Abstract
The atmospheric circulation response to decadal fluctuations of the Atlantic meridional overturning circulation (MOC) in the IPSL climate model is investigated using the associated sea surface temperature signature. A SST anomaly is prescribed in sensitivity experiments with the atmospheric component of the IPSL model coupled to a slab ocean. The prescribed SST anomaly in the North Atlantic is the surface signature of the MOC influence on the atmosphere detected in the coupled simulation. It follows a maximum of the MOC by a few years and resembles the model Atlantic multidecadal oscillation. It is mainly characterized by a warming of the North Atlantic south of Iceland, and a cooling of the Nordic Seas. There are substantial seasonal variations in the geopotential height response to the prescribed SST anomaly, with an East Atlantic Pattern-like response in summer and a North Atlantic oscillation-like signal in winter. In summer, the response of the atmosphere is global in scale, resembling the climatic impact detected in the coupled simulation, albeit with a weaker amplitude. The zonally asymmetric or eddy part of the response is characterized by a trough over warm SST associated with changes in the stationary waves. A diagnostic analysis with daily data emphasizes the role of transient-eddy forcing in shaping and maintaining the equilibrium response. We show that in response to an intensified MOC, the North Atlantic storm tracks are enhanced and shifted northward during summer, consistent with a strengthening of the westerlies. However the anomalous response is weak, which suggests a statistically significant but rather modest influence of the extratropical SST on the atmosphere. The winter response to the MOC-induced North Atlantic warming is an intensification of the subtropical jet and a southward shift of the Atlantic storm track activity, resulting in an equatorward shift of the polar jet. Although the SST anomaly is only prescribed in the Atlantic ocean, significant impacts are found globally, indicating that the Atlantic ocean can drive a large scale atmospheric variability at decadal timescales. The atmospheric response is highly non-linear in both seasons and is consistent with the strong interaction between transient eddies and the mean flow. This study emphasizes that decadal fluctuations of the MOC can affect the storm tracks in both seasons and lead to weak but significant dynamical changes in the atmosphere.
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Notes
Because of the short observed timeseries of SST changes, it is difficult to identify an oscillation and thus the AMO is also referred to as the Atlantic multidecadal variability (AMV).
This is not a particularity of the IPSL model as in several climate models the surface signature of the MOC is strongest at high latitudes and weak in the tropics.
References
Alexander MA, Scott JD, Deser C (2000) Processes that influence sea surface temperature and ocean mixed layer depth variability in a coupled model. J Geophys Res 105:16823–16842
Barsugli JJ, Battisti DS (1998) The basic effects of atmosphere-ocean thermal coupling on midlatitude variability. J Atmos Sci 55:477–493
Bjerknes J (1964) Atlantic air-sea interaction. Adv Geophys 10:1–82
Branstator G (1992) The maintenance of low frequency atmospheric anomalies. J Atmos Sci 49:1924–1945
Branstator G (2002) Circumglobal teleconnections, the jet stream waveguide, and the North Atlantic oscillation. J Clim 15:1893–1910
Cassou C, Deser C, Alexander MA (2007) Investigating the impact of reemerging sea surface temperature anomalies on the winter atmospheric circulation over the North Atlantic. J Clim 20:3510–3526
Cassou C, Sanchez E, Hodson DLR, Keenlyside N, Okumura YM, Zhou T, Sutton R (2009) Respective forcing of the Indian ocean and western Pacific warming on the northern hemisphere atmospheric circulation. J Clim (in preparation)
Collins M, Botzet M, Carril AF, Drange H, Jouzeau A, Latif M, Masina S, Otteraa OH, Pohlmann H, Sorteberg A, Sutton R, Terray L (2006) Interannual to decadal climate predictability in the North Atlantic: a multimodel-ensemble study. J Clim 19:1195–1203
