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ÿþ<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <HTML> <HEAD> <META http-equiv="Content-Type" content="text/html; charset=Shift_JIS"> <META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 7.0.0.0 for Windows"> <META http-equiv="Content-Style-Type" content="text/css"> <TITLE></TITLE> </HEAD> <BODY> <P class="MsoBodyText"><FONT size="2" face="Times New Roman"> Bulletin of Glaciological Research 21 (2004) <FONT size="2" face="Times New Roman"> <FONT size="2" face="Times New Roman"><EM>45-48</EM></FONT><BR> </FONT>&copy;Japanese Society of Snow and Ice</FONT></P> <P class="MsoNormal"><FONT size="5" face="Arial"> <STRONG>Recent thickening trend of Glaciar Perito Moreno,southern Patagonia.<BR> </STRONG></FONT></P> <P class="MsoNormal"><FONT face="Arial" size="4"> <B>Pedro SKVARCA<sup>1</sup>, Renji NARUSE<sup>2</sup> and Hernán DE ANGELIS<sup>2</sup></B></FONT><BR> <FONT face="Times New Roman"> 1. Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina <BR> 2. Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819 Japan<BR> <BR> </FONT></P> <P class="MsoNormal">&nbsp;</P> <BLOCKQUOTE> <P class="MsoNormal"><FONT face="Arial"><STRONG>Abstract</STRONG></FONT></P> </BLOCKQUOTE> <P class="MsoNormal">0<FONT face="Times New Roman"> Surface elevations were measured five times at the ablation area of Glaciar Perito Moreno, southern Patagonia, i.e. in austral summers 1990, 1993, 1996, 1999 and 2002. The mean ice-thickness along a transverse line slightly decreased from 1990 to 1996, but increased by about 5 m from 1996 to 2002. Whereas, the ice-thickness along a longitudinal line increased about 1.5 m from 1990 to 1993, remained almost unchanged between 1993 and 1999, and increased significantly (more than 6 m) from 1999 to 2002. The average thickening rates at eight points along both lines in the mid-reaches were +0.2 m a-1 in 1990-93, -0.1 m a<FONT size="1"><sup>-1</FONT></sup>-1 in 1993-96, +0.5 m a<FONT size="1"><sup>-1</FONT></sup> in 1996-99, and +1.4 m a<FONT size="1"><sup>-1</FONT></sup> in 1999-2002. Thus, while the glacier was almost in equilibrium in the early half of the 1990s, it has been thickening recently at accelerating rates. Based on field observations of surface structures and on information of terminus fluctuations, this current thickening trend is unlikely related to a surge. Though it may be due to dynamic causes of the glacier or positive mass-balance, the detailed mechanisms are not yet clear. As a probable result of detected glacier thickening, an ice-dam has formed in 2003 and the water level in Brazo Rico started to rise from November, indicating that a possible rupture may occur again in the near future. </FONT></P> </BODY> </HTML>
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