Variabilidad de la precipitación en la ciudad de Punta Arenas, Chile, desde principios del siglo XX

González‐Reyes, Álvaro; Aravena, Juan Carlos; Muñoz, Ariel A.; Soto-Rogel, Pamela; Aguilera-Betti, Isabella; Toledo-Guerrero, Isadora

doi:10.4067/s0718-686x2017000100031

Cited by 12 publications

(15 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4). Then, NZ and VD2 indicate increased positive correlations with importance of this variable on tree growth maybe as a response to increasing aridity, or a higher frequency of droughts alike that was reported for the area of Punta Arenas (see González-Reyes et al 2017). The positive influence of precipitation on tree growth at DF2, ST and VD2 may be due to the combination of several factors affecting the microsite hydrology: soil depth, steepness of the slopes (> 30%), and wind speeds that usually increase in the warm season (Carrasco 2002;Garreaud et al 2013;Schneider et al 2003).…”

Section: Precipitation and Temperature Influences On Tree Growthmentioning

confidence: 55%

Assessing the dendroclimatic potential of Nothofagus betuloides (Magellan’s beech) forests in the southernmost Chilean Patagonia

Fuentes

Aravena

Seim

et al. 2018

Trees

Self Cite

View full text Add to dashboard Cite

Key message Tree growth of Nothofagus betuloides forests south of 50°S is affected by local temperature and precipitation together with large-scale high-latitude climate patterns, but also significant influences from the Tropical Pacific were found. The characterization of past climate dynamics in southern South America is difficult due to the shortness of instrumental data. However, abundant forests in the southernmost part of the continent makes it an ideal place to assess the dendroclimatological potential for developing high-resolution climate proxy time series to extend the observations back in time. Whereas the majority of dendroclimatological studies have focused on latitudes north of 50°S, we present six new Magellan's beech (Nothofagus betuloides (Mirb.) Oerst.) tree-ring width (TRW) chronologies, spanning between 202 and 500 years, developed from southernmost Patagonia (> 50°S), Chile. The climate signal in the trees was analyzed using local station data, regional sea surface temperature (SST) and large-scale atmospheric indices: the Southern Oscillation Index (SOI) and the southern annual mode (SAM). The correlations between individual site chronologies and observed summer temperatures and precipitation varied, reflecting diverse microsite conditions and local scale geographic patterns. An influence of southern Pacific SST was evident at two of the northern sites. Although the associations with SOI and SAM were weak, the influence of regional sea level pressure on tree growth in the region was evident.

show abstract

Section: Precipitation and Temperature Influences On Tree Growthmentioning

confidence: 55%

Assessing the dendroclimatic potential of Nothofagus betuloides (Magellan’s beech) forests in the southernmost Chilean Patagonia

Fuentes

Aravena

Seim

et al. 2018

Trees

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Magellan Region includes the southernmost part of the Chilean Patagonia and Tierra del Fuego (48.50 • to 56.50 • latitude S, 66.5 • to 75.5 • longitude W; Figure 1). The Andes Cordillera is longitudinal aligned acting as a orographic barrier between the high-precipitation western area with 5000 mm per year (mma −1 ), and the eastern part with approximately 200 mma −1 [5,27,28]. Analyses on air temperature data reveal a distinct spatial pattern with variations associated with seasonality and local conditions such as the vicinity of glaciers or lakes, distance to the dominant mountain chain, among others [29].…”

Section: Study Areamentioning

confidence: 99%

“…Climatologically, the MR is prone to a marked west-to-east rainfall gradient, with more than 5000 mm per year at the western Pacific coast decreasing to less than 200 mm towards the eastern Atlantic coast (Figure 1). The forest-to-steppe transition zone reveals a strong decadal to multidecadal variability of the annual and seasonal precipitation, indicating a decrease in annual and summer precipitation whereas winter precipitation tends to increase [5]. Air temperature shows a warming trend of about 0.15 • C per decade over the period 1960-2010 [6].…”

Section: Introductionmentioning

confidence: 99%

Impact of Extreme Weather Events on Aboveground Net Primary Productivity and Sheep Production in the Magellan Region, Southernmost Chilean Patagonia

