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result sql = Wildfire responses to abrupt climate change in North America.
Wildfire responses to abrupt climate change in North America.
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char = i;code = 105
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char = ;code = 32
char = c;code = 99
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char = a;code = 97
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char = ;code = 32
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char = o;code = 111
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char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = c;code = 99
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char = n;code = 110
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = o;code = 111
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char = r;code = 114
char = e;code = 101
char = -;code = 45
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char = g;code = 103
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char = c;code = 99
char = h;code = 104
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char = t;code = 116
char = ;code = 32
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char = n;code = 110
char = d;code = 100
char = i;code = 105
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char = d;code = 100
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char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
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char = s;code = 115
char = ;code = 32
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char = t;code = 116
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char = c;code = 99
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char = c;code = 99
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char = e;code = 101
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char = ;code = 32
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char = a;code = 97
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char = o;code = 111
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char = a;code = 97
char = n;code = 110
char = t;code = 116
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char = l;code = 108
char = e;code = 101
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char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = i;code = 105
char = m;code = 109
char = a;code = 97
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char = e;code = 101
char = ,;code = 44
char = ;code = 32
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char = ;code = 32
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char = t;code = 116
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char = a;code = 97
char = r;code = 114
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char = ;code = 32
char = r;code = 114
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char = d;code = 100
char = ;code = 32
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char = i;code = 105
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
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char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
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char = ;code = 32
char = b;code = 98
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char = d;code = 100
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char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
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result sql = It is widely accepted, based on data from the last few decades and on model simulations, that anthropogenic climate change will cause increased fire activity. However, less attention has been paid to the relationship between abrupt climate changes and heightened fire activity in the paleorecord. We use 35 charcoal and pollen records to assess how fire regimes in North America changed during the last glacial-interglacial transition (15 to 10 ka), a time of large and rapid climate changes. We also test the hypothesis that a comet impact initiated continental-scale wildfires at 12.9 ka; the data do not support this idea, nor are continent-wide fires indicated at any time during deglaciation. There are, however, clear links between large climate changes and fire activity. Biomass burning gradually increased from the glacial period to the beginning of the Younger Dryas. Although there are changes in biomass burning during the Younger Dryas, there is no systematic trend. There is a further increase in biomass burning after the Younger Dryas. Intervals of rapid climate change at 13.9, 13.2, and 11.7 ka are marked by large increases in fire activity. The timing of changes in fire is not coincident with changes in human population density or the timing of the extinction of the megafauna. Although these factors could have contributed to fire-regime changes at individual sites or at specific times, the charcoal data indicate an important role for climate, and particularly rapid climate change, in determining broad-scale levels of fire activity.

Publication: Proc. Natl. Acad. Sci. U.S.A. 2009 Feb 24 ;106(8)::2519-24. :doi: 10.1073/pnas.0808212106.
Publication Date: 2009 Feb 24
Study Author(s): Marlon, J R;Bartlein, P J;Walsh, M K;Harrison, S P;Brown, K J;Edwards, M E;Higuera, P E;Power, M J;Anderson, R S;Briles, C;Brunelle, A;Carcaillet, C;Daniels, M;Hu, F S;Lavoie, M;Long, C;Minckley, T;Richard, P J H;Scott, A C;Shafer, D S;Tinner, W;Umbanhowar, C E;Whitlock, C;
Institution: Department of Geography, University of Oregon, Eugene, OR 97403, USA. [email protected]
Shortcut link to this study:
It is widely accepted, based on data from the last few decades and on model simulations, that anthropogenic climate change will cause increased fire activity. However, less attention has been paid to the relationship between abrupt climate changes and heightened fire activity in the paleorecord. We use 35 charcoal and pollen records to assess how fire regimes in North America changed during the last glacial-interglacial transition (15 to 10 ka), a time of large and rapid climate changes. We also test the hypothesis that a comet impact initiated continental-scale wildfires at 12.9 ka; the data do not support this idea, nor are continent-wide fires indicated at any time during deglaciation. There are, however, clear links between large climate changes and fire activity. Biomass burning gradually increased from the glacial period to the beginning of the Younger Dryas. Although there are changes in biomass burning during the Younger Dryas, there is no systematic trend. There is a further increase in biomass burning after the Younger Dryas. Intervals of rapid climate change at 13.9, 13.2, and 11.7 ka are marked by large increases in fire activity. The timing of changes in fire is not coincident with changes in human population density or the timing of the extinction of the megafauna. Although these factors could have contributed to fire-regime changes at individual sites or at specific times, the charcoal data indicate an important role for climate, and particularly rapid climate change, in determining broad-scale levels of fire activity.
PMID: 19190185

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