The Hydrological Signal of the Moreno Glacier damming of Lake Argentino (Southern Andean Patagonia): The ENSO connection.

DEPETRIS, PJ Y PASQUINI AI

GLOBAL AND PLANETARY CHANGE

Elsevier

Año: 2000 p. 367 - 374

0921-8181

The periodic damming of Lake Argentino by the Perito Moreno Glacier 50830XS, 738 00XW. in Argentina’s southern Patagonian Andes has been recorded seventeen times since the beginning of this century. Such events are significant factors controlling discharge anomaliesseasonal component removed.of the Santa Cruz River, the sole outlet of Lake Argentino. Power spectrum analysis of the deseasonalized discharge revealed significant period peaks in the 33- to 36-month range and in the 42- to 58-month range. The first frequency is probably determined by the anomalous position of the subtropical anticyclones in the Pacificwith 2–5 years recurrence intervals., whereas the remaining frequencies are coincidental with the multivariate ENSO indexMEI.frequency spectrum. Significant squared coherency)0.78.between the Santa Cruz River discharge anomalies and the MEI suggests that there is a significant teleconnection between ENSO occurrences in the Pacific and the Perito Moreno Glacier dynamics. El Nin˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.50830XS, 738 00XW. in Argentina’s southern Patagonian Andes has been recorded seventeen times since the beginning of this century. Such events are significant factors controlling discharge anomaliesseasonal component removed.of the Santa Cruz River, the sole outlet of Lake Argentino. Power spectrum analysis of the deseasonalized discharge revealed significant period peaks in the 33- to 36-month range and in the 42- to 58-month range. The first frequency is probably determined by the anomalous position of the subtropical anticyclones in the Pacificwith 2–5 years recurrence intervals., whereas the remaining frequencies are coincidental with the multivariate ENSO indexMEI.frequency spectrum. Significant squared coherency)0.78.between the Santa Cruz River discharge anomalies and the MEI suggests that there is a significant teleconnection between ENSO occurrences in the Pacific and the Perito Moreno Glacier dynamics. El Nin˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.seasonal component removed.of the Santa Cruz River, the sole outlet of Lake Argentino. Power spectrum analysis of the deseasonalized discharge revealed significant period peaks in the 33- to 36-month range and in the 42- to 58-month range. The first frequency is probably determined by the anomalous position of the subtropical anticyclones in the Pacificwith 2–5 years recurrence intervals., whereas the remaining frequencies are coincidental with the multivariate ENSO indexMEI.frequency spectrum. Significant squared coherency)0.78.between the Santa Cruz River discharge anomalies and the MEI suggests that there is a significant teleconnection between ENSO occurrences in the Pacific and the Perito Moreno Glacier dynamics. El Nin˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.with 2–5 years recurrence intervals., whereas the remaining frequencies are coincidental with the multivariate ENSO indexMEI.frequency spectrum. Significant squared coherency)0.78.between the Santa Cruz River discharge anomalies and the MEI suggests that there is a significant teleconnection between ENSO occurrences in the Pacific and the Perito Moreno Glacier dynamics. El Nin˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.MEI.frequency spectrum. Significant squared coherency)0.78.between the Santa Cruz River discharge anomalies and the MEI suggests that there is a significant teleconnection between ENSO occurrences in the Pacific and the Perito Moreno Glacier dynamics. El Nin˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.˜o events, for example, appear to have fostered the advancement of the glacier’s snout and influenced the recorded damming–rupture sequence. q2000 Elsevier Science B.V. All rights reserved.q2000 Elsevier Science B.V. All rights reserved.