Global haze aerosol distribution: a direct view by Geofen-5 satellite with 3.3 km spatial resolution

TL;DR

This paper presents the first high-resolution global map of aerosol optical depth using the Chinese GaoFen-5 satellite's Directional Polarization Camera, enabling detailed observation of haze and air pollution distribution.

Contribution

It introduces a novel 3.3 km resolution aerosol dataset from the DPC sensor, providing unprecedented detail for global haze and pollutant analysis.

Findings

First high-resolution global AODf map at 3.3 km resolution

Dataset reflects spatial distribution of major air pollutants

Enables detailed analysis of global haze patterns

Abstract

The Directional Polarimetric Camera (DPC) is the first Chinese multi-angle polarized earth observation satellite sensor, which has been launched onboard the GaoFen-5 Satellite in Chinese High-resolution Earth Observation Program. GaoFen-5 runs in a sun-synchronous orbit with the 2-days revisiting period. DPC employed a charge coupled device detection unit, and can realize spatial resolution of 3.3 km under a swath width of 1850 km. Moreover, DPC has 3 polarized channels together with 5 non-polarized bands, and is able to obtain at least 9 viewing angles by continuously capturing series images over the same target on orbit. Based on the Directional Polarization Camera (DPC) onboard GF-5 satellite, the first global high-resolution (3.3 km) map of fine-mode aerosol optical depth (AODf) over land has been obtained together by Aerospace Information Institute, Chinese Academy of Sciences, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (the manufacturer of DPC sensor) and other institutes. This AODf remote sensing observation dataset has the highest spatial resolution in the world. It can reflect the spatial information of major air pollutants (PM2.5, etc.) and provide critical basic products for "decryption" of global haze distribution.