et al. 2020

Self Cite

View full text Add to dashboard Cite

Spatio-temporal patterns of climatic variability have effects on the environmental conditions of a given land territory and consequently determine the evolution of its productive activities. One of the most direct ways to evaluate this relationship is to measure the condition of the vegetation cover and land-use information. In southernmost South America there is a limited number of long-term studies on these matters, an incomplete network of weather stations and almost no database on ecosystems productivity. In the present work, we characterized the climate variability of the Magellan Region, southernmost Chilean Patagonia, for the last 34 years, studying key variables associated with one of its main economic sectors, sheep production, and evaluating the effect of extreme weather events on ecosystem productivity and sheep production. Our results show a marked multi-decadal character of the climatic variables, with a trend to more arid conditions for the last 8 years, together with an increase in the frequency of extreme weather events. Significant percentages of aboveground net primary productivity (ANPP) variance is explained by high precipitation, mesic temperatures, and low evapotranspiration. These conditions are, however, spatially distributed in the transition zone between deciduous forests and steppe and do not represent a general pattern for the entire region. Strong precipitation and wind velocity negatively affect lamb survival, while temperature and ANPP are positively correlated. The impact of extreme weather events on ANP and sheep production (SP) was in most of the cases significantly negative, with the exception of maximum temperature that correlated with an increase of ANPP, and droughts that showed a non-significant negative trend in ANPP. The examination of these relationships is urgent under the current scenario of climate change with the acceleration of the environmental trends here detected.

show abstract

“…This in combination with the unique topographic distribution of the Patagonian Andes creates one of the most pronounced precipitation gradients on earth (Carrasco et al, 2002;Schneider et al, 2003;Smith and Evans, 2007;Garreaud et al, 2013;Weidemann et al, 2018). Due to the north-south orientation of the Andes almost perpendicular to the westerly airflow, the regional west-to-east variation along the 53 • S latitude and across the southern Andes shows an annual precipitation of about 6,000 mm on the western slopes of the mountain range decreasing to <1,000 mm on the eastern slope (Schneider et al, 2003) and to 416 mm at Punta Arenas (González-Reyes et al, 2017). Figure 1 shows the geographical location and the three different specific study areas where the snow-cover variability has been reconstructed.…”

Section: Study Areamentioning

confidence: 99%

“…Earlier, Carrasco et al (2008), analyzing the 1958-2006 period, showed an overall increase of the precipitation registered at the Punta Arenas airport from around 1967 to 1991, but no trend thereafter. Later, González-Reyes et al (2017) with data updated to 2014, indicated that large interannual and inter-decadal precipitation variability has been observed for the last 100 years at Punta Arenas. Although a long-term trend is not evident from this record, a significant precipitation reduction has been observed after 1990, especially in spring and summer, while the winter precipitation has shown a significant increase.…”

Section: Introduction and Regional Settingmentioning

confidence: 99%

Snow Cover Change as a Climate Indicator in Brunswick Peninsula, Patagonia

et al. 2018

View full text Add to dashboard Cite

Snow cover changes are assessed for the Brunswick Peninsula in southern Patagonia (52.9 • S to 53.5 • S), located on the transition between the wet Pacific Ocean area and the drier leeward side of the Andes. We use the Normalized Difference Snow Index (NDSI) and a new index which we call Snow power , combining the NDSI and the Melt Area Detection Index (MADI), to reconstruct the snow cover extent and its temporal distribution for the period 2000-2016, based on Moderate Resolution Imaging Spectroradiometer Sensor (MODIS) MOD09GA products. Comparison of these satellite-derived products with available snow duration and snow height data for 2010-2016 at the local Club Andino ski center of Punta Arenas shows that the NDSI exhibits the best agreement. A reasonable and significant linear correlation is found between the MODIS NDSI snow cover extent and the mean monthly temperature at Punta Arenas Airport combined with the monthly snow accumulation at Jorge Schythe station at Punta Arenas city for the extended winter period (April to September) from 2000 to 2016. Snow cover changes within this time series are extended to 1972 and 1958 based on historical climate data of Jorge Schythe and Punta Arenas airport, repectively. The results show a significant decreasing trend of snow extent of 19% for Brunswick Peninsula for the 45-year period (1972-2016), which can be attributed to a statistically significant long-term warming of 0.71 • C at Punta Arenas during the extended winter (April-September) in the same period. Multiple correlation with different climate variables indicates that solid precipitation has a relevant role on short-term snow cover variability, but is not related to the observed long-term snow cover decrease.

show abstract

Variabilidad de la precipitación en la ciudad de Punta Arenas, Chile, desde principios del siglo XX

Cited by 12 publications

References 24 publications

Assessing the dendroclimatic potential of Nothofagus betuloides (Magellan’s beech) forests in the southernmost Chilean Patagonia

Assessing the dendroclimatic potential of Nothofagus betuloides (Magellan’s beech) forests in the southernmost Chilean Patagonia

Impact of Extreme Weather Events on Aboveground Net Primary Productivity and Sheep Production in the Magellan Region, Southernmost Chilean Patagonia

Snow Cover Change as a Climate Indicator in Brunswick Peninsula, Patagonia

Contact Info

Product

Resources

About