Conil S, Li ZX (2005) Linearity of the atmospheric response to North Atlantic sst and sea ice anomalies. J Clim 18:1986–2003
Danabasoglu G (2008) On multi-decadal variability of the Atlantic meridional overturning circulation in the Community Climate System Model Version 3 (CCSM3). J Clim 21:5524–5544
Delworth TL, Mann ME (2000) Observed and simulated multidecadal variability in the northern hemisphere. Clim Dyn 16:661–676
Delworth TL, Manabe S, Stouffer RJ (1993) Interdecadal variations of the thermohaline circulation in a coupled ocean-atmosphere model. J Clim 6:1993–2011
Deser C, Magnusdottir G, Saravanan R, Phillips A (2004) The effects of North Atlantic sst and sea ice anomalies on the winter circulation in CCM3. Part II: direct and indirect components of the response. J Clim 17:877–889
Dong B, Sutton RT (2005) Mechanism of interdecadal thermohaline circulation variability in a coupled ocean-atmosphere gcm. J Clim 18:1117–1135
Drévillon M, Terray L, Rogel P, Cassou C (2001) Mid latitude Atlantic sst influence on European winter climate variability in the NCEP reanalysis. Clim Dyn 18:331–344
Fraedrich K, Bantzer C, Burkhardt U (1993) Winter climate anomalies in Europe and their associated circulation at 500 hpa. Clim Dyn 8:161–175
Frankignoul C (1985) Sea surface temperature anomalies, planetary waves and air-sea feedback in the middle latitudes. Rev Geophys 23:357–390
Frankignoul C, Sennechael N (2007) Observed influence of North Pacific SST anomalies on the atmospheric circulation. J Clim 20:1179
Fu Q, Johanson CM, Wallace JM, Reichler T (2006) Enhanced mid-latitude tropospheric warming in satellite measurements. Sci Agric 312:592–606
Goldenberg SB, Landsea CW, nez AMMN, Gray WM (2001) The recent increase in Atlantic hurricane activity: causes and implications. Sci Agric 293:474–479
Goswami BN, Madhusoodanan MS, Neema CP, Sengupta D (2006) A physical mechanism for North Atlantic SST influence on the Indian summer monsoon. Geophys Res Lett 33:L02706. doi:10.1029/2005GL024803
Hodson DLR, Sutton RT, Cassou C, Keenlyside N, Okumura Y, Zhou T (2009) Climate impacts of recent multidecadal changes in Atlantic ocean sea surface temperature: a multimodel comparison. Clim Dyn. doi:10.1007/s00382-009-0571-2
Holopainen E (1984) Statistical local effect of synoptic scale transient eddies on time mean flow in the northern extratropics in winter. J Atmos Sci 41:2505–2515
Hoskins BJ, James IN (1983) The shape, propagation and mean flow interaction of large-scale weather systems. J Atmos Sci 40:1595–1612
Hoskins BJ, Karoly D (1981) The steady linear response of a spherical atmosphere to thermal and orographic forcing. J Atmos Sci 38:1179–1196
Hoskins BJ, Valdes PJ (1990) On the existence of storm tracks. J Atmos Sci 47:1854–1864
Hourdin F, Musat I, Bony S, Braconnot P, Codron F, Dufresne JL, Fairhead L, Filiberti MA, Friedlingstein P, Grandpeix JY, Krinner G, Van PL, Li ZX, Lott F (2006) The LMDZ4 general circulation model: climate performance and sensitivity to parametrized physics with emphasis on tropical convection. Clim Dyn 27:787–813
Jungclaus JH, Haak H, Latif M, Mikolajewicz U (2005) Arctic North Atlantic interactions and multidecadal variability of the meridional overturning circulation. J Clim 18:4013–4031
Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Leetmaa A, Reynolds R, Jenne R, Joseph D (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Met Soc 77:437–471
Kerr RA (2000) A North Atlantic climate pacemaker for the centuries. Sci Agric 288:1984–1985
Knight JR (2009) The Atlantic multidecadal oscillation inferred from the forced climate response in coupled general circulation models. J Clim 22:1610–1625
Knight JR, Allan RJ, Folland CK, Vellinga M, Mann ME (2005) A signature of persistent natural thermohaline circulation cycles in observed climate. Geophys Res Lett 32:L20708. doi:10.1029/2005GL024233
Knight JR, Folland CK, Scaife AA (2006) Climate impacts of the Atlantic multidecadal oscillation. Geophys Res Lett 33:1605–1614
Kucharsky F, Bracco A, Yoo JH, Molteni F (2007) Low frequency variability of the Indian Monsoon-ENSO relationship and the tropical Atlantic: the “weakening” of the 1980s and 1990s. J Clim 20:4255–4266
