| PALEOLIMNOLOGY |
Quantitative summer-temperature reconstructions for the last 2000 years based on pollen-stratigraphical data from northern
Fennoscandia.
|
|
Bjune, A.E.,Seppä, H.,Birks, H.J.B. 2008 Quantitative summer-temperature reconstructions for the last 2000 years based on
pollen-stratigraphical data from northern Fennoscandia. Journal of Paleolimnology
| Data Coverage |
North: 68.433 * South: 68.433 |
|
West: 18.066 * East: 18.066 |
|
Altitude: 510 m |
Start Year: -121 cal yr BP * End Year: 1995 cal yr BP
Data: Please Cite Data Contributors!
|
|
Summary: Quantitative reconstructions of mean July temperatures (T jul) based
on new and previously published pollen-stratigraphical data covering
the last 2000 years from 11 lakes in northern Fennoscandia and the
Kola Peninsula are presented. Tjul values are based on a previously
published pollen-climate transfer function for the region with a
root-mean-square error of prediction (RMSEP) of 0.99°C. The most
obvious trend in the inferred temperatures from all sites is the
general decrease in Tjul during the last 2000 years. Pollen-inferred
Tjul values on average 0.18 ± 0.56°C (n = 91) higher than present
(where "present" refers to the last three decades based on pollen-
inferred Tjul in core-top samples) are indicated between 0 and 1100 AD
(2000¿850 cal year BP), and temperatures ?0.2 ± 0.47°C (n = 78) below
present are inferred between 1100 and 1900 AD (850¿50 cal year BP).
No consistent temperature peak is observed during the 'Medieval Warm
Period', ca. 900¿1200 AD (1100¿750 cal year BP), but the cooler period
between 1100 and 1900 AD (850¿50 cal year BP) corresponds in general
with the 'Little Ice Age' (LIA). Consistently with independent stable
isotopic data, the composite pollen-based record suggests that the
coldest periods of the LIA date to 1500¿1600 AD (450¿350 cal year BP)
and 1800¿1850 AD (150¿100 cal year BP). An abrupt warming occurred
at about 1900 AD and the twentieth century is the warmest century
since about 1000 AD (950 cal year BP).
More Info on Paleolimnology |
|
|
Complete XML Record: noaa-lake-6193
(Last Revised: 2009-02-11 )
|
|
 |
DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
325 Broadway, E/CC23
Boulder, CO 80305
USA
|
| http://www.ncdc.noaa.gov/paleo/ |
| E-mail: bruce.a.bauer@noaa.gov |
| E-mail: paleo@noaa.gov |
Phone: 303-497-6280
Fax: 303-497-6513
|
|
