Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, Epiciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Verification and recalibration of HY-2A microwave radiometer brightness temperature

Abstract : HY-2A is the first one of the Chinese HY-2 ocean satellite series carrying a microwave radiometer (RM) to measure sea surface temperature, sea surface wind speed, atmospheric water vapor, cloud liquid water content, and rain rate. We verified the RM level 1B brightness temperature ( T B) to retrieve environmental parameters. In the verification, T B that simulated using the ocean-atmosphere radiative transfer model (RTM) was used as a reference. The total bias and total standard deviation (SD) of the RM level 1B T B, with reference to the RTM simulation, ranged -20.6-4.38 K and 0.7-2.93 K, respectively. We found that both the total bias and the total SD depend on the frequency and polarization, although the values for ascending and descending passes are different. In addition, substantial seasonal variation of the bias was found at all channels. The verification results indicate the RM has some problems regarding calibration, e.g., correction of antenna spillover and antenna physical emission, especially for the 18.7-GHz channel. Based on error analyses, a statistical recalibration algorithm was designed and recalibration was performed for the RM level 1B T B. Validation of the recalibrated T B indicated that the quality of the recalibrated RM level 1B T B was improved significantly. The bias of the recalibrated T B at all channels was reduced to <0.4 K, seasonal variation was almost eradicated, and SD was diminished (i.e., the SD of the 18.7-GHz channel was reduced by more than 0.5 K).
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03683192
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Tuesday, May 31, 2022 - 3:03:59 PM
Last modification on : Wednesday, June 1, 2022 - 3:39:00 AM

Links full text

Identifiers

Collections

Citation

yili Zhao, Huimin Li, Chuntao Chen, Jianhua Zhu. Verification and recalibration of HY-2A microwave radiometer brightness temperature. Journal of Oceanology and Limnology, 2019, 37, pp.968-981. ⟨10.1007/s00343-019-8073-5⟩. ⟨insu-03683192⟩

Share

Metrics

Record views

1