
  26. 26.
    Randall D A, Wood R A, Bony S, et al. Climate Models and Their Evaluation. In: Solomon S, Qin D, Manning M, et al., eds. Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, United Kingdom and New York: Cambridge University Press, 2007. 612Google Scholar
  27. 27.
    Wang H J. The instability of the East Asian Summer Monsoon-ENSO relations. Adv Atmos Sci, 2002, 19: 2–11Google Scholar
  28. 28.
    Rahmstorf S, Ganopolski A. Long-term global warming scenarios computed with efficient coupled climate model. Clim Change, 1999, 43: 353–367CrossRefGoogle Scholar
  29. 29.
    Jiang S C, Qian Y E, Yang X F, et al. Climateological features of the global tropical subsidence region based on satellite observations. Adv Atmos Sci, 2000, 17: 391–402CrossRefGoogle Scholar
  30. 30.
    Qian W, Zhu Y, Xie A, et al. Seasonal and interannual variation pf upper troposphere water vapor band brightness temperature over the global monsoon regions. Adv Atmos Sci, 1998, 15: 337–345CrossRefGoogle Scholar
  31. 31.
    Murakami T. Empirical orthogonal function analysis of satelliteobserved outgoing radiation during summer. Mon Weather Rev, 1980, 18: 205–222CrossRefGoogle Scholar
  32. 32.
    Jiang S C. On diaganositic study of drought-flood in Yangtze River by meterologic satellite (in Chinese). Chinese Sci Bull, 1992, 37: 1779–1784Google Scholar
  33. 33.
    Ge X. The climatic features of tropical walker circulation retrieved by multi-channel of satellite data and its relationship of summer rainfall pattern in China. J Trop Meteol, 2002, 18: 182–187Google Scholar
  34. 34.
    Zhang L P, Ding Y H, Cheng Z H, et al. Association between global OLR and summer rainfall over the middle reach of Yangtze River. Acta Meteol Sin, 2007, 65: 75–83Google Scholar
  35. 35.
    Altabet M A, Higginson M J, Murray D W. The effect of millennial-scale changes in Arabian Sea denitrification on atmospheric CO2. Nature, 2002, 415: 159–162CrossRefGoogle Scholar
  36. 36.
    Saenko O A, Schmittner A, Weaver A J. The Atlantic-Pacific seesaw. J Clim, 2004, 17: 2033–2038CrossRefGoogle Scholar

Copyright information

© Science in China Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • Lei Yu
    • 1
  • YongQi Gao
    • 1
    • 2
    Email author
  • HuiJun Wang
    • 1
  • Dong Guo
    • 1
    • 3
  • ShuangLin Li
    • 1
  1. 1.Nansen-Zhu International Research Center, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Nansen Environmental and Remote Sensing Center/Bjerknes Centre for Climate ResearchBergenNorway
  3. 3.Sate Key Laboratory of Earth Surface Processes and Resource Ecology, Academy of Disaster Reduction and Emergency ManagementBeijing Normal UniversityBeijingChina

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