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Zhou Y.,PLA University of Science and Technology | Zhou Y.,Beijing Institute of Aeronautical Meteorology | Bai J.,Beijing Institute of Aeronautical Meteorology | Zhou Z.,Beijing Institute of Aeronautical Meteorology | Qi L.,Beijing Institute of Aeronautical Meteorology
Journal of Remote Sensing | Year: 2014

The Aerosol Optical Depth (AOD) retrieval algorithm for sand-dust weather over ocean is investigated using FY-3A/Medium Resolution Spectral imager (MERSI) based on aerosol modes in the MODIS C005 over-ocean algorithm. The AOD (550 nm) retrieved from MERSI is evaluated with MODIS AOD product (MOD04). Results show a systematic bias in this algorithm. Further analyses reveal that this bias results from the MODIS-available aerosol modes. Therefore, a sand-dust aerosol mode is adopted to modify the MODIS aerosol modes by mixing them at an appropriate ratio. AOD is retrieved a second time based on the modified aerosol modes, and the corresponding results exhibit good consistency with MOD04, indicating that modified aerosol modes are more appropriate for the AOD retrieval from MERSI for sand-dust weather over ocean.

Xiaodan W.,PLA University of Science and Technology | Xiaodan W.,Beijing Institute of Aeronautical Meteorology | Zhong Z.,PLA University of Science and Technology | Zhong Z.,CAS Institute of Atmospheric Physics | And 2 more authors.
Theoretical and Applied Climatology | Year: 2012

The propagation characteristic of atmospheric responses to the abnormal warm sea-surface temperature (SST) in the Kuroshio Extension in winter was investigated using National Centre for Atmospheric Research CAM3. 0. The results show that geopotential height perturbations at 500 hPa occupy much of the mid and high-latitude areas north of 20°N and are stronger in winter and spring than in summer. Power spectrum analysis reveals that the perturbations contain both quasi-biweekly and intraseasonal oscillations. In the latitude band with maximum perturbation amplitude, the oscillations propagate mainly eastward. The centers of dominant oscillations are situated in the mid and higher-latitude areas north to 40°N. The perturbations in the Arctic mainly propagate meridionally, whereas those south of the Arctic propagate zonally, at a steady-phase velocity basically. The propagation characteristics of wind perturbations and temperature perturbations are similar to those of geopotential height perturbations. © 2011 Springer-Verlag.

Song P.,PLA University of Science and Technology | Song P.,Beijing Institute of Aeronautical Meteorology | Zhu J.,CAS Institute of Atmospheric Physics | Zhong Z.,PLA University of Science and Technology | And 2 more authors.
Advances in Atmospheric Sciences | Year: 2016

This study examines the impact of atmospheric and oceanic conditions during May–August of 2004 and 2010 on the frequency and genesis location of tropical cyclones over the western North Pacific. Using the WRF model, four numerical experiments were carried out based on different atmospheric conditions and SST forcing. The numerical experiments indicated that changes in atmospheric and oceanic conditions greatly affect tropical cyclone activity, and the roles of atmospheric conditions are slightly greater than oceanic conditions. Specifically, the total number of tropical cyclones was found to be mostly affected by atmospheric conditions, while the distribution of tropical cyclone genesis locations was mainly related to oceanic conditions, especially the distribution of SST. In 2010, a warmer SST occurred west of 140°E, with a colder SST east of 140°E. On the one hand, the easterly flow was enhanced through the effect of the increase in the zonal SST gradient. The strengthened easterly flow led to an anomalous boundary layer divergence over the region to the east of 140°E, which suppressed the formation of tropical cyclones over this region. On the other hand, the colder SST over the region to the east of 140°E led to a colder low-level air temperature, which resulted in decreased CAPE and static instability energy. The decrease in thermodynamic energy restricted the generation of tropical cyclones over the same region. © 2016, Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg.

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