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Help

Help

Help

Help

Help

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Color bar Help
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  • Blue represents Sea Salt Extinction Aerosol Optical Thickness (550 nm). Sea salt is churned up from the ocean by surface winds.
  • Red represents Dust Extinction Aerosol Optical Thickness (550 nm). Dust blows over the Saharan desert and often interacts with tropical cyclones.
  • Green represents the sum of Aerosol Optical Thickness for Organic Carbon, Black Carbon, and Sulfate. These emissions are the result of biomass burning (Organic and Black Carbon), fossil fuel emissions, and volcanoes (Sulfate).
Aerosol Optical Thickness (tau) is measured in units of 1. A transparency mask is applied at the low end of the scale to allow simultaneous visualization of all five variables.
The system provides access to data from the following collections:
  • CFSR
  • ERA Interim
  • MERRA2
  • MERRA

Monthly Anomaly Definition: The term anomaly means a departure from a reference value or long-term average. For example, a positive temperature anomaly indicates that the observed temperature was warmer than the reference value, while a negative anomaly indicates that the observed temperature was cooler than the reference value. The anomaly used in these plots uses the annual average monthly temperatures as the reference value subtracted from the monthly temperature of each month of the entire reanalysis period (e.g. 1980-2016).

(source https://www.ncdc.noaa.gov/monitoring-references/faq/anomalies.php)


Yearly Cycle Definition: The yearly cycle is the average of each month across the 35 years of the reanalyses. That is, January data displayed here is the average of all January data at the selected location.

The system provides access to the following variables:
  • Air Temperature
  • Eastward Near-Surface Wind
  • Eastward Wind
  • Evaporation
  • Geopotential Height
  • Northward Near-Surface Wind
  • Northward Wind
  • Ozone Mole Fraction
  • Precipitable Water
  • Precipitation
  • Relative Humidity
  • Surface Air Pressure
  • Surface Air Temperature
  • Total Cloud Fraction
Elevation is expressed in terms of pressure levels (Pa).
The actual month days used in the queries are independent of the month day chosen by the user.
The selected palette determines the color palette used in the map tiles returned from the WMS server.

Screen controls

  • Click the +/- buttons to zoom in and out.
  • Click the E button to zoom out to the full extent of the map.
  • Use the slider bar to zoom in and out in finer increments.
  • Use the <-> button to make the map full-screen.
  • Click the collection label in the lower-right corner to go to the web page for the collection.

Mouse controls

  • Click on any point in the map to pop up the location and value.
  • Double-click to zoom in on a specific point.
  • Click-drag to pan the map in any direction.
  • Shift-click-drag to zoom to a selection rectangle.
  • Analysis Plots Help