Kucharsky F, Bracco A, Yoo JH, Molteni F (2008) Atlantic forced component of the Indian monsoon interannual variability. Geophys Res Lett 35:L04706. doi:10.1029/2007GL033037
Kushnir Y (1994) Interdecadal variations in North Atlantic sea surface temperature and associated atmospheric conditions. J Clim 7:141–157
Kushnir Y, Lau NC (1992) The general circulation model response to a North Pacific SST anomaly: dependence on timescale and pattern polarity. J Clim 5:271–283
Kushnir Y, Robinson W, Blade I, Hall NMJ, Peng S, Sutton R (2002) Atmospheric GCM response to extratropical SST anomalies: synthesis and evaluation. J Clim 15:2233–2256
Kushnir Y, Seager R, Ting M, Naik N, Nakamura J (2010) Mechanisms of tropical Atlantic SST influence on North American hydroclimate variability. J Clim (to appear)
Latif M, Roeckner E, Botzet M, Esch M, Haak H, Hagemann S, Jungclaus J, Legutke S, Marsland S, Mikolajewicz U (2004) Reconstructing, monitoring, and predicting multidecadal-scale changes in the North Atlantic thermohaline circulation with sea surface temperature. J Clim 17:1605–1614
Latif M, Collins M, Pohlmann H, Keenlyside N (2006) A review of predictability studies of Atlantic sector climate on decadal time scales. J Clim 19:5971–5987
Lau NC (1988) Variability of the observed midlatitude storm tracks in relation to low-frequency changes in the circulation pattern. J Atmos Sci 45:2718–2743
Lau NC, Leetmaa A, Nath MJ, Wang HL (2005) Influences of ENSO-induced Indo-Western Pacific SST anomalies on extratropical atmospheric variability during the boreal summer. J Clim 18:2922–2942
Lee DE, Liu Z, Liu Y (2008) Beyon thermal interaction between ocean and atmosphere: on the extratropical climate variability due to wind-induced SST. J Clim 21:2001–2018
Livezey RE, Chen WY (1983) Statistical field significance and its determination by monte carlo techniques. Mon Weather Rev 111:46–59
Magnusdottir G, Deser C, Saravanan R (2004) The effects of North Atlantic sst and sea ice anomalies on the winter circulation in CCM3. Part I: main features and storm tracks characteristics of the response. J Clim 17:857–876
Marti O, Braconnot P, Bellier J, Benshila R, Bony S, Brockmann P, Cadule P, Caubel A, Denvil S, Dufresne J-L, Fairhead L, Filiberti M-A, Foujols M-A, Fichefet T, Friedlingstein P, Gosse H, Grandpeix J-Y, Hourdin F, Krinner G, Lévy C, Madec G, Musat I, de Noblet N, Polcher J, Talandier C (2006) The new IPSL Climate System Model: IPSL-CM4. Note du Pôle de modélisation 26
Marti O, Braconnot P, Dufresne JL, Bellier J, Benshila R, Bony S, Brockmann P, Cadule P, Caubel A, Codron F, de Noblet N, Denvil S, Fairhead L, Fichefet T, Foujols MA, Friedlingstein P, Goosse H, Grandpeix JY, Guilyardi E, Hourdin F, Krinner G, Lévy C, Madec G, Mignot J, Musat I, Swingedouw D, Talandier C (2010) Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution. Clim Dyn 34:1–26. doi:10.1007/s00382-009-0640-6
Msadek R, Frankignoul C (2009) Atlantic multidecadal oceanic variability and its influence on the atmosphere in a climate model. Clim Dyn 33:45–62. doi:10.1007/s00382-008-0452-0
Msadek R, Dixon KW, Delworth TL, Hurlin W (2010) Assessing the predictability of the Atlantic meridional overturning circulation and associated fingerprints. Geophys Res Lett 37. doi:10.1029/2010GL044517
Norris JR, Zhang Y, Wallace JM (1998) Role of low clouds in summertime atmosphere-ocean interactions over the North Pacific. J Clim 11:2482–2490
Okumura YM, Deser C, Hu A, Timmermann A, Xie SP (2009) North Pacific climate response to freshwater forcing in the subarctic North Atlantic: oceanic and atmospheric pathways. J Clim 22:1424–1445
Palmer TN, Sun Z (1985) A modelling and observational study of the relationship between sea surface temperature in the northwest Atlantic and the atmospheric general circulation. Q J R Meteorol Soc 111:947–975
Pardaens A, Vellinga M, Wu P, Ingleby B (2008) Large scale Atlantic salinity changes over the last half-century: a model-observation comparison. J Clim 21:1698–1720
Park S, Deser C, Alexander MA (2005) Estimation of the surface heat flux response to sea surface temperature anomalies over the global oceans. J Clim 18:4582–4599
