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NASA Distributed Active Archive Center (DAAC) at NSIDC

PARCA Data

Program for Arctic Regional Climate Assessment

Services for Analysis of the Greenland Environment (SAGE)

The Services for Analysis of the Greenland Environment (SAGE) adds analysis capabilities and a unique interface for specific Greenland data sets. It is a tool designed to help scientists access, integrate, and analyze data related to the history and status of Greenland's ice sheet in real time using timeseries, scatterplot, histogram, and box and whisker plots. Currently SAGE supports seven data sets. See Table 1 for a listing of those data sets.

Table 1. Data Sets Supported by SAGE
DIF ID
Data Set Title
NSIDC-0032
DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures
NSIDC-0066
AVHRR Polar Pathfinder Twice-Daily 5 km EASE-Grid Composites
NSIDC-0218
Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data
NSIDC-0301
AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures
NSIDC-0305
GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland
NSIDC-0342
Near-Real-Time DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures
MOD11A2
MODIS/Terra Land Surface Temperature & Emissivity 8-Day L3 Global 1 km SIN Grid V005

Sample Plots from the SAGE Interface

To give you an idea of what SAGE has to offer, below are some sample images of the different types of plots that can be generated using SAGE:

Time Series Plots

brightness temperature plot

Figure 1. Mean 19 GHz Brightness Temperature (Horizontal Polarization, Descending Pass) Time Series for Central Greenland from April through October 2005



snow melt

Figure 2. Snow Melt Daily Percent Time Series from May through October 2005



Histogram Bar Plot

histogram plot

Figure 3. Time Series of Histograms for Albedo from 1 July through 12 July 2000



Small Image Time Series Plot

small image time series plot

Figure 4. Small Image Time Series of Albedo from 1 July through 12 July 2000



Box and Wisker Plot

box and wisker plot

Figure 5. Box and Whisker Time Series of Albedo from 1 July through 12 July 2000



PoDAG SAGE Usability Testing Survey

Now that you have had a chance to look at SAGE, please consider taking our online SAGE Data and Features Survey. Your comments are instrumental in helping us design a useful portal for the study of Greenland’s ice mass balance, and we appreciate any time you may have to help us in achieving this goal.