since A.D. 1409 inferred from tree rings.
since A.D. 1409 inferred from tree rings.
Quaternary Research
Volume 58, pp. 103-111, September 2002.
Scott St. George
Geological Survey of Canada
Erik Nielsen
Manitoba Geological Survey
|
Hydroclimatic change in southern Manitoba since A.D. 1409 inferred from tree rings. | |
|
|
Hydroclimatic change in southern Manitoba since A.D. 1409 inferred from tree rings. Quaternary Research Volume 58, pp. 103-111, September 2002. Scott St. George Geological Survey of Canada Erik Nielsen Manitoba Geological Survey |
| ABSTRACT: A record of estimated annual (prior August to current July) precipitation derived from a regional bur oak (Quercus macrocarpa Michx.) tree-ring chronology indicates that southern Manitoba's hydroclimate has been relatively stable over the last 200 yr. Although this stability was interrupted briefly by pronounced wet intervals in the late A.D. 1820s and 1850s, hydroclimatic conditions since permanent Euro-Canadian settlement were much less variable and persistent than those prior to A.D. 1790. The reconstruction indicates that the Red River basin experienced extremely dry conditions between A.D. 1670 and 1775, with below-normal precipitation occurring approximately 2 years out of 3. Annual precipitation was estimated at more than two standard deviations below the mean during A.D. 1477, 1485, 1556, 1595, 1612, 1644, 1661, 1743, 1900, and 1980. Comparisons with limnological records from North Dakota and Minnesota suggest that multidecadal fluctuations in regional hydroclimate have been remarkably coherent across the northeastern Great Plains during the last 600 yr. However, individual dry years in the Red River basin were usually associated with larger scale drought across much of the North American interior. |
| DATA: Download the reconstructed Manitoba annual precipitation and the Southeast Manitoba regional tree ring chronology from the WDC Paleo Archive. |
|
Download Red River basin Q. macrocarpa ringwidth data used in this study: | ||||||
| Site | Lat. (� N) | Long. (� W) | Type | No. of Trees | Span | Elevation (m) |
| Hyland Park | 49� 59' 05" | 97� 02' 55" | Living | 17 | 1823 � 1999 | 230 |
| Kildonan Park | 49� 56' 30" | 97� 06' 00" | Living | 38 | 1720 � 1999 | 230 |
| Winnipeg | 49� 50' | 97� 12" | Living | 16 | 1822 � 1994 | 230 |
| Winnipeg | Historical | 29 | 1644 � 1865 | |||
| Barber House | 49� 54' 20" | 97� 07' 15" | Historical | 39 | 1648 � 1864 | |
| Munsen Park | 49� 52' 30" | 97� 09' 40" | Living | 9 | 1860 � 1999 | 230 |
| Bruce Park | 49� 52' 30" | 97� 13' 30" | Living | 15 | 1855 � 1999 | 230 |
| St. Vital Park | 49� 45' 25" | 97� 08' 50" | Living | 17 | 1855 � 1998 | 230 |
| St. Norbert | 49� 45' 25" | 97� 08' 50" | Living | 10 | 1855 � 1998 | 230 |
| LaBarriere Park | 49� 43' 10" | 97� 10' 30" | Living | 11 | 1892 � 1998 | 230 |
| Delorme House | 49� 33' 40" | 97� 11' 05" | Historical | 3 | 1696 - 1853 | |
| Shay | 49� 38' 45" | 97� 06' 45" | Living | 14 | 1907 � 1999 | 230 |
| Rat River House | 49� 35' 15" | 97� 08' 15" | Historical | 6 | 1659 - 1859 | |
| Ste. Agathe | 49� 32' 45" | 97� 12' 10" | Living | 11 | 1856 � 1998 | 230 |
| Parker Farm | 49� 31' 50" | 97� 13' 00" | Living | 24 | 1877 � 1998 | 230 |
| Horseshoe Lake | 49� 20' 25" | 97� 19' 30" | Living | 15 | 1907 � 1999 | 230 |
| St. Jean Baptiste | 49� 16' 35" | 97� 19' 50" | Living | 10 | 1883 � 1997 | 235 |
| Remus Farm | 49� 04' 20" | 97� 12' 30" | Living | 10 | 1875 � 1998 | 235 |
| Marais River | 49� 03' 50" | 97� 18' 35" | Living | 13 | 1850 � 1998 | 235 |
| Fort Dufferin | 49� 01' 50" | 97� 12' 10" | Living | 12 | 1866 � 1999 | 235 |
| Fort Dufferin | Historical | 3 | 1723 - 1872 | |||
| Assiniboine River alluvial logs | Various locations | Subfossil | 37 | 1286 - 1968 | ||
| Red River alluvial logs | Various locations | Subfossil | 44 | 1448 - 1997 | ||
|
To read or view the full study, please visit the
Ideal website. It was published in Quaternary Research, Volume 58, pp. 103-111, September 2002. |
|
Contact Us National Oceanic and Atmospheric Administration 13 September 2002
|