Tree-Ring Drought Atlas Portal

A map of the December-February Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of the Settlement Drought from 1791-1792.

Settlement Drought 1791-1792
December-February PDSI

Eastern Australia and New Zealand Drought Atlas

Reconstruction: Summer (December-February) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 1500-2012

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A composite map of the June-August Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of "Schubert" Drought Years (1875, 1891, 1892, 1897, 1901, 1906, 1911, 1920, 1921, and 1924).

"Schubert" Drought Years (1875, 1891, 1892, 1897, 1901, 1906, 1911, 1920, 1921, and 1924)
June-August PDSI

European Russia Drought Atlas

Reconstruction: Summer (June-August) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 1400-2016

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A composite map of the June-August Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of the Spanish Conquest Drought from 1521-1524.

Spanish Conquest Drought 1521-1524
June-August PDSI

Mexican Drought Atlas

Reconstruction: Summer (June-August) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 1400-2012

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A composite map of the June-August Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of The Great Drought from 1876-1878.

The Great Drought 1876-1878
June-August PDSI

Monsoon Asia Drought Atlas

Reconstruction: Summer (June-August) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 2.5°

Time Period: AD 1300-2005

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A composite map of the June-August Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of the Civil War Drought from 1856-1865.

Civil War Drought 1856-1865
June-August PDSI

North American Drought Atlas

Reconstruction: Summer (June-August) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 0000-2005

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A composite map of Standardized Precipitation Indices showing the spatial coverage of the of the 16th Century Megadrought with poorer quality grid points removed in gray.

16th Century Megadrought
Poorer Quality Grid Points Removed (gray)

North American Seasonal Precipitation Atlas

Reconstruction: Cool Season (December-April) and Warm Season (May-July) Total Precipitation and Standardized Precipitation Index (SPI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 0000-2016

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A map of the June-August Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of the 1540 Drought.

1540 Drought
June-August PDSI

Old World Drought Atlas

Reconstruction: Summer (June-August) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 0000-2012

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A composite map of the December-February Palmer Drought Severity Index reconstructed from tree rings showing the spatial coverage of the wet years in 1651 and 1723 that caused the Santa Fe City Floods (location denoted with an *).

Composite Map of Santa Fe City Floods (1651 and 1723)
* Denotes Location of the Floods
December-February PDSI

South American Drought Atlas

Reconstruction: Summer (December-February) self-calibrating Palmer Drought Severity Index (PDSI)

Latitude/Longitude Grid: 0.5°

Time Period: AD 1400-2000

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