Reconstruction of a regional drought index in southern Sweden since AD 1750
(2011) In The Holocene 21(4). p.667-679- Abstract
- We used a network of eight pedunculate oak (Quercus robur L.) sites (n(trees) = 70) and one Scots pine (Pinus sylvestris L.) site (n(trees) = 53) to develop drought-sensitive master chronologies for the two areas in southern Scandinavia: a SW-area centred on 57AN 12.7AE and a NE-area centred on 58.8AN 18.2AE. The ratio of actual to equilibrium evapotranspiration (AET/EET) was used as a measure of drought during the growing season defined as the period with average daily temperatures above 9 degrees C. Instrumental data were used to parameterize the relationship between tree-ring data and the drought index (DI) over 1922-2000 for the SW area and over 1922-1995 for the NE area. The DI reconstructions explained 29.7% (SW area) and 43.7% (NE... (More)
- We used a network of eight pedunculate oak (Quercus robur L.) sites (n(trees) = 70) and one Scots pine (Pinus sylvestris L.) site (n(trees) = 53) to develop drought-sensitive master chronologies for the two areas in southern Scandinavia: a SW-area centred on 57AN 12.7AE and a NE-area centred on 58.8AN 18.2AE. The ratio of actual to equilibrium evapotranspiration (AET/EET) was used as a measure of drought during the growing season defined as the period with average daily temperatures above 9 degrees C. Instrumental data were used to parameterize the relationship between tree-ring data and the drought index (DI) over 1922-2000 for the SW area and over 1922-1995 for the NE area. The DI reconstructions explained 29.7% (SW area) and 43.7% (NE area) of the variance in the observed DI index in the calibration period, and were extended back to AD 1770 for the SW area and to AD 1750 for the NE area. Reconstructed drought dynamics suggested strong decadal- and century-scale temporal variability and limited regional synchronicity over 1770-2000. Large variations in DI were observed in both regions in the second half of the 1700s. Dry conditions were synchronously reconstructed in both sub-regions during 1781-1784, 1853-1855, and, to a lesser degree, during 1974-1978. Over the 1945-1975 period the SW area exhibited a trend towards drier growing seasons, whereas no such trend could be identified for the NE area. Analysis of correlation maps indicated that regional DI dynamics reflected two different climate regimes, associated with the Kattegat area (SW reconstruction) and southeastern Swedish coast of the Baltic sea (NE reconstruction). (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1985975
- author
- Drobyshev, Igor ; Niklasson, Mats ; Linderholm, Hans W. ; Seftigen, Kristina ; Hickler, Thomas LU and Eggertsson, Olafur
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- climate variation, dendroclimatic reconstruction, drought, oak, precipitation dynamics, Scandinavia, tree rings, water stress
- in
- The Holocene
- volume
- 21
- issue
- 4
- pages
- 667 - 679
- publisher
- SAGE Publications
- external identifiers
-
- wos:000290946800012
- scopus:79957638352
- ISSN
- 0959-6836
- DOI
- 10.1177/0959683610391312
- language
- English
- LU publication?
- yes
- id
- 77609297-a2cf-4964-af4c-4499d557eb4b (old id 1985975)
- date added to LUP
- 2016-04-01 10:43:49
- date last changed
- 2022-04-12 17:06:28
@article{77609297-a2cf-4964-af4c-4499d557eb4b, abstract = {{We used a network of eight pedunculate oak (Quercus robur L.) sites (n(trees) = 70) and one Scots pine (Pinus sylvestris L.) site (n(trees) = 53) to develop drought-sensitive master chronologies for the two areas in southern Scandinavia: a SW-area centred on 57AN 12.7AE and a NE-area centred on 58.8AN 18.2AE. The ratio of actual to equilibrium evapotranspiration (AET/EET) was used as a measure of drought during the growing season defined as the period with average daily temperatures above 9 degrees C. Instrumental data were used to parameterize the relationship between tree-ring data and the drought index (DI) over 1922-2000 for the SW area and over 1922-1995 for the NE area. The DI reconstructions explained 29.7% (SW area) and 43.7% (NE area) of the variance in the observed DI index in the calibration period, and were extended back to AD 1770 for the SW area and to AD 1750 for the NE area. Reconstructed drought dynamics suggested strong decadal- and century-scale temporal variability and limited regional synchronicity over 1770-2000. Large variations in DI were observed in both regions in the second half of the 1700s. Dry conditions were synchronously reconstructed in both sub-regions during 1781-1784, 1853-1855, and, to a lesser degree, during 1974-1978. Over the 1945-1975 period the SW area exhibited a trend towards drier growing seasons, whereas no such trend could be identified for the NE area. Analysis of correlation maps indicated that regional DI dynamics reflected two different climate regimes, associated with the Kattegat area (SW reconstruction) and southeastern Swedish coast of the Baltic sea (NE reconstruction).}}, author = {{Drobyshev, Igor and Niklasson, Mats and Linderholm, Hans W. and Seftigen, Kristina and Hickler, Thomas and Eggertsson, Olafur}}, issn = {{0959-6836}}, keywords = {{climate variation; dendroclimatic reconstruction; drought; oak; precipitation dynamics; Scandinavia; tree rings; water stress}}, language = {{eng}}, number = {{4}}, pages = {{667--679}}, publisher = {{SAGE Publications}}, series = {{The Holocene}}, title = {{Reconstruction of a regional drought index in southern Sweden since AD 1750}}, url = {{http://dx.doi.org/10.1177/0959683610391312}}, doi = {{10.1177/0959683610391312}}, volume = {{21}}, year = {{2011}}, }