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First Global Measurement of Cloud Ice in Upper Troposphere

The amounts of water vapor, rainfall and cloud amounts in the tropics all play a role in the Earth's climate. Scientists compare their results with  Aura Microwave Limb Sounder (MLS)  observations, and until now, upper tropospheric cloud ice has been an "unconstrained parameters" in most climate models. This means that different models calculate different values, but there were no observations so no one could tell if their model made sense or not.

Cloud ice measurement will improve global circulation models used for weather and climate forecasts. The measurements will also help quantify the upper tropospheric (UT) hydrological cycle, including water vapor feedbacks on climate change.

This measurement shows that cloud ice is more frequently seen over warm oceans.
This measurement shows that cloud ice is more frequently seen over warm oceans. Not unexpected, warm oceans lead to stronger convection and the lofting of water and ice into the upper troposphere. The break point is near 300K SST where there is significantly more water in the upper troposphere. This additional water and ice acts as a greenhouse gas blocking radiation from escaping to space. This slide suggests that warmer oceans will lead to more trapping of radiation leading to warmer oceans... a positive feedback.

6.28.06

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MLS

Aura’s Microwave Limb Sounder (MLS) instrument uses microwave emission to measure stratospheric temperature and upper tropospheric constituents. MLS also has unique capability to measure upper tropospheric water vapor in the…

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