Aquarius Algorithm Workshop 18-20 March 2007

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School of Engineering Department of Atmospheric, Oceanic & Space Sciences Aquarius Algorithm Workshop 18-20 March 2007 Antenna Sidelobe Correction for Land Contamination Chris Ruf Space Physics Research Laboratory Dept. of Atmospheric, Oceanic & Space Sciences University of Michigan cruf@umich.edu, 734-764-6561 (V), 734-936-0503 (F)

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Contributions to Antenna Temperature

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General Description of Algorithm Model T B entering recieving wire from Earth at all view blessed messengers Derive display from satellite radiometer perceptions Stratify by lat/lon of reception apparatus, obs. recurrence, time of year Derive sidelobe commitment to T An as reception apparatus design weighted normal Incorporate enhanced information of sidelobe commitment into standard APC calculation

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Heritage with Other Flight Projects Obligis, E., L. Eymard and N. Tran, "another sidelobe remedy calculation for microwave radiometers: Application to the Envisat instrument," IEEE Trans. Geosci. Remote Sens ., 45 (3), 2007. Utilize 1 year of Envisat nadir TBs at 23.8 and 36.5 GHz Stratify via season – 4 time canisters Use nadir TBs straightforwardly in radio wire design weighted midpoints Incorporated into Envisat Level 1B operational handling in Nov. 2005 Developed with Jason Microwave Radiometer; Planned for AMR on OSTM (Jason-2); Shannon Brown lead Use 3 year JMR nadir TBs at 18.7, 23.8 and 34.0 GHz Derive model to evaluate off-nadir TB from nadir obs by relapse of reproduced database of TBs at numerous points from sea/atmos information record and radiative exchange demonstrate (over sea just)

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Brown JMR Results (1 of 3) ( ref . Cocoa, S., " Generate JMR TE Maps, " JPL Tech. Notice, 4 Apr 2006) Map of the 18.7 GHz nadir splendor temperature focused at LAT=35.5 o E, LON=17 o N. Inward dark circle speaks to 10 o off-nadir. External dark circle is the Earth appendage at 1338 km elevation, around 55 o off-nadir.

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Brown JMR Results (2 of 3) ( ref . Chestnut, S., " Generate JMR TE Maps, " JPL Tech. Reminder, 4 Apr 2006) Earth occurrence edge from point of view of 1338 km height over the ground at LAT=35.5 o E, LON=17 o N.

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Brown JMR Results (3 of 3) ( ref . Chestnut, S., " Generate JMR TE Maps, " JPL Tech. Update, 4 Apr 2006) (LEFT) Nadir TB perceptions at 18.7 GHz (RIGHT) Modeled upwelling TB from point of view of 1338 km elevation over the ground at LAT=35.5 o E, LON=17 o N. (Take note of: no change from nadir for land TBs)

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Aquarius Sidelobe Land Contribution (1 of 2) ( ref . Cocoa, S., " Aquarius APC, " JPL Aquarius TIM, 1 Feb 2006,) Aquarius required to recover saltiness > 450 km from drift All focuses in blue > 450 km from land

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Aquarius Sidelobe Land Contribution (2 of 2) ( ref . Chestnut, S., " Aquarius APC, " JPL Aquarius TIM, 1 Feb 2006,) Less than 10% of on-Earth sidelobe division ashore at 450 km (p1V) (Assumes learning of T Land is superior to 15 K)

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Aquarius Implementation Use SMOS perceptions to prepare T earth demonstrate Model for rate point reliance of TB over sea and land can be better compelled by obs Pre-dispatch recreations Build T earth database Assess affectability of rectification to mistakes in Integrated reception apparatus pillar parts T earth (occasional reliance, RFI impacts, other?)

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