Sentences with phrase «passive microwave data»

Several algorithms exist to calculate the sea ice concentration from passive microwave data.

Despite the limitations in passive microwave data, they still yield good large - scale estimates for the overall extent pattern and values of the ice.

The NSIDC Sea Ice Index monthly ice extent, and the satellite passive microwave data sets upon which it is based, is one example.

Satellite passive microwave data since the 1970s indicate a 3 % decrease per decade in arctic sea ice extent.

``... using passive microwave data it is very easy to tell the difference between ice and water as the dielectric constant differs quite a bit and this is reflected in large differences in the microwave emission.

Christopher A. Shuman Research Scientist, NASA Goddard Space Flight Center Specialties: Ice elevation changes and glacier mass losses using altimetry in combination with other remote sensing in the Antarctica Peninsula, the accuracy of early ICESat - 1 data, composite temperature records derived from AWS passive microwave data from SMMR and SSM / I and IR data from AVHRR

Indeed, section 4.4.2.1 of AR4 WGI says «The most composite record of sea ice extent is provided by passive microwave data from satellites that are available since the early 1970s.»

The daily image is derived from remotely sensed passive microwave data, which can be collected even during cloudy or dark conditions.

While passive microwave data products may not show as much detail or be as accurate «on the ground» as other satellite data, they provide a consistent time series to track sea ice extent going back to 1979.

Arctic sea ice concentration from operational ice charts and satellite passive microwave data.

NIC utilizes visible imagery, passive microwave data, and NIC weekly analysis products to create their data product.

The passive microwave data show very little long - term trend.

A final note, once melt begins, the passive microwave data underestimates the true ice area (which is one reason why NSIDC only reports the extent in the sea ice news and analysis site, as it's a more reliable metric).

Reasons that passive microwave data may not detect ice include the presence of thin, newly formed ice; the shift in albedo of actively melting ice; and atmospheric interference.