82
R.D. D'Arrigo and G.C . Jacoby
western Argentina back to A.D . 1491. On Chiloe Island, which has been
proposed as a site for possible AMIGO transects, Roig and Boninsegna
(1989) developed a preliminary reconstruction of precipitation using
Pilgerodendron uviferum , an austral conifer. Villalba (1990) modeled
climate fluctuations over the past millenium in the Rio Alerce region of
northern Patagonia based on alerce (Fitzroya cupressoides) , the longestlived conifer in South America (Boninsegna, 1992). Lara and Villalba
(1993) reconstructed summer temperature s for the past 3620 years for
southern South America based on alerce tree-ring width data .
Boninsegna et al. (1990) describe a data base of 21 southern beech
(Nothof agus) ring width chronologies developed for Tierra del Fuego,
Argentina, by Argentinian and U.S . scientists. These chronologies are
derived from the southernmost forests on the globe. Most are a few
hundred years in length, although a few date back to the 1500s. The
chronologies separate into three regions: a northern region, which is
drought-sensitive, and two areas to the south (see Figure 5.3) which are
primarily sensitive to temperature. This data base is currentl y being used
in studies of subantarctic climate.
Discussion
In this section, we outline three topics of current interest that could be
addressed through comparisons of tree-ring records from the west coasts
of the two Americas.
S
3
1
'"
.....
0=
= -1
u
'"
-3
-s
17SB
18BB
18SB
19BB
YEARS
19SB
S
-1
-3
-S
2BBH
Figure 5.3. Dominant mode of variation (based on principal components analysis)
for a subset of four temperature-sensitive tree-ring width chronologies of southern
beech (No thof agus) from Tierra del Fuego , Argentina (based on data discussed in
Boninsegna et aI., 1989). These chronologies have been produced from some of
the southernmost trees in South America and the world. The chronologies from
Arrigetch (Figure 5.2), by comparison represent some of the north ernmost trees
in western North America.
R.D. D'Arrigo and G.C . Jacoby
western Argentina back to A.D . 1491. On Chiloe Island, which has been
proposed as a site for possible AMIGO transects, Roig and Boninsegna
(1989) developed a preliminary reconstruction of precipitation using
Pilgerodendron uviferum , an austral conifer. Villalba (1990) modeled
climate fluctuations over the past millenium in the Rio Alerce region of
northern Patagonia based on alerce (Fitzroya cupressoides) , the longestlived conifer in South America (Boninsegna, 1992). Lara and Villalba
(1993) reconstructed summer temperature s for the past 3620 years for
southern South America based on alerce tree-ring width data .
Boninsegna et al. (1990) describe a data base of 21 southern beech
(Nothof agus) ring width chronologies developed for Tierra del Fuego,
Argentina, by Argentinian and U.S . scientists. These chronologies are
derived from the southernmost forests on the globe. Most are a few
hundred years in length, although a few date back to the 1500s. The
chronologies separate into three regions: a northern region, which is
drought-sensitive, and two areas to the south (see Figure 5.3) which are
primarily sensitive to temperature. This data base is currentl y being used
in studies of subantarctic climate.
Discussion
In this section, we outline three topics of current interest that could be
addressed through comparisons of tree-ring records from the west coasts
of the two Americas.
S
3
1
'"
.....
0=
= -1
u
'"
-3
-s
17SB
18BB
18SB
19BB
YEARS
19SB
S
-1
-3
-S
2BBH
Figure 5.3. Dominant mode of variation (based on principal components analysis)
for a subset of four temperature-sensitive tree-ring width chronologies of southern
beech (No thof agus) from Tierra del Fuego , Argentina (based on data discussed in
Boninsegna et aI., 1989). These chronologies have been produced from some of
the southernmost trees in South America and the world. The chronologies from
Arrigetch (Figure 5.2), by comparison represent some of the north ernmost trees
in western North America.