\setcounter{figure}{0} %设置编号
\begin{appendix} %插入appendix环境，此处似乎用\appendix也行
\renewcommand{\thefigure}{A\arabic{figure}}
\section{Supplementary material}
\begin{figure}[htpb]
\centering
\includegraphics[width=0.6\linewidth]{gg_insitu_light}
\caption{Variation of light intensity at different
depth (light intensity in \si{\lunit}).}
\label{fig:lightdepth}
\end{figure}
\end{appendix}
参考：
https://tex.stackexchange.com/questions/85776/change-figure-numbering-for-appendix
https://zhuanlan.zhihu.com/p/37875669
http://lg-zhou.blog.163.com/blog/static/178068920118243754271/
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