noaa-recon-12908
Andes Temperate-Mediterranean Transition 657 Year PDSI Reconstruction
Christie, D.A.; Boninsegna, J.A.; Cleaveland, M.K.; Lara, A.; Le Quesne, C.; Morales, M.; Mudelsee, M.; Stahle, D.W.; Villalba, R.
Andes Temperate-Mediterranean Transition 657 Year PDSI Reconstruction
2012-05-03
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12908
Investigator
D.A.
Christie
Investigator
J.A.
Boninsegna
Investigator
M.K.
Cleaveland
Investigator
A.
Lara
Investigator
C.
Le Quesne
Investigator
M.
Morales
Investigator
M.
Mudelsee
Investigator
D.W.
Stahle
Investigator
R.
Villalba
earth science
paleoclimate
climate reconstructions|tree ring
age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null
earth science
paleoclimate
climate reconstructions|tree ring
Palmer Drought Severity Index,ring width,null,dimensionless,Dec,climate reconstructions|tree ring,null,principal component analysis|regression analysis,N,calibration data set: Dai et al. 2004; calibration period: 1960-2000 A.D.; principal components regression
earth science
paleoclimate
reconstructions
ground water
geoscientificInformation
Antarctic Oscillation (AAO)
ENSO
PAGES 2k Network
PAGES LOTRED SA2k
Palmer Drought Index Reconstruction
1346 AD
2002 AD
604 cal yr BP
-52 cal yr BP
Complete
-39.5
-35.5
-72
-68
Continent
South America
Chile
Andes Temperate-Mediterranean Transition zone>LATITUDE >LONGITUDE
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Christie, D.A., J.A. Boninsegna, M.K. Cleaveland, A. Lara, C. Le Quesne,
M.S. Morales, M. Mudelsee, D.W. Stahle, and R. Villalba. 2011.
Aridity changes in the Temperate-Mediterranean transition
of the Andes since ad 1346 reconstructed from tree-rings.
Climate Dynamics, Vol. 36, Numbers 7-8, pp. 1505-1521,
DOI: 10.1007/s00382-009-0723-4
The Andes Cordillera acts as regional "Water Towers" for several
countries and encompasses a wide range of ecosystems and climates.
Several hydroclimatic changes have been described for portions of
the Andes during recent years, including glacier retreat,
negative precipitation trends, an elevation rise in the 0° isotherm,
and changes in regional streamflow regimes. The Temperate-Mediterranean
transition (TMT) zone of the Andes (35.5°-39.5°S) is particularly
at risk to climate change because it is a biodiversity hotspot
with heavy human population pressure on water resources. In this
paper we utilize a new tree-ring network of Austrocedrus chilensis
to reconstruct past variations in regional moisture in the TMT
of the Andes by means of the Palmer Drought Severity Index (PDSI).
The reconstruction covers the past 657 years and captures interannual
to decadal scales of variability in late spring-early summer PDSI.
These changes are related to the north-south oscillations in moisture
conditions between the Mediterranean and Temperate climates of the
Andes as a consequence of the latitudinal position of the storm tracks
forced by large-scale circulation modes. Kernel estimation of
occurrence rates reveals an unprecedented increment of severe
and extreme drought events during the last century in the context
of the previous six centuries. Moisture conditions in our study
region are linked to tropical and high-latitude ocean-atmospheric
forcing, with PDSI positively related to Nino-3.4 SST during spring
and strongly negatively correlated with the Antarctic Oscillation
(AAO) during summer. Geopotential anomaly maps at 500-hPa show that
extreme dry years are tightly associated with negative height
anomalies in the Ross-Amundsen Seas, in concordance with the strong
negative relationship between PDSI and AAO. The twentieth century
increase in extreme drought events in the TMT may not be related
to ENSO but to the positive AAO trend during late-spring and summer
resulting from a gradual poleward shift of the mid-latitude storm
tracks. This first PDSI reconstruction for South America demonstrates
the highly significant hindcast skill of A. chilensis as an aridity
proxy.
STUDY NOTES: Reconstruction of Palmer Drought Severity Index (PDSI) for the southern Andes
Temperate-Mediterranean Transition zone (~35.5°-39.5°S) for the past 657 years.
The reconstruction is based on a six site network of Austrocedrus chilensis
tree-ring widths.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/southamerica/andes2011pdsi.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/southamerica/andes2011pdsi.xls
USA/NOAA
DIF
Version 9.8.4
2019-06-18
2019-06-18