scholarly journals Tree-ring investigations into changing climatic responses of yellow-cedar, Glacier Bay, Alaska

2012 ◽  
Vol 42 (4) ◽  
pp. 814-819 ◽  
Author(s):  
Gregory C. Wiles ◽  
Colin R. Mennett ◽  
Stephanie K. Jarvis ◽  
Rosanne D. D’Arrigo ◽  
Nicholas Wiesenberg ◽  
...  
Keyword(s):  
Little Ice Age ◽  
Root Zone ◽  
Ring Width ◽  
High Elevation ◽  
Ice Age ◽  
Strong Negative Correlation ◽  
Glacier Bay ◽  
Temperature And Precipitation ◽  
Climatic Responses ◽  
Response To Temperature

Yellow-cedar ( Callitropsis nootkatensis (D. Don) Örsted ex D.P. Little) is in a century-long decline coinciding with the end of the Little Ice Age (LIA). The leading hypothesis explaining this decline is a decrease in insulating snowpack due to warming and increased susceptibility to damaging frosts in the root zone. A ring-width series from yellow-cedar on Excursion Ridge (260 m a.s.l.) in Glacier Bay National Park and Preserve, Alaska, and another from trees on Pleasant Island (150 m a.s.l.) in the Tongass National Forest in Icy Strait were compared with regional monthly temperature and precipitation data from Sitka, Alaska, to investigate the changing growth response to temperature at these sites. Comparisons with monthly temperatures from 1832 to 1876 during the end of the Little Ice Age show that the high-elevation Excursion Ridge and the low-elevation Pleasant Island sites strongly favored warmer January through July temperatures. Both tree populations have markedly changed their response from a positive to a strong negative correlation with January through July temperatures since 1950. This strong negative response to warming by the yellow-cedar together with a positive relationship with total March and April precipitation suggests that these yellow-cedar sites may be susceptible to decline. Furthermore, these analyses are consistent with the hypothesis that the yellow-cedar decline is linked to decreased snowpack.

scholarly journals Accelerating retreat and high-elevation thinning of glaciers in central Spitsbergen

2016 ◽  
Vol 10 (3) ◽  
pp. 1317-1329 ◽  
Author(s):  
Jakub Małecki
Keyword(s):  
Little Ice Age ◽  
High Elevation ◽  
Comprehensive Analysis ◽  
Ice Age ◽  
The Arctic ◽  
Digital Elevation ◽  
Glacier Changes ◽  
The Mean ◽  
Geodetic Mass Balance ◽  
The 1960S

Abstract. Svalbard is a heavily glacier-covered archipelago in the Arctic. Dickson Land (DL), in the central part of the largest island, Spitsbergen, is relatively arid and, as a result, glaciers there are relatively small and restricted mostly to valleys and cirques. This study presents a comprehensive analysis of glacier changes in DL based on inventories compiled from topographic maps and digital elevation models for the Little Ice Age (LIA) maximum, the 1960s, 1990, and 2009/2011. Total glacier area has decreased by  ∼ 38 % since the LIA maximum, and front retreat increased over the study period. Recently, most of the local glaciers have been consistently thinning in all elevation bands, in contrast to larger Svalbard ice masses which remain closer to balance. The mean 1990–2009/2011 geodetic mass balance of glaciers in DL is among the most negative from the Svalbard regional means known from the literature.

Climatic variation and runoff in mountain basins with differing proportions of glacier cover*

2006 ◽  
Vol 37 (4-5) ◽  
pp. 315-326 ◽  
Author(s):  
David N. Collins
Keyword(s):  
Air Temperature ◽  
Little Ice Age ◽  
Climatic Variation ◽  
Ice Age ◽  
Precipitation Data ◽  
Climatic Fluctuation ◽  
Temperature And Precipitation ◽  
Glacier Recession ◽  
Mountain Basins ◽  
High Elevations

