** Progress in Earth and Planetary Science is the official journal of the Japan Geoscience Union, published in collaboration with its 50 society members.

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    Atmospheric and hydrospheric sciences

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    Climate-relevant properties of black carbon aerosols revealed by in situ measurements: a review

    Nobuhiro Moteki

    Atmospheric chemistry, Atmospheric radiation, Climate, Aerosol, Light-absorbing aerosols, Black carbon

    Figure 1. Roles and relationships of the four-different approaches in aerosol-climate research. Laboratory analyses of collected samples, in-situ measurements, and remote sensing provide complementary observational information needed for reducing assumptions in the atmospheric chemical transport model (sub-module of the climate model).

    Light-absorbing aerosols affect atmospheric radiation, dynamics, and precipitations through shortwave absorption in the atmosphere and snowpack. Black carbon (BC) is considered the most significant contributor to global shortwave absorption among all the known light-absorbing aerosol components. In analyses and predictions of BC’s lifecycle and climate effects, multiscale field observations are needed to test the fundamental assumptions in the climate model. In situ measurements, the focus of this review, fill the gap of observational information accessible from remote sensing and laboratory analyses. This article reviews historical backgrounds, recent advances in in situ measurements of BC, and the resulting observational findings used to update the assumptions in climate models and remote sensing. Finally, we raise open problems that demand a rethinking and future investigation.

    Illustrating the physical principle of detecting the light-absorbing black carbon and iron oxidesaerosol particles using the single-particle laser-induced incandescence