scholarly journals Comparison of Global Observations and Trends of Total Precipitable Water Derived from Microwave Radiometers and COSMIC Radio Occultation from 2006 to 2013

2020 ◽  
Author(s):  
Shu-peng Ho ◽  
Liang Peng ◽  
Carl Mears ◽  
Richard A Anthes
Keyword(s):  
Radio Occultation ◽  
Precipitable Water ◽  
Cosmic Radio ◽  
Total Precipitable Water ◽  
Microwave Radiometers

scholarly journals Comparison of Global Observations and Trends of Total Precipitable Water Derived from Microwave Radiometers and COSMIC Radio Occultation from 2006 to 2013

2017 ◽  
Author(s):  
Shu-peng Ho ◽  
Liang Peng ◽  
Carl Mears ◽  
Richard A. Anthes
Keyword(s):  
Confidence Interval ◽  
Radio Occultation ◽  
Precipitable Water ◽  
Cosmic Radio ◽  
Total Precipitable Water ◽  
Temperature Feedback ◽  
Independent Observations ◽  
The Mean ◽  
Microwave Imager ◽  
Microwave Radiometers

Abstract. We compare atmospheric total precipitable water (TPW) derived from SSM/I (Special Sensor Microwave Imager) and SSMIS (Special Sensor Microwave Imager Sounder) radiometers and WindSat to collocated TPW estimates derived from COSMIC (Constellation System for Meteorology, Ionosphere and Climate) radio occultation (RO) under clear and cloudy conditions over the oceans from June 2006 to December 2013. Results show that the mean microwave (MW) radiometer – COSMIC TPW differences range from 0.06–0.18 mm for clear skies, 0.79–0.96 mm for cloudy skies, 0.46–0.49 mm for cloudy but non-precipitation conditions, and 1.64–1.88 mm for precipitation conditions. Because RO measurements are not significantly affected by clouds and precipitation, the biases mainly result from MW retrieval uncertainties under cloudy and precipitating conditions. All COSMIC and MW radiometers detect a positive TPW trend over these eight years. The trend using all COSMIC observations collocated with MW pixels is 1.79 mm/decade, with a 95 % confidence interval of (0.96, 2.63), which is in close agreement with the trend estimated by all MW observations (1.78 mm/decade with a 95 % confidence interval of 0.94, 2.62). These two trends from independent observations are larger than previous estimates and are a strong indication of the positive water vapor-temperature feedback in a warming planet.

scholarly journals Comparison of global observations and trends of total precipitable water derived from microwave radiometers and COSMIC radio occultation from 2006 to 2013

2018 ◽  
Vol 18 (1) ◽  
pp. 259-274 ◽  
Author(s):  
Shu-Peng Ho ◽  
Liang Peng ◽  
Carl Mears ◽  
Richard A. Anthes
Keyword(s):  
Confidence Interval ◽  
Close Agreement ◽  
Radio Occultation ◽  
Precipitable Water ◽  
Cosmic Radio ◽  
Data Set ◽  
Global Average ◽  
Total Precipitable Water ◽  
Independent Observations ◽  
Microwave Imager

Abstract. We compare atmospheric total precipitable water (TPW) derived from the SSM/I (Special Sensor Microwave Imager) and SSMIS (Special Sensor Microwave Imager/Sounder) radiometers and WindSat to collocated TPW estimates derived from COSMIC (Constellation System for Meteorology, Ionosphere, and Climate) radio occultation (RO) under clear and cloudy conditions over the oceans from June 2006 to December 2013. Results show that the mean microwave (MW) radiometer – COSMIC TPW differences range from 0.06 to 0.18 mm for clear skies, from 0.79 to 0.96 mm for cloudy skies, from 0.46 to 0.49 mm for cloudy but non-precipitating conditions, and from 1.64 to 1.88 mm for precipitating conditions. Because RO measurements are not significantly affected by clouds and precipitation, the biases mainly result from MW retrieval uncertainties under cloudy and precipitating conditions. All COSMIC and MW radiometers detect a positive TPW trend over these 8 years. The trend using all COSMIC observations collocated with MW pixels for this data set is 1.79 mm decade−1, with a 95 % confidence interval of (0.96, 2.63), which is in close agreement with the trend estimated by the collocated MW observations (1.78 mm decade−1 with a 95 % confidence interval of 0.94, 2.62). The sample of MW and RO pairs used in this study is highly biased toward middle latitudes (40–60∘ N and 40–65∘ S), and thus these trends are not representative of global average trends. However, they are representative of the latitudes of extratropical storm tracks and the trend values are approximately 4 to 6 times the global average trends, which are approximately 0.3 mm decade−1. In addition, the close agreement of these two trends from independent observations, which represent an increase in TPW in our data set of about 6.9 %, are a strong indication of the positive water vapor–temperature feedback on a warming planet in regions where precipitation from extratropical storms is already large.

Evaluation of daily and diurnal signals of total precipitable water (TPW) over the Indian Ocean based on TMI retrieved 3-day composite estimates and radiosonde data

2007 ◽  
Vol 27 (6) ◽  
pp. 761-770 ◽  
Author(s):  
V. Sajith ◽  
Jimmy O. Adegoke ◽  
Santosh K. Raghavan ◽  
H. S. Ram Mohan ◽  
Vinod Kumar ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Precipitable Water ◽  
Radiosonde Data ◽  
Total Precipitable Water ◽  
The Indian Ocean
Sign in / Sign up

Export Citation Format

Share Document