Records of discharge from partially-glacierised basins in the upper Rhône catchment, Switzerland, were examined together with air temperature and precipitation data in order to assess impacts of climatic fluctuation and percentage glacierisation of basin on runoff, as glaciers declined from dimensions attained during the Little Ice Age. Above 60% glacierisation, year-to-year variations in runoff mimicked mean May–September air temperature, rising in the warm 1940s, declining in the cool 1970s, before increasing (by 50%) into the warm dry 1990s/2000s but not reaching 1940s maxima. In basins with between 35–60% glacierisation, flow also increased into the 1980s but waned through the 1990s. With less than 2% glacierisation, the pattern of runoff was broadly the inverse of that of temperature and followed precipitation, dipping in the 1940s, rising in the cool wet late 1960s, and declining into the 1990s/2000s, with glacier melt in warm years being insufficient to offset lack of precipitation. On mid-sized glaciers at relatively low elevations and with limited vertical extent, in warmer years, the transient snow line was above the highest point of the glacier. Only on large glaciers descending from high elevations can rising transient snowlines continue to expose more ice to melt. Runoff from such large glaciers was enhanced in warm summers but reduction of overall ice area through glacier recession led to runoff in the warmest summer (2003) being lower than the previous peak discharge recorded in the second warmest year (1947).

scholarly journals Modelling the evolution of Vadret da Morteratsch, Switzerland, since the Little Ice Age and into the future

2014 ◽  
Vol 60 (224) ◽  
pp. 1155-1168 ◽  
Author(s):  
Harry Zekollari ◽  
Johannes Jakob Fürst ◽  
Philippe Huybrechts
Keyword(s):  
Mass Balance ◽  
Little Ice Age ◽  
Flow Model ◽  
High Elevation ◽  
Ice Age ◽  
Balance Model ◽  
Monthly Precipitation ◽  
Initial State ◽  
Ice Dynamics ◽  
The Future

AbstractWe use a 3-D higher-order glacier flow model for Vadret da Morteratsch, Engadin, Switzerland, to simulate its strong retreat since the end of the Little Ice Age (LIA) and to project its future disintegration under a warming climate. The flow model, coupled to a 2-D energy-balance model, is initialized with the known maximum glacier extent during the LIA and subsequently forced with mean monthly precipitation and temperature records. To correctly reproduce the observed retreat of the glacier front for the period 1864–2010, additional mass-balance perturbations are required to account for uncertainties in the initial state, the mass-balance model and climate variations not captured by the ambient meteorological records. Changes in glacier volume and area are in good agreement with additional information from historical topographic maps. Under constant 2001–10 climate conditions, a strong retreat and mass loss continue and Vadret da Morteratsch disconnects from its main tributary, Vadret Pers, before 2020. The future glacier evolution is analysed in detail to understand the timing and rate of retreat, and to assess the role of ice dynamics. Assuming a linearly increasing warming of >3°C by 2100, only isolated and largely stagnant ice patches remain at high elevation.

scholarly journals Social vulnerability to climate in the "Little Ice Age"?: an example from Central Europe in the early 1770s

2006 ◽  
Vol 2 (2) ◽  
pp. 123-155 ◽  
Author(s):  
C. Pfister ◽  
R. Brázdil
Keyword(s):  
Social Vulnerability ◽  
Little Ice Age ◽  
Climate Impact ◽  
Climate Impacts ◽  
Economic Consequences ◽  
Ice Age ◽  
Weather Patterns ◽  
Temperature And Precipitation ◽  
Adverse Weather ◽  
Czech Lands

Abstract. The paper is oriented on social vulnerability to climate in Switzerland and in the Czech Lands during the early 1770s. Documentary sources of climate related to man-made archives are discussed. Methods of temperature and precipitation reconstruction based on this evidence as well as climate impact analyses are presented. Modelling of Little Ice Age-type Impacts (LIATIMP) is applied to highlight climate impacts during the period 1750–1800 in the Swiss Plateau and in the Czech Lands. LIATIMP are defined as adverse climate situations affecting grain production, mainly in terms of rainy autumns, cold springs and rainy harvest-periods. The most adverse weather patterns according to this model occurred from 1769 to 1771 causing two, in the case of the Czech Lands even three successive harvest failures. The paper addresses the social and economic consequences of this accumulation of climatic stress and explores how the authorities and the victims dealt with this situation.

scholarly journals Intemperate weather in violent times – narratives from the Western Balkans during the Little Ice Age (17-18th centuries)

