特色活动 | Geoinsider在线讲座系列第17期：利用太阳诱导叶绿素荧光遥感提高对秋季碳循环的认识

活动简介

Geoinsider Webinar

在线讲座系列第17期

题    目：

Using solar induced fluorescence to improve understanding of autumn carbon cycle, Nature Climate Change & PNAS paper

报告人：Dr. Yao Zhang, UC Berkeley

时    间：

北京时间 4月24日（周五）上午10:00

加州时间 4月23号（周四）晚上19:00

悉尼时间 4月24号（周五）中午12:00

参与方式：采用Zoom平台，点击文末阅读原文进入平台参会。

链    接：https://tamu.zoom.us/j/95246134015

 Presentation Abstract 

Over the past decades, optical remote sensing and the satellite retrieved chlorophyll fluorescence (SIF) have been widely used to estimate gross primary production at a global scale. However, both methods have their strengths and weaknesses. In this talk, I use a machine learning method and generate a new dataset that takes advantage of both optical remote sensing and satellite SIF retrievals. Using two case studies, I will show how this new dataset in combination with observations from eddy covariance (EC) flux tower and simulations from Earth system models (ESMs) can help us better understand the ecosystem carbon dynamics in late growing season. In the first study, I use an analytical framework and quantify the light limitation at northern high latitude for both spring and autumn. Combined with EC data, I show that regions with stronger/weaker light limitation will release/fix more carbon with autumn warming. This result reconciles the contradictory reports on the autumn warming effects on ecosystem carbon uptake by previous studies. In the second study, I explore the environmental limitation of late season photosynthesis at a global scale. I found contrasting spatial patterns of water and temperature limitation, the threshold to separate these regions are determined by mean annual temperature and pre-season soil moisture. Considering higher MAT predicted by ESMs, water limited area is projected to increase and cause stronger variations to the late season photosynthesis.

Linkage：

https://www.pnas.org/content/early/2020/04/08/1914436117

Geoinsider简介 

Geoinsider是一个最初由湾区的Geoscience同行自发形成的公益性交流平台，定位在顶级的产学研交叉，包括PNS级讲座、产业应用转化、留学Intern教职申请等交流，迄今已邀请发表过Science、Nature等高水平文章，以及来自Harvard、Berkeley等顶级机构的Webinar报告交流。

往期报告

致    谢

本活动由Geoinsider主办，得到全国地理学研究生联合会、北京师范大学地理科学学部GEO云讲堂、信达雅科教、环宇易研科技等单位的大力支持。

温馨提示：

• 讲座采用Zoom平台，请提前下载调试

• 登录Zoom的个人备注需用中文或英文全名

• 讲座结束后预留了交流时间，欢迎各位同行前来交流讨论

欢迎大家积极参加！

 活动简介

Geoinsider Webinar

在线讲座系列第17期

-THE END-

文稿来源：Yelu Zeng

图文排版：田可

责任编辑：乔智

审编：王波涛  常贵蒋

终审： 顾伟男   田巍   梁龙武

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