Interannual relations between South American rainfall and tropical sea surface temperature anomalies before and after 1976

The differences between 1948–1976 and 1977–2002 periods in the interannual relationships of South American precipitation with sea surface temperature (SST) indices in selected oceanic sectors are documented using correlation analyses. For the total correlation between the eastern equatorial Pacific (EEP) and tropical South Atlantic (TSA) indices and the precipitation, the differences between the two periods reflect, in part, the El Nino-Southern Oscillation (ENSO) teleconnections over South America, with the Pacific decadal oscillation (PDO) background acting to enhance (weaken) the correlations when ENSO and PDO are in the same (opposite) phase. For the total correlation between the tropical North Atlantic (TNA) and southwest South Atlantic (SWA) indices and precipitation, the results here suggest that the differences between the two periods might be reflected as variations in the Bolivian high-pressure system. Both the TNA and TSA indices may act to weaken the positive ENSO relations with precipitation over central and eastern Brazil during the cold PDO phase. These analyses provide indications that the ENSO relationship with the TSA shows differences between the two analysed periods. Copyright © 2008 Royal Meteorological Society

[1]  S. Hastenrath,et al.  Dynamics of climatic hazards in northeast Brazil , 1977 .

[2]  R. Andreoli,et al.  Relations of South American summer rainfall interannual variations with the Pacific Decadal Oscillation , 2007 .

[3]  M. Cane,et al.  Interannual Variability of Caribbean Rainfall, ENSO, and the Atlantic Ocean* , 2000 .

[4]  L. Mysak,et al.  Atmosphere–Ocean Coupled Variability in the South Atlantic , 1997 .

[5]  V. Barros,et al.  Climate Variability in Southern South America Associated with El Niño and La Niña Events. , 2000 .

[6]  J. Janowiak,et al.  Global Land Precipitation: A 50-yr Monthly Analysis Based on Gauge Observations , 2002 .

[7]  C. Deser,et al.  Upper-Ocean Thermal Variations in the North Pacific during 1970–1991 , 1996 .

[8]  J. Gomes,et al.  Precipitation Anomalies in Southern Brazil Associated with El Niño and La Niña Events , 1998 .

[9]  L. Greischar,et al.  Circulation mechanisms related to northeast Brazil rainfall anomalies , 1993 .

[10]  Yves M. Tourre,et al.  Characteristics of Low-Frequency Sea Surface Temperature Fluctuations in the Tropical Atlantic , 1992 .

[11]  C. F. Ropelewski,et al.  Precipitation Patterns Associated with the High Index Phase of the Southern Oscillation , 1989 .

[12]  K. Lau,et al.  Principal modes of interannual and decadal variability of summer rainfall over South America , 2001 .

[13]  A. Robertson,et al.  Seasonal Dependence of ENSO Teleconnections over South America and Relationships with Precipitation in Uruguay , 2003 .

[14]  Vadlamudi Brahmananda Rao,et al.  Tropical circulations and the associated rainfall anomalies during two contrasting years , 1988 .

[15]  R. Andreoli,et al.  ENSO‐related rainfall anomalies in South America and associated circulation features during warm and cold Pacific decadal oscillation regimes , 2005 .

[16]  R. Fisher.  Statistical Methods for Research Workers , 1971 .

[17]  Charles G. Markham,et al.  Sea surface temperature related to rain in Ceará, north-eastern Brazil , 1977, Nature.

[18]  Naomi Naik,et al.  Wind-Driven Shifts in the Latitude of the Kuroshio–Oyashio Extension and Generation of SST Anomalies on Decadal Timescales* , 2001 .

[19]  C. Torrence,et al.  A Practical Guide to Wavelet Analysis. , 1998 .

[20]  Henry F. Diaz,et al.  Global climatic anomalies associated with extremes in the Southern Oscillation , 1989 .

[21]  J. Shukla,et al.  On the Dynamics of Droughts in Northeast Brazil: Observations, Theory and Numerical Experiments with a General Circulation Model , 1981 .

[22]  C. Ropelewski,et al.  Global and Regional Scale Precipitation Patterns Associated with the El Niño/Southern Oscillation , 1987 .

[23]  Paulo Nobre,et al.  Variations of Sea Surface Temperature, Wind Stress, and Rainfall over the Tropical Atlantic and South America. , 1996 .

[24]  B. Weare,et al.  Empirical orthogonal analysis of atlantic ocean surface temperatures , 1977 .

[25]  K. Mo,et al.  The Pacific–South American modes and their downstream effects , 2001 .

[26]  E. Rasmusson,et al.  Variations in Tropical Sea Surface Temperature and Surface Wind Fields Associated with the Southern Oscillation/El Niño , 1982 .

[27]  C. Nobre,et al.  On the influences of the El Niño, La niña and Atlantic Dipole Paterni on the Amazonian Rainfall during 1960-1998 , 2000 .