2018 ◽  
Vol 44 (1) ◽  
pp. 137 ◽  
Author(s):  
J. Mrgic
Keyword(s):  
Little Ice Age ◽  
Late Phase ◽  
Danube River ◽  
Ice Age ◽  
Extreme Weather Events ◽  
Seasonal Temperature ◽  
Western Balkans ◽  
Land Use Patterns ◽  
Weather Patterns ◽  
Temperature And Precipitation

The paper aims to present narrative sources from the late phase of ‘Little Ice Age’ period for a part of the Southeastern Europe, which is still poorly investigated. In the lack of solid evidence, obtained by geo-sciences (dendrochronology, sediment and pollen analysis, records of instrumental measurements, etc.), the text relies on documentary ‘proxies’ derived from several chronicles and short notes. These accounts – from Dalmatian cities of Split and Makarska, Ottoman metropolis of Sarajevo, Franciscan monasteries in Kreševo (Bosnia) and in Šarengrad (Srem, after Habsburg re-conquest) – are unevenly distributed in time and geographical space, far from the quality of ‘weather diaries’, which existed elsewhere in Europe of this period. Nonetheless, the preserved sources verify in their own manner cumulative changes occurring throughout the region: people observed changes not only in high frequency of change of seasonal temperature and precipitation patterns and the scale, but more significantly, there was coupling of extreme weather events and heavy disturbances of weather patterns. Franciscan writers in Makarska and Kreševo repeatedly wrote how weather features and course of seasons were untimely, unexpected, sudden and detrimental, ‘suis temporibus non correspondens’, and how particular agricultural works could not be performed ‘ut moris est’, at the usual, traditional schedule, due to the weather perturbances. Adriatic summers turned extremely hot and dry, with long periods without any rain, while data from Šarengrad corroborate results obtain in the historical climatology for Hungary on the severity of winters and long period of frozen Danube River. Mulla Basheski’s records from Sarajevo yield information on Miljacka River flood events, in connection to both climate condition and land-use patterns. This paper is foremost an attempt to draw attention to research possibilities for the Western Balkans, and there are more documentary, narrative and archival sources to be further investigated, with collaborations among geoscientists and historians.

Time, Oral Tradition, and Archaeology at Xakwnoowú, A Little Ice Age Fort in Southeastern Alaska

2013 ◽  
Vol 78 (1) ◽  
pp. 3-23 ◽  
Author(s):  
Aron L. Crowell ◽  
Wayne K. Howell
Keyword(s):  
Little Ice Age ◽  
Oral Tradition ◽  
Cultural Landscapes ◽  
Historical Consciousness ◽  
Scientific Data ◽  
Ice Age ◽  
Current Debate ◽  
Geological Evidence ◽  
Specific Detail ◽  
Glacier Bay

AbstractAs a linguistic medium, oral tradition conveys rich and specific detail about past events but is also subject to alteration in the course of transmission between generations. As a source for indigenous history, spoken heritage is characteristically specific in geographic attribution and thus definitive of cultural landscapes, but it is temporally under-defined because it is unconstrained by calendrical dates. We consider these qualities in relation to Tlingit oral accounts that refer to Xak-wnoowú, an 850-year-old fort in the Glacier Bay region of southeastern Alaska. The site is narratively linked to the origins of Tlingit warfare and of the Kaagwaantaan clan, and remains a landmark of historical consciousness for contemporary descendants. We apply archaeological and geological evidence to date and verify key oral narratives, finding substantial convergence with scientific data and a complementarity of perspective that potentiates fuller understandings of both Tlingit history and environmental change during the Little Ice Age. We conclude that the historicity of oral tradition—a topic of wide current debate—is clearly demonstrated at Xakwnoowú, although instances of chronological compression are revealed by the analysis.

