Search for dissertations about: "tree rings"

Showing result 1 - 5 of 24 swedish dissertations containing the words tree rings.

2. 1. Late Holocene spatiotemporal hydroclimatic variability over Fennoscandia inferred from tree-rings

   Author : Kristina Seftigen; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tree-rings; Fennoscandia; hydroclimate; SPEI; SPI; ring-width; maximum latewood density; stable isotopes; field reconstruction; point-by-point regression;

   Abstract : There is a broad scientific consensus that the global climate is changing, and that human activity is a significant factor contributing to the change. The response of the hydrological cycle to the warming is far reaching, including increases in the intensification and frequency of extreme hydroclimatological events. READ MORE

4. 2. Tree-rings and climate - Standardization, proxy-development, and Fennoscandian summer temperature history

   Author : Jesper Björklund; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tree rings; Fennoscandia; summer temperature; maximum latewood density MXD ; blue intensity BI ; standardization;

   Abstract : Instrumental meteorological observation are too short for trying to estimate climate change and variability on multi-decadal and centennial time-scales, and when trying to evaluate the response of the climate system to human influence, such as raised concentrations of green house gases (GHG), altered land-use, black carbon etc. To access information about the climate system predating instrumental observations, reliable proxy records (natural archives) are necessary. READ MORE

5. 3. Trees and the environment : Possibilities and challenges in tree-ring research across spatial and temporal scales based on case studies in Sweden

   Author : Eva Rocha; Steffen Holzkämper; Björn Gunnarson; Anders Moberg; Martin De Luis; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tree rings; Sweden; climate variability; environmental monitoring; ring width; maximum latewood density; stem radial increment; ED-XRF; light rings; Physical Geography; naturgeografi;

   Abstract : The need to understand and quantify the magnitude and frequency of past and current environmental changes increased the demand for high-resolution proxy data across spatial and temporal scales. Due to their long lifespan and global distribution, trees provide a unique and continuous record of environmental variability. READ MORE

6. 4. Tree Rings as Sensitive Proxies of Past Climate Change

   Author : Håkan Grudd; Wibjörn Karlén; Brian Luckman; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Tree ring; width; density; climate; temperature; change; variability; sensitivity; Torneträsk; Tornetrask; Sweden; Fennoscandia; explosive; volcanic; eruption; Santorini; Thera; subfossil; Fitzroya; Chile; Physical geography; Naturgeografi;

   Abstract : In the boreal forests of the Northern Hemisphere, time series of tree-ring width (TRW) and maximum density in the latewood (MXD) are highly correlated to local instrumental summer-temperature data and are thus widely used as proxies in high-resolution climate reconstructions. Hence, much of our present knowledge about climatic variability in the last millennium is based on tree-rings. READ MORE

7. 5. Spatiotemporal climate and atmospheric circulation variability in Asia inferred from tree rings

   Author : Andrea Seim; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Asia; atmospheric circulation; Central Asia; dendroclimatology; growth-climate relationship; objectively classified weather types; teleconnections; tree-ring networks;

   Abstract : Observed 20th century warming trends accompanied by more frequent weather extremes such as droughts or intense rainfall events have consequences for societies and environments alike. In Asia, where the majority of the population depend on agricultural productivity, recent climate change is likely to increase societal hardships. READ MORE