noaa-model-9818
Support for Global Climate Reorganization During the MCA
Graham, N.E.; Ammann, C.M.; Fleitmann, D.; Cobb, K.M.; Luterbacher, J.
Support for Global Climate Reorganization During the MCA
2010-11-15
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9818
Investigator
N.E.
Graham
Investigator
C.M.
Ammann
Investigator
D.
Fleitmann
Investigator
K.M.
Cobb
Investigator
J.
Luterbacher
earth science
paleoclimate
paleoclimatic modeling
latitude,null,null,degree north,null,paleoclimatic modeling,null,null,N,null
earth science
paleoclimate
paleoclimatic modeling
precipitation,null,null,dimensionless,Jun-Sep,paleoclimatic modeling,anomalized,null,N,ratio experiment/control
earth science
paleoclimate
paleoclimatic modeling
temperature,null,null,kelvin,Jun-Sep,paleoclimatic modeling,anomalized,null,N,difference experiment-control
earth science
paleoclimate
paleoclimatic modeling
temperature,null,null,kelvin,Dec-Mar,paleoclimatic modeling,anomalized,null,N,difference experiment-control
earth science
paleoclimate
paleoclimatic modeling
sea level pressure,null,null,hectopascal,Jun-Sep,paleoclimatic modeling,anomalized,null,N,difference experiment-control
earth science
paleoclimate
paleoclimatic modeling
precipitation,null,null,dimensionless,Dec-Mar,paleoclimatic modeling,anomalized,null,N,ratio experiment/control
earth science
paleoclimate
paleoclimatic modeling
sea level pressure,null,null,hectopascal,Dec-Mar,paleoclimatic modeling,anomalized,null,N,difference experiment-control
earth science
paleoclimate
paleoclimatic modeling
longitude,null,null,degree east,null,paleoclimatic modeling,null,null,N,null
earth science
paleoclimate
model
atmosphere model
geoscientificInformation
Medieval Warm Period
Complete
-90
90
-180
180
Geographic Region
Global
Global>LATITUDE >LONGITUDE
None
Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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
Graham, N.E., C.M. Ammann, D. Fleitmann, K.M. Cobb and J. Luterbacher. 2010.
Support for global climate reorganization during the "Medieval Climate Anomaly".
Climate Dynamics. DOI: 10.1007/s00382-010-0914-z
Widely distributed proxy records indicate that the Medieval Climate Anomaly
(MCA; ~900-1350 AD) was characterized by coherent shifts in large-scale
Northern Hemisphere atmospheric circulation patterns. Although cooler
sea surface temperatures in the central and eastern equatorial Pacific
can explain some aspects of medieval circulation changes, they are not
sufficient to account for other notable features, including widespread
aridity through the Eurasian sub-tropics, stronger winter westerlies
across the North Atlantic and Western Europe, and shifts in monsoon
rainfall patterns across Africa and South Asia. We present results from
a full-physics coupled climate model showing that a slight warming of
the tropical Indian and western Pacific Oceans relative to the other
tropical ocean basins can induce a broad range of the medieval circulation
and climate changes indicated by proxy data, including many of those not
explained by a cooler tropical Pacific alone. Important aspects of the
results resemble those from previous simulations examining the climatic
response to the rapid Indian Ocean warming during the late twentieth
century, and to results from climate warming simulations - especially
in indicating an expansion of the Northern Hemisphere Hadley circulation.
Notably, the pattern of tropical Indo-Pacific sea surface temperature (SST)
change responsible for producing the proxy-model similarity in our results
agrees well with MCA-LIA SST differences obtained in a recent proxy-based
climate field reconstruction. Though much remains unclear, our results
indicate that the MCA was characterized by an enhanced zonal Indo-Pacific
SST gradient with resulting changes in Northern Hemisphere tropical and
extra-tropical circulation patterns and hydroclimate regimes, linkages
that may explain the coherent regional climate shifts indicated by proxy
records from across the planet. The findings provide new perspectives
on the nature and possible causes of the MCA - a remarkable, yet
incompletely understood episode of Late Holocene climatic change.
STUDY NOTES: Model output for the IOWP25 Medieval Climate Anomaly simulation
from Graham et al. 2010, in netCDF format.
Files and contents are as follows:
pcp_ratio_djfm.nc: Ratio of December–March precipitation, IOWP25/CNTL
(expressed as fraction of CNTL), as plotted in Fig. 6.
slp_diff_djfm.nc: Differences in December–March Sea Level Pressure (hPa)
IOWP25 - CNTL, as plotted in Fig. 6.
tdiff_djfm.nc: Differences in December–March temperature between
the IOWP25 and CNTL simulations (C), as plotted in Fig. 7.
pcp_ratio_jjas.nc: IOWP25-CNTL ratio of summer (June-September) precipitation
(expressed as fraction of CNTL), as plotted in Fig. 8
slp_diff_jjas.nc: IOWP25-CNTL differences in summer (June-September)
Sea Level Pressure, as plotted in Fig. 8.
tdiff_jjas.nc: Differences in June–September temperature (IOWP25-CNTL)
as plotted in Fig. 9
graham-2010-fig5-corrected.gif: corrected version of figure 5,
updated 28 October 2010 (An incorrect version of Figure 5 was published
in Graham et al. 2010).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/tdiff_djfm.nc
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/pcp_ratio_jjas.nc
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/readme-graham2010.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/pcp_ratio_djfm.nc
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/slp_diff_jjas.nc
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/slp_diff_djfm.nc
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/graham2010/tdiff_jjas.nc
USA/NOAA
DIF
Version 9.8.4
2019-02-01
2019-02-01