# Last Glacial Maximum and MIS4 Northern Hemisphere Climate Model Data 
#----------------------------------------------------------------------- 
#                World Data Service for Paleoclimatology, Boulder 
#                                  and 
#                     NOAA Paleoclimatology Program 
#             National Centers for Environmental Information (NCEI)
#----------------------------------------------------------------------- 
# Template Version 3.0
# Encoding: UTF-8
# NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. 
# If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. 
#
# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/26612 
#       Description: NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/tulenko2020/readme-tulenko2020.txt
#       Description: NOAA location of the template
#
# Original_Source_URL:  
#       Description:
# 
# Description/Documentation lines begin with #
# Data lines have no #
#
# Archive: Paleoclimate Modeling
#
# Dataset DOI: 
#
# Parameter_Keywords: atmosphere model
#--------------------
# Contribution_Date
#	Date: 2020-02-04
#--------------------
# File_Last_Modified_Date
#	Date: 2019-02-04
#--------------------
# Title
#	Study_Name: Last Glacial Maximum and MIS4 Northern Hemisphere Climate Model Data  
#--------------------
# Investigators
#	Investigators: Tulenko, J.P.; Lofverstrom, M.; Briner, J.P.
#--------------------
# Description_Notes_and_Keywords
#	Description: Temperature and precipitation model simulations for the Last Glacial Maximum (21ka) and Marine Isotope Stage 4 (66ka). 
#	Output variables:
#	netcdf LGM_data_season {
#	dimensions:
#		lat = 64 ;
#		lon = 256 ;
#	variables:
#		double lat(lat) ;
#			lat:long_name = "latitude" ;
#			lat:units = "degrees_north" ;
#			lat:axis = "Y" ;
#		double lon(lon) ;
#			lon:long_name = "longitude" ;
#			lon:units = "degrees_east" ;
#			lon:axis = "X" ;
#		float TOPO(lat, lon) ;
#			TOPO:_FillValue = 1.e+20f ;
#			TOPO:long_name = "Topography" ;
#			TOPO:units = "m" ;
#		float LANDFRAC(lat, lon) ;
#			LANDFRAC:_FillValue = 1.e+20f ;
#			LANDFRAC:long_name = "Land-ocean mask" ;
#			LANDFRAC:units = "binary" ;
#		float PRECT_ANN(lat, lon) ;
#			PRECT_ANN:_FillValue = 1.e+20f ;
#			PRECT_ANN:long_name = "Precipitation (ANN)" ;
#			PRECT_ANN:units = "mm/s" ;
#		float PRECT_JJA(lat, lon) ;
#			PRECT_JJA:_FillValue = 1.e+20f ;
#			PRECT_JJA:long_name = "Precipitation (JJA)" ;
#			PRECT_JJA:units = "mm/s" ;
#		float PRECT_DJF(lat, lon) ;
#			PRECT_DJF:_FillValue = 1.e+20f ;
#			PRECT_DJF:long_name = "Precipitation (DJF)" ;
#			PRECT_DJF:units = "mm/s" ;
#		float PRECT_Annual(lat, lon) ;
#			PRECT_Annual:_FillValue = 1.e+20f ;
#			PRECT_Annual:long_name = "Precipitation (annual)" ;
v		PRECT_Annual:units = "mm" ;
#		float TS_ANN(lat, lon) ;
#			TS_ANN:_FillValue = 1.e+20f ;
#			TS_ANN:long_name = "Surface temperature (JJA)" ;
#			TS_ANN:units = "degC" ;
#		float TS_JJA(lat, lon) ;
#			TS_JJA:_FillValue = 1.e+20f ;
#			TS_JJA:long_name = "Surface temperature (JJA)" ;
#			TS_JJA:units = "degC" ;
#		float TS_DJF(lat, lon) ;
#			TS_DJF:_FillValue = 1.e+20f ;
#			TS_DJF:long_name = "Surface temperature (DJF)" ;
#			TS_DJF:units = "degC" ;
#	
#	// global attributes:
#			:_NCProperties = "version=1|netcdflibversion=4.6.1|hdf5libversion=1.10.2" ;
#			:Conventions = "CF-1" ;
#	}
#
#--------------------
