[Eoas-seminar] MET MS Defense - Hong Chen - 2/26 - 3:30 PM - LOV 353

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Wed Feb 18 16:10:11 EST 2015


Meteorology Seminar


Hong Chen



M.S. Meteorology Candidate
Major Professor:  Dr. Ming Cai



IMPACTS OF ORBITAL DRIFT AND ORBITAL DIFFERENCES ON SATELLITE-DERIVED TEMPERATURE TRENDS WITH AND WITHOUT DIURNAL CORRECTION


Thursday February 26th
3:30 PM





Werner A. Baum Seminar Room (353 Love Building)
(Please join us for refreshments served outside room 353 Love @ 3:00 PM)



ABSTRACT

The measurements from Microwave Sounding Unit (MSU) and Advanced Microwave Sounding Unit-A (AMSU-A) have been extensively used for atmospheric temperature trend study during the last several decades. The existences of inter-sensor biases and orbital drift and orbital differences among different satellites are two major challenges for climate study using long-term time series of measurements from MSU and AMSU-A instruments onboard multiple satellites that were launched successively over the past 30 more years.  In this study, the impacts of orbital drift and orbital differences of satellites on AMSU-A derived trends are investigated. The AMSU-A near-nadir observations over Amazon rainforest from NOAA-15, NOAA-18, NOAA-19, and MetOp-A during 1998 - 2014 are employed. The double difference method is firstly applied to obtain the estimates of inter-sensor biases for each paired AMSU-A instruments, in which NOAA-18 is used as a reference satellite. The inter-calibrated observations from the four satellites mentioned above are used to calculate monthly mean diurnal cycles of brightness temperature over Amazon rainforest for each of the 15 AMSU-A channels. The diurnal correction method is then applied to all AMSU-A data using the estimated diurnal-cycle variations in order to obtain corrected data valid at the same local time. Finally, it is shown that the inter-sensor bias correction and diurnal correction have significant impacts on the AMSU-A derived long-term atmospheric temperature trends.


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