Author: Paul D. Henne
Publisher:
ISBN: 9780542988684
Category :
Languages : en
Pages : 242
Book Description
Recent declines in the amount and duration of snow in the Northern Hemisphere are anticipated to continue as a result of greenhouse warming. The consequences of such changes for northern forests are uncertain. The Great Lakes region offers a unique setting to examine spatial and temporal variability in snowfall abundance and the impact of such variability on vegetational distributions. Lake-effect snowfall produces a threefold gradient (100--300 cm) in this region. I compared the importance of lake-effect snow relative to a suite of environmental factors as a predictor mesic-species abundance using a geographic information system and predictive modeling. Lake-effect snow, not soil texture, is the dominant control of regional mesic-forest distribution on the modern landscape. Mesic species dominate on all landform types (e.g. till, outwash) inside the lake-effect snowbelt, whereas they are restricted to fine-textured landforms outside the snowbelt. I also determined when lake-effect snowbelts developed during the Holocene by comparing oxygen-isotope data from one snowbelt and one non-snowbelt lake. These sites share similar climatic histories during the early Holocene. However, between 8500 and 5500 cal yr B.P., increasing lake-effect snow caused 18O-depletion at the snowbelt lake relative to the non-snowbelt lake, with the largest changes occurring after 6900 cal yr B.P. These differences lessened after 5500 cal yr B.P. but the snowbelt site continued to receive more snowfall. I integrated these isotopic data with pollen analysis from two snowbelt and two non-snowbelt lakes. One lake in each snowfall regime is situated on till and the other on outwash. Vegetational change was synchronous among these sites during the early Holocene prior to snowbelt development. A shift to mesic-hardwood forests after 5500 cal yr B.P. occurred only at the snowbelt sites. Snowfall variability was a more important constraint on vegetational change than edaphic variation.
Spatial and Temporal Variation in Lake-effect Snow Control Vegetational Distributions in the Great Lakes Region
Author: Paul D. Henne
Publisher:
ISBN: 9780542988684
Category :
Languages : en
Pages : 242
Book Description
Recent declines in the amount and duration of snow in the Northern Hemisphere are anticipated to continue as a result of greenhouse warming. The consequences of such changes for northern forests are uncertain. The Great Lakes region offers a unique setting to examine spatial and temporal variability in snowfall abundance and the impact of such variability on vegetational distributions. Lake-effect snowfall produces a threefold gradient (100--300 cm) in this region. I compared the importance of lake-effect snow relative to a suite of environmental factors as a predictor mesic-species abundance using a geographic information system and predictive modeling. Lake-effect snow, not soil texture, is the dominant control of regional mesic-forest distribution on the modern landscape. Mesic species dominate on all landform types (e.g. till, outwash) inside the lake-effect snowbelt, whereas they are restricted to fine-textured landforms outside the snowbelt. I also determined when lake-effect snowbelts developed during the Holocene by comparing oxygen-isotope data from one snowbelt and one non-snowbelt lake. These sites share similar climatic histories during the early Holocene. However, between 8500 and 5500 cal yr B.P., increasing lake-effect snow caused 18O-depletion at the snowbelt lake relative to the non-snowbelt lake, with the largest changes occurring after 6900 cal yr B.P. These differences lessened after 5500 cal yr B.P. but the snowbelt site continued to receive more snowfall. I integrated these isotopic data with pollen analysis from two snowbelt and two non-snowbelt lakes. One lake in each snowfall regime is situated on till and the other on outwash. Vegetational change was synchronous among these sites during the early Holocene prior to snowbelt development. A shift to mesic-hardwood forests after 5500 cal yr B.P. occurred only at the snowbelt sites. Snowfall variability was a more important constraint on vegetational change than edaphic variation.
Publisher:
ISBN: 9780542988684
Category :
Languages : en
Pages : 242
Book Description
Recent declines in the amount and duration of snow in the Northern Hemisphere are anticipated to continue as a result of greenhouse warming. The consequences of such changes for northern forests are uncertain. The Great Lakes region offers a unique setting to examine spatial and temporal variability in snowfall abundance and the impact of such variability on vegetational distributions. Lake-effect snowfall produces a threefold gradient (100--300 cm) in this region. I compared the importance of lake-effect snow relative to a suite of environmental factors as a predictor mesic-species abundance using a geographic information system and predictive modeling. Lake-effect snow, not soil texture, is the dominant control of regional mesic-forest distribution on the modern landscape. Mesic species dominate on all landform types (e.g. till, outwash) inside the lake-effect snowbelt, whereas they are restricted to fine-textured landforms outside the snowbelt. I also determined when lake-effect snowbelts developed during the Holocene by comparing oxygen-isotope data from one snowbelt and one non-snowbelt lake. These sites share similar climatic histories during the early Holocene. However, between 8500 and 5500 cal yr B.P., increasing lake-effect snow caused 18O-depletion at the snowbelt lake relative to the non-snowbelt lake, with the largest changes occurring after 6900 cal yr B.P. These differences lessened after 5500 cal yr B.P. but the snowbelt site continued to receive more snowfall. I integrated these isotopic data with pollen analysis from two snowbelt and two non-snowbelt lakes. One lake in each snowfall regime is situated on till and the other on outwash. Vegetational change was synchronous among these sites during the early Holocene prior to snowbelt development. A shift to mesic-hardwood forests after 5500 cal yr B.P. occurred only at the snowbelt sites. Snowfall variability was a more important constraint on vegetational change than edaphic variation.
Dissertation Abstracts International
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 886
Book Description
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 886
Book Description
Origins of Temporal and Spatial Variability of Lake-effect Snow Structures
Weather and Climate of the Great Lakes Region
Author: Val L. Eichenlaub
Publisher: Notre Dame, Ind. : University of Notre Dame Press
ISBN:
Category : History
Languages : en
Pages : 360
Book Description
Probes climatic patterns in the Great Lakes, atmospheric controls, the ways in which the Great Lakes affect weather, and the role of man in altering the weather of the Great Lakes region.
Publisher: Notre Dame, Ind. : University of Notre Dame Press
ISBN:
Category : History
Languages : en
Pages : 360
Book Description
Probes climatic patterns in the Great Lakes, atmospheric controls, the ways in which the Great Lakes affect weather, and the role of man in altering the weather of the Great Lakes region.
Selected Water Resources Abstracts
Fish and Wildlife Resources of the Great Lakes Coastal Wetlands Within the United States: Overview
Author: Charles E. Herdendorf
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 488
Book Description
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 488
Book Description
Hydroclimatology of the Great Lakes Region of North America
Author: Julie A. Winkler
Publisher: Frontiers Media SA
ISBN: 2832505457
Category : Science
Languages : en
Pages : 243
Book Description
Publisher: Frontiers Media SA
ISBN: 2832505457
Category : Science
Languages : en
Pages : 243
Book Description
Great Lakes Collective Influences Upon the Evolution of Lake-effect Storms in the Western Great Lakes
Temporal Behavior of the Levels of Middle and Upper Great Lakes Reveals Major Space and Time Climate Differences During 1861-2001
Author: Stanley Alcide Changnon
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 40
Book Description
Effects of Winds and of Barometric Pressures on the Great Lakes
Author: John Fillmore Hayford
Publisher:
ISBN:
Category : Atmospheric pressure
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category : Atmospheric pressure
Languages : en
Pages : 168
Book Description