# Publication 
#	Authors: Joseph P. Tulenko, Marcus Lofverstrom, Jason P. Briner
#	Published_Date_or_Year: 2020-03-15  
#	Published_Title: Ice sheet influence on atmospheric circulation explains the patterns of Pleistocene alpine glacier records in North America
#	Journal_Name: Earth and Planetary Science Letters
#	Volume: 534
#	Edition: 116115
#	Issue: 15
#	Pages:
#	Report_Number: 
#	DOI: 10.1016/j.epsl.2020.116115
#	Online_Resource: https://www.sciencedirect.com/science/article/pii/S0012821X20300583
#	Full_Citation: 
#	Abstract: We explore the hypothesis that the relative size of Pleistocene ice sheets in North America modulated regional climate and alpine glaciation. We compare Pleistocene alpine glacier chronologies across North America with a comprehensive general circulation model using reconstructed ice sheet extents at peak glacial conditions during Marine Isotope Stage (MIS) 2 and MIS 4. The effect of continent-wide ice sheets on atmospheric circulation during MIS 2 led to warming in Beringia and cooling in the western US; less expansive ice sheets during MIS 4 resulted in weaker ice sheet modulation of atmospheric circulation. This led to preservation of MIS 4 moraines in Beringia due to limited MIS 2 glaciation (resulting in a MIS 2/4 moraine sequence) and overriding of MIS 4 moraines - for sites with existing chronologies - in the western United States during MIS 2 (resulting in a MIS 2/6 moraine sequence). Our results highlight how influential ice sheets are for regional climate conditions.
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# Funding_Agency 
#	Funding_Agency_Name: Swedish National Infrastructure for Computing
#	Grant: 
#------------------
# Site_Information 
#	Site_Name: Global
#	Location: Geographic Region>Global
#	Country:  
#	Northernmost_Latitude: 90
# 	Southernmost_Latitude: 0
# 	Easternmost_Longitude: 180
# 	Westernmost_Longitude: -180
# 	Elevation:  
#------------------
# Data_Collection   
#	Collection_Name: Tulenko2019 
#	Earliest_Year: 66000
#	Most_Recent_Year: 21000
#	Time_Unit: Cal. Year BP
#	Core_Length: 
#	Notes: 
#------------------
# Chronology_Information
#	Chronology: 
# 	
#----------------	
# Variables 
#
# Data variables follow are preceded by "##" in columns one and two.
# Data line variables format:  one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) 
#
## LANDFRAC	surface type,,,,,,,,N,binary; 1 = Land, 0 = Ocean
## lat	latitude,,,degree north,,paleoclimatic modeling,,,N,
## long	longitude,,,degree east,,paleoclimatic modeling,,,N,
## PRECT ANN	precipitation,,,millimeter per second,annual,paleoclimatic modeling,,,N,
## PRECT Annual	precipitation,,,millimeter,annual,paleoclimatic modeling,,,N,
## PRECT DJF	precipitation,,,millimeter per second,Dec-Feb,paleoclimatic modeling,,,N,
## PRECT JJA	precipitation,,,millimeter per second,Jun-Jul,paleoclimatic modeling,,,N,
## TOPO	collection elevation,,,meter,,paleoclimatic modeling,,,N,
## TS ANN	air temperature,,,degrees Celcius,annual,paleoclimatic modeling,,,N,
## TS DJF	air temperature,,,degrees Celcius,Dec-Feb,paleoclimatic modeling,,,N,
## TS JJA	air temperature,,,degrees Celcius,Jun-Jul,paleoclimatic modeling,,,N,	
#
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# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Values:  
#  See netCDF files:  https://www1.ncdc.noaa.gov/pub/data/paleo/gcmoutput/tulenko2020/
#