Table 1 Precipitation records from meteorological stations selected for the reconstruction, and their correlations with the Polylepis tarapacana δ¹⁸O chronology for the common period

Meteorological	Country	Elevation	Latitude	Longitude	Distance to	Mean Precip	Common	Number	Pearson r	T value	Average Pearson r	Pearson r with
Station	(Source)	m a.s.l.	°S	°W	Study site	1982–1993	period	of	with δ¹⁸O	with δ¹⁸O	with other stations	regional mean
					km	mm	with δ¹⁸O	years	Comm. period	Comm. period	1982–1993	1982–1993
1- La Paz	Bolivia^(a)	4060	16.52	68.17	640	402	1949–2001	53	−0.55***	56	0.64	0.81***
2- Patacamaya	Bolivia^(a)	3789	17.25	67.95	563	255	1946–1993	48	−0.35**	40	0.57	0.78***
3- Puchuni	Bolivia^(c)	4208	17.3	67.43	548	310	1982–2002	21	−0.59***	47	0.64	0.92***
4- Alcerreca	Chile^(b)	3900	17.98	69.65	535	217	1972–2008	37	−0.31*	61	0.50	0.66**
5- Oruro	Bolivia^(a)	3702	18.05	67.07	458	295	1944–1998	55	−0.58***	66	0.69	0.92***
6- Cancosa	Chile^(b)	3930	19.85	68.60	301	149	1977–2011	35	−0.56***	112	0.73	0.93***
7- Linzor	Chile^(b)	4100	22.23	68.02	86	135	1975–2014	35	−0.63***	100	0.66	0.91***
8- Socaire	Chile^(b)	3251	23.58	67.88	159	30	1975–2014	39	−0.62***	136	0.67	0.89***

Stations are ordered and numbered from north to south according to Fig. 1b. The source of information is depicted between brackets next to the country of location of each station. Mean precipitation was calculated between 1982 and 1993, the period of overlap among all meteorological records. The common period between each station and the δ¹⁸O chronology is indicated, followed by the length of the stations, the Pearson correlation coefficient with δ¹⁸O, and T values, over this common period. The average Pearson correlation coefficient between each station and their neighbours, and the Pearson correlation coefficient between each station and the regional-mean precipitation series used for the reconstruction, are also indicated for 1982–1993.
Comm. Period common period.
*p < 0.1; **p < 0.05; ***p < 0.001.
^(a)SENAMHI: Servicio Nacional de Meteorología e Hidrología, Bolivia.
^(b)DGA: Dirección General de Aguas, Chile.
^(c)Ref. ¹⁰¹.

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