Image from TERRA
Thu, 05 Nov 2020 13:05 EST

Annapolis, Maryland; Norfolk, Virginia; and Miami were originally built and mapped to provide enough protection against flooding, but sea level rise has caused that buffer to shrink.

Image from TERRA
Thu, 22 Oct 2020 11:00 EDT

NASA scientists are combining data from water samples containing fish DNA with satellite data to find native fish and identify their habitats.

Image from TERRA
Fri, 25 Sep 2020 10:00 EDT

The August Complex Fire and others this fire season have been sending far-reaching plumes of wildfire smoke into the atmosphere that worsen air quality in California and beyond. Predicting where that smoke will travel and how bad the air will be downwind is a challenge, but Earth-observing satellites can help.

MISR Measures Drop in Cloud Height

Deseasonalized anomalies of global effective cloud-top height from the 10-year mean. Solid line: 12-month running mean of 10-day anomalies. Dotted line: linear regression. Gray error bars indicate the sampling error (±8 m) in the annual average.

Stereo measurements from the Multiangle Imaging SpectroRadiometer (MISR) on the Terra satellite show a decrease in global cloud height between March 2000 and February 2010. MISR records the height of the top, thick cloud (not thin clouds), the cloud layer that has he greatest influence on radiating longwave radiation (heat) to space. Lower clouds radiate more energy than higher clouds, so a drop in cloud height could help counter rising global temperatures. In this analysis, the change in cloud height was calculated by comparing heights for a given 10-day period with the average global height calculated for that time of year over the ten-year period. The greatest change-a drop of 80 meters below average-occurred in 2007 and 2008, during a strong La Niña event. The height difference between the 2000 and 2010 is 31 meters.  The observed trend is strongly influenced by the La Niña event and may disappear over time. If the trend persists, it would represent a strong negative feedback to global warming.


Davies, R. and Molloy, M. (2012, February 3). Global cloud height fluctuations measured by MISR on Terra from 2000 to 2010. Geophysical Research Letters, 39, L03701.

Tagged with: ,