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Hydrological trends period from beginning of the 1970 decade have been noticeably activated; to a lesser extent have those around of 4 years. Notice that 8 years are, exactly, the mean time among marked peaks (Fig. 6.2): 1966, 1977, 1983, 1992, and 1998. On the other hand, in the Uruguay River, only the components of around 4 years of period was enhanced, although less noticeable than in the Paraná River. It is interesting to note that these are periods compatible with those associated to El Niño phenomenon whose influence on the regime of precipitations of the region has already been repeatedly reported (see below). 0.25 0.5 1 2 4 8 16 0.25 1940 1950 1960 1970 1980 1990 2000 Fig. 6.5. Wavelet power spectrum of the Paraná River for the period 1931-2001. [Jaime and Menéndez 2002]. 0.5 1 2 4 8 16 1940 1950 1960 1970 1980 1990 2000 Fig. 6.6. Wavelet power spectrum of the Uruguay River for the period 1931-2001. [Jaime and Menéndez 2002]. 79 4 3 2 1 0 -1 -2 -3 4 3 2 1 0 -1 -2
Hydrological trends In order to complete the scenario of streamflows trend changes in the La Plata basin, in figure 6.7 it is presented the annual mean flow of other tributaries. In each case, the mean flow is indicated for the complete period with available information (red line) and the linear trend calculated starting from 1970 (green line), when there are available data. It is observed that the Bermejo, Paraguay, Iguazú, Paraná and Uruguay rivers show positive trends in their streamflow from 1970, while the Pilcomayo River presents a trend to higher annual flows between 1960 and 1990 and from there on, a negative trend. 80 Fig. 6.7. Evolution of the mean annual flow for some tributaries. [Under secretariat of Water Resources -Argentina, WWWeb]
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CLIMATE CHANGE IN THE LA PLATA BASI
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INDEX FOREWORD . . . . . . . . . .
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7.3. Methodology . . . . . . . . .
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13.3. Regional validation of GCM fo
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1.1. Dropping the hypothesis of sta
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Introduction as they pour water ove
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A better understanding of the obser
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References Introduction Barros, V.
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ABSTRACT The hydrologic cycle of th
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La Plata basin climatology Within t
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in this last description, although
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warm season (October-April), in the
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La Plata basin climatology b. Upper
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La Plata basin climatology 2.3.3. R
Page 29 and 30: La Plata basin climatology Fig. 2.8
Page 31 and 32: 2.3.7. West and South borders La Pl
Page 33 and 34: References La Plata basin climatolo
Page 35 and 36: La Plata basin climatology Robertso
Page 37 and 38: 3.1. Introduction Interannual low f
Page 39 and 40: Interannual low frequency variabili
Page 41 and 42: 1989). This signal varies along eac
Page 43 and 44: Interannual low frequency variabili
Page 45 and 46: The main physiographic and hydrolog
Page 47 and 48: SUB-BASIN COUNTRY Argentina Bolivia
Page 49 and 50: the most important stretches of the
Page 51 and 52: Physiography and Hydrology The Para
Page 53 and 54: Physiography and Hydrology The Pant
Page 55 and 56: Physiography and Hydrology forcings
Page 57 and 58: Physiography and Hydrology It is no
Page 59 and 60: Physiography and Hydrology tion of
Page 61 and 62: Physiography and Hydrology INTERNAV
Page 63 and 64: 5.1. Introduction Precipitation and
Page 65 and 66: From 1956 to 1991, in most of the A
Page 67 and 68: -15 -20 -25 -30 -35 -40 -15 -20 -25
Page 69 and 70: Regional precipitation trends 5.3.2
Page 71 and 72: Regional precipitation trends and L
Page 73 and 74: trast, other regions suffer floodin
Page 75 and 76: ABSTRACT The main hydrological tren
Page 77 and 78: Following are the observed changes:
Page 79: In the case of the Paraná River th
Page 83 and 84: Hydrological trends In table 6.1 it
Page 85 and 86: Hydrological trends On the other ha
Page 87 and 88: the central area of the high basin
Page 89 and 90: 7.1. Introduction Several authors,
Page 91 and 92: Real evaporation trends a) PET > Pi
Page 93 and 94: a) b) c) Mean Temperature Real evap
Page 97 and 98: The positive trends of the mean tem
Page 99 and 100: d) e) f) Mean Temperature Real evap
Page 103 and 104: 7.5. Discussion and final comments
Page 105 and 106: ABSTRACT The water, as resource, is
Page 107 and 108: puts in risk large number of person
Page 109 and 110: The main services and problems of w
Page 111 and 112: There are similar problems in diffe
Page 113 and 114: 8.3.3. Energy a. Hydroelectric depe
Page 115 and 116: (chapters 12 and 13), because of th
Page 117 and 118: The main services and problems of w
Page 119 and 120: 9.1. Introduction The emissions of
Page 121 and 122: 9.4. Greenhouse effect The atmosphe
Page 123 and 124: Temperature anomalies (°C) 0.8 0.6
Page 125 and 126: Global climatic change at a global
Page 127 and 128: In view of the unavoidability of th
Page 129 and 130: Background on other regional aspect
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Background on other regional aspect
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Considering the non-linear interact
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SST anomalies also have influence o
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ABSTRACT The purpose of this chapte
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Global climate models Mid-1970’s
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Global climate models Table 11.1. B
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Global climate models Table 11.2. M
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Although changes in weather and cli
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Socio-economic variables and also s
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Applicability in impact assessments
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of the global climate system to the
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Climate scenarios B2: Assumes a wor
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Climate scenarios The reliability o
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Climate scenarios From Table 12.2 i
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Climate scenarios Fig. 12.5. The mu
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Climate scenarios this would be rel
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Results of global circulation model
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13.2.3. Statistical downscaling The
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La Plata basin are also considerabl
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10 N EQ 10 S 20 S 30 S 40 S 50 S 10
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Regional climatic scenarios Fig. 13
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a. Pre-industrial experiment: Initi
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Regional climatic scenarios Kalnay,
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Low-frequency variability 14.1. Bac
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egime occurred during the periods o
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Fig. 14.2. As Fig. 14.1, except for
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14.4. SST composites Low-frequency
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Low-frequency variability during th
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Fig. 14.10. As Fig. 14.9, except fo
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Low-frequency variability In genera
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Low-frequency variability Mantua, N
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15.1. Introduction Statistical anal
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Statistical analysis of extreme eve
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CURRÍCULA OF THE AUTHORS Vicente B
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Curricula of the autors Rubén Mari
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Proyect: SGP II 057: “Trends in t
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