Tree-ring derived Little Ice Age temperature trends from the central British Columbia Coast Mountains, Canada

2012 ◽  
Vol 78 (3) ◽  
pp. 417-426 ◽  
Author(s):  
Kara J. Pitman ◽  
Dan J. Smith
Keyword(s):  
British Columbia ◽  
Coarse Woody Debris ◽  
Little Ice Age ◽  
Woody Debris ◽  
High Elevation ◽  
Ice Age ◽  
Climatic Fluctuations ◽  
Coast Mountains ◽  
Air Temperature Anomaly ◽  
June July

AbstractMost glaciers in the British Columbia Coast Mountains reached their maximum Holocene extent during the Little Ice Age. Early- and late-Little Ice Age intervals of expansion and retreat fluctuations describe a mass-balance response to changing climates. Although existing dendroclimatic records provide insights into these climatic fluctuations over the last 400 yr, their short durations prohibit evaluation of early-Little Ice Age climate variability. To extend the duration of these records, submerged coarse woody debris salvaged from a high-elevation lake was cross-dated to living chronologies. The resulting chronology provides the opportunity to reconstruct a regional June–July air-temperature anomaly record extending from AD 1225 to 2010. The reconstruction shows that the intervals AD 1350–1420, 1475–1550, 1625–1700 and 1830–1940 characterized distinct periods of below-average June–July temperature followed by periods of above-average temperature. Our reconstruction provides the first annually resolved insights into high-elevation climates spanning the Little Ice Age in this region and indicates that Little Ice Age moraine stabilization corresponds to persistent intervals of warmer-than-average temperatures. We conclude that coarse woody debris submerged in high-elevation lakes has considerable potential for developing lengthy proxy climate records, and we recommend that researchers focus attention on this largely ignored paleoclimatic archive.

scholarly journals Social vulnerability to climate in the "Little Ice Age": an example from Central Europe in the early 1770s

2006 ◽  
Vol 2 (2) ◽  
pp. 115-129 ◽  
Author(s):  
C. Pfister ◽  
R. Brázdil
Keyword(s):  
Social Vulnerability ◽  
Little Ice Age ◽  
Climate Impact ◽  
Climate Impacts ◽  
Economic Consequences ◽  
Ice Age ◽  
Weather Patterns ◽  
Temperature And Precipitation ◽  
Adverse Weather ◽  
Czech Lands

Abstract. The paper is oriented on social vulnerability to climate in Switzerland and in the Czech Lands during the early 1770s. Documentary sources of climate related to man-made archives are discussed. Methods of temperature and precipitation reconstruction based on this evidence as well as climate impact analyses are presented. Modelling of Little Ice Age-type Impacts (LIATIMP) is applied to highlight climate impacts during the period 1750–1800 in the Swiss Plateau and in the Czech Lands. LIATIMP are defined as adverse climate situations affecting agricultural production, mainly in terms of rainy autumns, cold springs and rainy harvest-periods. The most adverse weather patterns according to this model occurred from 1769 to 1771 causing two, in the case of the Czech Lands even three successive harvest failures. The paper addresses the social and economic consequences of this accumulation of climatic stress and explores how the authorities and the victims dealt with this situation.

scholarly journals Methodological proposal for the analysis of the evolution of glaciers since the Little Ice Age and its application in the Tröllaskagi Peninsula (northern Iceland)

2018 ◽  
Vol 44 (1) ◽  
pp. 69
Author(s):  
J.M. Fernández-Fernández ◽  
N. Andrés
Keyword(s):  
Little Ice Age ◽  
Climate Models ◽  
Statistical Treatment ◽  
Ice Age ◽  
Temperature And Precipitation ◽  
Highly Sensitive ◽  
Climatic Evolution ◽  
Reduction In Area ◽  
Climate Series ◽  
Area And Volume

In this paper we propose a methodological sequence for the study of glaciers and climate change, and for the use of glaciers as indicators of climatic evolution. Our proposal includes different techniques focused on: mapping glacier extents at different dates, measuring front variations, calculating areas and volumes, analyzing glacier Equilibrium-Line Altitudes (ELA), statistical treatment of climate series, and the application of glacier-climate models that relate temperature and precipitation and enable paleoclimate reconstruction. This methodology was tested by remote monitoring of three highly sensitive debris-free glaciers in the Tröllaskagi peninsula (northern Iceland) since the end of the Little Ice Age (LIA), and the results show an average retreat of 1.3 km as well as a reduction in area and volume of 25% and 33% as a result of the warming that began at the end of the LIA. The application of the glacier-climate models suggests a climate that was up to 49% less humid at the LIA maximum. The bibliographic review of the methods utilized enables us to validate our methodological proposal and the results obtained, and ensures its application in different areas of study.

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