Striping noise reduction for ATMS window channels using a modified destriping algorithm

作者：Zou X^*; Dong H; Qin Z

来源：Quarterly Journal of the Royal Meteorological Society, 2017, 143(707): 2567-2577.

DOI：10.1002/qj.3107

• striping reduction
• ATMS
• EEMD
• PCA

The Suomi National Polar-orbiting Partnership Advanced Technology Microwave Sounder (S-NPP ATMS) upper-air temperature sounding channels display a clear across-track striping noise in the numerical weather prediction observed minus background (NWP O-B) fields. The striping magnitude variation is much more significant in ATMS along track directions. Such a striping feature is also visible at brightness temperature fields at all 22 channels during an ATMS on-orbit pitch manoeuvre period. An algorithm was developed earlier by combining a principal component analysis (PCA) and ensemble empirical mode decomposition (EEMD) and worked well for reducing the striping noise at ATMS upper-air temperature sounding channels. However, at ATMS window channels (channels 1 and 2), artefacts were generated in the destriped observations at places where ATMS scanlines are aligned with either coastline curves or the edges of deep clouds. They are caused by the along-track sharp gradients of brightness temperatures at window channels when ATMS Earth scenes change from ocean to land or clear-sky to deep clouds and vice versa. Thus, an additional step is added to the PCA/EEMD method to eliminate such impacts. The modified destriping method performs well for reducing the striping noise at ATMS window channels without introducing the artefacts to the destriped brightness temperature fields.

• 出版日期2017-7