[28]  B. Rajagopalan,et al.  Observed decadal midlatitude and tropical Atlantic climate variability , 1998 .

[29]  V. Mehta.  Variability of the Tropical Ocean Surface Temperatures at Decadal–Multidecadal Timescales. Part I: The Atlantic Ocean , 1998 .

[30]  L. Mysak,et al.  Evidence for interannual and interdecadal climate variability in the South Atlantic , 1996 .

[31]  Thomas M. Smith,et al.  Improved Extended Reconstruction of SST (1854–1997) , 2004 .

[32]  James W. Hurrell,et al.  Decadal atmosphere-ocean variations in the Pacific , 1994 .

[33]  S. Hastenrath.  On Modes of Tropical Circulation and Climate Anomalies , 1978 .

[34]  P. Aceituno,et al.  On the Functioning of the Southern Oscillation in the South American Sector. Part I: Surface Climate , 1988 .

[35]  Ngar-Cheung Lau,et al.  Remote Sea Surface Temperature Variations during ENSO: Evidence for a Tropical Atmospheric Bridge , 1999 .

[36]  C. Jones,et al.  The South Atlantic Convergence Zone: Intensity, Form, Persistence, and Relationships with Intraseasonal to Interannual Activity and Extreme Rainfall , 2004 .

[37]  V. B. Rao,et al.  Characteristics of rainfall over Brazil: Annual variations and connections with the Southern Oscillation , 1990 .

[38]  D. Enfield,et al.  Tropical Atlantic sea surface temperature variability and its relation to El Niño‐Southern Oscillation , 1997 .

[39]  C. Mechoso,et al.  Relationships between Precipitation Anomalies in Uruguay and Southern Brazil and Sea Surface Temperature in the Pacific and Atlantic Oceans , 1998 .

[40]  Nicholas E. Graham,et al.  The 1976-77 Climate Shift of the Pacific Ocean , 1994 .

[41]  C. Mechoso,et al.  El Niño-Southern Oscillation Impact on Rainfall in Uruguay , 1994 .

[42]  R. Seager,et al.  The ENSO Teleconnection to the Tropical Atlantic Ocean: Contributions of the Remote and Local SSTs to Rainfall Variability in the Tropical Americas* , 2001 .

[43]  V. Barros,et al.  The Relation between Sea Surface Temperature at the Subtropical South-Central Pacific and Precipitation in Southeastern South America , 2002 .

[44]  Alberto M. Mestas-Nuñez,et al.  How ubiquitous is the dipole relationship in tropical Atlantic sea surface temperatures , 1999 .

[45]  R. Saravanan,et al.  The preconditioning role of Tropical Atlantic Variability in the development of the ENSO teleconnection: implications for the prediction of Nordeste rainfall , 2004 .

[46]  J. Wallace,et al.  A Pacific Interdecadal Climate Oscillation with Impacts on Salmon Production , 1997 .

[47]  J. Servain,et al.  The relationship between the simulated climatic variability modes of the tropical Atlantic , 2000 .

[48]  G. Brier,et al.  Some applications of statistics to meteorology , 1958 .

[49]  A. Montecinos,et al.  Seasonal Diagnostic and Predictability of Rainfall in Subtropical South America Based on Tropical Pacific SST , 2000 .

[50]  H. Virji.  A Preliminary Study of Summertime Tropospheric Circulation Patterns over South America Estimated from Cloud Winds , 1981 .

[51]  Multi‐scale variability of the sea surface temperature in the Tropical Atlantic , 2004 .

[52]  M. Latif,et al.  Interannual to Decadal Variability in the Tropical Atlantic , 2000 .

[53]  V. Kousky,et al.  The Southern Oscillation : oceanic-atmospheric circulation changes and related rainfall anomalies , 1983 .

[54]  S. Hastenrath,et al.  Forcing of anomalous sea surface temperature evolution in the tropical Atlantic during Pacific warm events , 1995 .

[55]  S. Hastenrath.  Prediction of Northeast Brazil Rainfall Anomalies , 1990 .

[56]  R. Andreoli,et al.  Tropical Pacific and South Atlantic effects on rainfall variability over Northeast Brazil , 2006 .

[57]  V. Kousky,et al.  EXTREMES IN THE SOUTHERN OSCILLATION ANO THEIR RELATIONSHIP TO PRECIPITATION ANOMALIES WITH EMPHASIS ON THE SOUTH AMERICAN REGION , 1989 .

[58]  J. Lenters,et al.  On the Origin of the Bolivian High and Related Circulation Features of the South American Climate , 1997 .

[59]  R. Andreoli,et al.  Relationships between rainfall anomalies over northeastern Brazil and the El Niño–Southern Oscillation , 2006 .

[60]  Kevin E. Trenberth,et al.  Recent Observed Interdecadal Climate Changes in the Northern Hemisphere , 1990 .