Peng S, Robinson WA (2001) Relationship between atmospheric internal variability and the responses to an extratropical SST anomaly. J Clim 14:2943–2959
Peng S, Whitaker JS (1999) Mechanisms determining the atmospheric response to midlatitude SST anomalies. J Clim 12:1393–1408
Peng S, Mysak LA, Ritchie H, Derome J, Dugas B (1995) The differences between early and midwinter atmospheric responses to sea surface temperature anomalies in the northwest Atlantic. J Clim 8:137–157
Peng S, Robinson WA, Hoerling MP (1997) The modeled atmospheric response to midlatitude SST anomalies and its dependence on background circulation states. J Clim 10:971–987
Peng S, Robinson WA, Li S (2003) Mechanisms for the NAO responses to the North Atlantic SST tripole. J Clim 16:1987–2004
Peng S, Robinson WA, Li S, Hoerling MP (2005) Tropical Atlantic SST forcing of coupled North Atlantic seasonal responses. J Clim 18:480–496
Peng S, Robinson WA, Li S, Alexander MA (2006) Effects of Ekman transport on the NAO response to a tropical Atlantic SST anomaly. J Clim 19:4803–4818
Plumb RA (1985) On the three-dimensional propagation of stationary waves. J Atmos Sci 42:217–229
Schubert S, Gutzler D, Wang H, Dai A, Delworth T, Deser C, Findell K, Fu R, Higgins W, Hoerling M, Kirtmann B, Koster R, Kumar A, Legler D, Lettenmaier D, Lyon B, Magana V, Mo K, Nigam S, Pegion P, Phillips A, Pulwarty R, Rind D, Ruiz-Barradas A, Schem J, Seager R, Stewart E, Suarez M, Syktus J, Ting M, Wang C, Weaver S, Zeng N (2009) A USCLIVAR project to assess and compare the responses of global climate models to drough-related SST forcing patterns: overview and results. J Clim (revised)
Storch HV, Zwiers FW (1999) Statistical analysis in climate research. Cambridge University Press, London
Sutton RT, Hodson DLR (2005) Atlantic ocean forcing of North American and European summer climate. Science 309:115–118
Sutton RT, Hodson DLR (2007) Climate response to basin-scale warming and cooling of the North Atlantic ocean. J Clim 20:891–907
Sutton RT, Mathieu PP (2002) Response of the atmosphere-ocean mixed-layer system to anomalous ocean heat flux convergence. Q J R Meteorol Soc 128:1259–1275
Timmermann A, Latif M, Voss R, Grotzner A (1998) Northern hemispheric interdecadal variability: a coupled air-sea mode. J Clim 11:1906–1931
Timmermann A, Okumura Y, An SI, Clement A, Dong B, Guilyardi E, Hu A, Jungclaus JH, Renold M, Stocker TF, Stouffer RJ, Sutton R, Xie SP, Yin J (2007) Northern hemispheric interdecadal variability: a coupled air-sea mode. J Clim 20:4899–4919
Ting M, Peng S (1995) Dynamics of the early and middle winter atmospheric response to the northwest Atlantic SST anomalies. J Clim 8:2239–2254
Ting M, Kushnir Y, Seager R, Li C (2009) Forced and internal twentieth-century SST trends in the North Atlantic. J Clim 22:1469–1481
Trenberth KE (1986) An assessment of the impact of transient eddies on the zonal flow during a blocking episode using localized Eliassen-Palm flux diagnostics. J Atmos Sci 43:2070–2087
Wilks DS (1997) Resampling hypothesis tests for autocorrelated fields. J Clim 10:65–82
Zhang R, Delworth TL (2006) Impact of the Atlantic multidecadal oscillations on India/Sahel rainfall and Atlantic hurricanes. Geophys Res Lett 33:L17712. doi:10.1029/2006GL026267
Acknowledgments
The authors thank Christophe Cassou, Jérome Sirven, Isaac Held, Ying Li, and two anonymous reviewers for useful comments on earlier versions of this manuscript. Computer resources were allocated by IDRIS, the computer center of the CNRS in Paris. The research leading to these results has received funding from the European Community’s 7th framework programme (FP7/2007-1013) under grant agreement No. GA212643 (THOR: “Thermohaline Overturning-at Risk”, 2008–2012. Support to CF from the Institut Universitaire de France, is gratefully acknowledged.
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Msadek, R., Frankignoul, C. & Li, L.Z.X. Mechanisms of the atmospheric response to North Atlantic multidecadal variability: a model study. Clim Dyn 36, 1255–1276 (2011). https://doi.org/10.1007/s00382-010-0958-0
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DOI: https://doi.org/10.1007/s00382-010-0958-0