Weekly Gridded Aquarius L-Band Radiometer/Scatterometer Observations and Salinity Retrievals Over the Polar Regions - Part 2: Initial Product Analysis

Following the development and availability of Aquarius weekly polar-gridded products, this study presents the spatial and temporal radiometer and scatterometer observations at L band (frequency similar to 1.4 GHz) over the cryosphere including the Greenland and Antarctic ice sheets, sea ice in both...

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Bibliographic Details
Main Authors: Brucker, L., Dinnat, Emmanuel P., Koenig, L. S.
Format: Text
Language:unknown
Published: Chapman University Digital Commons 2014
Subjects:
Microwave Brightness Temperature
Greenland Ice-Sheet
Modeling Time-Series
Sea-Ice
Dome-C
Thickness Retrievall
Snow Accumulation
Antarctica
Variability
Emission
Glaciology
Oceanography
Antarctic
Arctic
Greenland
The Antarctic
Antarc*
Ice Sheet
Sea ice
Online Access:https://digitalcommons.chapman.edu/sees_articles/66
https://digitalcommons.chapman.edu/cgi/viewcontent.cgi?article=1059&context=sees_articles
Description
Summary:Following the development and availability of Aquarius weekly polar-gridded products, this study presents the spatial and temporal radiometer and scatterometer observations at L band (frequency similar to 1.4 GHz) over the cryosphere including the Greenland and Antarctic ice sheets, sea ice in both hemispheres, and over sub-Arctic land for monitoring the soil freeze/thaw state. We provide multiple examples of scientific applications for the L-band data over the cryosphere. For example, we show that over the Greenland Ice Sheet, the unusual 2012 melt event lead to an L-band brightness temperature (TB) sustained decrease of similar to 5K at horizontal polarization. Over the Antarctic ice sheet, normalized radar cross section (NRCS) observations recorded during ascending and descending orbits are significantly different, highlighting the anisotropy of the ice cover. Over sub-Arctic land, both passive and active observations show distinct values depending on the soil physical state (freeze/thaw). Aquarius sea surface salinity (SSS) retrievals in the polar waters are also presented. SSS variations could serve as an indicator of fresh water input to the ocean from the cryosphere, however the presence of sea ice often contaminates the SSS retrievals, hindering the analysis. The weekly grided Aquarius L-band products used are distributed by the US Snow and Ice Data Center at http: //nsidc.org/data/aquarius/index.html,and show potential for cryospheric studies.

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